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Series A7 Mini Pressure Switch
[Ø25.4]
[34.8]
CONNECTION
1/2
1-7/8
1-13/16
1/8-27 NPT
[44.2]
1-7/8
1/4-18 NPT
By Dwyer
Specications - Installation and Operating Instructions
Bulletin IN-A7
1-7/8
[47.4]
Ø1˝
Series A7 Mini Pressure Switch has 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-action switch, which is diaphragm
actuated. They have a silicone diaphragm 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 specication
*Setpoint is factory preset and is not eld 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
specications. The terminals are labeled on the switch itself.
MODEL CHART
Example A7 -1 3 2 1 -10.18 A7-1321-10.18
Series A7 Mini pressure switch
Switch Type 1
Electrical
Rating
Electrical
Connection
Process
Connection
Set Point (psi) 00.00 In the range of 0.25 to 15.0*
*Set points lower than 0.70 psi are only available with electrical rating code 3.
2
3
5
2 6.35 mm male Q.C. tabs
1
2
3
SPDT
SPST - NO
5A @ 125/250 VAC
22A @ 125/250 VAC
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)
1-3/8
1-13/32
[35.56]
[12.7]
[46]
Ø5/32
PRESSURE
[Ø4]
Connection 1 Connection 2 Connection 3
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 nal 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 eld serviceable and should be returned if repair is needed (eld 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.
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MERCOID
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 4/19 FR# 443529-00 Rev. 3©Copyright 2019 Dwyer Instruments, Inc.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
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