Dwyer Instruments 631 Series User manual

Series 631 Differential Pressure Transmitter

Specications - Installation and Operating Instructions

Bulletin E-114

The Series 631 Differential Pressure Transmitter monitors differential pressure

of air and compatible gases and liquids. The design employs converting pressure

changes into a standard 4-20 mA output signal for two wire circuits. Digital push-button,

zero and span adjustments are easily accessed on the front cover. The Series 631

Differential Pressure Transmitter is designed to meet NEMA-4X (IP66) construction.

INSTALLATION

1. Location: Select a location where the temperature of the unit will be between 20 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

practically any length required, but long lengths will increase the response time

slightly. Mount the instrument in a location that will not be subject to excessive

temperature, shock or vibration.

2. Position: A vertical position is recommended (pressure connections pointing

vertically) since that is how all standard models were originally spanned and

zeroed at the factory.

3. Pressure Connection: Dual 1/4˝ female NPT pressure connections are provided.

Use pipe thread sealant tape or other suitable pipe joint compound when making

connection to the pressure source. Avoid excess sealant which could block the

pressure passage. When monitoring liquid pressures, air trapped in the lines can

cause incorrect readings. Bleed ttings or similar mechanisms should be used to

bleed off any trapped air.

SPECIFICATIONS

Service: Compatible gases & liquids.

Wetted Materials: Brass, silicone, 300 SS.

Accuracy: Transmitter Output: ±2% F.S. (includes linearity, hysteresis and

repeatability); Gage: ±3% of full scale at 70°F (21.1°C).

Stability: ±1% F.S./yr.

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

Pressure Limits: -20˝ Hg to 500 psig. (-0.677 bar to 34.4 bar).

Thermal Effect: Greater than 1˝ ranges: ±0.025%/°F (±0.045%/°C); 1˝ range:

±0.045%/°F (±0.081%/°C); 0.5˝ range: ±0.09%/°F (±0.162%/°C).

Power Requirements: 10-35 VDC.

Output Signal: 4 to 20 mA.

Response Time: 50 msec.

Loop Resistance: 0-1250 ohms maximum.

Electrical Connections: M-12 circular 4 pin connector.

Process Connections: 1/4˝ female NPT high and low pressure taps, duplicated -

one pair top for air and gas, and one pair bottom for liquids.

Enclosure Rating: Designed to meet NEMA 4X (IP66).

Mounting Orientation: Diaphragm in vertical position. Consult factory for other

position orientations.

Weight: 8 lb, 4 oz (3.74 kg).

Agency Approvals: CE.

[127.00]

4-45/64

[119.46]

3-13/32

[86.52]

13/32

[10.32] TYP 3/16

[4.76]

1/4 FEMALE NPT LOW

PRESSURE CONNECTION (LIQUID)

(4) #6-32 X 3/8 [9.53] DP

HOLE ON A 4-11/32 [110.33]

BOLT CIRCLE

1/4 FEMALE NPT HIGH

PRESSURE CONNECTION (LIQUID)

1/4 FEMALE NPT LOW

PRESSURE CONNECTION

(AIR OR GAS)

1/4 FEMALE NPT HIGH

PRESSURE CONNECTION

(AIR OR GAS)

3/4 [19.05] TYP

35° TYP

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219/879-8000

Fax: 219/872-9057

www.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

www.dwyer-inst.com

e-mail: [email protected]

ELECTRICAL CONNECTIONS

CAUTION: 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 volt AC line

operation.

Wire Length - The Maximum length of wire connecting transmitter and receiver is a

function of wire size and receiver resistance. Wiring should not contribute to more than

10% of receiver resistance to total loop resistance. For extremely long runs (over 1000

ft.), choose receivers with higher resistance to minimize size and cost of connecting

leads. When the wiring length is under 100 feet, lead wire as small as 22 AWG can

be used.

Current (4 to 20 mA) Output Operation - An external power supply delivering 10-35

VDC with minimum current capability of 40 mA DC (per transmitter) must be used to

power the control loop. See Figure B for connection of the power supply, transmitter,

and receiver. The range of the appropriate receiver load resistance (RL) for the DC

power supply voltage available is expressed by the formula:

RL Max =

Shielded two wire cable is recommended for control loop wiring. If grounding is

required use negative side of control loop after receiver, see Figure B.

MULTIPLE RECEIVER INSTALLATION

An advantage of the standard 4 to 20 mA DC output signal provided by the Series 631

Differential Transmitter is that any number or receivers can be connected in series

in the current loop. Thus, an A-701 digital readout, an analog panel meter, a chart

recorder, process controlling equipment, or any combination of these devices can be

operated simultaneously. It is necessary only that each be equipped with a standard 4

to 20 mA input and proper polarity of the input connections be observed when inserting

the device into the current loop. If any of the receiving devices displays a negative or

downscale reading this indicates that the signal input leads are reversed.

MOUNTING OPTIONS

MAINTENANCE

Upon nal installation of the Series 631 Differential Pressure Transmitter and the

companion receiver, no routine maintenance is required. A periodic check of the

system calibration is recommended. The Series 631 Differential Pressure Transmitter

is not eld serviceable and should be returned if repair is needed (eld repair should

not be attempted and may void warranty). Be sure to include a brief description of the

problem plus any relevant application notes. Contact customer service to receive a

return goods authorization number before shipping.

SERIES 631

PRESSURE

TRANSMITTER

POWER

SUPPLY

10-35 VDC

RECEIVER

Figure A

Figure B

Vps – 10

20 mA DC

1/4 (6.35) HOLES IN PANEL

FOR BLOWOUT PASSAGE

3/4 (19.05) HOLE IN PANEL

FOR ELECTRICAL

CONNECTION

42 - TYP 2 PLACES

(4) 3/16 (4.76) HOLES IN PANE

EQUALLY SPACED ON A

4-11/32 (110.33) B.C.

SURFACE MOUNT HOLE PATTERN

This symbol indicates waste electrical products should not be disposed

of with household waste. Please recycle where facilities exist. Check with

your Local Authority or retailer for recycling advice.

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