Vaisala GMW90 - Manual (Page 74)

User's Guide _______________________________________________________________________
72 ___________________________________________________________________ M211659EN-B
CHAPTER 6
TROUBLESHOOTING
This chapter describes possible problems, their probable causes and
remedies, and provides contact information for technical support.
Problem Situations
Table 11 Troubleshooting Table
Problem Possible Cause Remedy
Transmitter reports an
error on the display or
serial line.
Multiple causes. Refer to Table 12 on
page 73.
Temperature reading
shown by the transmitter
is too high.
Transmitter is installed in
an unsuitable location,
for example, near a heat
source or in sunlight.
Relocate transmitter.
See section Selecting
Location on page 24.
Transmitter installed in
improper orientation.
Reinstall transmitter with
the arrow on the
mounting base pointing
up.
Transmitter does not
recognize a valid serial
command, responds with
message
FAIL 1: Unknown
command
Advanced commands
not enabled.
Issue the PASS 9000
command.
Remote echo enabled on
the transmitter, causing
collisions on the RS-485
line.
Issue the ECHO OFF
command to disable
remote echo.
Intermittent connection
problem between the
transmitter and your
terminal.
Issue the command
again.
Cannot see what you are
typing on the serial line.
Serial line echo not
enabled.
Enable local echo on
your terminal. See
section Terminal
Application Settings on
page 35.
Unable to complete CO
2
adjustment successfully.
Incorrect reference gas
flow.
Retry calibration after
reading section
Calibration and
Adjustment on page 63.
Breathing on transmitter
while using ambient gas
as reference.
Measurement not
stabilized before
attempting adjustment.
Incorrect calibration gas
concentration(s) used for
2-point calibration.