AQ COMFORT Instruction & Operations Manual
Version 1.01
Page 27 of 44
Make sure the concentration of the calibration gas is within the range of each
sensor. Do not use gas that could over-range the sensor.
For greatest accuracy, it is recommended that you use a span gas value close to
the gas concentration you expect to measure.
C. CALIBRATION APPARATUS
During calibration an adequate flow of span gas must be supplied without developing
excessive pressure on the sensors. A compressed cylinder of span gas must be
equipped with a primary pressure regulator. Connect the regulator of the bottled gas to
the AQ Comfort “A” inlet in the center port on the bottom of the unit. A simple way to
feed the span gas to your monitor is by an open T-connection that will ensure that gas is
fed at ambient pressure. The regulator valve is used to control the flow of gas to the
monitor. To ensure that the span gas is fed properly and as efficiently as possible,
connect a bypass flow-meter at the outlet. Adjust the regulator to maintain
approximately 750 cc/min of flow at the outlet.
You must not feed gas to the AQ COMFORT under pressure and you must not starve
the AQ COMFORT's pump for gas. When feeding the gas, you must maintain a
reasonably constant pressure, near ambient pressure.
