In-Situ TROLL 9500 Operators Manual - Manual (Page 149)

144 0095110 rev. 007 01/09 TROLL 9500 Operator’s Manual
TROUBLESHOOTING SENSORS
Problem: Sensor will not go into port
Probable Cause: (1) Insufficient lubrication on sensor o-rings. (2)
Incorrect sensor alignment.
Suggested Remedy: (1) Generously lubricate sensor o-rings with a
good silicone lubricant. Remove excess lubricant with a tissue, and
take care to keep grease away from the area around the connec-
tor at the bottom of the sensor. (2) Align the mark on the side of
the sensor (it looks like a small white “V”) with the tic mark on the
sensor port. If you have trouble locating these marks, visualize the
sensor block as a clock face, with the pressure/turbidity sensor or
plug at 12:00. The port alignment marks are at the 3:00 position for
each port.
Problem: Sensor will not come out of port
Probable Cause: Inability to grasp sensor
Suggested Remedy: Try the sensor removal tool. Insert it between
the widest part of the sensor and the instrument body and press
down on the handle, prying the sensor up until it pops out.
Problem: Software does not recognize sensor in port
Probable Cause: (1) Sensor is not firmly seated in port. (2) Excess
lubricant or dirt in port. (3) Sensor is in a wrong port for its type.
Suggested Remedy: (1) Re-insert the sensor: Align the mark on the
side of the sensor (it looks like a small white “V”) with the tic mark
on the sensor port. Use sensor insertion tool to press sensor firmly
into port until you feel it dock with the connector. When properly
inserted a only a very small gap (0.060-0.075 inch, the width of the
sensor removal tool) remains between the widest part of the sensor
and the instrument body. (2) Remove excess lubricant and/or dirt
from the connector on the sensor and from the connector in the
port.
(3) Insure the sensor is in the correct port for its type. Some
sensors will function properly in any port, others will work only in
specific ports. Refer to diagrams in section 3 or specific sensor
section of this manual. Remove sensor and re-install in correct
port, if necessary, then refresh device information in the software.
TROUBLESHOOTING CALIBRATION
Problem: The Cal Cup leaks when rinsing sensors
Probable Cause: Cal Cup is not tightened to probe body sufficiently
to seat against the o-ring
Suggested Remedy: Carefully align threads on Cal Cup with threads
on instrument body. Thread the Cal Cup onto the body until it is
seated against the o-ring, then back off slightly to avoid overtight-
ening.
Problem: The DO readings stabilized during the Quick Cal but now
the readings are off (too high or too low)
Probable Cause: (1) Too much solution in Cal Cup during the Quick
Cal to expose the DO sensor to air. (2) Cal Cup is too tightly sealed
during calibration.
Suggested Remedy: (1) The DO membrane must be exposed to air
for a valid 100% DO calibration. If the membrane is submerged
when you invert the Cal Cup during the Quick Cal, remove the
end cap and pour out some of the calibration solution until the
membrane is in air. (2) Loosen the end cap of the inverted Cal Cup
during DO calibration to avoid pressurizing the chamber.
SECTION 22: TROUBLESHOOTING