
MODEL DESIGNATION AND SPECIFICATIONS UM344-2
September 1995
8.3.4 Sensor Inputs
Common Mode Rejection .......................................120 dB at 50/60 Hz and 1000 ohm unbalanced
input
Normal Mode Rejection .........................................6 dB at 2 Hz and 60 dB at 50/60 Hz
Input Overvoltage Protection ..................................+/-30 Vdc
Digital Filter Range ................................................0.001 to 10Hz (breakpoint frequency) selectable
Thermocouple (TC)
Reference Junction Compensation ....................Automatic
Input Impedance ..............................................Greater than 200,000 Ohms
Thermocouple Burnout Scale Direction .............HART selectable (UP/DOWN)
Conformity ......................................................Greater than or equal to 0.1°F; NIST curve
based on IPTS - 1968
Millivolt (mV)
Input Impedance ..............................................Greater than 1 Megohm
Resistance Temperature Detector (RTD)
Input Impedance ..............................................Greater than 1 Megohm
Resistance (Potentiometer)
Input Impedance .............................................Greater than 1 Megohm
8.3.5 Environmental
Ambient Temperature Range, Storage & Operating
Operating ..............................................................-40° to 85°C (-40° to 185°F)
Storage .................................................................-40° to 85°C (-40° to 185°F)
Humidity
Operating ..............................................................5-100% RH
Storage .................................................................0-100% RH, non-condensing
Maximum Moisture
Operating ..............................................................Less than 0.050 lb. H
2
O per lb. of dry air
Storage . ................................................................Less than 0.028 lb. H
2
O per lb. of dry air
Corrosive Atmosphere .................................................Operates in Class G3 (Harsh) environment per
ISA-S71.04
Vibration Effect ...........................................................Less than ±0.05% URL per G from 0 to 2000
Hz in any axis (per SAMA PNC 31.1) up to 7Gs max
EMI Susceptibility ........................................................Tested for RFI from 30 MHz to 1 GHz for a
field of 30V/m
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