ThermoLogger (3-channel Data Logger for K-Type Thermocouple)

Limitations Discovered During Real Kiln Use
After extended use alongside a kiln temperature controller, several limitations became apparent that are important for potential buyers to understand.
1. No Ability to Apply a Temperature Offset or Calibration Adjustment
The most significant limitation is that there is no user‑accessible way to apply a temperature offset or calibration correction to the thermocouple readings.
In real kiln and furnace environments:

Different instruments frequently read 20–60°F apart due to cold‑junction compensation differences.
Controllers often allow input calibration; the DingKey ThermoLogger does not.
Even when the offset is consistent and well understood, the logger always records raw values.

Because of this, users must manually apply offsets during post‑processing in Excel or other software. While workable, this is inconvenient and error‑prone, especially for long‑term logging or comparative analysis.
Suggested improvement:
Add a simple per‑channel temperature offset (+/‑ °F or °C) in the web interface.

2. Thermocouple Dropouts Logged as Blank Data Without Explanation
During a kiln firing, one thermocouple channel intermittently logged blank values while other channels continued recording normally.
This behavior appears to be related to internal thermocouple fault detection (open circuit / short detection), but:

The CSV file provides no indication why a value is missing
Fault states are not logged
Dropouts can look like random data loss to users unfamiliar with the internal hardware

For kiln or furnace users, this can be confusing and raises concerns about data integrity.
Suggested improvements:

Log fault codes alongside temperature data
Or record a clear error value/status column instead of leaving cells blank
Mention expected fault behavior clearly in the documentation

3. Device Controls Can Accidentally Stop Logging During Operation
While navigating the device menus during a firing, logging stopped and had to be restarted. Later review of the data showed that the log had split into multiple recording sessions.
This appears to be related to the single‑button control scheme, where certain presses toggle logging on/off.
In a process environment, especially during long fires:

It is easy to accidentally stop logging
There is minimal on‑device feedback indicating logging has stopped
This can result in missing critical portions of a run

Suggested improvements:

Optional “lock logging” mode once recording starts
Clearer on‑screen indication that logging is active
Optional disable of button controls during logging

Documentation & Expectations
Many of these limitations would be easier to accept if they were clearly explained up front.
The product works well as a raw data logger, but it is less suitable for:

Comparative calibration against kiln controllers
Environments where offset adjustment is required
Users expecting controller‑style calibration features

Clear documentation around:

Lack of offset capability
How thermocouple faults are handled
Best mounting practices for cold‑junction accuracy

…would set much better expectations and reduce user frustration.