©2008 Ingersoll Rand Company Page 3
There are no adjustments to this pressure
transducer and if problems arise, the transducer
will need to be replaced. Although the
transducer is non-adjustable, it must be
calibrated periodically. Calibrating the
transducer allows the controller to read the
transducers output at zero gauge pressure and
make any corrections in deviation from the 4ma.
This sensor has an accuracy of 0.5%.
Sensor calibration will be discussed later in this
handbook.
3APT [Enh]– This sensor is the same as 4APT
and can be interchangeable however, 3APT
measures the pressure from the wet side of the
sump. Only available with the enhanced
controller option, this transducer is connected to
the controller at terminal XO5 pins 5 and 6.
2ATT [Std] – This 10K ohm NTC (negative
temperature coefficient) thermistor is located at
the airend discharge. This thermally sensitive
resistor increases the resistant value as the
temperature decreases. It is wired into the
controller at terminal XO5 pins 3 and 4. The
thermistor has a range of -34 to 124°C (-29 to
255°F) the following pages shows the
relationship between resistance and
temperature for this thermistor.
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