MNA0010, Revision B October 2014
24
2.2 Start-up
2.2.1
Last Check Before Power Up:
Check List ? …..
Are you using the analyzer in an area where there are no flammable vapors?
Avoid exposing the analyzer to rain, dripping water, or hose down?
Installed the power cord and optional wiring?
Ensured gas tight plumbing and external filter installation?
Regulated the sample pressure as instructed?
Read the manual in its entirety?
Flow PPM gas to unit before power up?
YES… then apply power to the unit.
2.2.2 STEP 3 Power Up the unit:
Flush w/ PPM O2
Power Up
LED display segments all illuminate.
Status LEDs blink.
Alarm relays in non-alarm state.
Warm up (~ 100 seconds)
RUN Mode
FIGURE 25 POWER UP DIAGRAM
NOTE: Before powering up the model 7100, it is important to
purge the sensor of ambient air. This will facilitate a quick
initial response to ppm levels of oxygen .
The sensor used in the
model 7100P Portable analyzer is designed for use in PPM
concentrations of oxygen. If the analyzer is powered up while the
sensor is exposed to ambient air, then the sensor will saturate with oxygen and may require
up to 5 minutes recovery time once exposed to trace oxygen gases. To prevent this delay due
to saturation
, you should flow ppm level oxygen (or zero gas) to the sensor before power
up
.
It takes approximately 60 seconds to sweep the sensor out when zero gas is swept through
the analyzer. Then you can apply power to the analyzer. Exposure to air does not affect the
life of the sensor. Exposure to air while the unit is on will slow response.
!