Vaisala HMP240 - Manual (Page 113)

HMP240
M210300en Appendix 5: Calculation formulas
111
1. ERROR TYPES
The HMP240 transmitter goes through a self-diagnostics procedure when the
power is switched on. When the procedure does not reveal any errors or faults,
the transmitter starts its normal operation. If errors or faults are found, the
transmitter outputs an error message. Possible error message can also be
checked with command ERRS (see Appendix 1). Note also that if the analogue
current output is selected to be 4 - 20 mA, in case of error the signal drops to 0
mA.
The error messages can be divided into two groups: error messages after reset
and error messages during operation.
LED symbols:
¡
LED dark
¤
LED blinking
l
LED lit
1.1 Errors after reset
Display Serial bus
E11 CPU EEPROM ackn. error
- the CPU hybrid is probably damaged. Send the transmitter to Vaisala for
repair.
E12 CPU EEPROM checksum error
- possibly due to an electrical disturbance an erroneous parameter value or an
incorrect checksum has been stored in the EEPROM. Change any parameter
value (e.g. with command INTV) and give command RESET, or turn the
power off and then on again. If the error message no longer appears, the
transmitter is in order. Should the message re-appear repeatedly, send the
transmitter to Vaisala for repair.