testing of this instrument should be done after about 200 samples have been taken, following long storage periods, or after coming from extreme temperatures, such as hot or cold service vans.
If the CO2, scale is down, two or three drops of water or fresh fluid added to the instrument should bring up the scale fluid to the zero point. If water has been added more than a few times, a test should be performed to establish fluid strength. If the fluid, potassium hydroxide, has gone bad it should
Figure 7 be replaced, Figure 8.
There are two ways to obtain CO2 to establish fluid strength and only one way to confirm this strength:
After taking a sample in the usual way, which requires 18 full depressions of the aspirator bulb, the instrument is inverted
Figure 8 twice, and the test result is recorded. Then
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Figure 9 percent reading rises more than 1 / 2 %, the fluid is becoming weak and should be replaced. In my opinion the instrument should be refurbished with new seals and fluid at least every three years, Figure 9.
NOTE: For a more accurate reading make 18 full depressions of the bulb and one more but don’ t allow the bulb to recompress while you remove the hose from the instrument.
The second method is as follows and is called the exhaled breath test. This should only be done when no equipment sample is available. Disconnect tubing so that connector and short piece of hose, less check valve, can be attached to instrument. Take deep breath, hold for 3 or 4 seconds, depress inlet valve and exhale into instrument. Release inlet plunger at same time while exhaling. Perform double inversion test as in example # l.
Do not perform two tests on exhaled breath for establishing CO2 content. It is an increase in percent CO2, on the one-and-the-
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