6. Maintenance
6.1 Cleaning probe
• Lint-free cloth
• Isopropyl alcohol (70 %)
Do not attempt to clean the sensors (other than the HUMICAPâ
180L2 sensor) under the filter in any way.
CAUTION!
1. Moisten a lint-free cloth with isopropyl alcohol (70 %).
2. Wipe the probe head and cable with the lint-free cloth.
Do not spray anything directly on the probe head or immerse the probe head
in liquid, since that may deposit impurities on the sensors.
Do not wipe the filter: wiping the filter may block its pores and/or deposit
residue on the filter. If the filter is heavily contaminated, replace it.
3. After cleaning the probe, it is recommended to perform a chemical purge.
More information
‣
Chemical purge (page 13)
‣
Replacing filter (page 23)
6.2
Cleaning HUMICAP 180L2 sensor
• Instrument air
• Liquid heptane (C
7
H
16
)
Oxidation of oil on the HUMICAPâ 180L2 sensor may cause extended response times or
drifting. To prevent oxidation, clean the sensor before storing HMM170 and before calibration.
1. Blow instrument air on the probe head (with filter attached) to remove the remains of oil.
HMM170 User Guide M212259EN-D
22
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