302-065
Installation & Operating Instructions
Series 629 Differential Pressure Transmitter
SUPERSEDES: June 1, 2012
EFFECTIVE: August 1, 2012
THE SERIES 629 DIFFERENTIAL PRESSURE TRANSMITTER:
43/64" (17.07 mm)
DPS629 shown with
optional cable gland.
3-9/32"
(83.34 mm)
1-11/32"
(34.13 mm)
LIQUID TIGHT FITTING
CORD DIAMETER RANGE:
.200" TO .350" (5.06 mm TO 8.89 mm)
1/4" NPT
TYP
1-5/8" (41.28 mm)
5-25/32" (146.84 mm)
1/4" NPT FEMALE FITTING
PRESSURE LIMITS
RANGE
(psid)
WORKING PRESSURE *
(psid)
OVER PRESSURE
(psid)
10
25
50
100
20
50
100
200
100
250
250
500
* Pressures exceeding the working pressure limit may cause a
calibration shift of up to ±3% of full scale.
SPECIFICATIONS:
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).
719⁄32" (192.60 mm)
213⁄32"
(60.96 mm)
H
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.
2000 ohms minimum load resistance for voltage outputs.
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
6-59/64" (175.82 mm)
OPTIONAL 1/4" NPT
MALE FITTING
3"
(76.20 mm)
L
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.
CAUTION:
ALWAYS USE WRENCH ON PRESSURE BLOCK
WHEN TIGHTENING FITTING
NEVER PUT STRESS ON HOUSING
5
6 ⁄16"
(160.43 mm)
V1
C
L
O
S
E
53⁄4"
(145.80 mm)
O
P
E
N
OPEN
O
P
E
N
OSE
OSE
V2 V3
HI
LO
1 21⁄32"
(41.86 mm)
Figure A
Begin with valve V1 open and valves V2 and
V3 closed (See Figure 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.
C
L
O
S
E
V1
OPEN
BLEED
SCREW
O
P
E
N
O
P
E
N
CLOSE
V2
V3
HI LO
Figure B
CLOSE
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.
ELECTRICAL CONNECTIONS:
Shielded cable is recommended for control loop wiring.
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 Figure 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:
Current Output
1 RED
RL Max =
+
2 BLACK
PRESSURE
TRANSMITTER 3 (NC)
+
mA
-
POWER
SUPPLY
13-30 VDC
RECEIVER
4 (NC)
Figure 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 Figures C, D or E. Use
Figure C for current output connection. Use Figure D for current output with optional LED display. Use Figure 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 (+).
Vps – 13
20 mA DC
Voltage (0-5, 1-5, 0-10, 1-6 or 2-10 Volt) Voltage Operation - For
voltage outputs, wire as shown in Figure F or Figure G. Use Figure F
for voltage output connection. Use Figure 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
1 RED
PRESSURE
TRANSMITTER
+
-
2 BLACK (COMMON)
3 WHITE (+V OUT)
4 (NC)
POWER
SUPPLY
13-30 VDC
+V in
RECEIVER
-
Figure F: Voltage Output Connection
POWER
SUPPLY
13-30 VDC +
(140 ma)
-
PRESS AND HOLD
TO ZERO THE DISPLAY
ZERO
SPAN
TERM
RECEIVER
+
1 (+)
mA
TERM 2 (-)
LED DISPLAY
POSITIVE SUPPLY
TERM 4 (+)
PRESS TO DISPLAY
THE GAUGE’S
PRESSURE RANGE
YELLOW
LED DISPLAY
CONNECTOR
POWER
SUPPLY
+
13-30 VDC
(140 ma)
PRESS AND HOLD
TO ZERO THE DISPLAY
ZERO
LED DISPLAY
SPAN
POSITIVE SUPPLY
TERM 4 (+)
TERM 1 (+)
TERM 2 (-)
PRESS TO DISPLAY
THE GAUGE’S
PRESSURE RANGE
TRANSMITTER CONNECTION:
- TURN OFF POWER
- CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAUGE AS SHOWN
- CONNECT POWER SUPPLY (+) TO TERMINAL 4
(REQUIRED FOR THE OPTIONAL DISPLAY ONLY)
- INSTALL THE DISPLAY’S CONNECTOR
- TURN ON POWER
RECEIVER + V OUT
OPTIONAL LED DISPLAY
BE SURE TO TURN OFF POWER
WHEN CONNECTING OR REMOVING
THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT
IN GAUGE DAMAGE.
Figure D: Current Output with Optional LED Display
TRANSMITTER CONNECTION:
- TURN OFF POWER
- CONNECT POWER SUPPLY
(+) TO TERMINAL 1
- CONNECT POWER SUPPLY (-) TO
TERMINAL 2 AND THE RECEIVER (-)
- CONNECT RECEIVER (+) TO TERMINAL 3
- CONNECT LED POWER SUPPLY (+) TO
TERMINAL 4
- INSTALL THE DISPLAY’S CONNECTOR
- TURN ON POWER
TERM 3 (-)
YELLOW
VOLTAGE OUTPUT
OPTIONAL LED DISPLAY
LED DISPLAY
CONNECTOR
BE SURE TO TURN OFF POWER
WHEN CONNECTING OR REMOVING
THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT
IN GAUGE DAMAGE.
Figure G: Voltage Output with Optional LED Display
MULTIPLE RECEIVER INSTALLATION:
POWER
SUPPLY
PRESS AND HOLD
TO ZERO THE DISPLAY
ZERO
SPAN
TERM 1 (+)
RECEIVER
+
+ mA 13-30 VDC
TERM 2 (-)
(40 ma) TERM 3 (-)
LED DISPLAY
NEGATIVE
SUPPLY
13-30 VDC
TERM 4 (+) YELLOW
LED DISPLAY
(100 ma) +
POSITIVE SUPPLY
LED DISPLAY
POWER SUPPLY
TRANSMITTER CONNECTION:
- TURN OFF POWER
- CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAUGE AS SHOWN
OPTIONAL LED DISPLAY
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 GAUGE’S
PRESSURE RANGE
LED DISPLAY
CONNECTOR
BE SURE TO TURN OFF POWER
WHEN CONNECTING OR REMOVING
THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT
IN GAUGE DAMAGE.
Figure E: Current Output with Optional LED Display
using Two Power Supplies
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
An advantage of the standard 4-20 mA DC output signal provided by
the Series 629 Differential Transmitter is that any number of 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 USA
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.
TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Copyright 2012
TACO, Inc.
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