Dwyer A7 - Manual

Series A7 Mini Pressure Switch
Specifications - installation and operating instructions
Bulletin in-A7
SPeCiFiCAtionS
Service: Non-hazardous gas or liquid.
Wetted Materials: Silicone and nylon.
temperature limits: 14 to 185°F (-10 to 85°C).
Pressure limits: 50 psig (3.45 bar).
enclosure rating: General purpose.
repeatability: ±10% of setpoint.
Mounting orientation: Switch can be installed in any position.
Weight: 0.04 lb (0.02 kg).
deadband: 0.6 to 0.8 in w.c. (1.5 to 2 mbar).
CAUtion: No lubrication or periodic servicing is required. Mount the
control securely. Never exceed the electrical rating for the switch. Use
the control only with compatible medias.
MAintenAnCe
Upon final installation of the Series A7 Mini Pressure Switch, no routine
maintenance is required. A periodic check of the system calibration is
recommended. The Series A7 is not field serviceable and should be
returned if repair is needed (field repair should not be attempted and
may void warranty). Be sure to include a brief description of the problem
plus any relevant application notes. Contact customer service to receive
a return good authorization number before shipping.
©Copyright 2011 Dwyer Instruments, Inc. Printed in U.S.A. 5/11 FR# R3-443529-00 Rev. 2
MerCoid diViSion
dWYer inStrUMentS, inC.
P.o. BoX 258 • MiChigAn CitY, indiAnA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Series A7 Mini Pressure Switches have been designed for high current
applications. These switches are small and inexpensive, making them
ideal for OEM use. The Series A7 switches utilize a high-quality snap-ac-
tion switch, which is diaphragm actuated. They have a silicone di-
aphragm and nylon housing. The A7 switches are compact and
lightweight which adds to the ease of installation. The set point must be
factory set, but a broad operating range makes them great for a variety
of applications.
Models are built to your specification
*Setpoint is factory preset and is not field adjustable.
Minimum quantity order is 100.
inStAllAtion/MoUnting
The switch can be mounted in any position. Do not twist the case when
installing.
Wiring
All wiring must conform to the National Electrical Code and local
regulations. Do not install the control to handle loads in excess of the
electrical rating shown in the specifications. The terminals are labeled on
the switch itself.
1
1
2
3
1
2
3
4
5
1
1
2
1
1
2
3
00.00
example
Series
Switch type
electrical
rating
electrical
Connection
Process
Connection
Set Point
Model ordering ChArt
A7-2211-10.00
Mini Pressure Switch
SPDT
SPST - NO
0.1A @ 125/250 VAC (gold contacts)
3A @ 125/250 VAC
5A @ 125/250 VAC
16A @ 125/250 VAC
22A @ 125/250 VAC
4.88 mm male Q.C. tabs
6.35 mm male Q.C. tabs
4 mm tube O.D. push on (side)
1/8˝ male NPT (bottom)
1/4˝ male NPT and 4 mm tube O.D. push on (bottom)
In psi. Must be in the range of 0.25 to 15.00 psi. A7
A7
Ш1˝
[Ш25.4]
CONNECTION #1 CONNECTION #2 CONNECTION #3
1-3/8
[34.8]
1-7/8
[47.4]
1/2
[12.7]
1-13/32
[35.56]
Ш5/32
[Ш4]
PRESSURE
CONNECTION
1-13/16
[46]
1/8-27
NPT
1-7/8
[47.4]
1-3/4
[44.2]
1-7/8
[47.4]
1/4-18
NPT