Dwyer Instruments DH3 Series Installation And Operating Instructions Manual

Series DH3 Digihelic® Differential
Pressure Controller

Specications - Installation and Operating Instructions

Bulletin B-30

®

DWYER INSTRUMENTS, INC.

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

Phone: [phone]
Fax: [phone]

dwyer-inst.com
e-mail: [e-mail]

DIMENSIONS

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.

SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.

Electrical Rating: 1 amp @ 30 VAC/VDC.

Set Point Adjustment: Adjustable via keypad on face.

(4) 6-32 HOLES

EQUALLY SPACED ON A

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

PANEL MOUNTING

1/8 FEMALE NPT LOW

PRESSURE CONNECTION

1/8 FEMALE NPT HIGH

PRESSURE CONNECTION

2-1/16

[52.39]

2

[50.80]

1-1/4

[31.75]

ø4-47/64

[120.25]

Ø5

[127.00]

Ø4 [101.60]

FACE

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

MOUNTING RING

5/8 [15.88]

PANEL MAX

2-1/2

[63.50]

3/16

[4.76]

1/8 FEMALE NPT HIGH
PRESSURE CONNECTION

1/2

[12.70]

1-9/32

[32.54]

11/16

[17.46]

30°

1-3/4

[44.45]

1/2

[12.70]

11/16

[17.46]

1/8 FEMALE NPT LOW

PRESSURE CONNECTION

(3) Ø3/16 [4.77] HOLES EQUALL

Y

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

SURFACE MOUNTING

INSTALLATION
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.

Figure A

1-1/2

[38.1]

5/16

[7.94]

11/16

[17.46]

3/4

[19.05]

1-3/32

[27.78]

1-3/4

[44.45]

1/2 [12.70]

(3) Ø3/16 [4.77] HOLES

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

Ø1/2 [12.70] HOLE FOR

LOW PRESSURE CONNECTION

Ø1/2 [12.70] HOLE FOR
HIGH PRESSURE CONNECTION

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

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.

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.

Ø4-3/4 [120.65] HOLE

PNEUMATIC
PRESSURE T

APS

SNAP RING

GROOVE

Figure B

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.

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.

Function

15 PIN

Connector

Terminal

Cable
Color

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

1
6
2
11
12
13
14
15
10
5

Brown

Yellow

Black
Red
Vilolet

Grey
White

Blue

Green
Orange

INWC

1.000

SP1

SP2

ALHI

ALLO

SP/AL

RST

MENU

E

X1K

FRONT PANEL

ALARM
DESCRIPTOR

UNITS

INPUT VALUE

MULTIPLIER

DESCRIPTOR

VISABLE WITH

SOME VELOCITY

AND FLOW

RANGES

SP2 DESCRIPTOR

SP1 DESCRIPTOR

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

SP/AL

Sequences the display
through SET POINT and

ALARM settings

Return to home
position

Return to home
position

MENU

Allows access to the
menus

Return to home
position

Return to previous
menu

UP

ARROW

Sequences through

menus

Increments a value

DOWN

ARROW

Sequences through

menus

Decrements a value

ENTER

Displays full scale
range of unit

Enter into
SUB MENU

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.

RESET

Clears or resets an Alarm
(alarm set for manual
reset)

Peak/Valley SUB
MENU resets display

to present value.

SP/AL

E

MENU

RST