Dwyer Instruments MP Mini-Photohelic Bedienungsanleitung

Series MP Mini-Photohelic®

Differential Pressure Switch/Gage

Bulletin B-37-A

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

Specifications - Installation and Operating Instructions

The Series MP Mini-Photohelic®differential pres-

sure 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-com-

bustible 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.

SPECIFICATIONS

GAGE 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: UL, cUL.

3-13/16 [96.84]

3-1/32 [77.00]

23/64 [36.51]

Ø2-19/32

[65.88]

%%3-1/16

[77.79]

1 [25.4]

3-1/32 [77.00]

HIGH PRESSURE

PORT

LOW PRESSURE

PORT

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INSTALLATION

1. Location: Select a location free from excessive

vibration and where ambient temperature will be

between 20 to 120ºF (-6.7 to 49ºC). Pressure sensing

lines may be any length necessary without affecting

accuracy. However, long runs of tubing will dampen

readings slightly and cause an increase in response

time. If pulsing pressure or vibration cause excessive

pointer oscillation please contact factory for ways to pro-

vide additional damping.

2. Position: The Mini-Photohelic®is calibrated and zeroed

with gage face in the vertical position at the factory. If the

gage is used in any other position, it must be re-zeroed

each time the position is changed. Gages with ranges

under 5 in. w.c. (1.24 kPa), or equivalent, should be

used only in the vertical position unless special calibra-

tion was specified when ordering.

3. Mounting: The Mini-Photohelic®is normally mounted

before making electrical connections. Terminal blocks

are located on the rear of the gage for electrical connec-

tions.

(A) Panel Mounting: Standard installation for the Mini-

Photohelic®mounting is flush through a panel.

Allow approximately 1˝ clearance for pressure tub-

ing and electrical wiring. cut a 2-5/8˝ (66.68 mm)

diameter hole in the panel. Insert the Mini-

Photohelic®into the panel, thread #6 mounting

screws into the mounting lugs and tighten.

4. Zeroing: Before installation, the Mini-Photohelic®may

need to be zeroed before placing into operation. If

zeroing is required, you must first remove the zero

adjust plug, located near the bottom face of the gage,

with a small blade screwdriver. (refer to Fig B.) The

zero adjust screw is located directly behind the plug.

Use the hex allen wrench supplied and adjust until the

pointer is on zero. This must be done with both pres-

sure connections vented to the atmosphere and the

gage oriented in the final mounting position. Replace

plug. Caution must be taken not to overtighten the

plastic plug when repluging.

5. Pneumatic Connections: To measure positive pres-

sure, connect tubing to port marked “+” and vent “–”

port to atmosphere. For negative pressure (vacuum),

connect to port marked “–” and vent “+” port to atmos-

phere. If gage is supplied with 1/8˝ male NPT connec-

tions careful attention must be made not to over-tight-

en fittings to avoid damage to the gage.

1 (25.40)

LOW PRESSURE PORT

HIGH PRESSURE PORT

2-19/32

(65.88)

3-1/16

(77.79)

1-7/16

(36.51)

2-3/8

(60.33) 23/64

(9.13)

1-15/16

(49.21) 11/64

(4.37)

5/32 (3.97)

MOUNTING HOLE

TYP 4 PLACES

2.276 (57.81) TYP

2-11/16 (68.26) SQ

Fig. A

ZERO ADJUST PLUG

Fig. B

PANEL MOUNTED

#6 MOUNTING

SCREW

MOUNTING

LUG

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6. Electrical Connections: Refer to Fig. C for electrical

connections located on rear on Mini-Photohelic®

Switch/Gage:

S1→SP1 Reset Terminal (Do not apply power)

S2→SP2 Reset Terminal (Do not apply power)

Vs→24 VDC / 24 VAC 50/60 HZ

NO1→SP1 Relay N.O. Contact

C1→SP1 Relay Common Contact

NC1→SP1 Relay N.C. Contact

NO2→SP2 Relay N.O. Contact

C2→SP2 Relay Common Contact

NC2→SP2 Relay N.C. Contact

Section A contains external connections to the holding

circuit for manual reset applications. The function and

use of these connections varies somewhat depending on

the circuit style of the instrument. See steps 7 and 9 for

details.

Caution: Do not apply electrical current to

terminals in Section A.

Section B contains the power connections for the control

unit. Standard unit is designed to operate on 24 VDC / 24

VAC 50/60 HZ.

Caution: Do not apply 120 / 240 VAC to the power

connections.

Section C contains connections for SP1 and SP2 relays.

Connections are marked on the rear of the instrument.

7. Setpoint Calibration: Setpoint calibration is easily

attained by actuating the pushbuttons located on the

rear of the instrument. Pushbuttons are labeled SP1

and SP2. To set the setpoint SP1, apply pressure

where you require the SP1 relay to energize. Press

pushbutton marked SP1 on the rear of the instrument,

SP1 LED located on the front and rear of the instru-

ment will flash several times. When LED stops flash-

ing calibration is complete. Repeat the same steps

above for SP2 relay.

8. Circuit Style: The Mini-Photohelic®Switch/Gage is

available with several factory installed optional cir-

cuits. They are identified by the label shown in Fig. D.

This label is mounted on the upper side of the main

pressure housing.

The letter H denotes a circuit in which the relay can be

made to latch or remain energized after pressure

increases above its setpoint.

The letter L denotes a circuit in which the relay can be

made to latch or remain de-energized after pressure

decreases below its setpoint.

Two letters are required to fully identify a dual setpoint

unit. Thus, circuit style HH, which is standard, is a dual

setpoint circuit which has provisions for latching on

pressure increase to either setpoint. Circuit styles may

be used with either setpoint stated above.

9. Dual Setpoint Automatic Reset: Circuit style HH is

used for simple on-off switching applications. To place

in service, connect load circuits to the appropriate ter-

minals in Section C (Fig. C) for SP1 relay and SP2

relay. No connections are required in Section A.

SECTION A

SECTION B

SECTION C

–

Fig. C

Fig. D

Sectio

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10. Dual Setpoint Manual Reset: Circuit style HH may

also be used for manual reset applications where it is

required to maintain contact on either relay following

pressure increase above its setpoint. Load or signal

connections are made to the appropriate terminals in

Section C (as in step 8). Connect terminals in Section

A through normally closed switches or pushbuttons as

shown in Fig. E. Use “dry-circuit” type switches such as

Dwyer Part No. A-601 with palladium, gold, etc. or

rotary wiping action type contacts is recommended.

Circuit style LL is used for manual reset applications

where it is required to maintain contact on either relay

following pressure decrease below the setpoint. Load

or signal connections are made to the appropriate ter-

minals in section C (as in step 8). A normally open type

manual reset switch such as Dwyer Part No. A-601 is

connected to the terminals in Section A. The circuit

must be “armed” by momentarily energizing the switch

while the pointer is to the right of the setpoint. From

that point on, the circuit will latch on pressure decrease

below the setpoint and remain latched on pressure

increase until manually reset with the optional switch.

11. High Low Limit Control - Dual Setpoint: Standard

circuit style HH may be used to control various fans,

dampers, pumps, etc..., between the setpoints of a

Mini-Photohelic® Switch/Gage. To accomplish this, use

one setpoint relay to reset the other as shown in the

wiring diagram Fig. F. In this typical application, the

load would be connected to the N.C. contacts (NC2) of

the right setpoint relay SP2. The N.O. contacts of SP1

relay would be connected to the S2 reset terminals on

the rear of the instrument. On pressure rise to the right

setpoint relay SP2, the relay would pull-in and hold

even though the pressure might fall below that set-

point. If the pressure continued to fall to the left of set-

point SP1, then SP2 relay would be automatically DE-

ENERGIZED, returning to its normal position and in so

doing, open the reset terminal S2. The right setpoint

relay SP2 would thus be reset and the cycle could

repeat.

12. Dual Setpoint Special Purpose Circuits: Circuit

Style LL may be used where manual reset following

maintained contact on pressure decrease to either set-

point is required. Circuit HL and LH are combination

units. For special combinations of features and special

units consult factory.

13. Failure Mode: The Mini-Photohelic®circuit design pro-

vides certain protection in the event of a loss of electri-

cal power. Both relays will de-energize upon loss of

power.

MAINTENANCE AND SERVICE

Dwyer Mini-Photohelic®Switch/Gages are precision

instruments, expertly assembled and calibrated at the fac-

tory. They require no lubrication or periodic servicing. If

the interior is protected from dust, dirt, corrosive gases

and fluids, years of trouble-free service may be expected.

Zero adjustment should be checked and reset occasional-

ly to maintain accuracy.

Upon final installation of the Series MP Mini-Photohelic®

Differential Pressure Switch/Gage and the companion

receiver, no routine maintenance is required. A periodic

check of the system calibration is recommended. The

Series MP 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 descrip-

tion of the problem plus any relevant application notes.

Contact customer service to receive a return goods autho-

rization number before shipping.

RESET

–

Fig. E 24 VDC/VAC

LOAD

–

Fig. F

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

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