Help with Level Transmitters specifications:
Device Type
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| Media Type: | |||
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| Liquid | Devices measure liquids. | ||
| Dry Material (Bulk Solids and Powders) | Devices measure dry materials, including powders and bulk solids. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Level Measurement Type: | |||
| Your choices are... | |||
| Continuous Level | Devices measure levels within a given range. The output provides a continuous reading of the level. | ||
| Point Level / Multi-Point Levels | Devices mark a specific level and are generally used as a high alarm or switch. Multiple-point sensors can also be integrated in one device to add a low alarm, or to serve as a stepped version of a continuous level. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Output Options
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| Output Options: | |||
| Your choices are... | |||
| Analog Voltage Signal | The output is an analog voltage signal. | ||
| Analog Current Signal (e.g., 4-20 mA) | The output is an analog current signal (transmitter) such as 4-20 mA. | ||
| Frequency / Modulated Frequency | The output is a frequency or modulated frequency (e.g., sine wave, pulse train, AM, FM). | ||
| Alarm / Visual Indicator | The output is an audible alarm or visual indicator. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Operating Specifications
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| Measuring Range | The level range that devices can measure. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Maximum Operating Pressure | The maximum operating pressure for which devices are rated. | ||
| Search Logic: | All matching products will have a value greater than or equal to the specified value. | ||
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| Material Temperature Range | The maximum material temperature for which devices are rated. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Field Adjustable? | Different ranges can be selected while devices are in the field. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Meter Technology
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| Meter Technology: | |||
| Your choices are... | |||
| Air Bubbler | Air bubblers feed a gas (usually air) at constant volumetric rate through a bubble tube submerged in a liquid. The amount of pressure needed to force the bubble from the bottom of the tube is equal to the hydrostatic pressure at that point. | ||
| Capacitive / RF Admittance | Capacitive or RF admittance devices use a radio frequency (RF) technique that is based on differing dielectric constants. The impedance from the RF signals changes whenever the material approaches the sensing region. | ||
| Differential Pressure Sensors | Differential pressure sensors measure head pressure in a vessel based on the height of the media. | ||
| Electrical Conductivity or Resistance | Electrical conductivity or resistance-based devices use a low-voltage power source applied across separate electrodes. A conductive liquid which contacts both probes completes a conductive circuit. | ||
| Mechanical / Magnetic Floats | Mechanical devices or magnetic floats use sealed reed switches in a stem with a permanent magnet installed in the float. As the float rises or falls, the switch is activated. | ||
| Optical | Optical devices use optic sensors and the principle of optical reflection to detect the presence or absence of fluid. Typically, light emitting diodes (LEDs) are used as the light source. | ||
| Pressure Membrane | Pressure membrane meters have a pressure-sensitive switch. They transmit pressure to an internal sensor via an organic or thin-metal membrane. | ||
| Radar / Microwave | Radar or microwave devices send a microwave pulse toward the process material. The pulse is reflected back by the material's surface and detected by the receiver. The level is inferred from the time of flight. | ||
| Radio Frequency | Radio frequency (RF) devices emit a high-frequency/low-power radio signal from a probe. When the material contacts the probe, the bridge becomes unbalanced and a comparing circuit realizes the change. This causes a relay output to change state. | ||
| Rotation Paddle | Rotation paddles are small electric motors that drive a paddle which rotates freely in the absence of material. When the paddle is impeded by material, the motor senses this and typically triggers a switch. | ||
| Ultrasonic / Sonic | Ultrasonic or sonic devices measure the length of time it takes for a reflected sound wave to return to a transducer. Transmitted time is proportional to level. | ||
| Vibrating / Tuning Fork Method | Tuning forks use various technologies (typically piezoelectric) to vibrate a probe and then constantly monitor the presence or absence of that vibration. | ||
| Other | Other unlisted, specialized, or proprietary meter technologies. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Mounting Options
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| Mounting Options: | |||
| Your choices are... | |||
| Side Mount | The device mounts on the side of the vessel which contains the media to measure. | ||
| Top Mount | The device mounts on top of the vessel which contains the media to measure. | ||
| Bottom Mount | The device mounts at the bottom of the vessel which contains the media to measure. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Communication Interface Options
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| Communication Interface Options: | |||
| Your choices are... | |||
| Serial Interface | Serial interfaces use a serial communication protocol such as universal serial bus (USB), RS232, or RS485. | ||
| Parallel Interface | Parallel interfaces use a parallel communication protocol such as general-purpose interface bus (GPIB). | ||
| Other | Devices use other, unlisted communication interfaces (e.g., modems, RF transmitters). | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Instrument Options
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| Instrument Display Options: | |||
| Your choices are... | |||
| Non-Electrical Visual or Audio Output | The display has a non-electrical visual indicator such as simple float, or an audible click. | ||
| Analog Meter or Indicator | The display has an analog meter (typically with a needle), or uses LED indicators. | ||
| Digital Readouts | The device displays numerical or application-specific readouts. | ||
| Video Display Terminal (VDT) | Video display terminals (VDT) include cathode ray tubes (CRT) and flat panel displays (FPD). | ||
| Search Logic: | Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Features
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| Features | |||
| Your choices are... | |||
| Rated for Sanitary Applications | Devices are rated for sanitary applications such as those found in the pharmaceutical and food processing industries. | ||
| Handles Slurries / Suspended Solids | Devices can handle slurries or suspended solids such as sewage and wastewater. | ||
| Submersible | The device is meant to be submerged during operation. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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