3.3.5 Cleaning the sensor and the shield
CAUTION!
Do not place the transmitter module into the
solvents. Insert only the sensor portion of the
instrument. Do not allow the sensor to come
into contact with the surfaces of cleaning
containers or with any other hard surface.
1. While wearing protective gloves, place the sensor in the
first container of hexane or toluene and allow it to soak
for 10 minutes.
2. Remove the sensor from the hexane or toluene and soak
it in the container of distilled water for 10 minutes.
3. Remove the sensor from the distilled water and soak it
in the second (clean) container of hexane or toluene for
10 minutes.
4. Remove the sensor from the hexane or toluene and
set it aside in a clean area.
5. Repeat steps 1 to 3 to clean the shield. To ensure the
removal of any contaminants that may have become
embedded in the porous walls of the shield, swirl the
shield in the solvents during the soaking procedure.
6. Remove the shield from the hexane or toluene.
7. Carefully replace the shield over the exposed sensor
without touching the sensor.
8. Place the sensor with the installed shield in an oven
set at 50°C ± 2°C (122°F ± 3.6°F) for 24 hours.
3.3.6 Installing the probe in the transmitter
To install a new or cleaned probe in the transmitter,
complete the following steps:
1. Reconnect the probe cable to the top of the probe by
turning the locknut.
2. Carefully push the probe into the transmitter.
3. Replace the metal plate without touching the sensor.
4. Tighten the four captive screws on the metal plate into
the bottom of the transmitter.
3.3.7 Evaluating the cleaned probe
Note: All new probes are calibrated at the factory, and no
evaluation is required after installation.
1. Reconnect the probe cable to the transmitter module
and measure the ambient air dew point. Make sure to
measure the same ambient air as measured during
removal of the transmitter.
2. Compare the two ambient air readings. If the new
ambient air reading is within ±2°C (±3.6°F) of the first
reading, the cleaned probe is properly calibrated and
normal operation may be resumed.
3. If the probe is still not reading the ambient air accurately,
repeat the cleaning procedure using soaking times
that are five times those used in the previous cleaning
sequence. Repeat the cleaning cycles until two
consecutive ambient air readings are identical.
If the above cleaning procedure does not result in accurate
readings, contact Panametrics for assistance.
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