HE670ADC840 | General Electric | Analog isolation input module

Open circuit detection time

5 seconds max. Open circuit detection is available for all configurations except +/- 20mA current, 0-20mA current, and +/-10V voltage.

Max Overvoltage

+/-14.5VDC continuous

Max Overcurrent

28 mA continuous

Normal Mode Noise Rejection

95 dB minimum @ 50/60 Hz with 8 Hz filter

85 dB minimum @ 50/60 Hz with 12 Hz filter

Common Mode Noise Rejection

120dB minimum @ 50/60 Hz with 8 Hz filter

110dB minimum @ 50/60 Hz with 12 Hz filter

Settling time to 5% of Full Scale (notch filter dependent)

<80 mS

Calibrated Accuracy at 25°C

Better than 0.1% of range (except 10 ohm CU RTD)

Accuracy depends on A/D filter, data format, input noise, and ambient temperature.

Calibration interval

12 months typical to meet accuracy specifications over time. Module will allow for user offset to be applied as a periodic calibration adjustment.

Input Offset Drift with Temperature

3.0 milliohm/°C maximum

2.0 uV/°C maximum

Gain Drift with Temperature

50 ppm/°C typical (90 ppm/°C maximum)

Module error over Full Temp range

0.5% of range typical (depends on range)

1.0% of range maximum

Module Scan Time (notch filter dependent)

(Assumes 2 ADC’s running in parallel, no CJC or lead resistance) 10 ms per Channel × 4 Channels = 40 ms  (1K Hz filter)

127 ms per Channel × 4 Channels = 508 ms (8 Hz filter)

Channels that are disabled are not scanned, shortening scan time.

Module conversion method

Sigma-delta

Isolation Voltage channel to channel

group to group

terminal block to backplane/chassis

Opto-isolated, transformer isolated

+-12.5Vdc channel to channel Tc/V/I/RTD

250 VAC continuous/1500 VAC for 60 seconds 250 VAC continuous/1500 VAC for 60 seconds