Maintaining and Troubleshooting the PM880 8-33February 2005Replacing and Recalibrating the MoistureProbesNote: Remove the probe cable by pulling back the spring-loadedsleeve and pulling the cable out of the connector.For maximum accuracy you should send moisture probes back tothe factory for recalibration every six months to one year,depending on the application. Under severe conditions youshould send the probes back for recalibration more frequently; inmilder applications you do not need to recalibrate probes as often.Contact a GE Infrastructure Sensing applications engineer for therecommended calibration frequency for your application.Note: You can program the PM880 to remind you when it is timeto send the probes back for recalibration. Refer to Settinga Probe Calibration Reminder page 4-6When you receive new or recalibrated probes, be sure to followthe instructions in Chapter 1, Getting Started, to install, connectand enter calibration data for the probe(s). Note that each probehas its own Calibration Data Sheet with the corresponding probeserial number printed on it.You do not have to enter calibration data for the Moisture ImageSeries (MIS) Probe if you returned both the sensor and theelectronics module to the factory for recalibration. However, youshould verify that the calibration data entered at the factory iscorrect (see Entering Setup Data on page 1-7). If you only sentthe sensor part of the MIS Probe to the factory without themodule, you must enter the calibration data manually.
