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Getting Started Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 41
3.3.4. 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. However, if full isolation is required, an external 5 VDC power supply should be
used.
CONTROL IN
A B C D E F U
+
LOW SPAN
ZERO
CONTROL IN
A B C D E F U
+
LOW SPAN
ZERO
-
+
5 VDC Power
Supply
Local Power Connections
External Power Connections
CAL HIGH RANGE
CAL HIGH RANGE
Figure 3-9: Control Input Connector
Table 3-6: Control Input Signals
INPUT # STATUS DEFINITION ON CONDITION
A
REMOTE ZERO CAL
The analyzer is placed in Zero Calibration mode. The mode field of the
display will read ZERO CAL R.
B
REMOTE SPAN CAL
The analyzer is placed in span calibration mode as part of performing a low
span (midpoint) calibration. The mode field of the display will read LO CAL
R.
C
REMOTE CAL HIGH
RANGE
The analyzer is forced into high range for zero or span calibrations. This
only applies when the range mode is either DUAL or AUTO. The mode field
of the display will read HI CAL R.
D, E
& F
SPARE
Digital Ground
The ground level from the analyzer’s internal DC power supplies (same as
chassis ground).
U External Power input Input pin for +5 VDC required to activate pins A – F.
+
5 VDC output
Internally generated 5V DC power. To activate inputs A – F, place a jumper
between this pin and the “U” pin. The maximum amperage through this port
is 300 mA (combined with the analog output supply, if used).