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

13

Thermistor Input Module 0–40 K, 0–20 K, 0–10 K, or 0–5 K Ohm

Specifications

SNAP-AIR40K-4

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-AIR40K-4 module provides four channels of analog

to digital conversion, ideal for thermistors used in HVAC

applications or for reading the resistance of potentiometer

input. See the table on page 3 for I/O processor compatibility.

The default input range is 0 to 40 K Ohms. The module can

also be configured for 0 to 20 K, 0 to 10 K, or 0 to 5 K Ohms.

NOTE: Resistance probes must be isolated from each other.

Part Number

Description

SNAP-AIR40K-4

Four-channel analog resistor/thermistor

input, 40 K Ohms, 20 K Ohms, 10 K Ohms,

or 5 K Ohms

Input Range

0 to 40,000 Ohms

0 to 20,000 Ohms

0 to 10,000 Ohms

0 to 5,000 Ohms

Maximum Over-Range

44 K (40 K Ohms range)

22 K (20 K Ohms range)

11 K (10 K Ohms range)

5.5 K (5 K Ohms range)

Resolution

1.6 Ohm @ 40 K Ohms

0.8 Ohm @ 20 K Ohms

0.4 Ohm @ 10 K Ohms

0.2 Ohm @ 5 K Ohms

Input Filtering

-3 dB @ 3.2 Hz

Data Freshness (Max)

100 (40 K Ohms)

200 (20 K Ohms)

400 (10 K Ohms)

800 (5 K Ohms)

DC Common Mode Rejec-

tion

>-120 dB

AC Common Mode Rejec-

tion

>-120 dB @ 60 Hz

Maximum Operating Com-

mon Mode Voltage

250 V

Accuracy

0.1% ± 40 Ohms @ 40 K Ohms

0.1% ± 20 Ohms @ 20 K Ohms

0.1% ± 10 Ohms @ 10 K Ohms

0.1% ± 5 Ohms @ 5 K Ohms

DRIFT: Gain Temperature

Coefficient

30 PPM/ °C

DRIFT: Offset Tempera-

ture Coefficient

15 PPM/ °C

Isolation

1500 V

Power Requirements

5 VDC (±0.15 ) @ 190 mA

Operating Temperature

0 °C to 70 °C

Storage Temperature

-40 °C to 85 °C

Wire size

22 to 14 AWG

Torque, hold-down screws

4 in-lb (0.45 N-m)

Torque, connector screws

5.26 in-lb (0.6 N-m)

Agency Approvals

UL, FM, CE, RoHS, DFARS

Warranty

Lifetime