Dwyer Series A7 User manual

Dwyer Series A7 User manual
Bulletin IN-A7
Series A7 Mini Pressure Switch
Specifications - Installation and Operating Instructions
By Dwyer
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[Ø4] PRESSURE
CONNECTION
Connection 1
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 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.
MODEL CHART
Example
A7 -1 3 2 1 -10.18 A7-1321-10.18
Series
A7
Mini pressure switch
Switch Type
1
SPDT
2
SPST - NO
Electrical
3
5A @ 125/250 VAC
Rating
5
22A @ 125/250 VAC
Electrical
2
6.35 mm male Q.C. tabs
Connection
Process
1
4 mm tube O.D. push on (side)
Connection
2
1/8˝ male NPT (bottom)
3
1/4˝ male NPT and 4 mm tube O.D. push
on (bottom)
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.
©Copyright 2019 Dwyer Instruments, Inc.
MERCOID
A DIVISION OF
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
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1/4-18 NPT
1/8-27 NPT
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 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.
Printed in U.S.A. 4/19
FR# 443529-00 Rev. 3
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
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