Dwyer Instruments DH3 Operating Manual

Bulletin B-30

Series DH3 Digihelic® Differential Pressure Controller

Specications - Installation and Operating Instructions

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219/879-8000 Fax: 219/872-9057

dwyer-inst.com e-mail: info@dwyermail.com

DIMENSIONS

(4) 6-32 HOLES

PRESSURE CONNECTION

SURFACE MOUNTING

2-1/16 [52.39]

1/8 FEMALE NPT HIGH

PRESSURE CONNECTION

1/8 FEMALE NPT LOW

PRESSURE CONNECTION

SPECIFICATIONS

Service: Air and non-combustible, compatible gases.

Wetted Materials: Consult factory. Housing Material: Die cast aluminum case and bezel. Accuracy: ±1.5% for 0.25 in and ±0.25 in w.c. ranges. Ranges 0.5 in to 5 in w.c. and corresponding bidirectional

(except ±2.5 in w.c.): ±1%; All other ranges: ±0.5% @ 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.: 25 psi; ±2.5˝, 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.:

5 psi; 100 in w.c.: 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). For 0.25˝ and ±0.25 in w.c. ranges: ±0.03%/°F

(±0.054%/°C).

Power Requirements: 12-24 VAC/VDC. Power Consumption: 3 VA max. Output Signal: 4 to 20 mA DC into 900 ohms max. Zero & Span Adjustments: Accessible via menus. Response Time: 250 ms (dampening set to 1). Display: Backlit 4 digit LCD 0.4˝ height LED indicators for set point and alarm status.

Electrical Connections: 15 pin male high density D-Sub connection. 18˝ (46 cm) cable with 10 conductors

included.

Process Connections: 1/8˝ female NPT. Side or back connections.

Mounting Orientation: Mount unit in vertical plane.

Size: 5˝ (127 mm) O.D. x 3-1/8˝ (79.38 mm); For -SS Bezel: 4-3/4˝ (120.7 mm) O.D. x 2-21/32˝ (67.5mm). Weight: 1.75 lbs. (794 g).

Agency Approvals: CE.

[50.80]

1-1/4

[31.75]

2-1/2

[63.50]

1/8 FEMALE NPT LOW

EQUALLY SPACED ON A

ø4-47/64

[120.25]

5/8 [15.88]

PANEL MAX

3/16

[4.76]

1/2

[12.70]

1-9/32 [32.54]

5-1/8 (130.18) B.C.

PANEL MOUNTING

Ø5

[127.00]

5-1/2 [139.70] O.D.

MOUNTING RING

11/16

[17.46]

11/16

[17.46]

Ø4 [101.60]

FACE

1/8 FEMALE NPT HIGH PRESSURE CONNECTION

30°

1-3/4

[44.45]

1/2

[12.70]

(3) Ø3/16 [4.77] HOLES EQUALL SPACED ON A 4-1/8 [104.78] B.C.

SWITCH SPECIFICATIONS Switch Type: 2 SPDT relays.

Electrical Rating: 1 amp @ 30 VAC/VDC.

Set Point Adjustment: Adjustable via keypad on face.

INSTALLATION

(3) Ø3/16 [4.77] HOLES

LOW PRESSURE CONNECTION

LOCATION: Select a clean, dry location free from shock and vibration where temperature limits will not be

exceeded. Distance from the transmitter to the receiver is limited only by total loop resistance. See ELECTRICAL CONNECTIONS. Tubing feeding pressure to the instrument can be practically any length required, but long lengths

will increase response time slightly.

POSITION: All standard models are calibrated for use in a vertical mounting position. Higher range models will perform properly at other angles but should be spanned and zeroed in the position in which they will be used. Because of their sensitivity to gravitational forces, models with ranges under 1 in w.c. (25.4 mm w.c.) must always be mounted vertically.

PRESSURE CONNECTIONS: For installation convenience two sets of 1/8˝ female NPT pressure ports are supplied.

Be sure to seal the unused ports with pipe plugs included.

Positive Pressure - Connect tubing to HIGH PRESSURE port and vent LOW PRESSURE port to atmosphere.

Negative (Vacuum) Pressure - Connect tubing to LOW PRESSURE port and vent HIGH PRESSURE port to atmosphere. (When operating this device in a dusty environment, install an optional A-331 Filter Vent Plug in the

vented port to keep interior clean.)

Differential Pressure - Connect tubing from the higher source to HIGH PRESSURE port and from the lower source to LOW PRESSURE port.

1-1/2 [38.1]

5/16

[7.94]

11/16

[17.46]

Ø1/2 [12.70] HOLE FOR HIGH PRESSURE CONNECTION

3/4

[19.05]

1-3/32

[27.78]

Ø1/2 [12.70] HOLE FOR

Figure A

1-3/4

[44.45]

1/2 [12.70]

EQUALLY SPACED ON A 4-1/8 [104.78] B.C.

MOUNTING: The DH3 may be either panel (ush) mounted or surface mounted.

APS

SNAP RING

Panel Mounting - Cut a 4-3/4˝ or 121 mm diameter hole in the panel and insert the unit from the front. Slip on the mounting ring with the stepped side facing rear. Next, t the snap ring into the narrow groove at back edge of bezel. Thread four (6) 32 x 1-1/4˝ mounting screws into tapped holes in mounting ring and set it against snap ring. Tighten

screws against rear of panel. See Figure B.

GROOVE

Ø4-3/4 [120.65] HOLE

PNEUMATIC PRESSURE T

Figure B

Surface Mounting - Drill (3) 3/16˝ (4.76 mm) diameter holes for mounting and cut a 9/16˝ x 1-1/2˝ (14.3 x 38.1 mm) opening for access to terminal block as indicated in Figure B. If rear pressure connections are to be used, also provide 1/2˝ diameter holes as shown in Figure A and Figure C. Insert 6-32 machine screws from rear of mounting surface,

thread into tapped holes on back of transmitter and tighten.

Figure C

For -SS Bezel Installation

Provide a 4-9/16˝ opening in panel. Insert gage and secure with supplied mounting hardware.

WIRING

The DH3 uses a standard 15 pin male high density D-Sub connector available from most electronic distributors. A pre-wired 18˝ cable is included with each unit. See below table for cable color wiring information.

15 PIN

Function

12-24 VAC/VDC Power 12-24 VAC/VDC Power 4-20mA XMTR Output 4-20mA XMTR Output + SP1 Relay N/O SP1 Relay Com SP1 RELAY N/C SP2 or ALarm Relay N/O SP2 or ALarm Relay Com SP2 or ALarm Relay N/C

Connector

Terminal

1 6 2 11 12 13 14 15 10 5

Cable Color

Brown

Yellow

Black Red Vilolet

Grey White

Blue

Green Orange

NOTES:

1. If 12-24 VDC power is used, the polairty is unimportant.

2. Wire in accordance with an equivalent national standard or code. Use copper conductors only rated for 60°C.

3. All terminals are rated CLASS 2.

4. ISOLATION: All inputs and outputs to each other: 500 VAC.

5. 4-20 mA Transmitter – Check the specications for the device receiving this signal for input resistance. Typical 250 to 600 OHMS, 600 OHMS maximum.

SP1

FRONT PANEL

SP2

ALLO

ALHI

INWC

SP2 DESCRIPTOR

SP1 DESCRIPTOR

MULTIPLIER

DESCRIPTOR

VISABLE WITH

SOME VELOCITY

AND FLOW

RANGES

X1K

1.000

SP/AL

KEY FUNCTIONS Keys Home Position Function Main Menu Function Sub Menu Function

SP/AL

ARROW

DOWN

ARROW

ENTER

RESET

Sequences the display

SP/AL

through SET POINT and

ALARM settings Allows access to the

menus

Displays full scale range of unit

Clears or resets an Alarm

RST

(alarm set for manual reset)

Return to home position

Sequences through

menus

Sequences through

menus

Enter into SUB MENU

RST

Return to home position

Return to previous 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.

ALARM DESCRIPTOR

UNITS

INPUT VALUE

+ 14 hidden pages