Model 300E Carbon Monoxide Analyzer
Instruction Manual
Getting Started
P/N 04288 REV: A
25
The pin assignments for the Status Outputs can be found in the table below:
Output #
Status
Definition
Condition
1
SYSTEM OK
On if no faults are present.
2
CONC VALID
On if CO concentration measurement is valid.
If the CO concentration measurement is invalid, this bit is OFF.
3
HIGH RANGE
On if unit is in high range of
DUAL
or
AUTO
Range Modes.
4
ZERO CAL
On whenever the instruments ZERO point is being calibrated.
5
SPAN CAL
On whenever the instruments SPAN point is being calibrated.
6
DIAG MODE
On whenever the instrument is in DIAGNOSTIC mode.
7 SPARE
8 SPARE
D
EMITER BUSS
The emitters of the transistors on pins 1-8 are bussed together.
+
DC POWER
+ 5 VDC
Digital Ground
The ground level from the analyzer’s internal DC Power Supplies.
NOTE
Most PLC’s have internal provisions for limiting the current that the input will draw from an
external device. When connecting to a unit that does not have this feature, an external
dropping resistor must be used to limit the current through the transistor output to less
than 50mA. At 50mA, the transistor will drop approximately 1.2V from its collector to
emitter.
4.
If you wish to use the analyzer’s to remotely activate the Zero and Span
calibration modes, several digital Control Inputs are provided via a 10-pin
connector labeled CONTROL IN on the analyzer’s rear panel. Two methods
for energizing the inputs are provided below; the first using the in5V
available on the CONTROL IN connector and the second, if an external,
isolated supply is employed.