III. NORMAL OPERATION
After the desired equilibrium has been achieved, the instrument may be
used to perform gas calibration. The GREEN LEDs will continue to flash
ever 4 seconds indicating remaining cell life. While in normal operating
mode, the CAL-101 will run continuously and generate gas until either the
battery becomes discharged or the cell is consumed. (In the bump station
configuration the unit will run for thirty seconds then automatically turn off)
If the cell is consumed the green LEDs will 'ramp' max to min repeatedly
indicating the need for cell replacement. When this occurs, please refer to
the Non-Normal Operation section that follows.
Note: Changes in air pressure or temperature will affect the output of
the CAL-101 instrument. Before beginning any calibration please refer
to section VI. CORRECTIONS TO VOLUMETRIC FLOW- for important
adjustments needed to obtain accurate calibration gas.
The calibration gas is delivered through the calibration hose attached to the
CAL-101 via a quick connect coupling. A calibration adapter, or cup, which
is provided by the manufacturer of your gas detector, is usually attached
to the end of the delivery hose. This adapter or cup is then placed over
the gas sensor. Be sure not to restrict or block the delivery hose while the
pump is running. This method is used for calibrating diffusion type sensors.
Alternatively, the output gas may be collected into a gas collection bag
for calibrating sample draw instruments. If this method is used, it is
recommended that the instrument is allowed to flow into and out of the bag
via a “Y” connector. First, partially fill the bag with generated gas. Second,
attach the sample draw unit to the third side of the “Y” connector. The
sample draw instrument will draw from both the generator and/or the bag
depending upon the flow rate of the generator. Be sure to disconnect the
sample draw unit before the bag is completely emptied of gas.
An alternative method is to connect the “Y” adapter directly to the instrument
with no bag attached. This should only be used if the flow rate of the CAL-
101 is greater than that of the sample draw instrument, otherwise dilution
gas will also be drawn into the instrument reducing the calibration gas
concentration.
NOTE: Never attach a sample draw instrument directly to the end of
the CAL-101 delivery hose without a “Y” connector in between the two
instruments. This may cause damage to one or both of the air pumps
in the CAL-101 and/or sample draw instrument.
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