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SENS ORS PRESSURE SENSOR 31.14 Technical Reference Manual Chapter Iss ue 2 Oct 06 PRESSURE SENSOR Descriptio n The pressure sensor switch is wired as a normally open (NO) switch whi ch is closed by the air pressur e exce…

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SENSORS
MICROSWITCH SENSOR
Chapter Issue 2 Oct 06 Technical Reference Manual 31.13
MICROSWITCH SENSOR
Description The microswitch sensor used is a solid state microswitch with no mechanical
contacts. The plunger operates a Hall effect sensor triggering the transistorized
output.
Figure 31-14 Microswitch Sensor and Schematic
Testing/
Adjustment
Testing can be carried out with the microswitch in circuit by measuring the
voltage between pin 2 (signal) and pin 3 (0V), Voltage Diagram figure below,
refers.
Figure 31-15 Voltage Diagram
Digital Input
V+ (User)
Opto-isolator
1K8
0V
Squeegee/ProFlow Home Microswitch
o
+
-
s
Voltage
Regulator
Trigger
Circuit
and
Amplifier
Hall Effect
Sensor
Block Diagram of Microswitch
1
2
3
Switch Position
Released Depressed Released
12V
0V
Voltage
Output at
Pin 2 (signal)
SENSORS
PRESSURE SENSOR
31.14 Technical Reference Manual Chapter Issue 2 Oct 06
PRESSURE SENSOR
Description The pressure sensor switch is wired as a normally open (NO) switch which is
closed by the air pressure exceeding the set point.
Figure 31-16 Pressure Sensor Schematic
Digital Input
V+ (User)
Opto-isolator
1K8
0V (User)
12V
0V
Pressure Sensor Symbol
Pressure Sensor and Gauge
P
Common
NC
NO
SENSORS
PRESSURE SENSOR
Chapter Issue 2 Oct 06 Technical Reference Manual 31.15
Testing/
Adjustment
For adjustment refer to the Pneumatic Module Chapter.
The sensor may be tested either in circuit or disconnected:
In circuit -
• Monitor the voltage at signal DIG IN 0 whilst increasing the pressure from
zero using the main regulator. As the air pressure exceeds the set point
value the voltage is pulled down to 0V.
Disconnected -
• Measure continuity across the switch whilst increasing the pressure from
zero using the main regulator. As the air pressure exceeds the set point
value the contacts close.
Figure 31-17 Pressure Diagram
Indicated
Pressure
12V
0V
Open
Circuit
Closed
Circuit
Open
Circuit
Set Point
Contact
Continuity
Digital I/P
Signal
5
3
bar
0