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Series MP Mini-Photohelic
Specifications - Installation and Operating Instructions
The Series MP Mini-Photohelic
Differential Pressure Switch/Gage combines
®
the time proven Minihelic
II differential pressure gage with two SPDT switching
®
setpoints. The Mini-Photohelic
is designed to measure and control positive, negative,
®
or differential pressures consisting of non-combustible and non-corrosive gases.
Gage reading is independent of switch operation. Switching status is visible by LED
indicators located on the front and rear of the gage.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Differential Pressure Switch/Gage
®
LOW PRESSURE
PORT
HIGH PRESSURE
PORT
3-1/32 [77.00]
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±5% of full scale @ 70°F (21.1°C). Gage face mounted in vertical position.
Pressure Limits: 30 psig (2.067 bar).
Temperature Limits: 20 to 120ºF (-6.7 to 49°C).
Process Connections: Barbed for 3/16˝ I.D. tubing (STD); 1/8˝ male NPT (optional).
Size: 4-1/8˝ (104.78 mm) depth x 3-1/16˝ (77.79 mm) diameter.
Weight: 23 oz (652 g).
SWITCH SPECIFICATIONS
Switch Type: (2) SPDT relays.
Electrical Rating: 5A @ 120/240 VAC Resistive; 5A @ 30 VDC.
Electrical Connections: Screw Type Terminal Block. Accepts 22-12 AWG wire.
Power Requirements: 24 VDC / 24 VAC 50/60 Hz 4 watts.
Mounting Orientation: Gage face in vertical position.
Set Point Adjustment: Push Buttons.
Standard Accessories: (2) mounting screws, (1) .050˝ hex allen wrench.
Agency Approvals: cULus, CE.
Ø2-19/32
[65.88]
3-1/16
1 [25.4]
[77.79]
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: info@dwyermail.com
Bulletin B-37-A
3-1/32 [77.00]
9/32
3-13/16 [96.84]
[7.134]
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Summary of Contents for Dwyer Instruments Mini-Photohelic MP Series
- Page 1 Mounting Orientation: Gage face in vertical position. Set Point Adjustment: Push Buttons. Standard Accessories: (2) mounting screws, (1) .050˝ hex allen wrench. Agency Approvals: cULus, CE. DWYER INSTRUMENTS, INC. Phone: 219/879-8000 www.dwyer-inst.com P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
- Page 2 INSTALLATION 4. Zeroing: Before installation, the Mini-Photohelic may need to be zeroed before ® 1. Location: Select a location free from excessive vibration and where ambient placing into operation. If zeroing is required, you must first remove the zero adjust temperature will be between 20 to 120ºF (-6.7 to 49ºC).
- Page 3 6. Electrical Connections: Refer to Figure C for electrical connections located on 8. Circuit Style: The Mini-Photohelic Switch/Gage is available with several factory ® rear on Mini-Photohelic Switch/Gage: installed optional circuits. They are identified by the label shown in Figure D. This ®...
- Page 4 DE-ENERGIZED, returning to its normal position and in so doing, number before shipping. open the reset terminal S2. The right setpoint relay SP2 would thus be reset and the cycle could repeat. ©Copyright 2020 Dwyer Instruments, Inc. Printed in U.S.A. 2/20 FR# 443249-10 Rev. 6 DWYER INSTRUMENTS, INC.
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