Chapter 5 Preventive Maintenance
External leaks
To test for the presence of leaks around the fittings, disconnect the sample input line and
plug the
SAMPLE
fitting. The flow as read in the Flow screen (Diagnostics menu) should
slowly decrease to zero. The pressure as read in the Pressure screen (Diagnostics menu)
should drop to below 250 mm Hg. If the pump diaphragm is in good condition and the
capillary not blocked, it should take less than one minute from the time the inlet is
plugged to the time the reading below 250 mm Hg is obtained.
Leaks Across the Optional Zero/Span and Sample Solenoid Valves
In order to check for leaks across the optional valves, plug the
SPAN
inlet line, press the
RUN
pushbutton and follow the procedure above. If the pressure drops below 250 mm
Hg the valve associated with the span line is okay. Repeat for the valve associated with
the zero line by plugging the zero inlet, press the
RUN
pushbutton and follow the
procedure above. If the pressure drops below 250 mm Hg. the valve associated with the
zero line is okay.
5-3
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