Hardware reference guide

Intrinsically Safe Modules
404
35013379 11/2011
Input Filter Single low pass @ nominal 20 Hz. Plus notch filter
at 50/60 Hz
Normal Noise Rejection 120 dB min @ 50 or 60 Hz
Cold Junction Compensation (CJC) Internal CJC operates 0 ... 60° C (errors are
included in the accuracy specification). The
connector door must be closed. Remote CJC can
be implemented by connecting the TC (which
monitors the external junction block temperature)
to channel 1. Types J, K, and T are recommended
for best accuracy.
Programming Software Modsoft Ver. 2.61or higher
Resolution
TC Ranges Choice of: 1° C (Default) 0.1° C 1° F 0.1° F
Millivolt Ranges +/- 100 mV range, 3.05 μV (16 bits)
+/- 25 mV range, 0.76 μV (16 bits)
TC Absolute Accuracy (see Note 1)
Types J, K, E, T (see Note 2) +/- 2° C +/- 0.1% of reading
Types S, R, B (see Note 3) +/- 4° C +/- 0.1% of reading
Millivolt Absolute Accuracy
@ 25° C +/- 20 μV +/- 0.1% of reading
Accuracy Drift w/ Temperature 0.15 μV/°C + 0.0015% of reading/° C max.
Isolation
Channel to Channel
Channel to Bus
None
1780 Vac @ 47-63 Hz or 2500 Vdc for 1 min.
Update Time 1 sec. (all channels)
Fault Detection Out of range or broken wire
Bus Current Required 400 mA
Power Dissipation 2 W
External Power Not required for this module
Hot Swap Not allowed per intrinsic safety standards
Fusing Internal - not user accessible
Programming Software Modsoft Ver. 2.6 or higher or Concept Ver. 2.2 or
higher
Notes:
1. Absolute accuracy includes all errors from the internal CJC, TC curvature, offset plus gain,
for module temperature of 0 ... 60° C. User-supplied TC errors not included.
2. For type J and K, add 1.5° C inaccuracy for temperatures below -100° C.
3. Type B cannot be used below 130° C.
4. All TC ranges have an open TC detect and upscale output. This results in a reading 7FFFh
or 32767 decimal when an open TC is detected.
Thermocouple/Millivolt Module Specifications