Millivolt/Voltage Two Wire Transmitters, Devar Model - SM811
Millivolt/Voltage Two Wire Transmitters, Devar Model - SM811

Devar SM811 Thermocouple Transmitter with Field Selectable Ranges

Regular price $152.00 $145.00 Sale

  • Ranges Selected via Dip Switches
  • 0.1% Accuracy
  • Factory Calibrated
  • Thermo-Head Installation
  • Non-isolated
  • Ships in 1 Week for Fast and FREE Delivery

Devar's SM811 two wire transmitters accept signals from a thermocouple and provides a proportional 4 to 20 mA output signal. Because the SM811 is a two wire device, a single pair of twisted copper wires are all that is required to provide power to the unit as well as to carry the output current.

The SM811 is field calibratable, accepting inputs from type J, K, E, R, S & T thermocouples, with millivolt spans ranging from 4 to 64 millivolts.  Thermocouple types and ranges are selected using a 6 position DIP switch and final calibration is accomplished by means of multi-turn zero and span potentiometers.  The zero pot provides an offset adjustment of ± 25% of the span. The SM811 is provided with upscale thermocouple break indication. 

 

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SPECIFICATIONS

Input Ranges:

SM811-MV: Thermocouples J, K, T, E, R & S,  Millivolt: 4 to 64 mV
SM811-V: 0.04 to 0.64 Vdc ,0.4 to 6.4 Vdc, 4 to 64 Vdc

POWER REQUIREMENTS: 7 to 35 VDC at terminal block

ACCURACY: 0.1%

WORKING TEMPERATURE: -25°C to 85°C

STORAGE TEMPERATURE: -65°C to 125°C

THERMAL ZERO SHIFT:  0.01 %/C (span > 10 mV)
0.02 %/C (span < 10 mV)

ISOLATION: 500 VRMS

COMMON MODE REJECTION: 115 dB @ 60 Hz

3 dB FREQUENCY: 3 Hz

WEIGHT: 2.4 oz

INPUT: 0 to 60 mV dc or 0 to 10 Vdc

INPUT BREAK INDICATION: upscale

INPUT OFFSET ADJUSTMENT: +/- 25% of mV span

INPUT SOURCE CURRENT: 4 nA typical

INPUT RESISTANCE: > 3 X 107 Ohms (TC/mV version); 226 K (voltage version)

OUTPUT RANGE: 4-20 milliamps

OUTPUT LIMITS: 3 to 28 mA, typical

MAXIMUM LOAD RESISTANCE: = (supply voltage -8.5V)/20 mA

LOAD EFFECT: <.01% of span/300 Ohm change

POWER SUPPLY EFFECT: <.002% of span per volt