Dwyer Instruments 634ES Series Installation and operating instructions

The Series 634ES Pressure Transmitter senses a single

air, compatible gas or liquid pressure and converts it into

a standard 4-20 mA output signal. Ranges are available

from 0-10 through 0-6000 psi. All models are field

adjustable so any range within these limits can be

achieved by recalibration using the easily accessible

span and zero potentiometers.

Positive pressure can be measured within an accuracy of

±0.5% of span. The Series 634ES uses an isolated

piezoresistive pressure sensor to produce a resistance

change across a wheatstone bridge. The signal is condi-

tioned and converted into a 4-20 mA output signal.

For applications requiring direct pressure or percent of

full span readings, the optional A-701 digital readout

makes an ideal companion device, providing a bright .6”

high, 3-1/2˝ digit LED and supplying power to the Series

634ES Transmitter.

PHYSICAL DATA

GENERAL

Maximum Pressure: See chart on this page.

Wetted Parts: 316, 316L Stainless Steel.

Housing: Designed to meet NEMA-4X.

ELECTRICAL

Power Supply: 12.3-35 VDC-2 wire.

Output Signal: 4-20 mA DC (limited at 38 mA DC).

Loop Resistance: 0 - 1100 ohms from 12.3 to 35 VDC.

RL max =

Current Consumption: DC: 38 mA max.

MATERIALS

Housing: Cast aluminum; textured gray polyurethane

finish.

Pressure Connection: Stainless Steel.

MECHANICAL

Weight: 1 lb., 12 oz. (.8 kg).

Span and Zero Adjustments: Protected potentiome-

ters, located in auxiliary housing.

Pressure Connection: 1/4˝ female NPT x 1/2˝ male

NPT.

PERFORMANCE AT 70°F (21.1°C)

Zero Output: 4 mA DC.

Full Span: 16 mA DC.

Accuracy: ±0.5% of span.

Warm-up Time: 10 minutes.

STABILITY/ENVIRONMENTAL

Operating Temperature: 20 to 120˚F (- 6.7 to 48.9˚C).

Thermal Errors: ±0.02%/˚F typical.

Stability: 1% F.S./yr.

STANDARD ACCESSORIES

(3) “Z” mounting brackets.

(3) 10-32 x 4” RH machine screws.

Series 634ES Pressure Transmitter

Specifications - Installation and Operating Instructions

Bulletin E-69ES

Vps-12.3V

20 mA

Series 634ES Models and Ranges in PSI (bar)

634ES-0

634ES-1

634ES-2

634ES-3

634ES-4

634ES-5

634ES-6

634ES-7

634ES-8

634ES-9

10 (.69)

30 (2.07)

50 (3.45)

100 (6.9)

200 (13.8)

300 (20.7)

500 (34.5)

1000 (69)

2000 (138)

4000 (276)

10 (.69)

20 (1.38)

40 (2.76)

60 (4.14)

100 (6.9)

250 (17.2)

350 (24.1)

600 (41.4)

1250 (86)

2500 (172)

20 (1.38)

40 (2.76)

60 (4.14)

120 (8.3)

250 (17.2)

350 (24.1)

600 (41.4)

1250 (86)

2500 (172)

6000 (414)

30 (2.07)

60 (4.14)

100 (6.9)

200 (13.8)

400 (27.6)

500 (34.5)

1000 (69)

2000 (138)

4000 (276)

7500 (517)

Model Number As Stocked Min. Range Max. Range Max Pressure

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: info@dwyer-inst.com

Lit-By Fax: 888/891-4963

2-1/2 [63.50]

TYP

1-11/16

[42.86]

5-5/16

[134.94]

1/4NPT

1/2NPT

2-7/8 [73.03]

1/16 [1.59]

25/32 [19.84]

03-3/8 [85.73]

3/4 NPT

1-9/16

[39.69]

(3) #10-32 x 1/4 [6.35] DP HOLES

EQUALLY SPACED ON A 2-1/2 [63.50] B.C.

E-69ES (634ES)-4.0 6/26/02 11:05 AM Page 1

INSTALLATION

LOCATION: Select a location where 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 tube feeding the pressure

to the instrument can be run practically any length

required, but long lengths will slightly increase response

time. Avoid surfaces with excessive vibration.

POSITION: A vertical position is recommended, as all

stocked models are spanned and zeroed at the factory in

this position. They can be used at other angles, but final

spanning and zeroing must be done while transmitter is in

the alternative position.

PRESSURE CONNECTIONS: A single pressure connec-

tion is provided at the bottom of the transmitter housing.

It has1/4” female NPT and 1/2” male NPT threads. Attach

positive pressure to this port.

MOUNTING: The Series 634ES Transmitter can be

mounted three ways:

(A) Supported directly by pipe providing pressure.

(B) Attached to a mounting surface with 10-32 x 1/4”

machine screws (included). The machine screws are

installed through the mounting surface into tapped holes

on back of unit.

brackets to tapped holes on back of unit and fasten to

front of mounting surface.

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 634ES Transmitter

are made inside the enclosure. Remove the cover, feed

stripped and tinned leads through the conduit opening

and connect to terminal block screws marked + and -.

See Figure A for locations of terminal block, span and

zero adjust potentiometers. See Figure B (Pg. 3) for

schematic diagram.

FIG. A

An external power supply delivering 12.3 to 35 VDC with

minimum current capability of 40 mA must be used to

power the control loop in which the Series 634ES

Transmitter is connected. See Figure B for connection of

the power supply, transmitter and receiver.

The range of appropriate receiver load resistance (RL) for

the power supply voltage available is given by the formu-

la and graph in Figure C on Pg. 3.

Shielded 2-wire cable is recommended for control loop

wiring, and the cable shielding 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 inadvertent-

ly become reversed, the loop will not function properly,

but no damage will be done to the transmitter.

Series 634ES Pressure Transmitter

Specifications - Installation and Operating Instructions

Bulletin E-69ES

Page 2

E-69ES (634ES)-4.0 6/26/02 11:05 AM Page 2

FIG. B

Series 634ES 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, 2 watt resistor

in series with the current loop but in parallel with the

receiver input. Referring to Figure B, RL becomes the 250

ohm resistor and points X and Y are connected to the

receiver input, point X being positive (+) and point Y neg-

ative (-) 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 electrical noise pickup. Most electronic

component distributors stock a 249 Ω, 2 watt, ± 1% tol-

erance metal film resistor which is adequate for this appli-

cation.

634ES

PRESSURE

TRANSMITTER RECEIVER

SEE FIG. C

POWER

SUPPLY

12-35 VDC

Series 634ES Pressure Transmitter

Specifications - Installation and Operating Instructions

Bulletin E-69ES

Page 3

OPERATING

REGION

MAXIMUM VALUE (1100 )

TOTAL RECEIVER RESISTANCE

Vps-12.3

20mA DC

WIRE LENGTH - The maximum length of wire connect-

ing transmitter and receiver is a function of wire size and

receiver resistance. Wiring should not contribute more

than 10% of receiver resistance to total loop resistance.

For extremely long runs (over 1000 feet) choose receivers

with higher resistances to minimize size and costs of

connecting leads. When wiring length is under 100 feet,

lead wire as small as 22 AWG can be used.

PRESSURE RANGING - Each Series 634ES Transmitter

is factory-calibrated to the range given in the model num-

ber chart. However, special calibration is also available.

If this is the case, the transmitter will be so marked. For

purposes of clarification in these instructions, range is

defined as that pressure which, applied to the transmitter,

produces 20 mA of current in the loop. Zero pressure is

always assumed to be 4 mA. If a transmitter pressure

range other than that supplied is required, follow the re-

ranging procedure described on Pg. 4.

FIG. C

E-69ES (634ES)-4.0 6/26/02 11:05 AM Page 3

PRESSURE RE-RANGING PROCEDURE

1. With the transmitter correctly connected to the com-

panion receiver, an accurate milliameter with a full scale

reading of approximately 30 mA should be inserted in

series with the current loop. A controllable pressure

source capable of achieving the desired range should be

connected to the pressure port of the transmitter and teed

into an accurate reference pressure gauge or manometer.

The instrument must be ranged in the same position in

which it will be used. Vertical mounting is recommended.

2. Apply electrical power to the system and allow it to

stabilize for 10 minutes.

3. With no pressure applied to the transmitter, adjust

“zero” control so that loop current is 4 mA.

4. Apply full range pressure and adjust loop current to 20

mA using “span” control.

5. Relieve pressure and allow transmitter to stabilize for

two minutes.

6. Zero and span adjustments may be interactive, so

repeat steps 3 through 5 until zero and full range pres-

sures consistently produce loop currents of 4 and 20 mA

respectively.

7. Remove the milliameter from the current loop and pro-

ceed with final installation of the transmitter and receiver.

MULTIPLE RECEIVER INSTALLATION

An advantage of the standard 4-20 mA output signal pro-

vided by the Series 634ES Pressure Transmitter is that

any number of receivers can be connected in series in the

current loop. Thus, an A-701 Digital Readout Accessory,

an analog panel meter, a chart recorder, process control-

ling equipment, or any combination of these devices can

be operated simultaneously. It is only necessary that

these devices all be equipped with a standard 4-20 mA

input and that proper polarity of the input connections be

observed when inserting the device in the current loop. If

any of the receiving devices displays a negative or down-

scale reading, this indicates that the signal input leads are

reversed.

MAINTENANCE

Upon final installation of the Series 634ES 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

634ES Pressure Transmitter is not field serviceable and

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

is required. The A-701 Digital Readout should be

returned to the manufacturer if service is needed. Refer

to the A-701 instruction sheet.

Series 634ES Pressure Transmitter

Specifications - Installation and Operating Instructions

Bulletin E-69ES

Page 4

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: info@dwyer-inst.com

Lit-By Fax: 888/891-4963

E-69ES (634ES)-4.0 6/26/02 11:05 AM Page 4

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