Vaisala GMT220 - Manual (Page 24)

USER'S GUIDE____________________________________________________________________
24 __________________________________________________________________ M010022EN-F
Error States
The GMT220 series transmitter goes through a continuous self-
diagnostic procedure. If any problems occur, it displays a corresponding
error message. A transmitter without a display indicates errors by
blinking the three LED lights on the cover. Transmitter with a display
indicates error by showing an error code in the display.
In all error cases, check first that the probe is connected properly, then
reset the transmitter by disconnecting it. In case of a constant error,
please contact Vaisala Service Center or a local Vaisala representative
(see sections Technical Support on page 33 and Product Returns
on page 33).
Non-critical and Fatal Errors
There are two types of errors. In case of a non-critical instantaneous
error, the measurement continues and the error code is displayed. If there
is a fatal error, the measurement is interrupted and the corresponding
error code is displayed.
NOTE In a fatal error state, the analog output goes to 100 % (20 mA or 10 V).
Non-critical errors are indicated by the blinking of the green operation
LED light and fatal errors by the red relay LED lights.
If the actual CO
2
concentration is out of the measurement range, the
display and all outputs stop at the highest measured value until the
carbon dioxide concentration in the environment falls back to a
measurable level.