Dwyer 628CR - Manual

Series 628CR Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin P-628CR
Accurate to ±1% of full scale, The Series 628CR Pressure Transmitter, contains
a low cost ceramic sensor housed in a compact, rugged, NEMA 4X stainless steel
body. Ideal for the budget conscious OEMs that require high levels of performance,
reliability and stability at an unbeatable price. The 628CR housing is small and
lightweight for optimum compatibility with OEM systems. The design allows for a
variety of pressure ranges from -14.7 to 500 psi and optional electrical connections
allowing you to select the right transmitter for your application.
INSTALLATION
1. 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.
2. 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.
3. 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.
4. 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 (4-20 mA) OUTPUT OPERATION
An external power supply delivering 9-30 VDC with minimum current capability of
40 mA DC (per transmitter) is required to power the control loop. See Fig. A for
connection of the power supply, transmitter and receiver. The range of appropriate
receiver load resistance (R
L
) for the DC power supply voltage available is
expressed by the formula:
Shielded cable is recommended for control loop wiring.
Current Output
Fig. A: Current output connection
SPECIFICATIONS
Service: Compatible gases and liquids.
Wetted Materials: Ceramic, fluoroelastomer 316L SS.
Accuracy: ±1.0% FS (includes linearity, hysteresis and repeatability).
Stability: ±0.25% FS/year.
Temperature Limits: 0 to 185°F (-18 to 85°C).
Compensated Temperature Range: 0 to 175°F (-18 to 79°C).
Pressure Limit:
Max pressure: 2x range.
Burst pressure: 3x range.
Thermal Effect: ±0.04% FS/°F.
Power Requirements: 9 to 30 VDC.
Output Signal: 4 to 20 mA.
Response Time: 3 ms typ.
Loop Resistance: 0-1200 Ohm max.
Current Consumption: 40 mA max.
Electrical Connections: Cable or DIN connector.
Process Connection: 1/4˝ male NPT or 1/4˝ male BSPT.
Enclosure Rating: NEMA 4X (IP65).
Mounting Orientation: Mount in any position.
Weight: 4.0 oz.
Agency Approvals: CE.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOx 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
General Purpose Housing
7/8 [22.23]
HEX
1/4 NPT
2-27/64 [61.52]
3-13/64 [81.36]
Ø55/64 [21.83]
R
L
Max = Vps – 13
20 mA DC
1 RED
2 BLACK
3 (NC)
4 (NC)
+ RECIEVER -
mA PRESSURE
TRANSMITTER
POWER
SUPPLY
13-30 VDC
©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 4/13 FR# 00-443774-00 Rev. 2
DIN Electrical Connection: When using cable version, black wire is negative (-)
and red wire is positive (+). When using optional DIN plug, remove top-center
screw and lift off the terminal block assembly. Wire to terminals shown below in
Fig. B.
Fig. B
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 628CR 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.
A
A
SECTION A-A
TERMINAL 1: (+)
TERMINAL 2: (-)