June 2003
2-20
Troubleshooting and Maintenance
Replacing and
Recalibrating the
Moisture Probes
For maximum accuracy you should send moisture probes back to the
factory for recalibration every six months to one year, depending on
the application. Under severe conditions you should send the probes
back for recalibration more frequently; in milder applications you do
not need to recalibrate probes as often. Contact a GE Panametrics
applications engineer for the recommended calibration frequency for
your application.
When you receive new or recalibrated probes, be sure to install and
connect them as described in Chapter 1,
Installation,
of the
Startup
Guide
. Once you have installed and connected the probes, enter the
calibration data as described in
Entering Calibration Data
, in Chapter
2 of the
Startup Guide.
Note that each probe has its own Calibration
Data Sheet with the corresponding probe serial number printed on it.
You do not have to enter calibration data for the Moisture Image
Series Probe if you returned both the sensor and the electronics
module to the factory for recalibration. However, you should verify
that the calibration data entered at the factory is correct (see page
2-12 of the
Startup Guide
). If you only sent the sensor part of the
Moisture Image Series Probe to the factory without the module, you
must enter the calibration data manually.
Recalibrating the
Pressure Sensors
Since the pressure sensor on a TF or Moisture Image Series Probe is a
strain gage type, the pressure calibration is linear and is calibrated at
two data points. Each point consists of a pressure value and a
corresponding voltage, current, or FP value. Check or change the two
calibration points using the steps below.
1.
Set one of the boxes in the matrix format to display pressure in
mV (or FP). Refer to
Setting Up the Matrix Format
on page 2-31
of the
Programming Manual
to set up the screen.
2.
Expose the pressure sensor to the air and record the mV (or FP)
reading. This reading is the mV reading for the zero pressure.
3.
Expose the pressure sensor to a known full scale pressure source
and record the mV (or FP) reading. This reading is the mV (or FP)
reading for the span pressure.
4.
Enter the above readings in the System Calibration Menu as
described in
Entering Pressure Calibration Data
in Chapter 2 of
the
Programming Manual
.
Summary of Contents for Moisture Image 1 Series
Page 2: ...Moisture Image Series 1 Service Manual ...
Page 8: ...Chapter 1 ...
Page 31: ...Chapter 2 ...
Page 61: ...Appendix A ...