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Installing the Didcom Temperature Monitoring Kit (TPM)

This article explains how to physically install the TPM kit and confirm temperature data is flowing correctly into Perspio for cold-chain visibility and compliance reporting

Overview

The Didcom Temperature Monitoring Kit (TPM) is a cold-chain monitoring solution designed to capture near real-time temperature readings using digital temperature sensors connected to a Geotab GO device.

Key capabilities include:

  • Up to 6 temperature sensors connected simultaneously

  • Temperature records log for auditability

  • Usage monitoring and compressor status

  • Optional door open/close monitoring and humidity monitoring

  • Measuring range shown in the brochure: -40°C to 29.44°C

Note: TPM operates through the GO device/IOX ecosystem (“IOX protocol ready-to-use design”).

 

Important Links:

TPM Data Sheet

Didcom TPM Product Page

If you still need the GO device installation guidance, refer to the existing Geotab GO9 installation article (separate KB article).

Prerequisites

Before installing, confirm you have:

  • A vehicle/reefer asset ready for installation (with safe access to cabin + cargo/box area).

  • A compatible Geotab GO device already installed and commissioned (see GO9 KB article).

  • TPM kit components (TPM module + temperature probes + cabling/harnessing per your kit).

  • Basic install tools and consumables:

    • Cable ties, mounting tape/fasteners, grommets as required

    • Split loom/conduit for cable protection

    • Drill + step bit only if a new bulkhead pass-through is required

    • Multimeter (recommended) for checking supply/ground where applicable

Kit Components and What They Do

Based on the manufacturer brochure and product page, TPM is typically provided as:

  1. TPM main module
    The central interface that connects to the GO device and manages sensor inputs.

  2. Digital temperature sensors (probes) (up to 6)
    Installed inside the monitored compartments to measure temperature and provide continuous logs.

  3. Sensor harnessing / splitter loom
    A multi-drop cable assembly to connect multiple probes back to the TPM module (often shown as chained/split connectors).

Physical Installation

1) Choose sensor locations (cold-chain best practice)

Decide where each probe must read temperature. Common placements:

  • Primary zone temperature: mid-height, central area of the load space (not against walls).

  • Critical point temperature: near doors or known warm/cold spots (if the process requires it).

  • Multiple compartments: one probe per compartment zone.

Avoid

  • Direct airflow blast from the evaporator outlet (can cause false lows)

  • Direct contact with metal surfaces (can bias readings)

  • Areas prone to impact from pallets/forklifts

2) Mount the TPM module

Install the TPM module in a protected location, typically:

  • Inside the cabin behind trim (if wiring is cabin-focused), or

  • In a protected service compartment close to the GO device / IOX wiring

Mounting guidance

  • Keep it dry and away from heat sources

  • Ensure cable access and serviceability

  • Secure it to prevent vibration damage

3) Route sensor cabling into the monitored area

Run the probe harness from the TPM module to the cargo/box area:

  • Use existing grommets/pass-throughs where possible.

  • Protect cabling with split loom and secure at regular intervals.

  • If drilling is required, always:

    • Deburr the hole

    • Use a grommet

    • Seal properly to prevent water ingress

4) Install and secure each temperature probe

For each probe:

  • Position the probe tip at the agreed measurement point.

  • Secure probe and slack cable so vibration does not fatigue connectors.

  • Label probes (e.g., T1 Front, T2 Rear, T3 Compartment B) to simplify commissioning and reporting.

5) Connect probes to the TPM harness

  • Connect each probe to the splitter loom/harness branch.

  • Ensure connectors are fully seated and strain-relieved.

  • If not using all probe ports, secure unused connectors to prevent rattling and contamination.

6) Integrate TPM to the GO device (IOX)

TPM is designed to connect through the GO device ecosystem (“IOX protocol”).

  • Locate the GO device IOX expansion interface used in your standard build.

  • Connect TPM as per your tenant’s approved wiring standard (and the GO9 KB article for IOX best practice).

  • Confirm the GO device is powered and online after the final connection.

If your scope includes door/humidity/compressor monitoring, connect those inputs at this stage according to your tenant’s solution design.


Validation in Perspio

Once source data is confirmed, validate the integrated output in Perspio:

  1. Navigate to Assets and open the target asset.

  2. Check the telemetry / sensor area for temperature data in the Snapshot and Metrics.

  3. Confirm:

    • Temperature readings are visible

    • Units (°C/°F) match your tenant standard

    • Readings align with expected environment (allow a stabilisation window after install)


Troubleshooting – My Temperature Data Is Missing

Use this checklist in order:

  1. GO device not online

    • Confirm the GO device is reporting in MyGeotab and has recent data.

  2. No engine measurements appear

    • Re-check the IOX/TPM connection and any inline connectors.

    • Confirm TPM is correctly attached to the GO IOX ecosystem.

  3. Some probes report, others do not

    • Swap probe positions to isolate whether the issue follows the probe or the port.

    • Inspect connectors for partial insertion, moisture, or pin damage.

    • Verify probe routing hasn’t introduced a pinch point or cut.

  4. Values look incorrect

    • Confirm probe placement (avoid evaporator blast zones and metal contact points).

    • Allow time for stabilisation after doors are closed and refrigeration is running.

  5. Perspio shows no data but MyGeotab does

    • Confirm the tenant’s integration mapping expects TPM channels.

    • Validate the asset is linked to the correct device record and telemetry stream.


Summary

The Didcom Temperature Monitoring Kit (TPM) extends a Geotab GO installation with multi-probe temperature monitoring and optional cold-chain signals such as door and compressor status, providing a logged temperature trail suitable for audit and compliance workflows.