Constructed entirely of 316SS, the LV-40 Single Station Level Switch is specifically designed to withstand the effects of a wide range of chemicals. The unit has a maximum operating temperature of 300F and can be used to meet many level control applications, including medical and water purification requirements. Its small float displacement permits high accuracy and reliability in shallow tanks and reservoirs. See chart on page K-4 for maximum voltage/current ratings. The LV-50 Series Level Switches offer superlative performance and dependability under the most severe operating conditions. The sensor incorporates a larger float displacement and all stainless steel construction for consistent level monitoring in liquids pressurized to a maximum 750 PSI. Ideal for level sensing in chemical plants and systems, models are available for temperatures up to 480F. To determine fluid specific gravity, add 0.1 to float specific gravity in clean liquids and 0.3 to float specific gravity in dirty or viscous liquids.

• Well Suited for Rough or Corrosive Service
• Water Purifying and Medical Application Models
• High Pressure Models up to 750 PSI
• User Selectable, Normally Open or Normally Closed SPST Switch
• Mounts Vertically at Top or Bottom of Tank

Constructed entirely of 316SS, the LV-40 Single Station Level Switch is specifically designed to withstand the effects of a wide range of chemicals. The unit has a maximum operating temperature of 300°F and can be used to meet many level control applications, including medical and water purification requirements. Its small float displacement permits high accuracy and reliability in shallow tanks and reservoirs. The LV-50 Series Level Switches offer superlative performance and dependability under the most severe opera+CI12ting conditions. The sensor incorporates a larger float displacement and all stainless steel construction for consistent level monitoring in liquids pressurized to a maximum 750 PSI. Ideal for level sensing in chemical plants and systems, models are available for temperatures up to 480°F. To determine fluid specific gravity, add 0.1 to float specific gravity in clean liquids and 0.3 to float specific gravity in dirty or viscous liquids.

SPECIFICATIONS

Stem Material: 316SS
Float Material: 316SS
Operating Temperature: -40 to 300°F; -40 to 480°F for LV-52
Pressure Rating: 150 PSI for LV-40 Series; 750 PSI for LV-50 Series
Mounting: 1 /8 NPT for LV-40; 1 /4 NPT for LV-50 Series
Switch: SPST Switch Actuation: Approx. 1 /2 the distance from end of stem to mounting, or at halfway point of float travel
Lead Wires: 22 awg. 24" Polymeric; 18 awg. 24" Polymeric for LV-50 Series
Specific Gravity of Float: LV-40: .62; LV-50: .64

The LVCN4300 Series level switches are flexible, as well as cost effective, level solutions for a great variety of applications. Rods can be encased in PTFE tubing as an option. The wide range of applications for RF level measurement switches include liquids and paste. To cater to all applications, OMEGA's capacitance probes are offered with different designs and features. Housings must also be compatible with the requirements for hazardous, wash-down, wet, and/or dusty environments. Explosion-proof environments may require the housing to be certified. In addition, the active probe might need to be intrinsically safe or have an intrinsic safety barrier. The LVCN4300 series point level switch probe works as a remote probe and is compatible with the LVCN400 series relay. This combination allows the electrode to be used in temperatures up to 177C (350F). The LVCN4300 is a very compact 316 SS switch.

Offering high reliability at low cost, the LVK-130 and LVK-140 Series level switch is recommended for many OEM applications. Extremely compact, the switch is ideal for restricted or limited space. The reed switch design allows the user to select as either normally open or normally closed by simply removing the retaining clip and inverting the position of the float. When turbulent tank conditions prevail, the LVK-150 Series level switch will provide highly stable and accurate level detection. A protective slosh shield provides a means of dampening turbulent liquids. The all polypropylene construction is ideal for beverage dispensing and ice machines. The PFA LVK-190 Series offers resistance to many corrosive materials. The sensor mounts vertically at either the top or bottom of the tank and is extremely easy to install.

OMEGA's conductivity level switches offer a wide range of customized options to meet any application's needs. They are designed to control the level of all conductive mediums, offering up to 5 different points of level control. Models are available with fixed rigid rods, with removable rigid rods, or with pendular electrodes attached to the housing with cables. These switches suit applications involving both alarm point detection and on/off pump valve control. Installation is easy and operation is maintenance-free.
The probes work through the variation of the electrical resistance between the reference electrode and the level-control electrode. Conductivity level switches detect the level resistance when their electrodes are covered by the medium.
An electrically conductive tank wall can be used as the reference electrode. If the tank is made of plastic, concrete, or any other nonconductive material, an additional electrode is required as a reference.
The LVCF switches can accommodate up to five 316 SS fixed rods for 5 different levels of control. The rods are isolated with a PTFE joggle and can be coated with PTFE when the probe is used with aggressive or sticky media that cause buildup. The user can easily modify operating levels in the tank by cutting the length of the electrodes. The LVCF switches are rugged and compact and have no moving parts. This makes them reliable for controlling conductive media as well as for high-pressure applications.

LVCP pendular probes can accommodate up to 5 model CLE-P electrodes. The LVCP probes are ideal for deep measurements in wells or large tanks where long rods would be impractical, but they work equally well for shorter-length applications. The electrodes are suspended from PVC cables that allow for longer lengths, as well as for different applications and installations. LVCP models are compatible with LVCN-200 controllers.

The LVCR models offer the same features as the LVCF, plus removable 316 SS threaded rods that make it possible to switch the rods. Rods can be ordered separately in longer length and can then be custom cut. Removable rods make the system more versatile, easier to handle, and more forgiving if the rod's length is cut incorrectly.
LVCR models are compatible with LVCN-200 Series controllers only.

Series LVC500 electronic level controls should be used whenever a liquid level needs to be maintained, such as pumping down an industrial sump, or indicated, such as a holding tank high level alarm. A system consists of three components; 1) Cut-to-length threaded electrode rods. 2) Single or multi-electrode holder. 3) Remote electronic module(s).
The LVC500 Series operates on a simple conductance principle whereby a small electrical current is passed through the conductive liquid between two electrodes or an electrode and metallic tank wall. For those applications requiring a separate start and stop point, a single control module, plus two electrodes and tank reference are required. When several applications or levels are necessary within a single tank, an electrode is needed for each level (plus tank reference), plus a multi-electrode holder and a control module for each differential or single level application.

The LV3000/LV4000 Series continuous level measurement probes are flexible, cost-effective solutions for applications involving liquids, pastes, and some solids. The built-in (one-piece) electronic module provides a 4 to 20 mA output (2-wire) signal that is proportional to the process level. Zero and span adjustment helps account for various media, tank dimensions, rod lengths, and positions of installation.
OMEGA offers these probes in several different models. The user must choose the probe that suits his or her application and install it in the proper location. When submerged, the probe must be able to produce enough capacitance variance. The probe's success depends on these important factors:
A) Conductive materials can cause a short circuit between a bare stainless steel probe and the tank wall. For this situation, we recommend using ECTFE/ETFE sleeved coatings on the rod surface.
B) Material buildup affects the accuracy of RF capacitive measurements. Additional adjustment to the probe's sensitivity is therefore recommended.
Housings must be compatible with the requirements for hazardous, washdown, wet, or dusty environments. For explosion-proof environments, the housing may need to be certified. In addition, the active probe might need to be intrinsically safe or have an intrinsic safety barrier.
The electronic circuitry of the probe performs several functions, such as rectifying and filtering the incoming power, generating the radio frequency signal, and measuring the changes in current flow.

When your application calls for a sealed tank, or the installation does not lend itself to easy removal, the LVR200 Series field-repairable continuous level switches should be considered. The entire stem and face mount can be permanently sealed to the vessel. Should replacement of the reed switches become necessary, unscrewing the top mount and removing the entire switch assembly can be accomplished without compromising the vessel's interior environment. The ability to easily remove the LVR200 series from a sealed tank allows most repairs to be completed on-site. When compared to conventional liquid level switches, this field-repairable continuous level switch eliminates the need for tank depressurization and reduces the chance of environmental contamination.

The OMEGA LVK-90 single station horizontal level switch is cost effective for level control applications in small tanks where it is more convenient to install a level switch through the sidewall of the tank. When the float arm is raised to the switch housing, the switch is activated. As the float drops away from the housing, it is deactivated. The movement of the float brings the imbedded magnet into close proximity to the encapsulated. The switch is made from Polybutylene Terephthalate and has a 20 VA rated switch.

Proven electro-optic and conductive technologies are combined to deliver advanced capabilities in the LV132 discriminating liquid sensor. Internal logic discriminates between water- and hydrocarbon-based liquids. No moving parts and solid-state switching encased in a rugged housing ensure dependable, long service.
A slim, compact form allows easy installation into interstitial areas of double-wall pipes and tanks using an integral pull ring to “snake” into place. Remove the pull ring and the LV132 installs into any tank or reservoir via 1/4 FNPT fittings for high, low, or intermediate level detection. The LV132 sensor is easy to remove, clean, and reinstall after an alarm condition is triggered, or for maintenance.
The LV132 electro-optical/ conductivity sensor contains an infrared LED and a light receiver. Continuous light from the LED is directed into a prism which forms the tip of the sensor. Two probes extend from the prism to measure conductivity.
With no liquid present, light from the LED is reflected within the prism to the receiver. When rising liquid immerses the prism, the light is refracted out into the liquid, leaving little or no light to reach the receiver. Simultaneously, the conductivity probes determine if the liquid is conductive (water-based) or non-conductive (hydrocarbon-based). Sensing the change in light intensity and measuring the liquid’s conductivity level, the receiver actuates electronic switching within the unit. A logic circuit built into the sensor housing evaluates the two inputs and gives one of three output signals: Dry, Water Present, or Hydrocarbon Present.

The LV-110 Series Drum Level Indicators are compact, self contained liquid level indicators designed for use in 55 gallon drums. A magnet equipped float senses level and readout is obtained by removing the protective cap on the unit and reading the indicator measuring tape. LV-110 units can be used in either horizontal or vertical drums.

The LVC-152-R capacitance level switch is the perfect switch solution for conductive coating or scaling type liquids. The LVC-152-R is best applied in grounded vessels which contain water based, light to medium coating or scaling type liquids including soap, wastewater and brine solutions. The LVC-152-R capacitance switch detects the presence of liquid or air by measuring the conductive or dielectric values which are present in all materials. The guard circuit rejects the negative effects of coating build-up on the probe by eliminating the coating signal path between the active and reference electrodes. As the probe tip becomes immersed in liquid, the capacitance effect is greatly increased and the switch changes state.

The LVV-110 Series unique vertical buoyancy sensors are technically the most advanced float available today. The filling baffle causes the float to be filled below the liquid surface, thereby eliminating the effects of surface tension. The self flushing design also encourages particulate matter to be purged through the baffles. The sensors are conveniently available in a reed switch.

OMEGA's ultrasonic sensors deliver accurate and reliable liquid level detection with an SPST mechanical relay output. The technology provides a high level of ultrasonic sensitivity, including resistance to vapor and turbulence. The ultrasonic sensor utilizes a fork-shaped sensor which contains two piezoelectric crystals, one of which acts as the ultrasonic transmitter, and the other as a receiver. If the air gap between the points of the fork fills with liquid, the sonic wave passes from one crystal to the other.

These liquid level switches are sealed with potting compound. The only path for liquid to the electrical switch would be through the wires. If the wires are terminated in an appropriate manner (eg. NEMA-6 connectors), the level switch will meet or exceed a NEMA-6 rating, making them suitable for submersion with years of worry free operation in moisture-laden environments. A sealed SPST switch provides consistent accuracy and high repeatability with the effects of shock, vacuum or vibration minimized. The switch is extremely versatile since it is user selectable as a normally open or normally closed by simply reversing the float or the mounting of the switch. The standard 1/2" NPT male fittings allow for quick installation in either the top or bottom of the tank or vessel.

The LV160 Series high level indicators have a 2 NPT mounting, making them ideal for use in underground and aboveground storage tanks. When mounted vertically at the tank top, the unit reliably indicates high liquid level. The unit's rugged construction and multiple design options make it adaptable for just about any environment. The indicator is available in brass or stainless steel, making it suitable for use with a wide range of liquids.
Adjustable versions are available for varying tank sizes. A special cinch nut on the mounting allows the stem to travel up or down to fine-tune actuation points. The extent of the adjustment depends on the unit's length and distance from the mounting to the highest float stop. The LV160 Series is offered in integral 1 foot lengths. For other lengths, adaptor systems are available. They consist of 2 parts: the LVR-CBR coupling (2 x 2" FNPT) and an LVR-B pipe nipple (2 x 2" MNPT) of various lengths to change the insertion depth of the sensor. When using the adaptors, retaining clip pliers are required to remove the float for installation.

These liquid level switches are sealed with potting compound. The only path for liquid to the electrical switch would be through the wires. If the wires are terminated in an appropriate manner (eg. NEMA-6 connectors), the level switch will meet or exceed a NEMA-6 rating, making them suitable for submersion with years of worry free operation in moisture-laden environments. A sealed SPST switch provides consistent accuracy and high repeatability with the effects of shock, vacuum or vibration minimized. The switch is extremely versatile since it is user selectable as a normally open or normally closed by simply reversing the float or the mounting of the switch. The standard NPT male fittings allow for quick installation in either the top or bottom of the tank or vessel.

• Low Cost, Compact Design for General Purpose Level Monitoring
• Rugged, Shock and Vibration Resistant
• Mounts Vertically at Top or Bottom of Tank
• Reed Switch Design for High Repeatability
• User Selectable, Normally Open or Normally Closed SPST Switch

The LV-10 Series level switches feature a small float displacement, especially suited for narrow or restricted areas. A standard 1/8 NPT male fitting allows for quick installation in either the top or bottom of the tank or vessel. A sealed SPST switch provides consistent accuracy and high repeatability with the effects of shock, vacuum or vibration minimized. Extremely versatile, the switch is user selectable as normally open or normally closed by simply removing the retaining clip and inverting the position of the float.

For intermediate float displacement, the LV-20 Series will yield long life and greater stability for a broad range of level monitoring requirements. The LV-30 Series larger float displacement is intended for use with liquids of high viscosity, and is well suited for harsh environments. All models share the standard features of the LV-10.

The OMEGA LVR20 and LVR30 Series continuous liquid level sensors operate on a basic voltage divider network principle. As the float rises, a magnet in the float closes a series of reed switches in sequence which varies the tapped-off portion of the voltage divider resistor network. The LVR20 has the basic voltage divider output the regulated DC voltage input equals the maximum voltage output. The LVR20 has a nominal 1,200 resistance; thus, with a 10 Vdc supply, 8.3 mA of current are required. The OMEGA DPF52 or DP24-E panel meters can be used to power and display the resistance from the LVR20; when relays are required, the DP25E-A meter can be used. For maximum accuracy, the readout device for the LVR20 should be zero and span adjusted after wiring is completed to compensate for any effects due to the resistance of the lead wires. The LVR20 can also be made intrinsically safe when used with OMEGA's intrinsic safety barriers and when properly powered. The LVR30 Series is provided with a signal conditioner to provide a 4-20 mA output when powered by 10-30 Vdc. The LVR30 Series cannot be made intrinsically safe. All LVR30 units are supplied with a J-box with screw terminal connections. All LVR20 units are supplied without a J-box with 24 inches of bare wire coming out of the top of the unit with a 1 /2 " MNPT conduit connection. All LVR20 and LVR30 Series units can be wired for increasing output with either increasing or decreasing height of liquid; standard output is increasing output with increasing height. For other lengths, adaptor systems are available. They consist of two parts: the LVR-C coupling (2 x 2" FNPT) and an LVR-A pipe nipple (2 x 2" MNPT) of various lengths to change the insertion depth of the LVR20 or LVR30 sensor. When using the adaptors, a zero offset is introduced into the output signal which must be compensated for in the readout device (for example, the mA signal will not go down to 4 mA, nor will the voltage output go down to zero). Retaining clip pliers are required to remove the float when using the adaptor system.

These liquid level switches are sealed with potting compound. The only path for liquid to the electrical switch would be through the wires. If the wires are terminated in an appropriate manner (e.g. NEMA-6 connectors), the level switch will meet or exceed a NEMA-6 rating, making them suitable for submersion with years of worry free operation in moisture-laden environments. A sealed SPST switch provides consistent accuracy and high repeatability with the effects of shock, vacuum or vibration minimized. The switch is extremely versatile since it is user selectable as a normally open or normally closed by simply reversing the float or the mounting of the switch. The standard NPT male fittings allow for quick installation in either the top or bottom of the tank or vessel.

The LVU800 Series general purpose 2-wire ultrasonic transmitter provides non-contact level measurement up to 10 m (32'), and is ideally suited for challenging ultrapure, corrosive or waste liquids. Pushbutton calibrated, the transmitter is broadly selected for atmospheric bulk storage, day tank and waste sump applications. Media examples include wastewater and sodium hydroxide.

OMEGA non-intrusive RF capacitance sensors deliver accurate and reliable liquid level detection with an SPST mechanical relay output. A versatile weld-on fitting enables the sensor to be mounted directly to the wall of any standard polyethylene, fiberglass or polypropylene tank. Simply align the fitting with the tank and press it into place. An engineered adhesive holds the fitting during welding and provides a seal between the sensor and the tank wall. OMEGA's two-step calibration feature ensures the highest level of dielectric sensitivity.

The LV170 optical liquid sensor accurately detects the presence of liquid in fiberglass double-wall tanks, containment sumps and double-wall pipes. Built-in electronic switching ensures dependability throughout its long service life. This reusable sensor easily fits small, interstitial spaces and senses liquid hydrocarbons or water. The unit is unaffected by hydrocarbon vapors, thereby greatly reducing the risk of false alarms. The LV170 sensor is easy to remove, clean and reinstall after an alarm condition is triggered, or for maintenance. The LV170 electro-optical sensor contains an infrared LED and a light receiver. Continuous light from the LED is directed into a prism which forms the tip of the sensor. With no liquid present, light from the LED is reflected within the prism to the receiver. When rising liquid immerses the prism, the light is refracted out into the liquid, leaving little or no light to reach the receiver. Sensing this change, the receiver actuates electronic switching within the unit to operate an external alarm or control circuit.

The LV600 Series unique float level switches provide an economical means of pump-up/pump-down level control with just one level switch. The ON/OFF differential is set by adjusting the length of cable over which the LV600 is allowed to float. Depending on whether the LV600 is floating with the cable UP or DOWN (see drawing), the 15 amp relay is on or off. The relay changes state when the LV600 is above or below the fixed point by 80% of the cable length. For example, if the cable is fixed for 10' (3 m) of free cable, the LV600 will trigger at 8' (2.5 m) above and below the fixed point. Thus, turbulence will generally not cause false switching. The cable can be fixed to a pipe, or the accessory counterweight can be used by slipping it over the cable (see drawing). The mechanical SPDT switch has no potentially dangerous mercury, is rated for 15A at 250 Vac, and can switch more than 100,000 times. The internal microswitch relay carries UL and CSA approvals. The case and cable are hermetically sealed by a two-step plastic injection molding process to ensure a leak-tight seal.

LV800 Series RF capacitance sensors offer cost-effective point level monitoring with reliability you can count on. Omega provides you with the most affordable solution for your application. Omega's RF switch probes are designed to provide a high level of sensitivity, stability and durability for powder and bulk solids applications, as well as liquid and slurry applications.
Principal of Operation
A radio frequency is applied to the probe and is continually analyzed to determine the influence caused by the surrounding environment. As material contacts the probe, the radio frequency shifts indicating an increase in capacitance (C). The active probe of the unit and the vessel's wall make up the two plates (A=area) of a capacitor which are separated by a fixed distance (d). The probe's insulator and surrounding air provide the dielectric material (with dielectric constant K). As the air (K=1.0) is displaced with any other material (K > 1.0), the capacitance effect (C) is enhanced, thereby changing the application's impedance. This influence is measured within the circuitry and compared to a reference established by the sensitivity setting. The setting determines how much influence must be present before the output changes. The driven shield section of the probe enables the circuitry to ignore product build-up on the probe that would otherwise cause false sensing. The driven shield is activated with the same radio frequency potential as the sensing probe. Since current can not flow between identical potentials, the driven shield blocks current flow from the active probe to the vessel wall through the material build-up, thereby eliminating the sensing of the material build-up.
Applications
LV800 Series capacitance point level sensors are versatile devices providing high and low level readings in bins, silos, tanks, hoppers, and other vessels. LV800 Series superior sensitivity range allows users to properly adjust units to meet the needs of a wide variety of applications. Whether your application is for a powder, liquid, granular solid, or viscous material, the LV800 Series product line offers the right solution.

The LVRD500 Series comprises low-cost radar sensors for continuous level measurement. This series, a logical extension to the ultrasonic sensor series, is designed for applications requiring non-contact liquid level measurement, in which ultrasonic level measurement is not acceptable.
The LVRD500 Series radar technology can be adjusted for variables such as materials to be measured, vessel configuration, and system interface. These sensors are ideal when vapor, dust, or a foaming surface prevents ultrasonic-wave measurements.
LVRD500 Series radar sensors can detect the level under a layer of light dust or airy foam, but if the dust particle size increases, or if the foam or dust gets thick, they will no longer detect the liquid level. Instead, the level of the dust or foam will be measured. Internal piping, deposits on the antenna, multiple reflections, or reflections from the wall can interfere with the proper operation of the radar sensor. Other sources of interference are rat-holing and bridging of solids, as well as angled process material surfaces that can reflect the radar beam away from the receiver.

The LV150 Series high level indicators provide a unique solution for tank overfill indication requiring self-checking. This indicator is designed with a 2" NPT mounting, making it ideal for use in underground and aboveground storage tanks. When mounted vertically at the tank top, it reliably indicates high liquid level.
To operate, simply press the brass tube fitting down to perform the self-check test. This manual operation physically moves the inner reed switch assembly while the float remains stationary (wet or dry). By doing this, the switch logic is inverted, checking the integrity of the circuitry without the need to remove the unit from the tank.
Adjustable versions are available for varying tank sizes. A special cinch nut on the mounting allows the stem to travel up or down to fine-tune actuation points. The extent of the adjustment depends on the unit's length and distance from the mounting to the highest float stop.
The LV150 Series is offered in integral one foot lengths. For other lengths, adaptor systems are available. They consist of 2 parts: the LVR-C6S coupling (2 x 2" FNPT) and an LVR-6S pipe nipple (2 x 2" MNPT) of various lengths to change the insertion depth of the sensor. When using the adaptors, retaining clip pliers are required to remove the float for installation.

The LV-1100 and 1200 level switches feature a nonmagnetic design suitable for applications where magnetic particles (i.e., rust) are present. The LV-1100 series also features rugged metal construction and a buoyancy adjustment to allow the unit to be used with fluids down to SG (specific gravity) = 0.6. The LV-1200 series features plastic and 316 SS or Hastelloy^® C construction for more corrosive applications or where the low cost of plastic construction is an advantage.

Compact, rugged and virtually maintenance free, the LVK-160 series can effectively meet the needs of large volume OEM users. The sensor is designed for side mounting into tanks that have restricted space or inaccessible tops or bottoms. Construction is polypropylene for compatibility with a wide range of chemicals. Magnetic SPST switch operation is normally open (dry) when units are installed with float downward, or normally closed (dry) when with float upward. The LVK-180 series requires side mounting into vessels and is designed to provide maximum reliability. Models are available with polypropylene float material. These versatile level sensors feature SPDT switches that can be wired as either normally open or normally closed. For high pressure applications, these switches are constructed of 316 SS.

Compact, rugged and virtually maintenance free, the LV-90 Series level switch can effectively meet the needs of large volume OEM users. The sensor is designed for side mounting into tanks that have restricted space or inaccessible tops or bottoms. Construction is all polysulfone (PSF) for compatibility with a wide range of chemicals and is suitable for food processing requirements. Magnetic SPST switch operation is normally open (dry) when units are installed with float downward, or normally closed (dry) when installed with float upward. The LV-100 Series liquid level switch requires side mounting into vessels, and is designed to provide maximum reliability. The unit should be installed in environments that are free from excessive contamination and high shock. Models are available with either Buna-N or 316SS float material, and both have positive float and cam action. These versatile level sensors feature SPDT switches that can be wired as either normally open or normally closed; other models feature SPST switches which are dedicated as either normally open or normally closed. For high pressure applications, the switches constructed of 316SS will withstand up to 900 PSI.

Offering high reliability at low cost, the LV-60 Series level switch is recommended for many OEM applications. The all polysulfone (PSF) construction provides excellent chemical resistance and is rated to a maximum 225F. Extremely compact, the switch is ideal for restricted or limited space. The reed switch design allows the user to select as either normally open or normally closed by simply removing the retaining clip and inverting the position of the float. When turbulent tank conditions prevail, the LV-70 Series level switch will provide highly stable and accurate level detection. A protective slosh shield allows contact with nonstatic, highly contaminated liquids and minimizes the effects of turbulence and motion. Mounting brackets attach to a wall, bracing, sounding tube or any convenient surface. The LV-80 Series all-CPVC construction offers resistance to many acids, bases and aqueous solutions, making these switches well suited for chemical and plating applications. The sensor mounts vertically at either the top or bottom of the tank and is extremely easy to install.

These liquid level switches are sealed with potting compound. The only path for liquid to the electrical switch would be through the wires. If the wires are terminated in an appropriate manner (eg. NEMA-6 connectors), the level switch will meet or exceed a NEMA-6 rating, making them suitable for submersion with years of worry free operation in moisture-laden environments. A sealed SPST switch provides consistent accuracy and high repeatability with the effects of shock, vacuum or vibration minimized. The switch is extremely versatile since it is user selectable as a normally open or normally closed by simply reversing the float or the mounting of the switch. The standard NPT male fittings allow for quick installation in either the top or bottom of the tank or vessel.

OMEGA's PX437, PX438 and PX439 Series submersible water level transmitters are designed to meet the rigorous environments of applications including well monitoring, pump tests, lift stations, chemical tank level, ground water and surface water measurement and process control and many others. They provide repeatable, precision depth measurements under the most adverse conditions.These transducers utilize a silicon pressure cell fitted into a stainless steel housing with an integral welded 316 stainless steel barrier diaphragm. The supplied calibration sheet specifies input and output data which reflects the unit's static accuracy and thermal characteristics. Each transducer is shipped with a moisture trap that prevents moisture from entering the vent tube. Replacement moisture traps are available as accessory items.

The three-wire ultrasonic level transmitter is the compact solution for non-contact continuous level measurement in process vessels, storage tanks and open channels. The transmitter also features a built-in 10A relay which can be configured as an alarm on a single set point or latched on two different set points for automatic fill or empty operations. Industrial and municipal liquid examples include sodium hydroxide, wastewater, resin, wax, liquor and bleach. An ultrasonic sound wave is pulsed eight times per second from the base of the transducer. The sound wave reflects against the process medium below and returns to the transducer. The microprocessor based electronics measure the time of flight between the sound generation and receipt, and translates this figure into the distance between the transmitter and process medium below.

The LTU-2000 Series Tuning Fork Sensors are point level switches that are designed to detect low or high levels of liquids. The LTU-2000 Series is based on the vibrating tuning fork principle, using piezoelectric crystals. The switch vibrates at a resonant frequency. When the tuning fork is submerged in the product, the frequency changes. This change is detected by the integrated oscillator and converted into a switching output. All models are made with 316 Stainless Steel and are available with PTFE coatings or tri-clamp fittings for sanitary applications. The LTU-2000 Series can operate in temperatures up to 120C (176F) and have a maximum working pressure of 725 PSI (50 bar).

The LVU30 Series of RoHS Compliant low-cost ultrasonic sensors that produce detection ranges from as close as 100 mm (4") to greater than 4.5 m (15'). Incorporating state-of-the-art ultrasonic technology, the sensors provide precision non-contact distance measurement for factory automation or industrial process control. The LVU30 series of sensors stand out over all other systems because of their affordability, extraordinary ease of operation, genuinely user-friendly software, versatility in usercontrolled outputs, and the ability to be set up without using a target. They transmit narrow beam sound pulses at a user-selected rate (software triggered), the process returns echoes, and various outputs depending on the position of the target and programming parameters.

The LVU40 series ultrasonic transmitters are advanced ultrasonic level measurement sensors for liquids. These products continue to meet demanding applications.
The microprocessor-based circuits provide a temperaturecompensated signal for improved accuracy. All models have the ability to filter false echoes produced by peripheral obstructions.
Continuous level measurement can be provided in a range of 0.3 to 18.3 m (1.0 to 60') with several power and programmability options. Point level can also be obtained using a PLC (Industrial Programmable Controller) or one of OMEGA's CNI process controllers.

With its compact size, the LV140 single float, liquid level sensor is ideally suited for use in steel double-wall tanks or containment sump areas. It requires no calibration, and is easy to install and maintain. When positioned vertically at the bottom of a steel tank's stand pipe or in a sump, it reliably senses the presence of a liquid. It detects hydrocarbons and water as low as 3 /4 " from the bottom of a tank or sump. The LV140 sensor features an epoxy encapsulated design providing an environmental seal, making it a fine choice for harsh environments. An integral slosh shield guards the float from debris, thereby assuring dependable service. The LV140 universal liquid level sensor operates on a direct, simple principle. A float is equipped with powerful, permanent magnets. As the float rises or lowers with liquid level, it actuates a magnetic reed switch mounted within the stem. This condition either opens or closes the electrical circuit to operate an external alarm or control circuit. When mounted vertically, this basic design provides a consistent accuracy of 1 /8 inch. At the heart of the sensor is a durable reed switch to ensure long, trouble-free service. Hermetically sealed, these switches provide precise repeatability, with actuation points that remain constant over the life of the unit. Note: The LV140 sensor is a non-voltage- producing device and does not contain energy storing components. However, since primary use is in hazardous locations, an appropriate intrinsically safe (I.S.) interface device is required for its use.