The AP4151-2000 is a wide-ranging, isolating signal conditioner for RTD inputs. The input is configured for a 3-wire RTD. (A 2-wire RTD can be used, by jumpering together terminals 4 and 5 on the mounting base.) The RTD types supported are Platinum, Nickel and Copper. Push button ranging is used for adjusting the input and output ranges.

The new model AP4151-2000 is really a single unit replacing two older models with many specific dash numbers, the AP4001 and the AP4151. The unit is selectable for an output that is either linear to resistance or linear to temperature.

Daytronic's large family of high-performance conditioner cards accommodates virtually every type of transducer input. Designed for use in System 10, SPS6000, and/or SPS8000, each card provides an I/O Connector accessible at the rear of the unit, for quick and easy attachment of transducer cables.

Yielding exceptional measurement stability and accuracy, these single- and multichannel plug-in cards feature the proven reliability of true analog signal conditioning, with

• separate amplifier for each input channel, with gain/noise/drift characteristics optimized for each specific input type

• remotely sensed excitation, allowing accurate calibration with long cable runs

• powerful low-pass active filtering on an individual-channel basis (precise channel-by-channel tailoring of analog filtering is especially important when it comes to the elimination of aliasing errors)

• precise control of internal reference voltages

• precise built-in calibration and excellent interchangeability of cards

• premium low-drift components

There are conditioner cards for

• Thermocouples • Thermistors • Platinum RTD's • LVDT's and variable reluctance transducers • Incremental Encoders • Pickups and other frequency-generating transducers • DC/AC voltage sources • DC/AC current sources, including 4-20 mA process signals • DC- or AC-excited strain gage transducers and configurations • Amplified piezoelectric accelerometers

The Automation Systems Interconnect, Inc, ASI, offers a broad range of signal converters, signal conditioners, signal isolators, frequency converters and signal alarm modules. These compact din rail mounted signal conditioners are available for use with RTD's and thermocouples. The signal conditioners are dip-switch programmable or PC programmable for use with analog and digital circuits in any of hundreds of levels. All ASI signal conditioners use a space saving design, mount to standard din rail and in most cases pluggable terminal blocks are used to make installation easy. The frequency conversion modules convert a wide range of frequencies into an analog signal. All of the ASI signal conditioners and analog isolators come with easy to wire instructions, programming information and technical specifications.

As part of its continually expanding family of SensorLex^® 8B isolated analog signal conditioners, Dataforth Corporation of Tucson, AZ, offers the 8B34 linearized 2- or 3-wire RTD input modules, the 8B35 linearized 4-wire RTD input modules, and the 8B36 potentiometer input modules.

Each 8B34 input module isolates, filters, amplifies and linearizes a single channel of temperature input from an RTD and provides a high-level analog voltage output. These modules interface to 100 ohm platinum RTDs and can be used in any process, industrial or other, that requires precise measurement of temperature.

The 8B35 modules are also used to measure temperature, but are designed for applications requiring ultimate precision. The 8B35 uses a 4-wire measurement technique that almost completely eliminates measurement errors due to leadwire resistance. These modules are used when leadwires are extremely long or different gage wires. Like the 8B34, the 8B35 interfaces to 100 ohm platinum RTDs.

The 8B36 interfaces to potentiometers and slidewires using a 2- or 3-wire connection. Sensors with this format include tension transducers, level indicators, rotary or linear position transducers, accelerometers, and pressure transducers. The 8B36 module interfaces to potentiometers up to 10,000 ohms and provides ±0.05% measurement accuracy and ±0.02% linearity.

Download the 8B34 datasheet, the 8B35 datasheet, and the 8B36 datasheet.

Excitation for the RTD in the 8B34 modules and for the potentiometer in the 8B36 is provided from the module using two matched current sources. With a 3-wire connection, this method allows equal currents to flow through the sensor leads, canceling the effects of lead resistances. In the 8B35, RTD excitation is provided from the module using a single precision current source. Excitation currents are small in all of the modules, thereby minimizing self-heating of the sensor - a potential source of measurement error.

Other features of the 8B34, 8B35, and 8B36 include:

• High-Level Voltage Outputs
• 1500Vrms Transformer Isolation & 240Vrms Field-Side Protection
• 3-Pole Low-Pass Filtering
• Low Output Noise
• Low Drift with Ambient Temperature
• -40°C to +85°C Operating Temperature Range
• CE Compliant
• Other Agency Approvals Pending
• Mix and Match Module Types on Backpanel

Since its introduction, the SensorLex^® 8B family has grown to include 17 family groups with a total of 102 different modules. Measuring only 1.11" x 1.65" x 0.4" (28.1mm x 41.9mm x 10.2mm), the 8B signal conditioner is ideal for embedded or portable applications.

Housed in a solid, potted thermoplastic plug-in-the-panel package with a flammability rating of UL-94 V-0, the 8B family is specifically designed to protect user equipment, while reducing electrical noise and enabling convenient system expansion and repair. All 8B modules offer dimensional stability over temperature, chemical resistance, and excellent stability over time; they do not require recalibration. All models meet the requirements of EN61000-6-4 (radiated/conducted emissions) and EN61000-6-2 (ESD/RF/EFT immunity).

About Dataforth Corporation:

Dataforth was established in 1984 and is the world leader in signal conditioning, data acquisition, and data communication products for industrial applications. Worldwide, our electronic data acquisition, signal conditioning, and data communication products provide rugged signal and data integrity and wide spectrum accuracy. The Dataforth Quality Management System is ISO9001:2000 registered.

For additional information, call 800-444-7644 toll-free, email sales@dataforth.com, or visit our website at www.dataforth.com.

Dataforth Corporation of Tucson, AZ, developed the SensorLex® 8B in response to customer requests for a smaller, lower cost isolated signal conditioner. This line of isolated analog signal conditioning modules includes 17 family groups and 102 different modules that provide Instrument Class^® performance in a package 20% the size of competing modular products.

The small size is ideally suited for embedded and portable applications such as mobile test stands, COTS military and defense applications, miniaturized security and surveillance systems, embedded process controls for semiconductor manufacturing equipment and any other embedded industrial data acquisition system. The SensorLex^® 8B enables high-performance modular I/O on a per-channel basis for any embedded monitoring or measurement and control system; in addition, because the 8B provides Instrument Class^® analog output, it makes interfacing to almost any PC/104, Compact PCI, VMEbus, PXI, or proprietary data acquisition system board very easy.

Download the SensorLex® 8B datasheet.

SensorLex^® 8B modules interface to a wide variety of voltage, current, temperature, position, frequency, and strain measuring devices. Housed in a solidly potted thermoplastic plug-in-the-panel package measuring only 1.11" x 1.65" x 0.40" (28.1mm x 41.9mm x 10.2mm), the 8B's industrial enclosure provides excellent impact properties, dimensional stability over temperature, chemical resistance, and a flammability rating of UL-94 V-0.

SensorLex^® 8B Features

• ±0.05% Accuracy (typical)
• ±0.02% Linearity
• 1500Vrms Transformer Isolation & up to 240Vrms Field-Side Protection
• ANSI/IEEE C37.90.1 Transient Protection
• 5V Power (30mA typical)
• 3- to 5-Pole Low-Pass Filtering
• Low Output Noise
• -40°C to +85°C Operating Temperature Range
• CE Compliant
• Other Agency Approvals Pending

SensorLex^® 8B accessories include the 8BP01-2xx DIN rail mounting accessory. This 5VDC powered or 7VDC to 34VDC powered DIN rail mount carrier is suitable for any 8B signal conditioner and can be mounted on any standard DIN rail (EN 50022-35 and EN 50035-G32). Design-in accessories include 2-, 4-, 8-, and 16-channel standard and DIN backpanels which provide screw-terminal inputs and outputs as well as a DB25 header connector. DB25 cables are available in 1-, 2-, and 7-meter lengths. A power supply module in the same 8B form-factor is offered for input voltages of 7VDC to 34VDC and provides 5VDC output at 2A to power any combination of 8B signal conditioners.

Modules that make up the SensorLex^® 8B family include voltage and current input modules; linearized 2-, 3-, and 4-wire RTD modules; potentiometer, strain gage, and both linearized and non-linearized thermocouple input modules; current and voltage output modules with 100Hz bandwidth; voltage input modules with 1kHz and 20kHz bandwidths; frequency input modules, and 2-wire transmitter interface modules. Custom 8B modules also are available.

Signal bandwidth is 3Hz for most 8B modules except for those models specified. Output noise is as low as 250µVrms on the low bandwidth models. All modules have excellent stability over time and do not require recalibration.

Analog signals the 8B can interface to include millivolt, volt, milliamp, thermocouple, RTD, potentiometer, slidewire, strain gage, frequency, and 2-wire transmitter. Analog output modules provide a wide selection of current and voltage output ranges.

Operation and storage temperature is -40°C to +85°C, and relative humidity range is zero to 95% noncondensing. All models meet the requirements of EN61000-6-4 (radiated/conducted emissions) and EN61000-6-2 (ESD/RF/EFT immunity). For operation in hazardous environments, North American Class I, Division 2, and European Group II, Category 3, approvals are pending.

About Dataforth Corporation:

Dataforth was established in 1984 and is the world leader in signal conditioning, data acquisition, and data communication products for industrial applications. Worldwide, our electronic data acquisition, signal conditioning, and data communication products provide rugged signal and data integrity and wide spectrum accuracy. The Dataforth Quality Management System is ISO9001:2000 registered.

For additional information, call 800-444-7644 toll-free, email sales@dataforth.com, or visit our website at www.dataforth.com.

PGC's 400-700 CFM system is a durable, high quality piece of humidity/temperature conditioning equipment for scientists and engineers whose research, testing, or quality control applications require environmental simulation and control within extremely narrow tolerances.

PGC conditioners are two-temperature generators. Within the unit, a water spray temperature and a leaving air temperature are precisely controlled. A portion of the air always passes through a water spray where it is cooled to the temperature of the water and saturated. The air is then reheated to the desired dry-bulb temperature and returned to the conditioned area. The temperature of the water spray will approach the dew point of the process air. By controlling dew point temperature and dry-bulb temperature, a very constant relative humidity is maintained.

If the area to be conditioned has changing internal loads or requires make-up air, the Cascade System should be selected. This system adds a humidity sensor to the control loop that will reset the water spray temperature to compensate for load changes.

Air Flow

Air returning from the conditioned space passes through a return duct and, depending on the position of the face and by-pass damper, a portion is directed through a water spray and the balance by-passes the spray. The portion of the air subjected to the sprayed coil is cooled to within approximately 1.0ºC of the spray water temperature. This essentially saturated air passes through a mist eliminator and mixes with air that by-passed the sprayed coil. The mixed air is forced across an electric air heater by a fan. The conditioned air is then supplied, via ductwork, to the work or test area.

Air Control

A proportioning control system compares the dry-bulb temperature, measured by an RTD, to the air temperature set point. A pulsed output, which is ordinarily "on" 50% of the time when stabilized, is supplied to the air heater control circuit. A second analog output positions the by-pass damper so that the amount of air by-passed is directly proportional to the percentage of air heat applied. If the air temperature drops below the selected set point, the controller calls for more heat; i.e., the "on" time of the heater increases. The face and by-pass damper begins to compensate so that more returning air by-passes the spray coil, returning the pulsed output to the normal 50% "on" condition. Conversely, if the air temperature increases above the set point, the heater is pulsed less and more air is directed through the spray chamber.

RH Control

A platinum RTD in the water line is measured by a proportioning controller, the output of which adjusts a refrigeration capacity control valve and a water heater. Water spray temperature is controlled within ±0.1ºC.

Cascade System

The desired relative humidity is set to within ±0.1%. The proportioning controller receives an input signal from a relative humidity sensor/transmitter and, if necessary, adjust the water temperature. The output of the RH control loop is the water temperature set point. If the relative humidity drops by as little as 0.2%, the output of the RH controller will increase the water temperature set point by approximately 0.1ºC. This will, in turn, increase the relative humidity to the selected set point, returning the controller output to steady-state level.

Standard Features:

· Mechanical, conditioning, and control components come complete in one unit

· Adjustable over-temperature safety thermostat

· High quality solid state control circuit

· 316 stainless steel

· Pebbled exterior finish

· Automatic liquid-level device

· Magnetic drive chemical pump for water spray circulation

· Centrifugal fan for circulating air through conditioned area

· Low watt density heaters to ensure long life

· Low water safety cutout