Metrohm 791 VA Detector - Manual (Page 37)

4.1 Maintenance and servicing
791 VA Detector
31
4 Maintenance – Malfunctions
4.1 Maintenance and servicing
Care
The 791 VA Detector requires proper care and attention. Excessive con-
tamination of the instrument could possibly lead to malfunctions and a
shorter service life of the inherently rugged mechanical and electronic
parts.
Spilled chemicals and solvents should be wiped up immediately. It is
especially important to protect the plug connections at the rear of the
instrument (particular the mains plug) against contamination.
Although constructional measures have been designed to virtually
eliminate such a situation, should corrosive media penetrate the
interior of the instrument the mains plug of the 791 VA Detector must
be immediately disconnected to prevent extensive damage to the
instrument electronics. Inform Metrohm service if your instrument have
been damaged in such a way.
The instrument must not be opened by untrained personnel. Please
comply with the safety notes in section 1.4.1.
Maintenance by Metrohm service
Maintenance of the 791 VA Detector is best done as part of an annual
service performed by specialists from the Metrohm company. If work is
frequently performed with caustic and corrosive chemicals, it may be
necessary to shorten the interval between servicing.
The Metrohm service department is always willing to offer expert advice
on the maintenance and servicing of all Metrohm instruments.
4.2 Shutdown
If the ELCD cell is shut down for a considerable length of time, the en-
tire HPLC or IC system (without column and suppressor) must be
rinsed free from salt with methanol/water (1:4) to avoid crystallization
of eluent salts with the corresponding subsequent damage.