Honeywell 5701 Operating Instructions Manual page 152

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 5 - COMMISSIONING AND
MAINTENANCE INSTRUCTIONS
Error
Code
83
82
81
Error Code Meaning
Current Setting Fault (Catalytic Sensors
Only)
The current setting fault message is
displayed when the control card is unable to
set or maintain the correct operating current
for a catalytic sensor.
Check the sensor connection and cable line
lengths to ensure that the maximum line
impedance has not been exceeded.
Lifetime Expired
The lifetime expired message is displayed if
the catalytic sensor sensitivity falls to below
50% of its original value.
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.
5 - 13
5701 Control System
S/W Card Fault
Status Signal
2Vx Non Yes
Only Active
All Active No
All Non Yes
Active
Latch
Yes
No
Conf