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Page 9
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Installation
D023-92-880 Issue F
Figure 3 - Schematic Diagram of Recommended Electrical Connection
3.3.2.1
Set-point
The set-point output is an open-collector transistor with a series diode. When the pressure falls to the set-point
value, the transistor output changes to on (closed or low impedance) and the set-point LED switches on (amber). The
set-point has a fixed hysteresis of 500 mV: the set-point output and LED go off when the pressure rises to 500 mV
above the set-point pressure.
1.
APGX-H electrical connector socket
5.
d.c. relay (optional)
2.
Cable electrical connector plug
6.
Back EMF suppression diode (optional)
3.
Electrical supply
7.
Remote calibration switch (optional)
4.
Voltmeter
5
4
3
6
7
2
1
0V
0V
1
2
3
4
5
6
7
8