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Teledyne API T802 Paramagnetic O
2
Analyzer Operation Manual
37
STATUS
1 2 3 4 5 6 7
8
D
+
SYSTEM OK
CONC VALID
CAL MODE
SPAN CAL
CAL MODE – RANGE 2
Optional CO
2
CAL
Figure 3-9: Status Output Connector
Table 3-6: Status Output Signals
Rear Panel
Label
Status Definition Condition
1
SYSTEM OK ON if no faults are present.
2
CONC VALID
OFF any time the HOLD OFF feature is active, such as during calibration or when
any faults exist invalidating the O
2
measurement.
ON if concentration measurement is valid.
3
CAL MODE ON whenever the instrument is being calibrated. The Mode field
4
SPAN CAL
ON whenever the instrument’s SPAN point is being calibrated.
5
RANGE2 CAL
ON if unit is in high range of either the DUAL or AUTO range modes.
6
CO
2
CAL
If this analyzer is equipped with an optional CO
2
sensor, this Output is ON when that
sensor is in calibration mode. Otherwise this output us unused.
7 & 8
SPARE
D
EMITTER BUS The emitters of the transistors on Pins 1-8 are bussed together.
+
DC POWER + 5 VDC, 300 mA source (combined rating with Control Output, if used).
Digital Ground The ground level from the analyzer’s internal DC power supplies
3.3.1.6. CONNECTING THE CONTROL INPUTS
If you wish to use the analyzer to remotely activate the zero and span calibration
modes, several digital control inputs are provided through a 10-pin connector
labeled CONTROL IN on the analyzer’s rear panel.
There are two methods for energizing the control inputs. The internal +5V
available from the pin labeled “+” is the most convenient method (Figure 3-10,
left). However, if full isolation is required, an external 5 VDC power supply
should
be used (Figure 3-10, right).
07275B DCN6418