SNAP Analog Input Modules

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

© 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.

PAGE

23

Thermocouple/Millivolt Input Module

Thermocouple Polarity and Range

Type

-

+

Range

E

Red

Purple

-270°C to +1,000 °C

J

Red

White

-210°C to +1,200 °C

K

Red

Yellow

-270°C to +1,372 °C

SNAP-AITM

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 module provides two channels of analog

to digital conversion. Each channel on the module can be

configured for -150 mV DC to +150 mV DC or -75 mV DC to

+75 mV DC, or for type E, J, or K thermocouple operation.

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.

Specifications

Part Number Description

SNAP-AITM

Two-channel analog type E, J, or K thermo-

couple or -150 mV to +150 mV input or -75

mV to +75 mV input

Input Range

From -150 mV to +150 mV

From -75 mV to +75 mV

Over-Range Limits

From -165 to +165 mV

(+/-150 mV range)

From -82.5 to +82.5 mV

(+/-75 mV range)

Resolution

6 microvolts from -150 to +150 mV

3 microvolts from -75 to +75 mV

Cold Junction Temperature

Compensation

Automatic when used with

SNAP I/O processors

Input Filtering

-3 dB @ 7 Hz

Input Response Time

(% of span/delta V/delta time)

63.2%/95 mV/23 mS

Data Freshness (Max)

167 ms (+/-150 mV)

334 ms (+/-75 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

0.06% (90 microvolts) @ 150 mV

0.1% (75 microvolts) @ 75 mV

Drift: Gain Temperature

Coefficient

5 microvolts / °C

Drift: Offset Temperature

Coefficient

2 microvolts / °C

Thermocouple Accuracy [°C]

From factory

After user gain and offset

commands

± 2.0 (E, J, and K)

± 0.8

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

Torque, hold-down screws

4 in-lb (0.45 N-m)

Torque, connector screws

3 in-lb (0.34 N-m)

Agency Approvals

FM, CE, RoHS, DFARS

Warranty

Lifetime