Thermo Scientific Mercury Freedom 80i Manual page 56

Troubleshooting
System Troubleshooting Guides
4-10 Mercury System Manual
Malfunction
Poor linearity
Before the Mercury System leaves the factory, all instrument are configured
and tested for proper intercommunication functionality. The following
Steps are required only if there is a problem or when a system is configured
in the field.
Use the following procedure to establish communication between the
instruments in the Mercury System.
Possible Cause Action
Hg is not being adsorbed by the
sampling system. Lines carrying Hg
must be made from clean Teflon.
Instrument is not Go to the Calibration Factors menu and
properly calibrated verify that the Hg(t) Background and
Hg(t) Coefficient are set appropriately.
Input board Go to Service menu and select Input
malfunction Board Calibration > Input Frequency
Display (ignore warning), and press
Enter (leave Test off).
At Gain = 1; Frequency = approx. 12
kHz.
At Gain = 10; Frequency = approx. 80
kHz.
At Gain = 100; Frequency = approx. 400
kHz.
Signal cable failure Go to Service menu and select Input
Board Calibration > Input Frequency
Display (ignore warning), and press
Enter (leave Test off).
Change Gain to 100. Frequency should
be approx. 400 kHz. Unplug PMT signal
cable. Frequency should drop to
approx. 6 kHz.
PMT failure Check that the PMT voltage is approx.
750V (Service menu or Diagnostics
menu).
Lamp assembly Check that the lamp intensity is
failure approx. 80 kHz (Diagnostics menu).
Nitrogen Generator Ensure air flow to Nitrogen Generator
feed air is not stable is regulated.
Insufficient air of Check flows under Diagnostics menu
nitrogen flow to 81i in 81i.
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