Chapter 5 — Maintenance and Troubleshooting Page 41
Annual recertification
A dated Certificate of Conformance has been supplied with the
Humilab system from the factory. This document indicates trace-
ability to the National Institute of Standards and Technology
(N.I.S.T.), in Gaithersburg, MD, USA. Under most regulatory stan-
dards, this certification is good for one year from date of issue. If
your regulations require that the Humilab be re-certified annually,
there are two methods you should consider.
• Return the unit to GE General Eastern for re-certification
• Have it re-certified in your standards laboratory if adequate
traceable standards are available.
Troubleshooting the Humilab, system diagnostics
Is the system
operating
correctly?
The Setpoint display (lower right) shows the R.H. that you have set
the test chamber to. The Humidity display (upper left) shows the
actual R.H. in the chamber, as read by the chilled mirror hygrom-
eter. Do they agree within the instrument specifications?
Set Point RH and Actual RH do not Agree within Specifications.
Actuate the setpoint select switch. You will instantaneously get a
reading in the Setpoint display window that is the actual value
needed to generate the previously displayed setpoint. That is, it is
the R.H. value selected by the SETPOINT switch (plus or minus a
correction value).
Set Point RH and the Corrected Reading Differ by more than 5%.
Check the following to determine the source of the problem.
• Is a green letter “S” illuminated in the window to the right of
the Control Status light?
If so, the mirror needs cleaning due to buildup of dust on the
surface. See mirror cleaning instructions earlier in this chapter.
• Did you fill the reservoir with water and run a calibrate cycle
without an adequate waiting period for the water temperature
to completely equilibrate to ambient?
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