Metrohm 709 IC Pump - Manual (Page 34)

4 Notes – Maintenance – Faults
709 IC Pump
26
Precipitates
Salt crystals between the piston and the seal are the cause of abrasive
particles, which can enter the eluent. These lead to contaminated
valves, pressure rise and in extreme cases to scratched pistons. It is
thus essential to ensure that no precipitates can appear, e.g. when
the eluent is changed. Solutions used in direct succession must there-
fore be miscible. If the system has to be rinsed with an organic solution,
several solvents with increasing or decreasing lipophilic character may
possibly have to be used (e.g. water ↔ acetone ↔ chloroform).
4.2 Maintenance and servicing
4.2.1 General information
Care
The 709 IC Pump 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 709 IC Pump must be
immediately disconnected to prevent extensive damage to the
instrument electronics. Inform Metrohm service if your instrument has
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 709 IC Pump is best done as part of an annual ser-
vice 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.