SECTION 5
SOLVING PROBLEMS
5.2 Common TC Head Problems
Many years of field experience have shown that the majority of
problems encountered with the osmometer are with the thermocou-
ple sensor. It is suspended from the thermocouple mount, which
forms the upper half of the sample chamber. The thermocouple
mount is part of the thermocouple head assembly, referred to simply
as the “TC head.”
Common thermocouple problems affect instrument performance in
distinctive ways, providing significant clues that will be evident in the
behavior of the instrument. These are summarized below in order of
most likely occurrence.
COMMON TC HEAD PROBLEMS
Problem Symptom(s)
Thermocouple Contamination A shift in calibration. Error message
during calibration or Clean Test.
Deformed or Flattened Loss of high range readings or
Thermocouple precision.
Broken Thermocouple ERROR message on display or
wildly erratic behavior if the connection
is intermittent.
Disconnected TC Head ERROR message on the display.
Connector
Loose TC Head Screws Unstable calibration and erratic
readings. ERROR message during
calibration or Clean Test.
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