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$495.00 (USA and Canada only)

Availability: In stock

Analog input, temperature/thermistor or resistance, 12 channels

Production Specification

The GRV-ITR-12 module is part of the groov EPIC® system. This module has 12 channels of analog to digital conversion that convert resistance to temperature or to Ohms.

The module is ideal for NTC thermistors commonly used in HVAC, refrigeration, and process control applications. It may also be used with PTC thermistors in resistance sensing applications. The module has 12 channels of analog to digital conversion that convert resistance to temperature or to Ohms. The module reads variable resistance type transducers, with input ranges from 500 Ohms to 400 K Ohms, plus Autorange. You can also select from predefined curves for popular thermistors, as well as create custom curves.

The GRV-ITR-12 module mounts on a groov EPIC® chassis with a GRV-EPIC-PR1 processor and assorted discrete, analog, and serial groov I/O modules.







Offset and Gain



Minimum/Maximum Values



Average Filter Weight



Simple Moving Average (SMA)



Analog Totalizing



Problem indication






Input Ranges (Ohms)

400 K, 200 K, 100 K, 50 K, 40 K, 20 K, 10 K, 5 K, 4 K, 2 K, 1 K, 500 Ohms, and Autorange

Accuracy (Ohms @ Range)

400@400 K, 200@200 K, 100@100 K, 50@50 K, 40@40 K, 20@20 K, 10@10 K, 5@5 K, 4@4 K, 2@2 K, 1@1 K, 0.5@500 Ohms

Excitation Current
(Range & Load Watts Dissipated)

>7.9 µA (400 K & 25 µW), (200 K & 12.4 µW), (100 K & 6.2 µW), (50 K & 3.1 µW),
>84.7 µA (40 K & 287 µW), (20 K & 144 µW), (10 K & 72 µW), (5 K & 36 µW),
>169.2 µA (4 K & 115 µW), (2 K & 57 µW), (1 K & 29 µW), (500 & 14 µW)

Data Refresh Rate

950 ms

Analog Data Filtering

-3 dB @ 2.4 Hz / -25 dB @ 60 Hz

Software Data Filtering

  • Simple Moving Average (SMA)
  • Weighted Average
  • SMA (1 to 32 readings)
  • Weighted Average (1 to 4096)

Step Response Time (to 1%)

85 ms

Problem Indication

out of range

Isolation (field-to-logic)

300 V working, 1500 V transient (1 minute)

Isolation (channel-to-channel)

300 V between channel group 0–5 & channel group 6–11. None within a group.

Number of Channels


Chassis Power Consumption

1.3 W

Minimum GRV-EPIC-PR1 Firmware Version


Minimum PAC Project Version


Minimum Library Package for CODESYS Version

Wire Size

28–14 AWG

Torque, connector screw

2.5 in-lb (0.28 N-m)

Torque, hold-down screw

3.5 in-lb (0.4 N-m)

Temperature (operating)

-20 °C to +70 °C

Temperature (storage)

-40 °C to +85 °C

Humidity (non-condensing)

5–95% RH

Agency Approvals

UL/cUL (Class 1 Div. 2)a, CE, ATEX (Category 3, Zone 2), RoHS, DFARS



a For use in hazardous locations, equipment must be mounted in an enclosure that meets the requirements of the National Electrical Code, ANSI/NFPA 70, and ANSI/ISA-61010-1 (82.02.01).

groov Thermistor Resistor Input Modules Data Sheet

groov analog input modules are part of Opto 22's groov EPIC® System. This document includes descriptions, specifications, and wiring and dimensional diagrams for groov thermistor/resistor analog input modules, part numbers GRV-IRTD-8 and GRV-ITR-12.

groov I/O Modules Firmware Readme

Readme for the latest update to the groov I/O modules. Includes information on new features, enhancements, and bug fixes.

ATEX Letter of Conformity for groov EPIC

This ATEX Letter of Conformity is provided to support CE Declaration of Conformity (GRV-EPIC and grrov RIO), form 2261.

Declaration of Conformity (groov EPIC and groov RIO)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with European, international, and/or national standards and regulations.

GRV-ITR-12 Module Firmware

This download contains current firmware for the GRV-ITR-12 module. For a list of bug fixes and enhancements included in this firmware, see the groov I/O Modules Firmware readme document.

You can obtain previous versions of the firmware by clicking on the corresponding link: 1.3c1.3a

CAD Drawing: groov I/O Module

This ZIP file includes drawings in a variety of file formats (pdf, dwg, stp) that apply to all groov I/O modules.

Note: These drawings do not apply to groov RIO modules.

No videos or demos are available for this product.