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Bulletin E-112
Series 629 Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
43/64
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LIQUID TIGHT FITTING
CORD DIAMETER RANGE:
.200 TO .350 [5.06 TO 8.89]
1/4 NPT
TYP
629 shown with optional cable gland.
The Dwyer 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.
Range (psid)
10
25
50
100
Pressure Limits
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 plumbers 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.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
1-5/8
[41.28]
5-25/32 [146.84]
1/4 NPT FEMALE FITTING
6-59/64 [175.82]
OPTIONAL 1/4 NPT
MALE FITTING
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 maximum for current
output. For voltage outputs, minimum load resistance:
2000 ohms.
Electrical Connections: Terminal block.
Process Connections: 1/4˝ female NPT.
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
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
Bulletin E-112
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.
9/32
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6-29/32
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2.400
[60.69]
Ø13/64 [5.64] DIA
MOUNTING HOLES
TYP 4 PLACES
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) must be used to power the control loop.
See Figure D 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 = Vps – 13
20 mA DC
Shielded two wire cable is recommended for control loop wiring. If
grounding is required use negative side of control loop after receiver, see Figure D.
5-7/16
[138.11]
Fig. D
6-1/64
[152.81]
2-1/16
[52.39]
2.400
[60.69]
3
[76.20]
VOLTAGE (0-5, 1-5, 0-10, 1-6 or 2-10 Volt) OUTPUT
OPERATION
(Other outputs contact the factory) See Fig. E for connection of the
power supply, transmitter and receiver.
Votage Output
Fig. A
1 RED
POWER
SUPPLY
13-30 VDC
2 BLACK (COMMON)
PRESSURE
TRANSMITTER 3 WHITE (+V OUT)
4 (NC)
BLEED SCREW
+V in
RECEIVER
Fig. E
If ordering optional pre-wired cable, black wire is negative (-) red
wire is positive (+) and white wire is output (Vout).
Fig. B
ELECTRICAL CONNECTIONS
CAUTION: Do not exceed specified supply voltage ratings.
Permanent damage not covered by warranty will result. This unit is
not designed for 120 or 240 volt AC line operation.
Electrical connections to the Series 629 Differential Pressure
Transmitter are made on the inside of the enclosure unit. Feed
stripped and tinned leads to the terminal block screws shown in
Fig. C.
NOTE: The ground (GND) connection is a unit ground, See Fig. C.
TERMINAL 1 (+)
TERMINAL 2 (-)
Fig. C
If ordering optional pre-wired cable, black wire is negative (-) and
red wire is positive (+).
©Copyright 2006 Dwyer Instruments, Inc.
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 4-20 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.
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.
Printed in U.S.A. 2/06
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
FR# 01-443277-00 Rev. 6
www.dwyer-inst.com
e-mail: [email protected]

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