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Bulletin E-112
Series 629 Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
43/64
[17.07] 1-11/32
[34.13]
3-9/32
[83.34]
LIQUID TIGHT FITTING
CORD DIAMETER RANGE:
.200 TO .350 [5.06 TO 8.89]
1/4 NPT
TYP
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
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
Over
Working*
Range Pressure (psi) Pressure (psi)
(psid)
Max. Static on Either Port
5
50
10
10
100
20
25
250
50
30
250
60
50
250
100
100
500
200
150
750
300
200
1000
400
300
1200
600
500
2000
1000
* Pressures exceeding the working
pressure limit may cause a calibration
shift of up to ±3% of full scale.
DWYER INSTRUMENTS, INC.
P.O. BOx 373 • MIChIgAN CITY, INDIANA 46360, U.S.A.
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.
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) for non-LED
models.
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
QualityInstruments-Direct.com
www.dwyer-inst.com
e-mail: [email protected]
1.888.475.5235
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. Due to potential
condensation build up that may travel down conduit or cable and into the
housing, it is recommended to install with the electrical conduit or cable
gland pointing downward.
9/32
[7.14]
6-29/32
[175.42]
2.400
[60.69]
Ø13/64 [5.64] DIA
MOUNTING HOLES
TYP 4 PLACES
5-7/16
[138.11]
6-1/64
[152.81]
2-1/16
[52.39]
2.400
[60.69]
3
[76.20]
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.
Fig. A
B
BLEED SCREW
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.
Fig. B
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.
QualityInstruments-Direct.com
1.888.475.5235
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.
ELECTRICAL CONNECTIONS
Shielded cable is recommended for control loop wiring.
Current Output
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 (RL) for the DC power supply
voltage available is expressed by the formula:
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 (+).
SPAN
13-30 VDC +
(140 ma)
-
TERM
1 (+)
RECEIVER
mA
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 prewired cable, black wire is negative (-), red wire is positive (+) and white
wire is +Vout.
Voltage Output
PRESS AND
HOLD TO
ZERO THE
DISPLAY
PRESS TO DISPLAY
THE GAGE’S
PRESSURE RANGE
ZERO
POWER
SUPPLY
RL Max = Vps – 13
20 mA DC
1 RED
4 (NC)
TERM 2 (-)
LED DISPLAY
POSITIVE SUPPLY
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
TERM 4 (+)
POWER
SUPPLY
13-30 VDC
2 BLACK (COMMON)
PRESSURE
TRANSMITTER 3 WHITE (+V OUT)
YELLOW
LED DISPLAY
CONNECTOR
+V in
RECEIVER
Fig. F: Voltage output connection
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
POWER
SUPPLY
+
13-30 VDC
(140 ma) -
PRESS AND
HOLD TO
ZERO THE
DISPLAY
ZERO
LED DISPLAY SPAN
POSITIVE SUPPLY
TERM 4 (+)
TERM 1 (+)
PRESS TO
DISPLAY THE
GAGE’S
PRESSURE
RANGE
TERM 2 (-)
RECEIVER + V OUT
POWER
SUPPLY
+
13-30 VDC
(40 ma) -
PRESS AND
HOLD TO
ZERO THE
DISPLAY
ZERO
SPAN
RECEIVER
TERM
1 (+)
mA
TERM 2 (-)
- LED DISPLAY
13-30 VDC NEGATIVE SUPPLY
(100 ma) + LED DISPLAY
POSITIVE SUPPLY
LED SUPPLY
POWER SUPPLY
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
- CONNECT LED POWER SUPPLY
(+) TO TERMINAL 4
- INSTALL THE DISPLAY’S CONNECTOR
- TURN ON POWER
PRESS TO
DISPLAY THE
GAGE’S
PRESSURE
RANGE
TERM 3 (-)
TERM 4 (+)
YELLOW
LED DISPLAY
CONNECTOR
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
TERM 3 (-)
YELLOW
LED DISPLAY
CONNECTOR
VOLTAGE OUTPUT
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. g: Voltage output with optional LED display
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. E: Current output with optional LED display using two power supplies
QualityInstruments-Direct.com
1.888.475.5235
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.
©Copyright 2012 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOx 373 • MIChIgAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 7/12
Phone: 219/879-8000
Fax: 219/872-9057
QualityInstruments-Direct.com
FR# 01-443277-00 Rev. 9
www.dwyer-inst.com
e-mail: [email protected]
1.888.475.5235
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