© 2001–2014 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Specifications
Part Number Description
SNAP-AITM-2
Two-channel analog type B, C, D, G, N, T, R, or S
thermocouple or -50 mV to +50 mVDC input
or -25 mV to +25 mVDC input
Input Range
From -50 mV to +50 mVDC
From -25 mV to +25 mVDC
Over-range Limits
From -55 to +55 mV
(+/-50 mV range)
From -27.5 to +27.5 mV
(+/-25 mV range)
Resolution
2 microvolts from -50 mV to +50 mV
1 microvolts from -25 mV to +25 mV
Cold Junction Temperature
Compensation
Automatic when used with SNAP
brains
Input Filtering -3 dB @ 2.4 Hz
Input Response Time
(% of span/delta V/delta
time)
63.2%/31.5 mV/66 ms
Data Freshness (Max)
167 ms (+/- 50 mV)
334 ms (+/- 25 mV)
DC Common Mode Rejection >-120 dB
AC Common Mode Rejection >-120 dB @ 60 Hz
Maximum Survivable Input ±15 volts
Maximum Operating Com-
mon Mode Voltage
250 V
Accuracy at Full Scale
0.1% (50 microvolts) @ 50 mV
0.2% (50 microvolts) @ 25 mV
Drift: Gain Temperature
Coefficient
5 microvolts / °C
Drift: Offset Temperature
Coefficient
2 microvolts / °C
Thermocouple Accuracy [°C] B, R, S C, D, G T, N
From factory ±5 ±4 ±3
After user gain and offset
commands
±3 ±2 ±2
Isolation 1500 V
Power Requirements 5 VDC (±0.15 ) @ 170 mA
Input Resistance 100 Megohms (each channel)
Ambient Temperature:
Operating
Storage
0 °C to 70 °C
-40 °C to 85 °C
Agency Approvals FM, CE, RoHS, DFARS
Torque, hold-down screws 4 in-lb (0.45 N-m)
Torque, connector screws 3 in-lb (0.34 N-m)
Warranty Lifetime
Thermocouple Polarity and Range
Type - + Range
B RED GRAY +42° C to +1,820 °C
C, D, G RED WHITE 0° C to +2,320 °C
N RED ORANGE -270° C to +1,300 °C
R, S RED BLACK -50° C to +1,768 °C
T RED BLUE -270° C to +400 °C
SNAP-AITM-2
IMPORTANT: The mounting rack connector has 24 pins; the
module connector has 20 pins. The extra pins on the
mounting rack connector prevent misalignment of the
module during installation.
Description
The SNAP-AITM-2 module provides an input range of ±50
mV, ±25 mV, or Type B, C, D, G, N, T, R, or S thermocouple.
Since both inputs share the same reference terminal, use
isolated probes for thermocouple inputs. If you need
isolated channels on the same module, see Opto 22 form
#1182.
