Dwyer Instruments ISDP Operating 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

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BRACKETS

ARE OPTIONAL

4X ø3/16 [4.76] CLEARANCE

HOLES FOR MOUNTING

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MOUNTING HOLE

PATTERN

4-1/8 [105]

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#8-36 SLOTTED MACHINE SCREW

#8 LOCK

WASHER

BRACKET ASSEMBLY

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DIMENSIONS

Shown with Optional A-438 Mounting Bracket

OPTIONAL A-438 BRACKET

MOUNTING DIAGRAM

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.

MAXIMUM VALUE (1250Ω)

OPERATING 

REGION

R L MAX=

Vps-10.0

20mA DC

VDC

5101315

TAL R

EIVE

SISTAN

E (

Ω)

1500 1400 1300 1200 1100 1000

900 800 700 600 500 400 300 200 100

ISDP

TRANSMITTER

RECEIVER

POWER SUPPLY

10-35 VDC

SP/AL

MEMENU

SP/AL

M-12 Connector

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

SP/AL

MENUMENU

SP/AL

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

HOME POSITION FUNCTION

Allows access to the menus

MAIN MENU FUNCTION

Return to home position

SUB MENU FUNCTION

Return to previous menu

ARROW

DOWN

ARROW

ENTER

Displays full scale range of unit

Sequences through menus

Enter into SUB MENU

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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