PureAire Monitoring Systems, Inc.
16
3.5 Initial Startup
Once installation of the gas detector has been completed, it is ready for startup. The following
procedures should be performed before putting the instrument into operation:
1.
Check the integrity of all wiring. Confirm the power polarity.
2.
Run any sample tubing from the monitor to the risk site.
NOTE: PureAire recommends the use of polypropylene sample tubing with the
dimensions of 1/4” OD by 3/16” ID. The total length of tubing should not exceed
100 feet.
3.
Apply 24 VDC power to the Power Supply PCB board. The sample pump and pyrolizer heater
will operate.
NOTE: The Air Check requires a regulated 24VDC power supply
CAUTION
-
The pyrolizer insulation temperature is above 150 F and can cause burns if
touched.
The monitor is now ready for power up.
On power up, the monitor will immediately start a 4-minute countdown and the
green and yellow LEDs will be illuminated next to the power connector. It will then display
CH
3
Br
on the top line and
countdown from
244 to 0 and display WARM
on the bottom line. Also the
Yellow Fault LED
will be illuminated on the
front panel.
After the 4-minute countdown, the blue LED will illuminate and
“Pyrolizer Heater Fault”
will scroll on the top line,
F02 00
will display on the bottom line and the
Yellow Fault LED
will still remain illuminated.
Approximately 30 seconds later, the
“Pyrolizer Heater Fault”
and
F02 fault message
and will clear and CH
3
Br will display
on the top line,
a ppm gas
concentration will display on the bottom line of the digital display and the
Yellow Fault LED
will
turn off.
NOTE: After power up, please let the system equilibrate a few hours before making any
zero and span adjustments. The Methyl Bromide sensor may read a high ppm gas
concentration on startup. The sensor’s zero will stabilize during this warm period.
NOTE: The monitor is designed for continuous 24-7 hour operation. Do not power down
the monitor unless you intend to store the monitor. Cycling the monitor on and off will
diminish the performance of the methyl bromide readings.
After the 2 hour warm up, if the monitor is reading a positive PPM, and you are sure that it is not being exposed to methyl
bromide then re adjust the zero.
Refer to section 5.4.3.
3.5.1
Pump Adjustment
The Air Check Methyl Bromide Monitor
has a built in digitally controlled flow controlled sample
pump. The pump flow is set at the factory and should not require adjustment. It has a range to
accommodate tubing lengths up to 100 feet. Flow rate is between 0.5 and 0.9 SCFH. If flow
adjustment is necessary, please contact PureAire.
