Granite Temp 120 20-Channel Thermocouple Module
Better Temperature Measurements
With dedicated reference temperatures
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications


The Granite™ Temp 120 is a purpose-built thermocouple measurement module. It has 20 thermocouple inputs using universal-alloy miniature thermocouple jacks. The Temp 120 is made to handle extreme temperature environments and rapid thermal gradients applied to the measurement module. It has a dedicated temperature reference for every input terminal and is carefully designed to reduce temperature errors in the presence of external temperature gradients.

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Benefits and Features

  • Universal-type standard miniature thermocouple connectors
  • Cold-junction reference temperatures on every channel
  • Exceptional accuracy and temperature stability
  • CPI DAQ connection for channel expansion
  • CAN bus 2.0 A/B output available
  • USB 2.0 interface for PC-based operation


Detailed Description

The inputs of the Temp 120 are a universal copper-copper junction and can accept any standard thermocouple alloy type. The Temp 120 is part of a data-acquisition system that includes a DAQ such as a Granite 6, 9, or 10, or the CR6 or CR1000X Dataloggers. The clock timing synchronization across modules is managed by the DAQ or data logger via the CPI communication port. The time base can be referenced either to GPS or a temperature-compensated real-time clock. Applications requiring hundreds of terminals of thermocouples can be easily assembled as a single data-acquisition system. Measurement modules can be collocated or spread out via a networking cable to be closer to the point of measurement.


Operating Temperature Range
  • -40° to +70°C (standard)
  • -55° to +85°C (extended)
Terminals 20 channels: universal (copper/copper), miniature socket connectors
Supported Thermocouple Types B, E, J, K, N, R, S, T
Resolution 0.015°C
  • 10 Hz when filtering is disabled (maximum measurement rate for all 20 channels)
  • 1 Hz when filtering is enabled (maximum measurement rate for all 20 channels)
Input Limits 0.25 to 3.0 Vdc (built-in 1.65 Vdc bias voltage)
Maximum Input Voltage ±10 Vdc
DC Common-Mode Rejection ≥ 115 dB
Normal Mode Rejection > 80 dB (at 50 and 60 Hz)
Internal Cold Junction Accuracy
  • ±0.05°C typical (20° to 40°C)
  • ±0.28°C maximum (-40° to +70°C) for -SD option
  • ±0.36°C maximum (-55° to +85°C) for -XD option
Total Measurement Accuracy in Static Temperature Environment
  • ±0.4°C typical (20° to 40°C)
  • ±0.8°C maximum (-40° to +70°C) for -SD option
  • ±1.0°C maximum (-55° to +85°C) for -XD option
Total Measurement Accuracy for Rapid Temperature Environment Ramps ±3°C maximum (8°C per minute ambient gradient)
Dimensions 21.5 x 10.8 x 5.1 cm (8.5 x 4.25 x 2 in.)
Weight 0.9 kg (1.95 lb)

Measurement Performance Verification and Calibration

-SD Option Performance is based on engineering design and verified in a laboratory environment.
-XD Option Performance is based on engineering design and verified over the full temperature range of the product and includes a Certificate of Calibration and Instrument Data Report.


CPI RJ45 interface to Campbell Scientific data loggers and CDM measurement peripherals and sensors
USB USB micro-B device only, 2.0 full-speed 12 Mbps, for computer connection


Processor Renesas RX63N (32-bit with hardware FPU, running at 96 MHz)
Memory 2 MB SRAM
A/D Converter 24-bit sigma-delta

Power Requirements

Voltage 9.6 to 32 Vdc
Typical Current Drain
  • 5 mA (sleep)
  • 30 mA (active)


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
CR1000X Requires OS version 4 or greater.
CR6 Requires OS version 10 or greater.

Distributed Data Acquisition

Product Compatible Note
Granite 10 Requires OS version 1 or greater.
Granite 6 Requires OS version 1 or greater.
Granite 9 Requires OS version 1 or greater.

Additional Compatibility Information

The Temp 120 is compatible with CPI-enabled data loggers only.


Granite Temp 120 Operating System v.3.01 (627 KB) 05-04-2021

Current Granite Temp 120 Operating System. Requires the Device Configuration Utility and a USB micro cable. 

View Update History

Frequently Asked Questions

Number of FAQs related to Granite Temp 120: 5

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  1. Only the XD versions (not the SD) support CANOut 2.0b. To enable this function, use our SURVEYOR software. When SURVEYOR recognizes an XD module, a CAN Enable menu appears with a “CAN Enabled” slider switch.

  2. Yes, a specific CAN ID can be selected for each module.

  3. The Volt 108/116 XD and Temp 120 XD output CAN2.0b data frames in Big Endian byte format.

  4. Yes, both 11-bit and the 29-bit (extended) message identifiers are supported.

  5. All outputs except strain gauge calculated microstrain are supported in CANOut:

    • Volt SE/Diff output in mV
    • BridgeFull in mv/V
    • BrHalf3W and BrHalf4W in Rs/Rf
    • Temp 120 output in desired temperature units

    Note: Strain values are in mV/V and either need a data logger or post processing to calculate microstrain.

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