3.3 Cleaning the moisture probe
To clean your HygroPro moisture probe, carefully follow the instructions in this section.
3.3.1 Preparing to clean the probe
CAUTION!
Be sure to perform the probe cleaning
procedure in a well-ventilated area. Observe
all necessary safety precautions when
handling the cleaning solvents
To clean the moisture probe, the following items are required:
• Two glass (NOT metal) containers with approximately
300 ml of reagent-grade hexane or toluene in each
container.
• One glass (NOT metal) container with approximately
300 ml of distilled (NOT deionized) water.
IMPORTANT
Make sure the containers are deep enough to completely
submerge the moisture probe. Do not place the
transmitter module into the solvents. Insert only the
moisture sensor into the solvents.
• Rubber or latex gloves
• An oven set at 50°C ± 2°C (122°F ± 3.6°F)
• 1-1/8” wrench
3.3.2 Replacing the RTE
To maximize HygroPro performance, Panametrics
recommends recalibration of the aluminum oxide moisture
sensor on the replaceable transducer element (RTE) every
6 to 12 months. The optimum interval depends on the
specific application. To accomplish this, either return
the RTE to Panametrics for recalibration or install a new
RTE. The HygroPro electronics will automatically read and
store the calibration data whenever a new or recalibrated
RTE is installed.
IMPORTANT
The programmed probe calibration data should not be
changed without consulting Panametrics.
3.3.3 Removing the transmitter from the system
Complete the following steps to remove the transmitter from
the installation site:
1. Refer to "Figure 2" on page 3 and use a 1-1/8” wrench
on the probe hex nut to unthread the transmitter from the
fitting on the sample system or process line.
2. Record the dew point of the ambient air.
3. Disconnect the cable from the transmitter module.
3.3.4 Removing the probe from the transmitter
To remove the probe from the transmitter, refer to "Figure 9"
on page 17 and proceed as follows:
1. Loosen the four captive screws on the bottom of
the transmitter.
2. Carefully remove the metal plate without touching
the sensor.
3. Carefully pull the probe out of the transmitter.
4. Disconnect the probe cable by turning the locknut at
the top of the probe. Then, detach the sensor.
Captive screws
Cable locknut
Probe
Metal plate
Figure 9: Removing the probe from the transmitter
17
