Dwyer Instruments 629 Series Installation And Operating Instructions Manual

Series 629 Differential Pressure Transmitter

9/32

[7.14]

6-29/32

[175.42]

2.400

[60.69]

5-7/16

[138.11]

6-1/64

[152.81]

3

[76.20]

2.400

[60.69]

2-1/16

[52.39]

Ø13/64 [5.64] DIA

MOUNTING HOLES

TYP 4 PLACES

BLEED SCREW

Specifications - Installation and Operating Instructions

43/64

[17.07]

LIQUID TIGHT FITTING

CORD DIAMETER RANGE:

.200 TO .350 [5.06 TO 8.89]

1/4 NPT

TYP

[41.28]

5-25/32 [146.84]

629 shown with optional cable gland.

The Series 629 Differential Pressure Transmitter monitors differential pressure of
air and compatible gases and liquids with 0.5% accuracy. The design employs dual
pressure sensors converting pressure changes into a standard 4-20 mA output sig­nal for two wire circuits. Small internal volume and minimum moving parts result in
exceptional response and reliability. Terminal block, zero and span adjustments are
easily accessed under the top cover. The Series 629 Differential Pressure Transmitter
is designed to meet NEMA-4X (IP66) construction.

Pressure Limits

Range (psid)

10
25
50

100

Working*

Pressure (psid)

20

50
100
200

Over

Pressure (psi)

100
250
250
500

* Pressures exceeding the working pressure limit may cause a
calibration shift of up to ±3% of full scale.

INSTALLATION

1. Location: Select a location where the temperature of the unit will be between 0°F

and 175°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 hor­izontally) since that is how all standard models were originally spanned and zeroed at
the factory. They can be used at other angles, but may require final spanning and
zeroing.

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 fittings or similar mechanisms should be used to bleed off
any trapped air.

Optional 3-Way Valve

For applications where higher line pressures may be encountered at installation or
when it is necessary to remove the transmitter for maintenance without interrupting
the process, the optional three way valve is recommended (See Fig. A).

Begin with valve V1 open and valves V2 and V3 closed (See Fig. B). Slowly open
valves V2 and V3. Once the pressure has stabilized and is equal on the high and low
side of the transmitter, valve V1 can be closed and normal operation can proceed.

To ensure proper pressures will be detected by the 629 use the bleed fitting provid­ed with this package to free media of bubbles. Before applying pressure to the
process connections, turn V1 to the open position and back off the bleed screw. Next
apply pressure. After the flowing liquid is free of bubbles, retighten the bleed screw.

Before removing the transmitter from operation, open valve V1 then close valves V2
and V3.

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

SPECIFICATIONS
Service: Compatible gases & liquids.
Wetted Materials: Types 316, 316L

SS.
Accuracy: +/- 0.5% F.S. (includes
linearity, hysteresis & repeatability).
Temperature Limits: 0 to 200°F
(-18 to 93°C).

Compensated Temperature Limits:

0 to 175°F (-18 to 79°C).

Pressure Limits: See chart.
Thermal Effect: 0.02%/°F (0.036%/°C)

includes zero & span.

Power Requirements: 13-30 VDC.
Output Signal: 4 to 20 mA. Optional

0-5, 1-5, 0-10, 1-6 or 2-10 VDC.
Zero & Span: Potentiometers inside
conduit enclosure

Response Time: 50 msec.
Loop Resistance: 0-1300 ohms maxi-

mum for current output. For voltage
outputs, minimum load resistance:
2000 ohms.

Phone: [phone] www.dwyer-inst.com

1/4 NPT FEMALE FITTING

6-59/64 [175.82]

OPTIONAL 1/4 NPT

MALE FITTING

Fig. A

Fig. B

Current Consumption: Transmitter:

40 mA max; Transmitter with optional
display: 140 mA max.
Electrical Connections: Terminal
block.
Process Connections: 1/4˝ female
NPT.
Display: Optional 4-1/2 digit 1/2˝ (12.7
mm) height LED.
Enclosure Rating: Designed to meet
NEMA 4X (IP66).
Mounting Orientation: Not position
sensitive.

Weight: 10.1 oz (286 g).
Agency Approvals: CE:

EN 61000-4-2
EN 61000-4-3
EN 61000-4-4
EN 61000-4-5
EN 61000-4-6

Bulletin E-112

1-11/32

[34.13]

3-9/32

[83.34]

1-5/8

ELECTRICAL CONNECTIONS

PRESSURE

TRANSMITTER

1 RED
2 BLACK (COMMON)

3 WHITE (+V OUT)
4 (NC)

RECEIVER

+V in

POWER

SUPPLY

13-30 VDC

ZERO

PRESS AND
HOLD TO
ZERO THE
DISPLAY

PRESS TO
DISPLAY THE
GAGE’S
PRESSURE
RANGE

LED DISPLAY
CONNECTOR

YELLOW

OPTIONAL LED DISPLAY
BE SURE TO TURN OFF POWER WHEN
CONNECTING OR REMOVING THE
DISPLAY’S CONNECTOR. FAILURE TO DO
SO CAN RESULT IN THE GAGE DAMAGE.

VOLTAGE OUTPUT

TRANSMITTER CONNECTION:

- TURN OFF POWER

- CONNECT POWER SUPPLY
(+) TO TERMINAL 1

- CONNECT POWER SUPPLY
(-) TO TERMINAL 2 AND
THE RECEIVER (-)

- CONNECT THE RECEIVER
(+) TO TERMINAL 3

- CONNECT LED POWER SUPPLY
(+) TO TERMINAL 4

- INSTALL THE DISPLAY’S CONNECTOR

- TURN ON POWER

POWER
SUPPLY

13-30 VDC

(140 ma)

RECEIVER

+

-

­+

V OUT

LED DISPLAY

POSITIVE SUPPLY

TERM 4 (+)

TERM 1 (+)

TERM 2 (-)

TERM 3 (-)

SPAN

Shielded cable is recommended for control loop wiring.

Current Output

Fig. C: Current output connection

Electrical connections to the Series 629 pressure transmitters are made to the termi­nal block located inside the housing. Remove the screws and lift off the cover. Wire
as shown in Fig. C, D or E. Use Fig. C for current output connection. Use Fig. D for
current output with optional LED display. Use Fig. E for current output with optional
LED display using two power supplies. If ordering pre-wired cable, black wire is neg­ative (-) and red wire is positive (+).

PRESS AND
HOLD TO
ZERO THE
DISPLAY

PRESS TO DISPLAY
THE GAGE’S
PRESSURE RANGE

LED DISPLAY
CONNECTOR

POWER

SUPPLY

13-30 VDC

(140 ma)

+

RECEIVER

-

LED DISPLAY

POSITIVE SUPPLY

ZERO

SPAN

TERM

1 (+)

mA

TERM 2 (-)

TERM 4 (+)

YELLOW

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 (4-20 mA) Output Operation - An external power supply delivering 13-30
VDC with minimum current capability of 40 mA DC (per transmitter)is required to
power the control loop. See Fig. C for connection of the power supply, transmitter,
and receiver. The range of the appropriate receiver load resistance (R
power supply voltage available is expressed by the formula:

L

R

Max = Vps – 13

L

) for the DC

20 mA DC

VOLTAGE (0-5, 1-5, 0-10, 1-6 or 2-10 Volt) OUTPUT OPERATION

For voltage outputs, wire as shown in Fig. F or Fig. G. Use Fig. F for voltage output
connection. Use Fig. G for voltage output with optional LED display. Terminal 1 is pos­itive (+), terminal 2 is negative (-), terminal 3 is +Vout, terminal 4 is LED positive sup­ply. If ordering optional pre-wired cable, black wire is negative (-), red wire is positive
(+) and white wire is +Vout.

Voltage Output

Fig. F: Voltage output connection

TRANSMITTER CONNECTION:

- TURN OFF POWER

- CONNECT THE POWER
SUPPLY AND RECEIVER TO
TERM 1 AND TERM 2 OF THE
GAGE AS SHOWN

- CONNECT POWER SUPPLY
(+) TO TERMINAL 4 (REQUIRED
FOR THE OPTIONAL DISPLAY ONLY)

- INSTALL THE DISPLAY’S CONNECTOR

- TURN ON POWER

OPTIONAL LED DISPLAY

BE SURE TO TURN OFF POWER WHEN
CONNECTING OR REMOVING THE
DISPLAY’S CONNECTOR. FAILURE TO DO
SO CAN RESULT IN THE GAGE DAMAGE.

Fig. D: Current output with optional LED display

PRESS AND
HOLD TO
ZERO THE
DISPLAY

PRESS TO
DISPLAY THE
GAGE’S
PRESSURE
RANGE

LED DISPLAY
CONNECTOR

Fig. G: Voltage output with optional LED display

MULTIPLE RECEIVER INSTALLATION

An advantage of the standard 4-20 mA DC output signal provided by the Series 629
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

POWER
SUPPLY

+

13-30 VDC

-

(40 ma)

-

13-30 VDC

+

(100 ma)

LED SUPPLY
POWER SUPPLY

RECEIVER

LED DISPLAY

NEGATIVE SUPPLY

LED DISPLAY

POSITIVE SUPPLY

ZERO
SPAN

TERM
1 (+)

mA

TERM 2 (-)

TERM 3 (-)

TERM 4 (+)

YELLOW

4-20 mA input and proper polarity of the input connections be observed when insert-

TRANSMITTER CONNECTION:

- TURN OFF POWER

- CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAGE AS SHOWN
OPTIONAL DISPLAY CONNECTION:

- CONNECT LED POWER SUPPLY
(-) TO TERMINAL 3

Fig. E: Current output with optional LED display using two power supplies

©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR# 01-443277-00 Rev. 8

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

- CONNECT LED POWER SUPPLY
(+) TO TERMINAL 4

- INSTALL THE DISPLAY’S CONNECTOR

- TURN ON POWER

OPTIONAL LED DISPLAY

BE SURE TO TURN OFF POWER WHEN

CONNECTING OR REMOVING THE

DISPLAY’S CONNECTOR. FAILURE TO DO

SO CAN RESULT IN THE GAGE DAMAGE.

ing 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.

MAINTENANCE

Upon final installation of the Series 629 Differential Pressure Transmitter and the com­panion receiver, no routine maintenance is required. A periodic check of the system
calibration is recommended. The Series 629 Differential Pressure Transmitter 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 description of the prob­lem plus any relevant application notes. Contact customer service to receive a return
goods authorization number before shipping.

Phone: [phone] www.dwyer-inst.com