Dwyer Instruments DH3 Specifications

Series

[

4] 6-32 HOLES

QUALLY SPACED ON A

-1/8 [130.18] B.C.

ANEL MOUNTING

1/8 FEMALE NPT LOW PRESSURE

CONNECTION

/8 FEMALE NPT

IGH PRESSURE

ONNECTION

2-1/16

[52.39]

[

50.80]

-1/4

[

31.75] ø

4-47/64

[

120.25]

Ø5

[127.00]

4 [101.60]

ACE

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

MOUNTING RING

/8 [15.88]

ANEL MAX

2-1/2

[63.50]

3/16

[4.76]

1/8 FEMALE NPT HIGH PRESSURE CONNECTION

[

12.70]

-9/32

[

32.54]

11/16

[17.46]

30°

-3/4

[

44.45]

1/2 [12.70]

1/16

[

17.46]

1/8 FEMALE NPT LOW PRESSURE

CONNECTION

[

3] Ø3/16 [4.77] HOLES

QUALLY SPACED ON A

-1/8 [104.78] B.C.

URFACE MOUNTING

P1 SP2

ALLO ALHI

DH3

Digihelic®Differential Pressure Controller

PRESSURE

Differential Pressure

Gages/Switches, Digital

possessing a digital display gage, control relay switches, and a transmitter with current output all packed in the popular Photohelic allows the reduction of several instruments with one product, saving inventory, installation time and money. The Digihelic f 0 a The Series DH3 Digihelic flow operation in several commonly used engineering units. 2 SPDT control relays with adjustable deadbands are provided along with a scalable 4-20 mA process output. Programming is easy using the menu key to access 5 simplified menus which provide access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow applications; set point control or set point and alarm operation; alarm operation as a high, low, or high/low alarm; automatic or manual alarm reset; alarm delay; view peak and valley process reading; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your applications range and field calibration.

APPLICATIONS

• SCFM flow in ducts

• Filter status

• Static pressures in ducts or buildings

• Damper control

• Fan control

Model DH3-002 DH3-003 DH3-004 DH3-005 DH3-006 DH3-007 DH3-009 *DH3-010 *DH3-011 *DH3-013 *DH3-014 *DH3-015 *DH3-016 *DH3-017 *DH3-018

*Velocity and volumetric flow not available on bi-directional range units and models DH3-010 and DH3-011.

Digihelic®Controller in Photohelic®Gage, Square Root Output for Flow

he Series DH3 Digihelic

low applications, achieving a 1% full scale accuracy on ranges down to the extremely low

.25 in w.c. to 2.5 in w.c. full scale. Ranges of 5 in w.c. and greater maintain 0.5% F.S.

ccuracy. Bi-directional ranges are also available.

Ranges

0-0.25 in w.c. 0-0.5 in w.c. 0-1 in w.c. 0-2.5 in w.c. 0-5 in w.c. 0-10 in w.c. 0-25 in w.c. 0-50 in w.c. 0-100 in w.c.

0.25-0-0.25 in w.c.

0.5-0-0.5 in w.c. 1-0-1 in w.c.

2.5-0-2.5 in w.c. 5-0-5 in w.c. 10-0-10 in w.c.

DWYER INSTRUMENTS, INC. | www.dwyer-inst.com

ifferential Pressure Controller is a 3 in 1 instrument

gage style housing. Combining these 3 features

controller is the ideal instrument for pressure, velocity and

controller allows the selection of pressure, velocity or volumetric

SPECIFICATIONS Service: Air and non-combustible, compatible gases.

etted Materials: Consult factory.

ousing Material: Die cast aluminum case and bezel.

ccuracy: ±1.5% for 0.25˝ and ±0.25˝ w.c. ranges. Ranges 0.5˝ to 5˝ w.c. and

corresponding bi-directional (except ±2.5˝ 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˝

w.c. ranges: ±0.03%/°F (±0.054%/°C).

Power Requirements: 12-28 VDC, 12-28 VAC 50 to 400 Hz. Power Consumption: 3 VA max. Output Signal: 4-20 mA DC into 900 ohms max. Zero & Span Adjustments: Accessible via menus. Response Time: 250 ms (damping 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. 4´ and 10´ cables available.

Process Connections: 1/8˝ female NPT. Side or back connections. Mounting Orientation: Mount unit in vertical plane. Size: 5˝ (127 mm) OD x 3-1/8˝ (79.38 mm). Weight: 1.75 lb (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.

ACCESSORIES A-298, Flat Aluminum Bracket for flush mounting A-301, Static Pressure Tip for 1/4˝ metal tubing connection A-302, Static Pressure Tip for 3/16˝ and 1/8˝ I.D. plastic or rubber tubing A-302F-A, 303 SS Static Pressure Tip with mounting flange. For 3/16˝ ID rubber or

plastic tubing. 4˝ insertion depth. Includes mounting screws A-370, Mounting Bracket flush mount bracket. Bracket is then surface mounted. Steel with gray hammertone epoxy finish

A-489, 4˝ Straight Static Pressure Tip with Flange

OPTIONS

For NIST traceable calibration certificate, add suffix -NIST to model numbers. Example DH3-004-NIST. For factory calibration certificate, add suffix -FC to model numbers. Example DH3-004-FC.

See page 567 for process tubing options.