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