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Standards Specifications (2)
Input isolator Input isolator card
Name card (1 to 5 V (with square root 2-wire transmitter input card (*2)
input) extraction)
Model EH1 EH5 EA1 EA2 EA5
Input signal 1 to 5 V DC 1 to 5 V DC 4 to 20 mA DC signal from 2-wire transmitter
(Power can be fed transmitter)
Input resistance 1 MΩ (100 kΩ when power off) 250 Ω
External input resistance – RL= (20 – minimum transmitter operating voltage)
/0.02 Ω
Allowable input voltage _30 V DC _9 V DC Allowable input current: 40 mA DC
Input linearization – Square root – Square root extraction (*1)
extraction (*1)
Transmitter power supply – 25 to 28 V DC 25.0 to 25.5 V DC
(current limit: 25 to 35 mA) (current limit: 25 to 35 mA)
Output signal 1 to 5 V DC, 2 outputs (output resistance: 1 Ω max. load resistance: 2 kΩ min.)
Signal isolation Between input and output signals, input signal and power supply input
Mounting method Mounted in special nests (connected via backboard and connector)
Wiring External wiring: Connect M4 screw terminals for I/O in the special nest
Connected I/O card: Special cable
External dimensions 73 (Width)x24 (Height)x115 (Depth) mm
Weight 70 g
Accuracy rating (*3) Within _0.1 % of the span.
However, accuracy under 2 % of EH5 and EA5 input must be in _1 % of the span.
Isolation resistance Between input and output signals, input signal and power input: at 500 V DC,100 MΩ
Between output signal and power input: at 500 V DC, 100 MΩ
Withstanding voltage Between input and output signals, input signal and power input: 1500 V AC for 1 minute
Between output signal and power input: 500 V AC for 1 minute
Power supply 24 V DC _10 %
Maximum current consumption 55 mA 50 mA 80 mA 100 mA 80 mA
Ambient conditions 0 to 50 _C /5 to 95 % RH (non-condensing)
Effect of ambient temperature change Max. _0.2 % of span for 10 _C change
Effect of power supply voltage change Max. _0.1 % of span for change of 24 V DC _10 %
*1: Relationship between input and output is as follows:
= 2 X – 1 + 1 (V), where X is input and Y is output.
*2: EA2 can be combined with intelligent transmitter BRAIN SERIES.
*3: Accuracy rating of #2 output: _0.2 % (deviation from #1 output).
Signal Conditioner Cards
Style Code Description
ET5 *C Thermocouple input card
ER5 *C Resistance thermometer sensor input card
ES1 *C Potentiometer input card
EM1 *C mV input card
EH1 *A Input isolator card (1 to 5V)
EH5 *C Input isolator card (1 to 5V with square root)
EA1 *A 2-wire transmitter input card
Model EA2 *A 2-wire transmitter input card (used with BRAIN series)
EA5 *C 2-wire transmitter input card (with square root)
EP1 *A Pulse train input card
EP3 *A Frequency input card
EC0 *A Control output isolator card
EA0 *A Output isolator card (4 to 20 mA)
EH0 *A Output isolator card (1 to 5V)
EX1 *A I/O through card
/BU Upscale burnout (*1)
Suffix Codes /BD Downscale burnout (*1)
/DF Fahrenheit display function (*2)
*1: Applied to ET5, ER5, ES1, and EM1. Can be changed using BRAIN terminals.
*2: Applied to ET5 and ER5. If “/DF” is not specified, temperature in Fahrenheit can not be indicated.
