DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Fax: 219/872-9057
e-mail: [email protected]
Series 629 Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-112
1/4 NPT
TYP
6-59/64 [175.82]
OPTIONAL 1/4 NPT
MALE FITTING
5-25/32 [146.84]
1/4 NPT FEMALE FITTING
1-5/8
[41.28]
3-9/32
[83.34]
1-11/32
[34.13]
43/64
[17.07]
LIQUID TIGHT FITTING
CORD DIAMETER RANGE:
.200 TO .350 [5.06 TO 8.89]
629 shown with optional cable gland.
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.
Pressure Limits
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 sig-
nal 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.
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.
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
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 elec-
trical 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 hor-
izontally) 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 pres-
sure 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 provid-
ed 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.
Fig. A
Fig. B
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
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