L60iF Issue 9 November 2018
10
5. Maintenance, servicing and fault location
5.1 Regular maintenance
5.1.1 Surface cleaning for decontamination will be carried out in accordance with locally issued instructions.
5.1.2 The filter holder should be cleaned after every sampling run.
5.1.3 The air filter at the rear of the instrument should be changed at intervals, six months is recommended
initially. For safety,
Disconnect from the mains and allow the fan to stop before removing the grille.
The filter elements are easily changed and are very inexpensive, so if the interior of the sampler is found to
be accumulating material, the filter should be changed more frequently. Spare filter elements are available
from Munro Instruments.
5.2 Servicing
5.2.1 The main part of the Sampler requiring regular attention is the pump. The pump blades or vanes wear
and should be inspected at least annually and more regularly if the Sampler is in constant use. If servicing is
to be carried out locally, a course is available from Munro Instruments on Large Volume Air Sampler
maintenance and servicing, which includes stripping down and re-assembly of pumps, checking blade
dimensions and making performance measurements. Regular service checks are recommended as good
practice and as preventive maintenance, avoiding catastrophic failures.
5.2.2 The Sampler should be re-calibrated annually against a traceable standard flowmeter.
5.3 Fault location
5.3.1 If the flow starts to decrease, the pump almost certainly needs cleaning.
5.3.2 If the Sampler stalls for any reason (e.g. dust in the pump) the over current cut out will activate and
isolate the motor to avoid over-heating. The unit should be sent for maintenance immediately. The cut out
button can be reset once (by pressing it in until it locks) but this should not be repeated if it activates again.
5.3.3 If the display shows an abnormal message, power down and up again. If this does not cure the fault,
seek advice from Munro Instruments.