Vaisala HUMICAP HMT330 SERIES Uživatelská příručka stáhnout pdf (Strana 132)

User's Guide ______________________________________________________________________

132 _________________________________________________________________ M210566EN-H

Changing the Sensor

The user can change the HUMICAP180 and HUMICAP180R sensors. If

the transmitter has the chemical purge and/or warmed probe option

(which utilize the HUMICAP180C or HUMICAP180RC sensor), the

sensor cannot be changed by the user.

Changing the sensor should be considered corrective maintenance, and it

is not necessary in normal operation. If the accuracy of the transmitter

does not seem to be within specification, it is more likely that the

transmitter is in need of calibration and adjustment, and not sensor

replacement. Refer to chapter Calibration and Adjustment on page 137.

NOTE

When replacing the sensor, the new sensor must be of the same type as

the old sensor (for example, HUMICAP180R). The sensor type can only

be changed at a Vaisala Service Center.

1. Remove the filter from the probe. See the instructions in section

Changing the Probe Filter on page 131.

2. Remove the damaged sensor and insert a new one. Handle the new

sensor by the plastic socket. DO NOT TOUCH THE SENSOR

PLATE.

3. Perform a calibration and adjustment as instructed in section

Relative Humidity Adjustment after Sensor Change on page 142.

4. Attach a new filter on the probe. When using the stainless steel

filter, take care to tighten the filter properly (recommended force

5 Nm).

0508-079

Figure 68 Changing the Sensor

The following numbers refer to Figure 68 above:

1 = Pull out the sensor

2 = Plastic socket

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 177 178

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Vaisala HUMICAP HMT330 SERIES Uživatelská příručka Strana 132