Connection Board
The termination or connection board consists of alarm relay and DC-DC power
converters for the transmitter board and the sensor. The power converters are
protected against reverse polarity.
A 3 pin terminal is provided for user interface to the monitoring device for power
input and 4-20ma output. A three (3) Pin terminal block is also used for alarm
connections. Each pin on alarm terminal block is labeled as C (common), NC
(normally closed) and NO (normally open). See Figure 3.
The 4 pin terminal at the bottom of the board is labeled SENSOR. Four (4) wires
from the sensor head assembly are connected to this terminal.
These wires are connected as follows:
R Red wire (Sensor Positive 5 VDC Supply)
G Green Wire (Sensor Ground)
W White Wire (Sensor signal out) and
B Black wire (Sensor -5VDC Supply)
Note:
Oxygen sensor head has only 2 wires (Black and white). Thus only these 2 wire
connections are required
For proper operation these wires must be connected as noted above.
PT295 Series Toxic Sensor Rev 5.1
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