Vaisala HMW90 User Manual download pdf (Page 74)

User's Guide _______________________________________________________________________

72 ___________________________________________________________________ M211399EN-F

Repair Maintenance

Replacing the Measurement Module

If you cannot restore the measurement accuracy of the transmitter by

calibration and adjustment, you can replace the measurement module

inside the transmitter. The measurement module is the small separate

component board that is connected to the bottom of the component

board; see Figure 4 on page 18.

1203-034

Figure 30 HTM10 and TM10 Modules

where

HTM10 module that includes a HUMICAP

sensor for humidity

measurement and a digital temperature sensor.

TM10 module with a digital temperature sensor.

Replace the module in your transmitter with the same type as used

originally. Replacing a TM10 module with a HTM10 module does not

turn a TMW transmitter (temperature only) into a HMW type (humidity

and temperature) transmitter.

NOTE

User calibration settings (adjustment by trimmers or service port) are

stored in the module. If you replace the module, you do not need to undo

the previously applied correction.

CAUTION

Handle the HTM10 module carefully. When reinstalling the transmitter

body to the mounting base, avoid touching the module or the

HUMICAP

sensor.

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Vaisala HMW90 User Manual Page 74