Honeywell 5704 Operating Instructions Manual page 133

MAN0448_Issue 13_ 01-2010
005704-M-5001 A03249
CHAPTER 5 - COMMISSIONING AND
MAINTENANCE INSTRUCTIONS
Error
Code
81
80
Error Code Meaning
The lifetime is calculated on the difference
between the sensitivity measured during 1st
SPAN and that measured during subsequent
normal SPANs, and is only updated during
the SPAN function.
This is a warning that the sensor output is
becoming unacceptably low and may be due
to age or due to the sensor being 'poisoned'
by the presence of silicones, sulphur and
lead compounds.
The sensor should be replaced.
Signal Under Range
The signal under range message is displayed
when the sensor signal reading is less than a
predetermined level held within the channel
configuration data. This predetermined level
is below the normal operating range.
This is typically due to the sensor signal
drifting below the normal zero operating
point. This could, depending on the sensor
type, be due to large changes in climatic
conditions, loose terminal connections, the
sensor being poisoned or an early indication
of the failure of the sensor.
In some instances this error can be caused
by short circuits in the sensor or cabling.
The channel card should be calibrated and
its operation checked
Signal Over Range
The signal over range warning message is
displayed when the sensor signal reading
is more than a predetermined level held
within the channel configuration data.This
predetermined level is above the operating
range.
5-12
5704 Control System
Software Card Fault latch
Version Status Signal
All Non Yes
Active
All Active No
Conf
Conf