Fluke Datapaq Reflow Tracker User Manual page 52

Testing the Logger and Thermocouples
Although thermocouples are generally robust, they can be damaged during
handling. Use the following procedure to confirm the operation of logger and
thermocouples after installation. Note that this test is not an alternative to
calibration (see the dedicated User Manual for your logger), but will highlight a
malfunctioning logger or faulty probes and thus avoid a wasted profile run.
Do one of the following:
• With a full set of thermocouples attached to the logger, and the logger
connected to a PC running Insight, open the Logger Reset dialog or the
Diagnostic section of the Communications Setup dialog; this shows current
probe temperatures – or...
• Set up the system as if to monitor a profile run using hardwired telemetry
(see the dedicated User Manual for your logger), and note the temperatures
registered by the thermocouples as they are displayed in Insight – or...
• To test the thermocouples alone, use a digital thermometer (of a type to
match the thermocouple type) and attach it to each thermocouple in turn.
Proceed as follows.
1. Note readings first at ambient temperature: thermocouples registering no
data in Insight, or an open circuit with a digital thermometer (*OC* in the
Communications Setup dialog), may be broken. Inconsistent readings may
indicate an intermittent short circuit.
2. If a satisfactory ambient reading is recorded, apply heat to the thermocouple-
tip via fingers or other heat source. An increased temperature should register.
○ If the reading does not change, the thermocouple is short circuit or has
other damage and must be replaced.
○ If the temperature shows a decrease, the thermocouple connections are
reversed.
3. Confirm correct operation at 100°C by placing the thermocouple-tip in
freshly-boiled water.
4. Replace any damaged thermocouples and test again.
Datapaq Service Department
If you cannot resolve your problem, please contact your nearest Datapaq
Service Department at Fluke Process Instruments. For contact details, see
www.flukeprocessinstruments.com – or email as follows:
Europe, Asia (except China), Africa, Australasia – datapaqservice@
flukeprocessinstruments.co.uk
China – service@flukeprocessinstruments.com.cn
Americas – auto-rma-us@fluke.com
52
Troubleshooting
REFLOW TR ACK ER