M&C TechGroup N9 KP18 Operator's manual - Manual (Page 18)

18
Gas sampling and conditioning technology 6-1.2.1ME
15 TROUBLE SHOOTING
Before working on the pump isolate the power supply securely, then check that the lines are not live.
The following tips for fault-finding are best employed in the sequence shown.
Problem/indication Possible cause Action/Check
Pump produces no
flow
No main supply. Check power supply. Check plug for correct fit.
Thermal switch has opened
due to over-heating. Disconnect pump from mains and allow to cool.
Race cause of over-heating and eliminate it.
Connections or lines are
blocked. Remove blockade.
An external valve is closed
or a filter is blocked. Open valve or clean blocked/dirty filter.
Liquid (condensate) has
collected in the pump head. Let the pump for a few minutes pumping air.
Flow, pressure or
vacuum too low Diaphragm or valves are
worn out. Change diaphragm or/and valves.
Compare the actual per-
formance with the figures in
the technical data. The pump is not designed for this condition.
There is pressure on the
pressure side and at the
same time vacuum or a
pressure above atmospheric
on the suction side. The pump is not designed for this condition.
The cross-section of pneu-
matic lines or connected
components is too small, or
they are restricted. To measure the performance, disconnect the
pump from the system (smaller diameter tubing
or a valve can significantly affect performance).
A leak at a connector, in a
line or in the pump head. Insulate the leak, tighten the screws, clean or
exchange dirty parts.
N O T E !
If the pump does not operate properly and you cannot find any of the
above mentioned faults, send it back to M&C.
If you send the pump for repair please include information about the
medium it was handling.
In particular, if it was handling aggressive substances our engineers
must be informed.
If you have been handling dangerous or highly aggressive gases please
clean the pump before despatch.