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Part No. 715-0088, Rev. B
- 40 -
3.10.17.
Temperature / Pressure Dependence
The output of an Oxygen cell varies slightly with gradual changes in
temperature, but when exposed to a step change in temperature, these sensors
exhibit a transient response - a signal decrease for a sharp rise in temperature
and a signal increase for a sharp drop in temperature. The temperature
transient will diminish in about 20 seconds.
Oxygen cells will give a transient response to step changes in pressure - a
signal increase for increased pressure and a signal decrease for decreased
pressure. This transient will disappear after about 8 - 10 seconds. Mechanical
shock may also cause the sensors to give a temporary increase in signal.
3.10.18.
Oxygen Concentration vs. Humidity
Prolonged periods of operation in either extremely high, or extremely low,
relative humidity will have little effect on the sensors. Changes in relative
humidity of a gas sample will affect the volume % concentration of oxygen, and
therefore the output of a cell due to the dilution effect caused by increasing
water vapor pressure. The current given by Oxygen cell is only affected
inasmuch as the concentration of oxygen varies.
In conditions where liquid condensation may occur, liquids may form in the
region of the gas access hole, which will restrict the flow of gas to the sensor,
resulting in a low signal. If a sensor shows signs of being affected by
condensation, drying the sensor with a soft tissue may restore normal
operation. Under no circumstances should the sensors be heated above 40 C
to dry them.
3.10.19.
Oxygen Cell Handling Precautions
Oxygen cells are relatively insensitive to mishandling and following the simple
guidelines given below should ensure correct operation.
Oxygen sensors may be stored for up to six months during which time
they should be kept sealed in the containers in which they are supplied
in clean dry air at 0 - 20 C.
Do not store sensors in areas containing solvent vapors, as exposure to
organic solvent vapors may inhibit their performance.
Oxygen sensors must not be subjected to any pressure when handling
or clamping.
At the end of its life, please dispose of the cell properly as it contains a
small amount of lead.
3.11. Mass Flow Meter Circuit
The mass flow meter (MFM) circuit operates when the unit is powered on. The
flowmeter produces a ratiometric analog output voltage of 0.5 V - 4.5 V over the full span
of 0-2 L/min. The signal is offset and amplified before being interpreted by the
processors onboard Analog to Digital converter.
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