Memmert HCP 246 Humidity Chambers (Generation 2003) - Manual (Page 26)

HCP page 26
Calibration correction for user-calibration
(see section 17)
Exit setup mode
= store all settings and exit SETUP mode
11.1 Real-time clock
The real-time clock is set in SETUP and includes date and clock time.
The real-time clock serves for documentation according to GLP.
Date and clock time are marked in the report print.
On the graphics print the time axis is marked in real-time.
The clock runs with a buffer battery independently of the mains power supply.
The built-in lithium battery Type CR 2032 has a life of approx. 10 years.
12 Temperature monitor and protection devices
The monitor temperature is measured with a separate PT100 temperature sensor inside the chamber. The
monitor unit provides protection for the oven load as well as protection for oven and its surroundings.
The oven is provided with duplicate overtemperature protection (mechanical / electronic) according to DIN
12880.
12.1 Mechanical temperature monitor: temperature limiter (TB)
All ovens of the HCP series are equipped with a mechanical temperature limiter (TB) Protection Class1 to
DIN 12880.
If the electronic monitor system should fail during operation and the fixed factory-set maximum temperature
is exceeded by approx. 20°C the temperature limiter switches off the heating permanently as a final
protective measure. The symbol lights up as warning.
Fault rectification after the TB cut-out has been activated:
1.
Switch off the oven and allow it to cool down
2. Rectify the fault (e.g. replace temperature probe) and where appropriate contact customer service
3. The oven is again ready for operation only after it has cooled down and after the fault has been
rectified
°C
MIN
AUTO
MAX
visual alarm symbol
alight: TB alarm
flashing:
TWW alarm
ASF-alarm
undertemperature
protection
overtemperature
protection
audible
alarm signal
automatic
temperature monitor
(ASF)