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VDL (E3.1) 10/2020 Page 127/196
16.5 Test alarm of the safety temperature limiter (TL)
The safety temperature limiter (TL) provides temperature monitoring with a fixed switching threshold. It is
an essential element of the manufacturer's safety plan to prevent ignition and explosions (chap. 3.1). There-
fore, an annual function check by the operator is recommended. To do this, you can use the controller test
routine described following. The test is performed on an empty chamber (without vacuum expansion racks
and rack holders).
If the ambient temperature is below 28 °C, the chamber must be heated up to 28 °C to 38 °C before starting
the test. To activate the heating, the chamber must first be evacuated below 100 mbar. This negative pres-
sure is maintained during the test.
For chambers equipped with a single safety temperature limiter (TL), this is tested with the setting “1”. For
chambers with 2 TB, the test is run twice, first with the setting “1” and then again with the setting “2”.
Chambers with one TL Chambers with two TL
VDL 23
VDL 23-UL
VDL 115
VDL 56
VDL 56-UL
VDL 115-UL
Path: Main menu > Settings > Various
Submenu “Various”.
“Test temp. limiter” setting menu.
To activate the test alarm for the first TL, enter
“1” and press the Confirm icon.
Submenu “Various” with activated test alarm
“1”.
Press the Confirm icon and go back to Normal
display.
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