Thermo Scientific Mercury Freedom 80i, Руководство пользователя

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Troubleshooting
System Troubleshooting Guides
4-18 Mercury System Manual Thermo Fisher Scientific
Malfunction Possible Cause Action
orifice assembly. If there is low
flow or no flow, clean orifice in
an ultrasonic bath or by
pressurizing orifice with water.
Low total efficiency Mercuric chloride is being
lost on cold spots Check probe insulation and repair
as necessary.
Prior to System Integrity
test, baseline Hg reading is
not flat oxidizer not fully purged
from previous test Increase Post Condition duration.
High 80
i
pressure Leaks in tubing Check probe tubing for leaks and
repair as necessary.
Table 4–9
describes possible malfunctions and provides the recommended
action to take to restore the system to normal operation. When a reference
to a manual is included in the Action description, go to the associated
manual, such as the 80
i or 81 i , not this “Mercury System Manual.”
Table 4–9. Troubleshooting – Miscellaneous
Malfunction Possible Cause Action
Excessive noise
or spikes on
analog outputs Defective or low
sensitivity PMT With previous coefficients and PMT voltage
known, introduce a known concentration of span
gas.
Defective input board
or BNC connection Identify the defective component and replace.
Noise pick-up by
recorder or data logger Check analog cable shielding and grounding.
Try to localize source of noise by comparing
analog signal to data collected through RS-232
or Ethernet.
Excessive
response time Averaging time is not
set correctly Go to Averaging Time (Main Menu) and verify
setting (should be one minute).
Instrument is not
drawing in sample at
normal flow rate Check sample flow and pressure readings
(Diagnostics menu).
Use an independent flow meter to check flows
at the Hg(0) or Hg(t) inlet and exhaust bulkheads
(they should match). Instrument should be in
Manual mode with either Hg(0) or Hg(t) selected.
Perform a leak test.
Hg is being adsorbed
and/or released by dirt Replace any lines made of vinyl or other plastics
with fresh Teflon. Replace Teflon filter
Troubleshooting -
Miscellaneous