Vaisala HMW90 - Manual (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
1 = HTM10 module that includes a HUMICAP
® sensor for humidity
measurement and a digital temperature sensor.
2 = 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.
1
2