©Copyright MAC Instruments 2005. All Rights Reserved. MAC155 Rev. 12
Pg 3
SENSOR CALIBRATOR
The MAC155 Probe contains an internal calibrator that generates a reference
gas of 40% and 80% of the selected full scale range (Refer to the MAC155
specification sheet). The reference gas can be used to verify the calibration or it
can be used to calibrate the MAC155 Probe at these two points.
The calibrator consists of the following pieces of hardware:
Water Tank
Condenser
Calibration Valve
Calibration Pump
WATER TANK
The water tank holds a supply of distilled water that is used to generate the
water vapor that is in the reference gas stream. The tank holds enough water for
more than a year of normal operation. The water tank has a built in water level
detector that provides a “Low Water” alarm when the water level is low. Refer to
the “OPERATION” section of this manual for information about filling the tank.
Figure 1 – MAC155 Probe Water Tank
Fill Plug
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