Dwyer 1207A - Manual (Page 7)

1207A manual Page 7
3. BEFORE USING THE ANALYZER EVERY TIME:
Check the water trap is empty and the particle filter is not dirty:
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To empty water trap, unplug its’ rubber stopper and re-plug once it is empty.
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To change the filter, remove protective rubber sleeve, pull out the water trap unit from
the analyzer, remove the water trap’s particle filter from its’ spigot and replace.
Reconnect the water trap and rubber protective sleeve.
Connect the flue probe into the bottom of the analyzer’s water trap and connect the probe’s
temperature plug to the socket next to the water trap – check the plug’s orientation is correct
otherwise incorrect temperature measurements will occur.
After switch on, check fuel source, date and time are correct and battery power is sufficient.
SAFETY WARNING
This analyzer extracts combustion gases that may be toxic in relatively low concentrations.
These gases are exhausted from the back of the instrument. This analyzer must only be used
in well-ventilated locations by trained and competent persons after due consideration of
all the potential hazards.
Sensor manufacturers recommend users of portable gas detectors containing electrochemical
sensors conduct a “bump” check before relying on the unit to verify an atmosphere is free
from hazard.
A “bump” test is a means of verifying that an instrument is working within acceptable limits
by briefly exposing to a known gas mixture formulated to change the output of all the sensors
present. (This is different from a calibration where the instrument is also exposed to a known
gas mixture but is allowed to settle to a steady figure and the reading adjusted to the stated gas
concentration of the test gas.)
For Oxygen monitors a level of confidence that the unit is working adequately may be gained
by exhaling over the sensor inlet and viewing the reduction in reading obtained.