SNAP Analog Input Modules

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Thermocouple/Millivolt Input Module

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.