Dwyer Instruments 685 Series Manuel utilisateur

Series 685 Differential Pressure

Transmitter

Specications - Installation and

Operating Instructions

Bulletin P-685

The Series 685 Differential Pressure

Transmitter is used to measure differential

pressure and vacuum. The adjustable

pressure range and output signal make

it the ideal choice for installers and

maintenance professionals. It has a user-

congurable response time via a jumper

and can be mounted in any orientation.

Applications include building automation

systems, clean room monitoring, valve

and ap control, lter monitoring, and air

ow control. It has an adjustable pressure

range, a single button to zero, and can be

reset to factory settings with a long button

press. No additional reference pressure

sources or separate calibration devices

are necessary.

15 MM AF

0.787 [20.0]

0.217 [5.5]

0.374 [9.5]

1.772

[45.0]

1.614

[41.0]

1.102 [28.0]

0.236 [6.0]

2.598 [66.0]

0.118

[3.0]

0.098

[2.5]

0.472 [12.0]

1.083

[27.5]

0.866

[22.0]

0.394 [10.0]

P +P -

BENEFITS/FEATURES

• Cost effective and compact device

suitable for OEM applications where

space, simplicity, and value are key

• Single button to zero saves maintenance

time

• Factory restore to defaults with a long

button press

• User-adjustable response time provides

versatility for many applications

APPLICATIONS

• Building automation, air-conditioning and

clean room technology

• Valve and shutter control

• Filter, ventilator and fan monitoring

• Air-ow control

4-20 mA Output Wiring

Voltage Output Wiring

MAINTENANCE/REPAIR

Upon nal installation of the Series 685,

no routine maintenance is required. The

Series 685 is not eld serviceable and is

not possible to repair the unit. Field repair

should not be attempted and may void

warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sale” in

our catalog and on our website. Contact

customer service to receive a Return

Materials Authorization (RMA) number

before shipping the product back for repair.

Be sure to include a brief description of the

problem plus any additional application

notes.

Printed in U.S.A. 5/22

FR# 444682-00

2-WIRE

4... 20 mA

18... 30 VDC

LOAD

3-WIRE

GND

0... 10 V

18... 30 VAC

LOAD

0-10 V

U [V]

10.5 V

-50 050 100 p [%]

0.0 V

4-20 mA

I [mA]

21 mA

-50 050 100 p [%]

3.8 mA

DWYER INSTRUMENTS, INC

P.O. BOX 373

MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000 Fax: 219-872-9057

dwyer-inst.com

e-mail: [email protected]

DWYER INSTRUMENTS, INC

P.O. BOX 373

MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000 Fax: 219-872-9057

dwyer-inst.com

e-mail: [email protected]

MODEL DEPENDENT SPECIFICATIONS

Model

Pressure

Range Over Pressure

Burst

Pressure

Additional error with

temperature [% FS/10°C]

685-00(-V)

685-01(-V)

685-02(-V)

685-03(-V)

685-04(-V)

685-05(-V)

685-06(-V)

685-07(-V)

685-08(-V)

685-09(-V)

685-10(-V)

685-11(-V)

685-12(-V)

685-13(-V)

1 in w.c.

2 in w.c.

3 in w.c.

5 in w.c.

10 in w.c.

15 in w.c.

20 in w.c.

25 in w.c.

40 in w.c.

250 Pa

750 Pa

1250 Pa

2500 Pa

5000 Pa

60 kPa

75 kPa

85 kPa

60 kPa

75 kPa

85 kPa

100 kPa

125 kPa

135 kPa

100 kPa

125 kPa

135 kPa

± 0.7

± 0.5

± 0.3

± 0.7

± 0.5

± 0.3

SPECIFICATIONS

Service: Air and non-corrosive gases.

Sensor Type: Piezoresistive pressure sensor.

Output Signal: 2-wire: 4-20 mA; 3-wire: 0-10 V.

Supply Voltage: 2-wire: 18-30 VDC; 3-wire: 18-30 VAC/DC.

Loop Resistance: 2-wire: 500 Ω max; 3-wire: ≥ 1 kΩ (≤ 10 mA).

Maximum Current Draw: 2-wire: 21 mA; 3-wire: 40 mA.

Accuracy*: ≤ ±0.5% RSS (BFSL), ± 1Pa.

Thermal Effects*: See model-dependent specications table.

Long-Term Stability*: ≤ ±1% FS per year.

Temperature Limits: -4 to 158°F (-20 to 70°C).

Humidity Limits: 0 to 95% RH, non-condensing.

Response Time: 1 s (default) or 200 ms (user selectable).

Pressure Connections: 6 mm hose connection.

Electrical Connection: Spring connector for cable and leads up to 1.5 mm2.

Cable Conduit: Cap nut conduit, 15 mm (across ats), made of polyamide.

Mounting: Screw fastening with sheet metal screws.

Housing Material: ABS.

Housing Dimensions: Ø 66 x 28 mm.

Enclosure Rating: IP54.

Weight: 1.6 oz (46 g).

Compliance: CE, UKCA.

*Accuracy specications are based on measurements at 73°F (23°C).

Installation

Location

Select a clean, dry mounting location

free from excess vibration where the

temperature will remain between -4

and 158°F (-20 and 70°C). The tubing

supplying pressure to the instrument can

be practically any length required, but long

lengths will increase response time slightly.

Position

The 685 differential pressure transmitter

can be mounted in any position. The zero

compensation eliminates errors due to

positioning.

Pressure Connections

Pressure hoses may not be bent or

damaged during installation. Leaking hoses

and hose connections will cause errors on

the device or inaccurate measurements.

Tubing should have an inner diameter

≤ 3.5/5.5 mm for optimal clamping.

Electrical Connections

Electrical connections are made to the

terminal block located under the cover of

the transmitter. Terminals are marked 1, 2

and 3 as shown below.

Determine which of the following circuit

drawings applies to your application

and wire accordingly. Shielded cable is

recommended. Ground the shield at the

power supply end only.

Do not exceed specied

supply voltage ratings.

Permanent damage

not covered by warranty will result. This

unit is not designed for 120 or 240 VAC line

operation.

NOTICE

Response Time Adjustment

The response time is selectable between

1 seconds (default) and 0.2 seconds.

The response time of the output signal is

congured using the jumper on the circuit

board under the cover. If the jumper is in

place the response time is 1 second. If the

jumper is removed, the response time of

the output signal is 0.2 seconds.

Pressure Range Adjustment

The end of the measuring range can be

set between 50% to 100% of its factory set

full scale value. Make sure the negative

pressure port marked “-” is open, then

apply the designated end of pressure range

to the positive pressure port marked “+”. To

conrm, press the button under the cover

for 5 to 10 seconds. The LED will ash to

conrm the adjustment. The output signal

(0-10 V or 4-20 mA) now corresponds to

the new measuring range.

Zero Adjustment

The zero point can be adjusted by pressing

the zero button for 0-5 seconds. If this is

performed without an applied pressure,

this compares to a zero pressure offset

calibration. If performed with an applied

pressure ”x”, the entire pressure range will

be shifted by this pressure “x”. The LED will

light up to conrm the adjustment. Offset

calibration is recommended for initial start-

up or change in position.

Factory Settings Reset

This feature provides the ability to reset

the transmitter to the original factory

settings and calibration. If the button

under the cover is pressed for longer than

10 seconds, all settings (zero point and

measuring range end) are reset on the

device. The LED will go OFF to conrm the

unit has been reset.

123

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