Dwyer Series 655A User manual

Series 655A
Dwyer
Brand
Dwyer
Model
Series 655A
Type
User manual

Dwyer Series 655A is a wet/wet differential pressure transmitter designed to measure gas or liquid pressure. It features high accuracy of ±0.25% BFSL, RSS, and can withstand working pressures up to 1000 psi continuous and 3000 psi burst. With a response time of less than 10 ms and a 4-20 mA output signal, it provides reliable pressure monitoring and control. Installation is straightforward, with 1/4" NPT female pressure connections and optional 6-pin connector for electrical connections.

Dwyer Series 655A is a wet/wet differential pressure transmitter designed to measure gas or liquid pressure. It features high accuracy of ±0.25% BFSL, RSS, and can withstand working pressures up to 1000 psi continuous and 3000 psi burst. With a response time of less than 10 ms and a 4-20 mA output signal, it provides reliable pressure monitoring and control. Installation is straightforward, with 1/4" NPT female pressure connections and optional 6-pin connector for electrical connections.

Series 655A Wet/Wet Differential Pressure Transmitter
Specications - Installation and Operating Instructions
Bulletin P-4-655A
The Series 655A Wet/Wet Differential Pressure Transmitter converts a positive
differential pressure measurement into a standard 4-20 mA output signal. Designed
for use as a wet/wet differential pressure transmitter, it can be used to measure gas
or liquid pressure compatible with 316L stainless steel wetted parts. With an accuracy
of < ±0.25% (BFSL, RSS), the Series 655A Pressure Transmitter can measure low
differential pressures, but can withstand working pressures to a maximum of 1000 psi
(68.95 bar), 3000 psi (206.8 bar) burst.
INSTALLATION
Location
Select a location where the temperature of the transmitter will be between -20 to 200°F
(-29 to 93°C). Distance from the receiver is limited only by total loop resistance. Tubing
or piping of extended 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 vertical position and with the pressure connections at
horizontal. Although they can be used at other angles, for best accuracy it is
recommended that zeroing and spanning be done while unit is in the alternative
position.
Pressure Connections
Pressure connections are 1/4˝ female NPT. Use a small amount of plumbers thread
tape or other suitable sealant to prevent leaks. Be sure the pressure passage inside
the port is not blocked.
655A-XX-C models 655A-XX-P models
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: 316L SS.
Accuracy: ±0.25% BFSL, RSS (combined effect of non-linearity, hysteresis, and
repeatability).
Stability: ≤ ±0.25% FSO/yr.
Temperature Limits: -20 to 200°F (-29 to 93°C).
Compensated Temperature Limits: 0 to 170°F (-17.8 to 76.7°C).
Pressure Limits: 1000 psi (68.95 bar) continuous; 3000 psi (206.8 bar) burst.
Thermal Effects: ≤ ±1.5% FS oven comp. temperature range.
Power Requirements: 8-38 VDC.
Output Signal: 4-20 mA.
Static Pressure Effects: On zero: ≤ ±0.25% FSO per 1000 psi; on span: ≤ ±0.5%
of reading per 1000 psi.
Response Time: < 10 ms.
Loop Resistance: 1500 Ω.
Electrical Connections: Cable exit with 24˝ cable; optional 6-pin connector.
Process Connections: 1/4˝ NPT female.
Enclosure Rating: Designed to meet NEMA 4X (IP66).
Mounting Orientation: Mount in vertical position: zero shifts up to ±1 in w.c.
depending on orientation.
Weight: 18 oz (510 g).
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: [email protected]
5-3/32 [129.38]
2-1/2
[63.5]
4-WIRE CABLE
1/4˝ FEMALE NPT
1-1/4 [31.75]
2-27/32 [72.23]
Printed in U.S.A. 9/21 FR# 443718-00 Rev. 2©Copyright 2021 Dwyer Instruments, Inc.
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: [email protected]
Electrical Connections
2-wire operation
An external power supply delivering 8-38 VDC with minimum current capability of 40
mA DC (per transmitter) is required to power the control loop. The range of appropriate
receiver load resistance for the DC power supply voltage available is expressed by
the formula and graph below. Shielded 2-wire cable is recommended for control loop
wiring.
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
(305 m)), choose receivers with lower resistance to minimize the size and cost of
connecting leads. Where wiring length is under 100 feet (30.5 m), wire as small as 22
AWG can be used.
MAINTENANCE
Upon nal installation of the Series 655A Differential Pressure Transmitter, no routine
maintenance is required. A periodic check of system calibration is recommended.
The Series 655A is not eld serviceable and should be returned if repair is needed
(eld 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
2-wire connection
Use A-232 with 6˝ pin connection models
Power supply voltage - VDC
PRESSURE
TRANSMITTER
POWER
SUPPLY
8-38 VDC
RED WIRE
BLACK WIRE
RECEIVER
+
+
-
-
1400
1500
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100 05
10 15 20 25 30 35
40
VDC
RL MAX= VPS-8.0
20 mA DC
RECEIVER RESISTANCE (Ω)
OPERATING
RANGE
A-232 CONNECTOR END
OPPOSITE END IS SIX WIRES
COLORS: RED POSITIVE,
BLACK NEGATIVE,
GREEN CASE GROUND
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Dwyer Series 655A User manual

Series 655A
Dwyer
Brand
Dwyer
Model
Series 655A
Type
User manual

Dwyer Series 655A is a wet/wet differential pressure transmitter designed to measure gas or liquid pressure. It features high accuracy of ±0.25% BFSL, RSS, and can withstand working pressures up to 1000 psi continuous and 3000 psi burst. With a response time of less than 10 ms and a 4-20 mA output signal, it provides reliable pressure monitoring and control. Installation is straightforward, with 1/4" NPT female pressure connections and optional 6-pin connector for electrical connections.

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