Vaisala DPT145 User's Guide download pdf (Page 50)

User's Guide _______________________________________________________________________

50 ___________________________________________________________________ M211371EN-D

CHAPTER 7

TROUBLESHOOTING

This chapter describes common problems, their probable causes and

remedies, and provides contact information for technical support.

Solving Typical Problems

Some problems can be solved by simply resetting the transmitter. You

can reset the transmitter by disconnecting the power or issuing the

RESET command using the service port.

If resetting does not help, and if the problem is related to transmitter

software or settings, you can restore the factory configuration of the

transmitter by issuing the FRESTORE command. If you are unable to

solve your problem with the transmitter, contact Vaisala technical

support. See section Technical Support on page 52.

Table 10 Troubleshooting Table

Problem

Possible Causes and Solutions

Dewpoint reading is not stable

after installation: reading

indicates slow drying.

This is normal behavior after installation. See

section Stabilization of Dewpoint Reading

After Installation on page 29.

Pressure reading is not stable:

reading indicates falling

pressure. Dewpoint

temperature may be rising.

Leak in the measurement environment.

Locate and repair the leak.

Transmitter outputs stars "****"

instead of measurement data

Possible causes: damaged sensor, incorrect

supply voltage, and unsuitable measurement

environment.

Power cycle or reset the transmitter, and see

if the problem continues. Check the active

errors using the ERRS command. Check the

power supply.

Unable to access transmitter on

the RS-485 line.

Possible causes: Incorrect wiring, unknown

serial settings, transmitter in POLL mode

with unknown address.

Check wiring. Try connecting as instructed in

section Unknown Serial Settings on page 52.

Issue the ?? command to make the

transmitter respond in POLL mode.

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Vaisala DPT145 User's Guide Page 50

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