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VDL (E3.1) 10/2020 Page 35/196
2.7 Testing and maintenance
The operator must ensure that the chamber is always in a technically functional state.
Observe the maintenance intervals specified by the manufacturer. If there is above-average strain, the
intervals must be shortened accordingly.
The operator must regularly verify that the safety-related devices are functioning correctly.
Document tests with results and measures that were potentially initiated, as well as maintenance and re-
pairs, in a system book.
For testing before commissioning, see Chap. 7
For recurring tests and maintenance, see Chap. 7.5, 7.6, 25.
2.8 Operation log
For safety reasons, keeping an operation log which documents each individual drying process is recom-
mended.
The following contents should be entered and recorded:
• Type of solvent
• Auto-ignition temperature of the solvent; in the case of solvent mixtures: solvent with the lowest Auto-
ignition temperature
• Entered temperature set-point (drying temperature)
• Drying temperature set-point
• Set safety controller mode temperature (Limit/Offset)
• Set safety controller value
• Date
• Signature
Use the following specimen or compile it in a suitable form.
Operation log for the VDL vacuum drying oven
Serial number...............................................
Solvent. In the
case of solvent
mixtures: solvent
with the lowest
Auto-ignition tem-
perature
Auto-ignition
temperature
[unit]
Drying tem-
perature /
temperature
set-point
[unit]
Safety controller
mode
Limit/Offset
Safety control-
ler value [unit]
Date Signature
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