HF131PEN_v0501_05
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6. MAINTENANCE
6.1. GENERAL
DIRECTIONS
Mounting, electrical installation, start-up and maintenance of the instrument may only
be carried out by trained personnel authorized by the operator of the facility. Personnel
must read and understand this Operating Manual before carrying out its instructions.
The F131-P may only be operated by personnel who are authorized and trained by the
operator of the facility. All instructions in this manual are to be observed.
Ensure that the measuring system is correctly wired up according to the wiring
diagrams. Protection against accidental contact is no longer assured when the housing
cover is removed or the panel cabinet has been opened (danger from electrical shock).
The housing may only be opened by trained personnel.
Take careful notice of the " Safety rules, instructions and precautionary measures " in
the front of this manual.
The F131-P does not require special maintenance unless it is used in low-temperature applications
or surroundings with high humidity (above 90% annual mean). It is the users responsibility to take all
precautions to dehumidify the internal atmosphere of the F131-P in such a way that no condensation
will occur, for example by placing dry silica-gel sachet in the casing just before closing it.
Furthermore, it is required to replace or dry the silica gel periodically as advised by the silica gel
supplier.
Battery life-time:
It is influenced by several issues :
Type of sensor: read chapter 3.2.3. NPN and PNP inputs consume more energy than coil inputs.
Input frequency: the higher the frequency, the shorter the battery life-time.
Flowrate calculation: the lower number of pulses (SETUP 26) the shorter the battery life-time.
Analog output signal; be sure that an external power supply is connected or that the function is
disabled if not in use; or else it will have a major influence on the battery life-time (SETUP 71).
Display update: fast display update uses significantly more power; SETUP 51.
Pulse output and communications .
Low temperatures; the available power will be less due to battery chemistry.
Note:
It is strongly advised to disable unused functions.
Check periodically:
The condition of the casing, cable glands and front panel.
The input/output wiring for reliability and aging symptoms.
The process accuracy. As a result of wear and tear, re-calibration of the flowmeter might be
necessary. Do not forget to re-enter any subsequent K-factor alterations.
The indication for low-battery.
Clean the casing with soapy-water. Do not use any aggressive solvents as these might damage
the polyester coating.
