Chapter 3 Detailed Operating Instructions
21
Biased Sensors
NO, NH
3
and ETO are biased sensors. It is recommended that the
bias be maintained at all times. If sensor power is not maintained,
a stabilization period of at least 2 to 3 hours may be required.
The IAQ Monitor will supply power to a connected biased sensor,
even when it is turned off. This maintains the sensor in a ready to
use state with no stabilization period required. If a biased sensor
will not be connected to the IAQ Monitor at all times, a bias box
(part # bb-7400) may be purchased, which will supply power for up
to 4 biased sensors. This will keep the sensor(s) in a ready to
operate condition.
The amount of time it takes a biased sensor to stabilize when it is
disconnected from its power source depends on the length of time it
is unpowered. If the sensor is removed for several minutes, it may
take 20 minutes or longer for the sensor to stabilize.
To use a biased sensor that has been powered with the bias box,
disconnect the sensor from the bias box and immediately connect
the sensor to the IAQ Monitor and turn on the IAQ Monitor. The
sensor should stabilize in a few minutes.
IMPORTANT: You must
turn on the IAQ Monitor after connecting a
biased sensor or sensor power will
not
be maintained. After initial
turn on, the IAQ Monitor can be turned off and the bias will still be
maintained.
IMPORTANT: You must use Quest Suite Professional to program
the IAQ Monitor to display and record on the gas channel.
Installing a Gas Sensor
Follow these steps to connect a gas sensor to the IAQ Monitor:
1. With the IAQ Monitor turned off, unscrew and remove the toxic
sensor cap from the wand (see the instrument diagram at the
beginning of this chapter).
2. Once the sensor cap is removed, you will see a circuit board
with a white outline. Line up the outline of the gas sensor with
the white outline on the circuit board.
3. Push the sensor's pins into the socket pins of the circuit board
until fully seated.
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