DWYER 626 Series Pressure Transmitters Instruction Manual
- June 17, 2024
- Dwyer
Table of Contents
Series 626 & 628 Pressure Transmitters
Specifications – Installation and Operating Instructions
626 Series Pressure Transmitters
The
Series 626 & 628 Pressure Transmitters converts a single positive pressure
into a standard 4 to 20 mA output signal. The Series 626 and 628 can be used
to accurately measure compatible gases and liquids; Series 626 full scale
accuracy is 0.25%; Series 628 full scale accuracy is 1.0% (see
specifications). Designed for industrial environments with a NEMA 4X (IP66)
housing, this transmitter resists most effects of shock and vibration.
Caution: Do not exceed specified supply voltage ratings. Permanent damage
not covered by warranty will result. This device is not designed for 120 or
240 volt AC operation. Use only on 13 to 30 VDC.
Pressure Ranges
Pressure Range| Maximum Pressure| Over Pressure
0-15 psia
15-0 psia
0-30 psia
0-50 psia
0-100 psia
0-200 psia
0-300 psia
0-5 psig
0-15 psig
0-30 psig
0-50 psig
0-100 psig
0-150 psig
0-200 psig
0-300 psig
0-500 psig
0-1000 psig
0-1500 psig
0-2000 psig
0-3000 psig
0-5000 psig
0-8000 psig| 30 psia
30 psia
60 psia
100 psia
200 psia
400 psia
600 psia
10 psig
30 psig
60 psig
100 psig
200 psig
300 psig
400 psig
600 psig
1000 psig
2000 psig
3000 psig
4000 psig
6000 psig
7500 psig
10000 psig| 45 psia
45 psia
90 psia
150 psia
300 psia
600 psia
900 psia
50 psig
150 psig
300 psig
300 psig
500 psig
750 psig
1000 psig
1500 psig
2500 psig
5000 psig
5000 psig
5000 psig
7500 psig
10000 psig
12000 psig
SPECIFICATIONS
Service: Compatible gases and liquids.
Wetted Materials: Type 316 SS.
Accuracy: 626: 0.25% FS, 0.20% RSS;
628: 1.0% FS, 0.5% RSS; 626 absolute ranges: 0.5% FS, 0.35% RSS. (Includes
linearity, hysteresis, and repeatability).
Temperature Limit: 0 to 200°F (-18 to 93°C).
Compensation Temperature Range: 0 to 175° (-18 to 79°C).
Thermal Effect: 626: ±0.02% FS/°F.
628: ±0.04% FS/°F (includes zero and span).
Pressure Limits: See table.
Power Requirements: 10-30 VDC (for
4 to 20 mA, 0-5, 1-5, 1-6 VDC outpus);
13-30 VDC (for 0-10, 2-10 VDC outputs);
5 VDC ±0.5 VDC (for 0.5-4.5 VDC ratiometric output).
Output Signal:
4 to 20 mA, 0-5 VDC,1-5 VDC, 0-10 VDC, or 0.5-4.5 VDC.
Response Time: 300 ms.
Loop Resistance: 0-1000 Ohms max.
R max = 50 (Vps-10) Ohms (4 to 20 mA output), 5K Ohms (0-5, 1-5, 1-6, 0-10,
2-10, 0.5-4.5 VDC output).
Current Consumption: 38 mA maximum (for 4 to 20 mA output); 10 mA maximum (for
0-5, 1-5, 1-6, 0-10, 2-10, 0.5-4.5 VDC output); 140 mA maxumum (for all
626/628/629-CH with optional LED).
Electrical Connections: Conduit Housing (-CH): terminal block, 1/2˝ female NPT
conduit; General Purpose Housing (-GH): cable DIN EN 175801803-C.
Process Connection: 1/4˝ male or female NPT and BSPT.
Enclosure Rating: NEMA 4X (IP66).
Mounting Orientation: Mount in any position.
Weight: 10 oz (283 g).
Agency Approvals: CE.
INSTALLATION
- Location: Select a location where the temperature of the transmitter will be between 0 and 175°F (-18 to 79°C). Distance from the receiver is limited only by total loop resistance. The tubing or piping supplying pressure to the unit can be practically any length required but long lengths will increase response time slightly.
- Position: The transmitter is not position sensitive. However all standard models are originally calibrated with the unit in a position with the pressure connection downward. Although they can be used at other angles, for best accuracy it is recommended that units be installed in the position calibrated at the factory.
- Pressure Connection: Use a small amount of plumber’s tape or other suitable sealants to prevent leaks. Be sure the pressure passage inside the port is not blocked.
- Electrical Connections
Wire Length – The maximum length of wire connecting the transmitter and receiver is a function of wire size and receiver resistance. Wiring should not contribute more than 10% of the receiver resistance to total loop resistance. For extremely long runs (over 1000 feet), choose receivers with higher resistance to minimize the size and cost of connecting leads. Where wiring length is under 100 feet, wire as small as 22 AWG can be used.
CURRENT (4 to 20 mA) OUTPUT OPERATION
An external power supply delivering 10-30 VDC with minimum current capability
of 40 mA DC (per transmitter) is required to power the control loop. See
Figure A for connection of the power supply, transmitter and receiver. The
range of appropriate receiver load resistance (RL) for the DC power supply
voltage available is expressed by the formula:
Conduit Housing with 4 to 20 mA Output (-CH) Electrical
connections to the pressure transmitters are made to the terminal block
located inside the housing. Remove the screws and lift off the cover. Wire as
shown in Figure A, B or C. Use Figure A for current output connection. Use
Figure B for current output with optional LED display.
Use Figure C for current output with optional LED display using two power
supplies.
If ordering optional pre-wired cable, black wire is negative (-) and red wire
is positive (+).
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
BE SURE TO TURN OFF POWER WHEN CONNECTING OR REMOVING THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT IN THE GAGE DAMAGE.
Figure B: Current output with optional LED display connection
TRANSMITTER CONNECTION:
– TURN OFF POWER
– CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAGE AS SHOWN
– CONNECT LED POWER SUPPLY (-)
TO TERMINAL 3
– CONNECT LED POWER SUPPLY (+)
TO TERMINAL 4
– INSTALL THE DISPLAY’S CONNECTOR
– TURN ON POWER
BE SURE TO TURN OFF POWER WHEN CONNECTING OR REMOVING THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT IN THE GAGE DAMAGE.
Figure C: Current output with optional LED display using two power supplies
Hirschman DIN Connector with 4 to 20 mA When using cable version of -GH
General Purpose Housing, black wire is negative (-) and red wire is positive
(+). When using optional Hirschman DIN Plug, remove top-center screw and lift
off the terminal block assembly. Wire to terminals shown below in Figure D.
For optional 4-pin M-12 connector, wire to pins as shown in Figure E.
VOLTAGE (0-5, 1-5, 0-10, 1-6 or 2-10 VDC) OUTPUT OPERATION
(Other outputs contact the factory) See Figure G for connection of the power
supply, transmitter and receiver.
Conduit Housing (-CH) Electrical connections to the pressure transmitters are
made to the terminal block located inside the housing. Remove the screws and
lift off the cover. Wire as shown in Figure G or Figure H. Use Figure G for
voltage output connection. Use Figure H for voltage output with optional LED
display connection. If ordering optional pre-wired cable, black wire is
negative (-), red wire is positive (+) and white wire is +Vout.
TRANSMITTER CONNECTION:
– TURN OFF POWER
– CONNECT POWER SUPPLY
(+) TO TERMINAL 1
– CONNECT POWER SUPPLY
(-) TO TERMINAL 2 AND TO
THE RECEIVER (-)
– CONNECT THE RECEIVER
(+) TO TERMINAL 3
– CONNECT LED POWER SUPPLY
(+) TO TERMINAL 4
– INSTALL THE DISPLAY’S
CONNECTOR
– TURN ON POWER
BE SURE TO TURN OFF POWER WHEN CONNECTING OR REMOVING THE DISPLAY’S CONNECTOR.
FAILURE TO DO SO CAN RESULT IN THE GAGE DAMAGE.
Figure H: Voltage output with optional LED display connection
Hirschman DIN Connector with Voltage Output When using cable version of -GH
General Purpose Housing, black wire is negative (-), red wire is positive (+)
and white wire is output. When using optional Hirschman DIN Plug, remove top-
center screw and lift off the terminal block assembly. Wire to terminals shown
below in Figure I. For optional 4-pin M-12 connector, wire to pins as shown in
Figure J. If utilizing optional A-164 cable for M-12 connection, brown wire
corresponds to pin #1, white #2, blue #3, and black #4.
RATIOMETRIC (0.5-4.5 VDC) OUTPUT OPERATION
(Other outputs contact the factory) See Figure K for connection of the power
supply, transmitter and receiver.
General Purpose Housing with Ratiometric Output When using cable version of
-GH General Purpose Housing, black wire is negative (-), red wire is positive
(+) and white wire is output. When using optional Hirschman DIN Plug, remove
top-center screw and lift off the terminal block assembly. Wire to terminals
shown below in Figure L. For optional 4-pin M-12 connector, wire to pins as
shown in Figure M. If utilizing optional A-164 cable for M-12 connection,
brown wire corresponds to pin #1, white #2, blue #3, and black #4.
MAINTENANCE
After final installation of the pressure transmitter and its companion
receiver, no routine maintenance is required. A periodic check of system
calibration is suggested. The Series 626 and 628 transmitters are not field
repairable 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. Note: Please do not cover or insert objects into vent hole.
©Copyright 2018 Dwyer Instruments, Inc.
Printed in U.S.A.
2/18 FR# 443271-00 Rev.21
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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