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 used to measure gas or liquid pressure compatible with 316L stainless steel wetted parts. With an accuracy of ±0.25% and a pressure range of 0-1000 psi, it can withstand working pressures up to 3000 psi. It features a 4-20 mA output signal and is not position sensitive, although zeroing and spanning should be done in the vertical position. It has 1/4" NPT female pressure connections and an enclosure rating of NEMA 4X (IP66).

Dwyer Series 655A is a wet/wet differential pressure transmitter used to measure gas or liquid pressure compatible with 316L stainless steel wetted parts. With an accuracy of ±0.25% and a pressure range of 0-1000 psi, it can withstand working pressures up to 3000 psi. It features a 4-20 mA output signal and is not position sensitive, although zeroing and spanning should be done in the vertical position. It has 1/4" NPT female pressure connections and an enclosure rating of NEMA 4X (IP66).

Bulletin P-4-655A
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]
Specifications - Installation and Operating Instructions
Series 655A Wet/Wet Differential Pressure Transmitter
SPECIFICATIONS
Service: Compatible gasses or liquids.
Wetted Materials: 316L SST.
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% F.S. oven comp. temperature range.
Power Requirements: 8 to 38 Vdc.
Output Signal: 4 to 20 mA.
Static Pressure Effects: on zero: ≤ ±0.25% FSO per 1000 psi;
on span: ≤ ±0.5% of reading per 1000 psi.
Loop Resistance: 1500 ohms.
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˝ ±H
2
O depending on orientation.
Response Time: < 10 mS.
Weight: 18 oz (510 g).
Agency Approval: CE.
The Series 655A 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-P MODELS
(
4-3/4) [120.65]
2
[50.80]
4
WIRE CABLE
1/4” FEMALE NPT
1
-1/4 [31.75]
(
2-35/64) [64 77]
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 7/14 FR# R9-443718-00 Rev. 1
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]
Electrical Connections
Use A-232 with 6˝ pin connection models
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 final 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 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
A
-232 CONNECTOR END
O
PPOSITE END IS SIX WIRES
C
OLORS: RED POSITIVE,
BLACK NEGATIVE,
GREEN CASE GROUND
Two (2)-Wire Operation
An external power supply delivering 8 to 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 two wire cable is recommended for control loop wiring.
PRESSURE
TRANSMITTER
POWER
SUPPLY
8-38 VDC
RED WIRE
B
LACK WIRE
R
ECEIVER
2-WIRE CONNECTION
1400
1500
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
05
10
15
20
25 30
35
40
VDC
W
R MAX= Vps-8.0
20 mA DC
L
RECEIVER RESISTANCE (Ω)
Operating
Range
POWER SUPPLY VOLTAGE - VDC
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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 used to measure gas or liquid pressure compatible with 316L stainless steel wetted parts. With an accuracy of ±0.25% and a pressure range of 0-1000 psi, it can withstand working pressures up to 3000 psi. It features a 4-20 mA output signal and is not position sensitive, although zeroing and spanning should be done in the vertical position. It has 1/4" NPT female pressure connections and an enclosure rating of NEMA 4X (IP66).

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