Sontay PA-604 Series User manual

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Air Differential Pressure Switch
Page 1 of 3
PA-604
Issue: 5.8
Date Of Issue: 22/12/2010
© 2010 Sontay Limited. All rights reserved.
Features
Specification Product Codes
 Snap fit cover
 Close switching differential
 Duct fixing kit included
 IP65 enclosure kit option
Operating ranges:
Type Adjustmentrange
PA-604-90 20 - 300Pa
PA-604-91 50 - 500Pa
PA-604-92 100 - 1000Pa
PA-604-94 500 - 2000Pa
Max. operating pressure50 mbar (5000Pa)
Pressure connections 6mm ID push-on tubing
P1 = HiP2 = Lo
Electrical rating s 5A (0.8A)/230Vac or 2A @30Vdc
Connections Screw terminals
Dimensions 81mm dia. x 52mm
Housing material Plastic moulding
Fixing Metal mounting bracket
Protection IP54 (IP65 enclosure kit option)
Ambient range -30°C to +85°C
Installation category IEC 664 Category II
Origin Switzerland
PA-604-90
20-300Pa Air differential pressure switch
PA-604-91
50 to 500Pa Air differential pressure switch
PA-604-92
100 to 10000Pa Air differential pressure switch
PA-604-94
500 to 2000Pa Air differential pressure switch
PA-604-90-IP65
IP65 200-300Pa Air differential pressure switch
PA-604-91-IP65
IP65 enclosure kit with fitted pressure switch 50 to
500Pa
PA-604-92-IP65
IP65 enclosure kit with fitted pressure switch 100 to
1000Pa
PA-604-94-IP65
IP65 enclosure kit with fitted pressure switch 500 to
2000Pa
Optional accessories
PA-ADPT
Adaptor bracket for PA930 fixings
PA-DFK
Additional duct fixing kit
PA-TEE
Tee piece pack of 10
PA-TUBE-8mm
PVC Tub, 8mm o/d, 30m reel
Note:
A duct fixing kit is supplied with the PA-930. It consists of
2m of 6mm dia. plastic tubing , 2 x pitot tubes, and 4 x
fixing screws
(Optional PA-ADPT)

Page 2 of 3
UK Sales Tel: [phone] International Tel: [phone]
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

Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury, loss or
expense resulting from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.
Page 3 of 3
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PA-604
Issue: 5.8
Date Of Issue: 22/12/2010
© 2010 Sontay Limited. All rights reserved.
Connections
2 N/C Contact 1Common 3 N/O Contact
CAUTION The PA-604 will be damaged if subjected to
excessive pressure. Do not test the unit by blowing into the
inlet ports.
Dimensions
Dimensions (continued)
1
2
3