Standard Analog ICTD
Module
Features
Single channel of optically-isolated current-to-digital
conversion
designed for use with an ICTD probe from Opto 22 or
from other vendors
can be used in energy management, freezer control,
and similar appllications
Standard Analog ICTD Module
Description
The AD4 module provides a single channel of opticallyisolated temperature-to-digital conversion. Modules plug into
any Opto 22 standard analog I/O rack and are secured by a
captive screw. Field connections to the module are made via
two terminals on the analog I/O rack.
The AD4 module is designed for use with an ICTD probe from
Opto 22 or from other vendors. See form 2072, the ICTD
Temperature Probes Data Sheet, for more information
Specifications
Input Temperature Range - 188.4 °C to 150 °C
Input Response Time
Accuracy of AD4
Accuracy with ICTD Probe
Resolution with ICTD Probe 0.083 °C
Power Requirements:
Module
Logic
Thermal Time Constant 2.5 minutes typical (still air)
Cable Length > 2,000 feet (610 meters)
Isolation
Input-to-Output 4,000 Vrms
Ambient Temperature
Operating
Storage
5% full scale step change in 7.8 seconds
63% full scale step change in 150 seconds
± 0.3 °C
± 0.8 °C
16 mA at +15 (+/- 0.25) VDC
11 mA at -15 (+/- 0.25) VDC
1.6 mA at 5 VDC
0 °C to 70 °C
-25 °C to 85 °C
AD4 (shown with ICTD Temperature Probe)
AD4 Connection Diagram
Part Number
Part Description
AD4 ICTD Temperature Input
© 2013 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.
Form 446-130430
PAG E
1
DATA SHEET
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