APT3700N Smart Pressure Transmitter for Nuclear Service Operation Manual M3700N-K01E
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4.2. Transmitter Operation & Sensor
Duon System Co., LTD's smart pressure Transmitter model APT3700N Series uses a
sensor of 2 different kinds. The first is Capacitance Type sensor and the second is the
Piezo electric Type sensor. These sensors refer to the [Figure 9].
[Figure 9 Sensor Type (Capacitance, Piezoelectric)]
Capacitance Type sensor is being used in the attachment of the certain measurement,
and it is a sensor that has a capacitance of changing sensor. High and Low side of the
equivalent pressure (air pressure included) shows a High, Low each capacitance has
150pF's capacitance. Also High, Low measuring range of the great pressure given is
100pF and has the opposite 300pF's capacitance. These capacitance's surrounding
change sense the pressure variation.
Capacitance Type sensor of the pressure of the linear characteristics perform the sector
work, and have the capacitance type sensor of the sector work as the 1st equation
below of the linearization model, and the 2nd linearization model should be when
manufacturing and producing.
Piezo electric type sensor capacitance type sensor and the following mechanical
energy should change to electric energy, and the Piezoelectric Type sensor is
resistance change in the physical pressure change. The resistance bridge shows the
outer form, and the resistance value is approximately a value of 3.5k ohm(±20%), and
have approximately ±200 ohm's change.
