Thermo Scientific Mercury Freedom 80i, Manual

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Troubleshooting
System Troubleshooting Guides
4-16 Mercury System Manual Thermo Fisher Scientific
LED No. Description Action
flows. Check at probe also.
11 Chlorine valve (83 i ) Check tank and shutoff valve.
LEDs at the top of the 82 i interface board can be used to troubleshoot
communication and 24 V problems (
Table 4–7
). LED2 normally blinks
brightly and LED3 blinks dimly.
Table 4–7.
Communication and 24 V Troubleshooting – 82 i Interface Board LEDs
LED Status Malfunction Action
LED1 OFF 24 V power not applied to interface board Check cable.
LED2
LED3
OFF Bad RS-485 connection Check RS-485
connection.
Table 4–8
describes possible oxidizer malfunctions and provides the
recommended action to take to restore the system to normal operation.
Table 4–8. Troubleshooting – Oxidizer
Malfunction Possible Cause Action
Low total mercury reading
during oxidizer test Hydrator is leaking Leak test the hydrator to ensure
there are no gas leaks. Use a
hand vacuum pump and gauge
assembly, or pressurize to 10 psig
and use Snoop
®
leak test
solution.
Hydrator is dry Bottom cylinder is empty because
the I/O is not properly configured.
The top cylinder is out of water.
Cold spots in the probe
(low Hg(t) readings) The probe cover is off or not on
tightly.
Insulation is missing from internal
tube assemblies.
Poor recovery after an
oxidizer test without flue
gas If oxidizer tests are being
conducted (anywhere without flue
gas), adding humidity when in
Sample mode will "condition" the
probe quicker between oxidizer
runs. The added moisture will
remove excess Cl
2
and HgCl
2
.
O-ring seal on filter access
disk Remove the filter access disk, and
ensure that the face seal O-ring is
not scored or otherwise
compromised. Replace as
Troubleshooting 82
i
Interface Board LEDs
Oxidizer Troubleshooting