Quick answer: The testo 150 TC4 is a Saveris 1 logger module with four thermocouple connections. Attach compatible thermocouples, assign and verify every channel, provide a supported communications module, and configure the time series and alarm limits for each monitored temperature point. It is not a humidity logger.
What the TC4 can and cannot measure
The manufacturer identifies the testo 150 TC4 as part 0572 3330, with four thermocouple inputs. Its accuracy and useful temperature range depend on the chosen thermocouple type and probe specifications, including junction placement, cable conditions and connection integrity. Testo lists thermocouple accessories for this model. A TC4 connection does not directly accept a humidity sensor simply because it has a vacant channel.
Plan channels for a process
| Channel | Illustrative location | Check |
|---|---|---|
| 1 | Process air or furnace-adjacent test point | Probe temperature rating |
| 2 | Product simulator or separate process point | Sensor junction location |
| 3 | Return or exhaust location | Electrical and thermal interference |
| 4 | Independent point or spare | Naming and configuration before use |
The locations are examples only. A thermocouple chosen for high temperature can be unsuitable for a different medium, and the safety of insertion must be assessed by qualified personnel.
Configure and verify all four inputs
- Identify each thermocouple, including supported type and connection/adaptor, and inspect cables for damage.
- Assign unique channel names that match the physical sampling positions, preferably using a controlled channel map.
- Connect the logger to a supported Saveris 1 communication route and confirm the system clock and live values.
- Apply approved per-channel intervals and alarm criteria, not one assumed threshold for every location.
- Check each probe against a suitable independent temperature reference where the site procedure requires it, and document the results.
- Exercise the logging and alert workflow with a controlled event and confirm all channel histories are available.
Example: how much data will be produced?
Hypothetical: four active thermocouples logging every 2 minutes generate 30 observations per channel per hour, or 120 channel-observations per hour across the module. Over eight hours this is 960 channel-observations. This count is a planning calculation, not a statement about storage capacity or network traffic. For related guidance, see Logging Explained: Choosing Sampling Intervals for Accuracy and Storage.
Diagnose inconsistent channel values
- Swapped probes or incorrect channel mapping can mimic a process imbalance.
- Loose or damaged thermocouple connections can cause missing or implausible values.
- Thermal coupling to metal supports and inadequate immersion change what the sensor actually measures.
- Intermittent communications may postpone display updates; compare logged timestamps before blaming the process.
When temperature-and-humidity monitoring is required
Use this TC4 module for its verified thermocouple functionality and select an additional humidity-capable measuring channel or separate supported device for RH. Neither the TC4 name nor four temperature inputs implies combined temperature/RH sensors. In regulated process monitoring, sensor traceability, user access and audit-trail configuration also belong in the commissioning record. For related guidance, see testo 164-H1: How to Configure Temperature and Humidity Monitoring.