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16/08/2017, STS Instruments Ltd, Service & Maintenance Manual
PCB, LCD and keypad.
Check LCD and keypad are fully operational by navigating the
enus of the instru ent. Record any da age and degradation.
Check LCD and keypad are fully operational.
Pipe work
Check the internal piping is fastened, and there is no da age or
degradation. Replace any da aged sections.
Leak Check
Via View Stats in the Maintenance enu. Pressurise with N2 in
Phase 0, close N2 supply, allow 10 ins for stabilisation. Then
start recoding the te perature and if after 5 ins there has been
a 20% drop, check all the connections and repeat. If there is still
a leak, this line will need detailed inspection with the potential
for so e or all of the piping to need replacing. Then pressurise
with N2 in Phase 6 with the vent closed, close N2 supply, likewise
repeat the above step recording the pressure drop.
Pu p and Relief Valve
Via View Stats in the Maintenance enu, set to phase 2 and
record the pu p pressure. If the pressure is less than
approxi ate 15PSI, adjust relief valve and repeat. If the pressure
does not change, check for leaks.
Nitrogen Regulator
Via View Stats in the Maintenance enu, set to phase 0. Record
the nitrogen pressure. If the pressure is not approxi ately 10PSI,
adjust the regulator. If the pressure doesn't change, check the
cylinder is at 1Bar and check the internal piping for gas leaks. If
the issue still is there, replace the regulator.
Heaters
Via View Stats in the Maintenance enu, set to phase 1. Record
the Concentrator te perature. It should stabilise around
240degC. If it doesn't, return instru ent to anufacturer. To
check the Per eation heater, run a calibration cycle with a
te perature probe in the per eation oven. This probe should
stabilise around 80degC. If it doesn't return instru ent to
anufacture.
