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$495.00 (USA and Canada only)

Availability: Call for Availability

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


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), CE, ATEX(Category 3, Zone 2), RoHS, DFARS



groov Thermistor Resistor Input Module Data Sheet

The groov analog input module is part of Opto 22's groov EPIC® System. This document includes descriptions, specifications, and wiring and dimensional diagrams for most analog current input modules.

Declaration of Conformity (GRV-EPIC)

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.

CAD Drawing: groov I/O Module

This ZIP file includes drawings that apply to all groov I/O modules. There are two drawings:

  • One drawing that shows the module cover in the lower position.
  • One drawing that shows the module cover in the higher position.

No videos or demos are available for this product.