Vaisala DMP248 Manuel de service télécharger pdf (Page 73)

CHAPTER 7____________________________________________________________MAINTENANCE

VAISALA _________________________________________________________________________ 67

CHAPTER 7 MAINTENANCE

Reference measurements

Reference measurements are needed to verify whether the transmitter

readings are within specifications. This way the user can check if the

transmitter needs calibration or service.

The reference measurement should be made as close to the checked

sensor as possible and the readings should be read at the same time,

when possible. A re-calibrated DMP248 transmitter can be used as a

reference.

Self-diagnostics

The DMP248 transmitter goes through a self-diagnostics procedure

when the power is switched on. If the procedure does not reveal any

errors or faults, the transmitter starts operating normally. If errors or

faults are found, check first if the DRYCAP



sensor is damaged. If it

is intact, send the transmitter to Vaisala or a Vaisala representative for

repairs. The error messages the transmitter outputs are listed in

Appendix 5.

If any errors occur during operation, the error messages are output on

the local display if the transmitter displays measurements; if the

menus are used, error messages are not output. The LEDs indicate

errors at all times. During operation, however, the error messages are

not output automatically through the serial interface. If there is any

reason to doubt that there is something wrong with the transmitter, use

command ERRS:

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Vaisala DMP248 Manuel de service Page 73