Dwyer Instruments 605 Manuel utilisateur

The Dwyer

Series 605 Magnehelic®Indicating Transmitter simulta-

neously provides local indication on a large, easily read ana-

log scale while also converting that pressure into a standard

two-wire, 4-20 mA signal for ranges from 0-0.5 to 0-50˝

w.c. Positive, negative or differential air and compatible gas

pressure can be measured with an accuracy of ±2% of full

scale. The basic mechanical components of the Series 605

Magnehelic®indicating transmitter are similar to those used

in the popular, time-proven Magnehelic®differential pres-

sure gage. However, the Series 605 models add electrical

conditioning and amplification of a resistance change pro-

duced by a silicon strain gage which is cemented to the

range spring. This resistance change is the result of the

slight flexing which results from spring deflection as pres-

sure is applied to the diaphragm which is directly linked to

the spring.

Series 605 Magnehelic® Differential Pressure Indicating Transmitter

Specifications - Installation and Operating Instructions

Bulletin E-68

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

23/32

[18.26]

[25.40]

30°

1-1/8

[28.58]

(3) #6-32 x 3/16 [4.76]

DP HOLES EQUALLY SPACED

ON A Ø4-1/8 [104.78] B.C.

FOR PANEL MOUNTING

11/16

[17.46]

1/8 FEMALE NPT

LOW PRESSURE

CONNECTION

1/2 [12.70]

1-3/4

[44.45]

1/8 FEMALE

NPT HIGH

PRESSURE

CONNECTION

2-1/16

[52.39]

[50.80]

1-1/4

[31.75]

2-1/2

[63.50] 3/16

[4.76]

5/8 [15.88]

PANEL MAX

Ø5

[127.00]

Ø4-47/64

[ 120.25]

(4) 6-32 HOLES

EQUALLY SPACED ON

A 5-1/8 [130.18] B.C.

FOR FLUSH MOUNTING

Ø4 [101.60]

FACE

5-1/2 [139.70]

O.D. MOUNTING

RING

SPECIFICATIONS

GAGE SPECIFICATIONS

Service: Air and non-combustible, compatible gases.

Wetted Materials: Consult factory.

Accuracy: See chart.

Stability: +1% F.S./yr.

Pressure Limits: See chart.

Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).

Process Connections: 1/8˝ female NPT.

Size: 4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 2-11/16˝

(68.3 mm).

Weight: 1 lb, 12.6 oz (811 g).

Agency Approvals: CE.

TRANSMITTER SPECIFICATIONS

Accuracy: See chart (includes linearity, hysteresis,

repeatability).

Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).

Compensated Temperature Range: 32 to 120°F (0 to

48.9°C).

Thermal Effect: ±0.025% F.S./°F (0.045% F.S./°C).

Power Requirements: 10-35 VDC (2-wire).

Output Signal: 4 to 20 mA.

Zero and Span Adjustments: Protected potentiometers.

Loop Resistance: DC; 0-1250 ohms maximum.

Current Consumption: DC; 38 mA maximum.

Electrical Connections: Screw terminal block.

Mounting Orientation: Diaphragm in vertical position.

Consult factory for other position orientations.

Model

Number

605-00N

605-11

605-0

605-1

605-2

605-3

605-6

605-10

Range

in w.c. Model

Number Range

in w.c.

.05-0-.20

.25-0-.25

0-.50

0-1.0

0-2.0

0-3.0

0-6.0

0-10

605-20

605-30

605-50

605-60Pa

605-125Pa

605-250Pa

605-500Pa

0-20.0

0-30

0-50

Range in Pa

0-60

0-125

0-250

0-500

Maximum

Pressure

25 psi (1.7 bar)

5 psi (34.5 kPa)

Electrical

Accuracy +/-%

0.5

Mechanical

Accuracy +/-%

Maximum

Pressure

20 psi (1.4 bar)

25 psi (1.7 bar)

5 psi (34.5 kPa)

Electrical

Accuracy +/-%

0.5

Mechanical

Accuracy +/-%

Patent No. 4,890,497

STANDARD ACCESSORIES

Mounting ring

Snap ring

(4) 6-32 x 1-1/4 screws (panel mtg.)

(3) 6-32 x 5/16 screws (surface mtg.)

(2) Tubing to 1/8˝ NPT adapters

(2) 1/8˝ NPT plugs

Adjustment key

E-68 8/2/07 8:43 AM Page 1

INSTALLATION

1. LOCATION: Select a location where the temperature of

the unit will be between 20°F and 120°F. Distance from

the receiver is limited only by total loop resistance. See

“Electrical Connections”. The tubing feeding pressure

to the instrument can be run practically any length

required but long lengths will increase response time

slightly. Avoid surfaces with excessive vibration.

2. POSITION: All standard models are calibrated with the

diaphragm vertical and should be used in that position

for maximum accuracy. If your application requires

mounting in other than a vertical position, be sure to

specify this when ordering.

3. PRESSURE CONNECTIONS: For convenience, two

sets of 1/8˝ female NPT ports are available. Plug the

unused set with pipe plugs provided. Attach tubing

from positive pressure source to port marked “HI” or

from negative (Vacuum) source to port marked “LOW”.

In either case, opposite port must be vented to atmos-

phere. In dusty environments, we recommend use of an

A-331 Filter Vent Plug to keep interior of instrument

clean. For differential pressures the higher source is

connected to the “HI” port and lower to the ”LOW” port.

4. MOUNTING: The Series 605 Transmitter may be either

panel mounted or surface mounted.

A. PANEL MOUNTING: Cut a 4-3/4˝ or 120 mm dia.

hole in panel and insert the complete unit from the

front. Slip on the mounting ring and install the split

snap ring in the groove on the bezel. Seat the mount-

ing ring against the snap ring and thread the four

screws through the tapped holes. Tighten screws

against rear of panel.

B. SURFACE MOUNTING: Drill (3) 3/16˝ dia. holes for

mounting screws and cut (1) 7/8˝ x 1-1/8˝ hole for

access to terminal strip as shown in hole location

drawing. Insert screws from rear of panel and thread

into tapped holes on back of transmitter case. If rear

pressure connections are to be used, make 1/2˝ dia.

holes located as shown in hole location drawing in left

column.

5. ZEROING: Once gage/transmitter is mounted in its

final position, check to be sure pointer aligns with zero

on scale, when no pressure is applied and both low and

high pressure ports are vented to atmosphere. To

adjust, turn small slotted screw at center-bottom of

gage face. Do not move the larger black knobs labeled

SPAN and ZERO. These are for use only if a calibration

check shows the 4-20 mA output signal to need adjust-

ment. See page 3 under heading OUTPUT RANGING.

17/32

1-7/8 7/8

1-1/8

30°11/16

21/32

1-3/4

SNAP RING GROOVE

PNEUMATIC PRESSURE TAPS

4-3/4 DIA. HOLE

E-68 8/2/07 8:43 AM Page 2

ELECTRICAL CONNECTIONS

CAUTION: DO NOT EXCEED SPECIFIED SUPPLY VOLT-

AGE RATINGS. PERMANENT DAMAGE NOT COVERED

BY WARRANTY WILL RESULT. THIS UNIT IS NOT

DESIGNED FOR AC VOLTAGE OPERATION.

Electrical connections to the Series 605 Transmitter are

made to the two-screw terminal strip on the rear of the

case. Polarity is indicated by + and – signs stamped on

side. The schematic diagram of the Series 605 transmitter

is illustrated in Figure B.

in series with the current loop but in parallel with the receiv-

er input. Referring to Figure B, RLbecomes the 250 ohm

resistor and point X and Y are connected to the receiver

input, point X being positive (+) and point Y negative (–) or

ground. The resistor should be connected at the panel end

of the transmitter current loop close to the receiver input to

take advantage of the immunity of the current loop to elec-

trical noise pickup. Most electronic component distributors

stock a 249 r, 1/2 watt, ±1% tolerance metal film resistor

which is adequate for this application.

An external power supply delivering 10.0 to 35 VDC with a

minimum current capability of 40 milliamps must be used to

power the control loop in which the Series 605 transmitter

is connected. Refer to Fig. B for connection of the power

supply, transmitter and receiver. The range of appropriate

receiver load resistances (RL) for the power supply voltage

available is given by the formula and graph in Fig. C.

Shielded two wire cable is recommended for control loop

wiring and the negative side of the loop may be grounded

if desired. Note also that the receiver may be connected in

either the negative or positive side of the loop, whichever is

most convenient. Should polarity of the transmitter or

receiver be inadvertently reversed, the loop will not function

properly but no damage will be done to the transmitter.

SERIES 605

PRESSURE

TRANSMITTER

POWER

SUPPLY

10.0-35 VDC

RECEIVER (RL)

SEE FIG. C

NOTE: RECEIVER MAY BE IN

SERIES WITH + OR -

LEG OF CONTROL LOOP

The maximum length of connecting wire between the trans-

mitter and the receiver is a function of wire size and receiv-

er resistance. That portion of the total current loop resis-

tance represented by the resistance of the connecting wires

themselves should not exceed 10% of the receiver resis-

tance. For extremely long runs (over 1,000 feet), it is desir-

able to select receivers with higher resistances in order to

keep the size and cost of the connecting leads as low as

possible. In installations where the connecting run is no

more than 100 feet, connecting lead wire as small as No. 22

Ga. can be used.

The Series 605 transmitters can be used with receivers

requiring 1-5 volt input rather than 4-20 mA. If the receiver

requires a 1-5 volt input, insert a 250 ohm, 1/2 watt resistor

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

05101520 25 30 35 40

RECEIVER RESISTANCE RL()

POWER SUPPLY VOLTAGE - VDC

RL MAX = VPS - 10.0V

20 mA DC

MAXIMUM VALUE (1250)

OPERATING

REGION

OUTPUT RANGING

Each Series 605 Magnehelic®indicating transmitter is fac-

tory calibrated to produce 4 mA at zero scale reading and

20 mA at full scale reading. The following procedure should

be used if the pressure versus output signal relationship

needs to be checked.

1. With unit connected to the companion receiver per pre-

ceding instructions, insert an accurate milliammeter

with a full scale reading of approximately 30 mA in

series with the current loop.

2. Vent both pressure ports to atmosphere and, if neces-

sary, adjust pointer zero screw to align pointer with zero

on scale. A controllable pressure source capable of

reaching the full scale range should be connected to

either high pressure port. Plug the other high pressure

port and vent one or both low pressure ports to atmos-

phere. The instrument must be ranged in the same

position in which it will be used. Standard factory cali-

bration and ranging is done with unit vertical.

3. Apply electrical power to the system and check for

proper operation by slowly increasing pressure and

observing whether the loop current increases above

the 4 mA zero pressure reading.

4. A spanner type key is supplied to adjust span and zero.

This helps to reduce unauthorized tampering. Apply

pressure until pointer aligns with full scale reading and

adjust the SPAN knob for a 20 mA reading.

Figure A

Figure B

Figure C

E-68 8/2/07 8:43 AM Page 3

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

5. Relieve all pressure, allow a few seconds for setting

and adjust the ZERO knob for a 4 mA current loop

reading.

6. The SPAN and ZERO controls are slightly interactive so

steps 4 & 5 should be repeated a few times until read-

ings of 4 and 20 mA are obtained consistently.

7. Remove the milliammeter from the current loop and

proceed with final installation of the transmitter and

receiver.

POWER

SUPPLY

10.0-35

SERIES

605 SERIES

605

Several Series 605 transmitters can be operated with a sin-

gle power supply as depicted above in Figure D. Be care-

ful to specify a supply with sufficient capacity. The minimum

current requirement at a given voltage can be calculated by

multiplying the number of units x 20 mA. In the example

shown this would be 4 x 20 or 80 mA minimum.

MAINTENANCE

Upon final installation of the Series 605 Transmitter and the

companion receiver, including the A-701 Digital Readout,

no routine maintenance is required. A periodic check of

system calibration is recommended. The Series 605

Differential Pressure Transmitter is is not field repairable and

should be returned, freight prepaid, to the factory if repair is

needed (field repair should not be attempted and may void

warranty). Be sure to include a brief description of the prob-

lem plus any relevant application notes. Contact customer

service to receive a return goods authorization (RGA) num-

ber before shipping.

Figure D

MULTIPLE UNITS WITH COMMON POWER SUPPLY

E-68 8/2/07 8:43 AM Page 4

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