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UK Sales Tel: 0845 345 7253
International Tel: +44 1732 861225
PA-604
Issue: 5.8
Date Of Issue: 22/12/2010
© 2010 Sontay Limited. All rights reserved.
Technical Overview
Application (continued)
The PA-604 range are high sensitivity air differential
pressure switches for low differential pressure switching
applications. Suitable for use in air conditioning systems to
provide an indication of fan status or 'filter dirty' condition.
The switching knob is mounted under the cover to avoid
tampering. The scale is individually laser etched for high
accuracy.
Application
If the switch is to be used for filter status monitoring, the
Pitot tube ends should be cut square. If the switch is to be
used for fan status monitoring, the ends of the Pitot tube
should be cut at an angle of 45°.
Duct
Pitot
tube
Fan status monitoring:
The switch can be used across a fan to provide proof of air
flow and hence fan status.
Filter status monitoring:
The switch can be used across a filter to provide dirty filter
status.
Installation
1. The PA-604 should only be installed by a competent,
suitably trained technician, experienced in installation
with hazardous voltages. (>50Vac & <1000Vac or
>75Vdc & 1500Vdc)
2. Ensure that all power is disconnected before carrying out
any work on the PA-604.
3. It is recommended that the unit be mounted vertically,
with the pressure ports pointing downwards (Fig. 1). If
the unit is mounted horizontally (Fig. 2) with the cover
uppermost, the switching points will be 11Pa higher than
the scale reading. If the unit is mounted horizontally
(Fig. 3) with the cover facing downwards, the switching
points will be 11Pa lower than the scale reading.
Fig.1
Fig. 2
Fig. 3
Note
Adjust switch within printed-on scale only!
Fan
- +
Low port High port
High port Low port
Filter
+ -
P2 (low pressure)
P1 (high pressure)
Switching point adjustment
Factory set, do not adjust
