Dwyer ISDP User Manual
Bulletin A-25
Series ISDP Intrinsically Safe Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Phone: 219/879-8000 www.dwyer-inst.com
25/32
[21.18]
1-15/16
[48.97]
1-5/16
[33]
1-17/32
[38.61]
45/64
[17.78]
5-7/32
[132.54]
4-23/32
[120]
3-7/16
[87.12]
BRACKETS
ARE OPTIONAL
4X ø3/16 [4.76] CLEARANCE
HOLES FOR MOUNTING
3-17/64
[83]
MOUNTING HOLE
PATTERN
4-1/8
[105]
1-5/32
[29.59]
#8-36 SLOTTED MACHINE SCREW
#8 LOCK
WASHER
BRACKET ASSEMBLY
1-45/64
[43.18]
2-31/32
[75.39]
4-23/32
[120]
4-9/64
[105.17]
DIMENSIONS
Shown with Optional A-438 Mounting Bracket
OPTIONAL A-438 BRACKET
MOUNTING DIAGRAM
1
SPECIFICATIONS
Service: Air and non-corrosive gases.
Wetted Materials: Ranges 5˝ and greater: glass, PVC, silicon, alumina ceramic, epoxy,
RTV, gold, aluminum, stainless steel and nickel; Ranges 1˝ and lower: stainless steel, silicone, gold and ceramic.
Housing Materials: Aluminum, glass.
Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour
warm-up).
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in. w.c. = 2 psi;
5˝: 5 psi; 10˝: 5 psi; 25˝: 5 psi; 50˝: 5 psi; 100˝: 9 psi.
Temperature Limits: 32 to 140°F (0 to 60°C).
Compensated Temperature Limits: 32 to 140°F (0 to 60°C).
Thermal Effects: 0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements: 10-35 VDC.
Output Signal: 4-20 mA DC.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (dampening set to 1).
Display: 4 digit LCD 0.6˝ height.
Electrical Connections: M12 4 PIN Connector.
Process Connections: 1/8 female NPT.
Enclosure Rating: Designed to meet NEMA 4x (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Size: 4.73˝ x 4.73˝ x 3.43˝ (120 mm x 120 mm x 87.1 mm).
Weight: 2 lb 10 oz (1.19 kg).
Agency Approvals: FM, C-FM Intrinsically Safe CL1 Div 1 GR: A, B, C, D; CL2 Div 1
GR: E, F, G; CL3 Div 1 CE. CENELEC EN 61326/55024: 2003; IEC 61000-4-2/3/4/6:
2001/2006/2004/2005; CENELEC EN 55011: 2006; 2004/108/EC EMC Directive.
Intrinsic Safety Information
Entity Parameters
Ui = 28VDC
Ii = 93mA
Ci = 22 nF
Li = 400 uH
Pi = 651mW
Intrinsically Safe for the following hazardous areas:
CLASS I DIV. 1 GROUPS A, B, C, D
CLASS II DIV. 1 GROUPS E, F, G
CLASS III DIV. 1 T4
Notes:
1. Remove power from the instrument before carrying out any servicing.
2. Return the instrument to the manufacturer for any repair. Any unauthorized repairs
may impair the intrinsic safety of the instrument.
3. Use only FM approved Associated Apparatus.
4. Install in accordance with ANSI/ISA RP12.06.01, the National Electric Code
ANSI/NFPA 70, in the US, and the Canadian electrical code in Canada.
5. The earth terminal on the housing must be wired to a local earth ground in the
hazardous area.
2
MAXIMUM VALUE (1250Ω)
OPERATING
REGION
R L MAX=
Vps-10.0
20mA DC
VDC
0
5101315
20
25
30
35
TO
TAL R
E
C
EIVE
R
R
E
SISTAN
C
E (
Ω)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
50
40
ISDP
TRANSMITTER
RECEIVER
POWER
SUPPLY
10-35 VDC
mA
SP/AL
MEMENU
SP/AL
MENU
SP/AL
MENU
SP/AL
MENU
E
M-12 Connector
3
2
1
4
+
A-231 M-12 Cable Colors
PIN 1 is Brown (positive)
PIN 3 is Blue (negative)
Use Model A-231 shielded cable with 4 pin Female M-12 connection.
2-WIRE CONNECTION
Fig. C
2-Wire Operation- An external power supply delivering 10 - 35 VDC with minimum current
capability of 40 mA DC (per transmitter) must be used to power the control loop. See Fig.
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 and graph in Fig. D.
POWER SUPPLY VOLTAGE - VDC (2-WIRE CONNECTION)
Fig. D
3
SP/AL
MENUMENU
SP/AL
MENU
SP/AL
MENU
SP/AL
MENU
E
INSTALLATION
Mount the instrument in a location that will not be subject to excessive temperature, shock
or vibration.
Pressure Connections
Use 1/8˝ male NPT fittings. When tightening fittings, grasp the brass fitting on the ISDP
with a 1/2˝ wrench to prevent the fitting on the ISDP from turning.
KEY FUNCTIONS
MENU
HOME POSITION
FUNCTION
Allows access to
the menus
MAIN MENU
FUNCTION
Return to home
position
SUB MENU
FUNCTION
Return to previous menu
UP
ARROW
DOWN
ARROW
ENTER
Displays full scale
range of unit
Sequences through menus
Sequences through menus
Enter into SUB MENU
4
Increments a value
Decrements a value
Changes a value or
setting. Press ENTER and
display will blink. Adjust
with UP or DOWN arrows.
Press ENTER to store.
Display will stop blinking.
Peak/Valley SUB MENU
resets display to present
value.
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