Opto 22 G4AD4 Data Sheet

G4 Analog ICTD Input

Features

Small size, rugged packaging

Optical & transformer isolation, 4000 Vrms transient

Runs on a single 24 VDC supply

Factory-calibrated, no user adjustment necessary

12-bit Resolution

Operating temperature 0° to 70° C

Description

The G4AD4 module works in conjunction with a standard
ICTD temperature probe and provides a single channel of
optically-isolated temperature-to-digital conversion.

Modules plug into an Opto 22 modular controller or an analog
I/O brick and are secured by a captive screw. Field connections
are made to the terminal strip located on the brick base or
controller I/O board.

The G4AD4 module includes complete electrical channel-to­channel isolation, which eliminates troublesome ground loop

G4 Analog ICTD Input

G4AD4

problems. The ICTD can be used in energy management,
freezer control, and similar applications.

The G4AD4 module is compatible with industry-standard
ICTDs as well as Opto 22’s ICTD temperature probes. See form
2072, the ICTD Temperature Probes Data Sheet.

NOTE: Any system using analog sensors and input modules should
be calibrated annually for analog signals. To do so, use
OptoControl commands “Calculate and Set Analog Offset” and
“Calculate and Set Analog Gain.”

Specifications

Input Temperature Range

G4AD4
ICTD Probe

Input response time

Output accuracy* ±0.8 °C
Resolution 12 bits
Thermal time constant (ICTD) 2.5 minutes typical (still air)
Cable length > 2,000 feet (610 meters)
Isolation(Transient)

Input-to-output
Input-to-analog supply

Module Ambient Temperature

Operating
Storage

*Accuracy figure requires use of gain and offset commands.

-188.4 °C to 150 °C

- 40 °C to 100 °C
5% full scale step change in 7.8 seconds

63% full scale step change in 150 seconds

4,000 Vrms
4,000 Vrms

-30 °C to 70 °C

-40 °C to 85 °C

Part Numbers

Part Description

G4AD4 ICTD Temperature Input

DATA SHEET

Form 0429-130501

© 1991–2013 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.

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Connections

G4 Analog ICTD Input

G4 Analog ICTD Input

DATA SHEET

PAG E

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Form 0429-130501

© 1991–2013 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 respecti ve companies or organizations.