Checking The Overtemperature Protection - Barkey warming center III DTM Service Manual

Technical safety inspections (TSI)
►
Wait until the display shows a temperature of 42°C and the measured temperature in
the heating chamber is stable. If the heating chamber is cold, this will take around 60
minutes. If the device is warm, the waiting period will be shorter.
►
Once the temperature reached has become stable, enter the temperature of the ref-
erence thermometer and the temperature displayed in the Barkey warming center III
DTM in the inspection log.
WARNING
If the temperature shown by the reference thermometer lies outside the prescribed
tolerance of 42°C ± 3°C, the Barkey warming center III DTM needs to be read-
justed (see chapter 6.2). The values shown on the device temperature display
must agree with the measured value of the reference thermometer by ± 1°C. If the
discrepancy is larger, the Barkey warming center III DTM needs to be readjusted
(see chapter 6.1). The TSI must be repeated afterwards.
►
Take the reference thermometer out of the Barkey warming center III DTM heating
chamber.
5.3

Checking the overtemperature protection

The Barkey warming center III DTM is fitted with two independent mechanisms to protect
it from high temperatures.
One of these is the electronic overtemperature protection. In this case, an independent
electronic system continuously checks the temperature in the air duct. If the measured
temperature becomes higher than 46°C, the heater is switched off. The error display on
the front panel also blinks.
The electronic overtemperature protection fault message can be reset by turning the de-
vice off and then on again. If the cause of the fault has not been rectified, the error mes-
sage will be displayed once again.
There is also an independent mechanical overtemperature protection system. The me-
chanical overtemperature protection is fitted directly on the heater and serves to protect
the entire device. If the temperature of 63°C at the heater is exceeded, this is switched off
permanently. The error display on the front panel also illuminates permanently. A tem-
perature of 63°C at the heater is equivalent to a temperature of around 51°C in the heat-
ing chamber.
WARNING
The room temperature must be at 22.0°C ± 1.0 K during the entire overtemperature
protection check. Incorrect values will be measured if this is not the case.
WARNING
Any overtemperature protection checks must be carried out when the
Barkey warming center III DTM has been heated up to 42°C. If this is not the case,
incorrect values will be measured during the overtemperature protection check.
Barkey GmbH & Co. KG - Gewerbestrasse 8 - 33818 Leopoldshoehe – Germany - Head Office: +49 (5202) 9801-0
Customer Service: +49 (5202) 9801-30 Fax: +49 (5202) 9801-99 - e-mail: info@barkey.de
Service manual
Barkey warming center III DTM
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