Teledyne API – Model T300/T300M CO Analyzer
Getting Started
43
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
other faults exist possibly invalidating the current concentration measurement
(example: sample flow rate is outside of acceptable limits).
ON if concentration measurement is valid.
3
HIGH RANGE
ON if unit is in high range of either the
DUAL
or
AUTO
range modes.
4
ZERO CAL
ON whenever the instrument’s
ZERO
point is being calibrated.
5
SPAN CAL
ON whenever the instrument’s
SPAN
point is being calibrated.
6
DIAG MODE
ON whenever the instrument is in
DIAGNOSTIC
mode.
7
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 is unused.
8
O
2
CAL
If this analyzer is equipped with an optional O
2
sensor, this Output is ON when that
sensor is in calibration mode.
Otherwise this output is unused.
D
EMITTER BUS
The emitters of the transistors on pins 1-8 are bussed together.
SPARE
+
DC POWER
+ 5 VDC, 300 mA source maximum.
Digital Ground
The ground level from the analyzer’s internal DC power supplies.
3.3.1.6.
CONNECTING THE CONTROL INPUTS
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 in5V available
from the pin labeled “+” is the most convenient method. However, if full isolation is
required, an external 5 VDC power supply should be used.
06864D DCN7562
Summary of Contents for T300
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