Carbon Monoxide Alarm User Manual

Page 16
(1) Connect the slip-on battery operated pump with the
hose and probe assembly.
(2) Remove the PhD
2
from its protective vinyl carrying
case. Slip the battery-operated pump over the end of
the PhD
2
.
(3) Lightly tighten the retaining screw to secure the
pump to the instrument.
(4) Turn the sample draw pump on. Cover the end of
the sample draw probe assembly with a finger. If
there are no leaks in the sample draw kit
components, the pump should go into a low-flow
alarm and immediately shut down, and the audible
and visual low flow alarms should be activated.
(5) Reset the pump by turning it off and then back on.
(6) Insert the end of the sample probe into the location to
be sampled.
(7) Wait long enough for the pump to have drawn the
sample through the entire length of hose, and for the
sensors to have stabilized. (Allow one additional
second for each foot of sample hose.)
(8) Note gas measurement readings
If a protective pump shut-down occurs, the following
steps should be taken before the instrument is put back
into use:
(1) Turn off the sample draw pump.
(2) Remove the sample draw assembly from the area
being monitored. Be careful to keep the sample draw
probe in a vertical position.
(3) Examine the sample draw probe and hose to make
sure no fluids remain trapped.
(4) Allow any trapped fluids to completely drain. (It may
be necessary to disconnect the hose or sample draw
probe before drainage can occur.)
(5) Replace the sample probe particulate and moisture
barrier filters if necessary.
(6) Turn the pump back on in fresh air and wait for
readings to stabilize.
(7) Continue to sample.
PhD2
Sample draw
Assembly
automatic
sample draw
pump
Retaining screw
Hydrophobic barrier filParticulate filter
Model 1655A
Figure 2.4.2 Model 1655A sample draw pump installation