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Linearizes Thermocouple and RTD signals

• Reduces the demands on the software to linearize the signal
• Produces a voltage or current that is directly usable by a display device


Provides sensor excitation for RTDs, strain gages and transmitters
• Simplifies system design and reduces parts and cost
• Increases reliability


Eliminates ground loops
• More accurate data acquisition
• Shortens system start up time


Isolates the field from the computer
• Protects operators
• Protects the data acquisition hardware and the computer
• Minimizes errors caused by common mode voltage


Amplifies the low level sensor signal outside of the electrically noisy computer chassis
• Minimizes or eliminates errors caused by electro-magnetic interference


Provides over-voltage protection
• Protects equipment and personnel from improper wiring, power surges and other faults


Provides convenient screw terminals for field wiring

• Simplifies installation
• Reduces troubleshooting and repair time


Filters out unwanted noise
• Reduces noise from AC power lines, florescent lights, motors, etc.


Mixes and matches many sensor types on one back-plane
• Minimizes initial outlay
• Facilitates future expansion


Customizes the full range of the module to match the sensor signal range
• Maximizes the resolution and accuracy of the reading over small signal spans

1781-7B Series Input and Output Modules General Information:

The 1781-7B Series represents Western Reserve Controls ongoing commitment to provide cost-effective, isolation-based signal conditioning solutions for the process control industries. The 1781-7B Series is a family of modular, single-channel, plug-in signal conditioning modules that accept inputs from a wide range of process control transducers and signals while providing high-level output voltages or process control currents.

Performance Optimized for Process Control

Featuring a maximum nonlinearity of ±0.02% and factory calibration that guarantees an initial accuracy specifica-tion of ±0.1%, the 1781-7B Series offers superior performance at a lower cost than existing multipurpose signal condi-tioners or in-house designs. Other family features include 160 dB of common-mode rejection, 60 dB of normal-mode rejection, up to 1500 V rms of isolation, and 120 V rms of field wiring protection. Short circuit and input overvoltage pro-tection are built-in and the proprietary isolation transformer circuit design of the 1781-7B Series provides for true channel-to-channel isolation.

CE Approval

European CE approvals EMC directive compliant. Low voltage directive is not applicable. Products comply with ENG1010-1 (IEC1010.)

Rated to Operate in the Industrial Environment

All 1781-7B Series modules are packaged in compact, rugged, 2.1" x 1.7" x 0.6" (54 mm x 42 mm x 14 mm) plastic cases that readily accommodate high channel density applications. The modules are rated over the extended -40°C to +85°C industrial temperature range; and they may be operated in noncondensing, high humidity environments. 1781-7B Series modules can be removed and/or inserted into the backplane without damage to the modules when the power supplies are energized.

Unregulated 24 V dc Linear Power Supplies

The 1781-7B Series is rated for a nominal power supply input of +24 V dc; and, for maximum flexibility, it will accept supply voltages in the +14 V dc to +35 V dc range. Consequently, system perfor-mance will not degrade with the use of unregulated supplies. Linear supplies are recommended for better noise rejection. Redundant power supply configurations are available.

Hardware

The 1781-7B Series is complemented by a full line of backplanes (1, 4-, 8-, 16-channel) and rackmount hardware. Each backplane contains screw terminals for field wiring connections, and a miniature cold junction compensation thermistor is installed under the screw terminal blocks for each channel. The 1781-7B Series’ simplified pinout ensures that this thermistor compensates the input signals for the thermocouple modules only. Consequently, any module type may be used in any channel on the backplane.