IB-106-340
5-2
2. Additional IMPS 4000 Alarm Contacts.
(a)
One contact per IMPS 4000 for “low
calibration gas flowing”.
(b)
One contact per IMPS 4000 for “high
calibration gas flowing”.
NOTE
The 4-20 mA signal can be configured to re-
spond normally during any calibration, or
can be configured to hold the last O
2
value
upon the initiation of calibration. Factory
default is for the 4-20 mA signal to operate
normally throughout calibration. Holding
the last O
2
value may be useful if
several probes are being averaged for the
purpose of automatic control. Unless sev-
eral probes are being averaged, always
place any control loops using the O
2
signal
into manual prior to calibrating.
5-4.
IDENTIFYING AND CORRECTING ALARM
INDICATIONS. Faults in the Oxymitter 4000 are
indicated using the four diagnostic, or unit, alarms.
The pattern of repeating blinks will define the prob-
lem. A condensed table of the errors and the corre-
sponding blink codes can be found on the inside right
cover of the electronics housing. Table 5-1 also
identifies the blink code and fault status of each LED
as well as the output of the 4-20 mA signal line and a
fault number that corresponds to the troubleshooting
instructions provided in this section.
Table 5-1. Diagnostic/Unit Alarm Fault Definitions.
LED
FLASHES
STATUS
4-20 mA LINE
FAULT SELF-CLEARING
HEATER T/C
1
OPEN
Dependent on position 3 of SW2*
1
NO
2
SHORTED
Dependent on position 3 of SW2*
2
NO
3
REVERSED
Dependent on position 3 of SW2*
3
NO
HEATER
1
OPEN
Dependent on position 3 of SW2*
4
NO
2
HIGH HIGH TEMP
Dependent on position 3 of SW2*
5
YES
3
HIGH CASE TEMP
Dependent on position 3 of SW2*
6
YES
4
LOW TEMP
Dependent on position 3 of SW2*
7
NO
5
HIGH TEMP
Dependent on position 3 of SW2*
8
YES
O2 CELL
1
HIGH mV
Dependent on position 3 of SW2*
9
YES
3
BAD
Track O
2
10
YES
4
EEPROM CORRUPT
Dependent on position 3 of SW2*
11
NO
CALIBRATION
1
INVALID SLOPE
Track O
2
12
YES
2
INVALID CONSTANT
Track O
2
13
YES
3
LAST CALIBRATION FAILED
Track O
2
14
YES
**
CALIBRATION RECOMMENDED
Track O
2
YES
* Critical alarm conditions will render the O
2
measurement as unusable, and any of these events will cause the 4-20 mA
signal to go to a user-selectable limit of 4 mA or 20 mA (position 3 of SW2). Factory default value is 4 mA. Alarms
which are not “self-clearing” will require recycling of power to the electronics.
** The CALIBRATION RECOMMENDED alarm flashes the Calibration Recommended alarm LED on the operator’s
keypad.
Summary of Contents for Oxymitter 4000
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