DH_II

Dwyer Series DHII Digihelic® Differential Pressure Controller

$ 505.00–$ 654.00

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Product Description

NEMA 4 (IP66) Housing with Large, Bright LCD, Square Root Output for Flow

The Digihelic® Controller just got better with the New Series DHII Differential Pressure Controller. The DHII takes all the fabulous features of the standard Digihelic® Pressure Controller and packages them in a robust NEMA 4 (IP66) housing.

The Digihelic® II Pressure Controller combines the 2 SPDT control relays, 4-20 mA process output and Modbus® communications with a large, brightly backlit 4 digit LCD display that can easily be seen from long distances. The electrical wiring has also been enhanced in the DHII with its detachable terminal blocks. The removable terminals allow the install to easily wire the terminal block outside the housing and then attach to the circuit board, reducing wiring difficulties and installation time on the process.

The Digihelic® II Differential Pressure Control in the new NEMA 4 (IP66) enclosure enables this product to be the perfect choice when mounting pressure controls outdoors in such applications as rooftop air handlers. This housing also makes it the ideal solution for surface mounting in clean rooms or facilities where water or a cleaning solution is utilized in maintaining plant cleanliness.

Product Applications

  • Air Handlers
  • Clean Rooms

Models

Model Description
DHII-002 Differential pressure controller, selectable engineering units: .2500″ w.c., 6.350 mm w.c., 0.635 cm w.c., 0.467 mm Hg, 0.623 mbar, 62.28 Pa, 0.623 hPa, 0.114 oz/in².
DHII-004 Differential pressure controller, selectable engineering units: 1.000″ w.c., 25.40 mm w.c., 1.868 mm Hg, 2.491 mbar, 249.1 Pa, 0.249 kPa, 2.491 hPa, 0.578 oz/in².
DHII-006 Differential pressure controller, selectable engineering units: 5.000″ w.c., .4167 ft w.c., 127.0 mm w.c., 12.70 cm w.c., .1806 psi, .3678″ Hg, 9.342 mm Hg, 12.45 mbar, 1245 Pa, 1.245 kPa, 12.45 hPa, 2.890 oz/in².
DHII-007 Differential pressure controller, selectable engineering units: 10.00″ w.c., .8333 ft w.c., 254.0 mm w.c., 25.40 cm w.c., .3613 psi, .7356″ Hg, 18.68 mm Hg, 24.91 mbar, 2491 Pa, 2.491 kPa, 24.91 hPa, 5.780 oz/in².
DHII-008 Differential pressure controller, selectable engineering units: 25.00″ w.c., 2.083 ft w.c., 635.0 mm w.c., 63.50 cm w.c., .9032 psi, 1.839″ Hg, 46.71 mm Hg, 62.27 mbar, 6227 Pa, 6.227 kPa, 62.27 hPa, 14.45 oz/in².
DHII-009 Differential pressure controller, selectable engineering units: 50.00″ w.c., 4.167 ft w.c., 1270 mm w.c., 127.0 cm w.c., 1.806 psi, 3.678″ Hg, 93.42 mm Hg, 124.5 mbar, 12.45 kPa, 124.5 hPa, 28.90 oz/in². NOTE: velocity & volumetric flow not available.
DHII-010 Differential pressure controller, selectable engineering units: 100.0″ w.c., 8.333 ft w.c., 2540 mm w.c., 254.0 cm w.c., 3.613 psi, 7.356″ Hg, 186.8 mm Hg, 249.1 mbar, 24.91 kPa, 249.1 hPa, 57.80 oz/in². NOTE: velocity & volumetric flow not available.
DHII-012 Differential pressure controller, range 0-25-0-0.25″ w.c. NOTE: velocity & volumetric flow not available.
DHII-014 Differential pressure controller, range 1.0-0-1.0″ w.c. NOTE: velocity & volumetric flow not available.
DHII-015 Differential pressure controller, range 2.5-0-2.5″ w.c. NOTE: velocity & volumetric flow not available.
DHII-016 Differential pressure controller, range 5-0-5″ w.c. NOTE: velocity & volumetric flow not available.
DHII-017 Differential pressure controller, range 10-0-10″ w.c. NOTE: velocity & volumetric flow not available.

Specifications

Service:
Air and non-combustible,
compatible gases.
Wetted Materials:
Consult factory.
Housing Material:
Aluminum, glass.
Accuracy:
±0.5% at 77°F (25°C)
including hysteresis and
repeatability (after 1 hour warmup).
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:
High voltage power = 100 to 240
VAC, 50 to 400 Hz or 132 to 240
VDC; Low voltage power = 24
VDC ±20%.
Power Consumption:
Low voltage power = 24 VDC –
130 mA max; High voltage power
= 100 to 240 VAC, 132 to 240
VDC – 7VA max.
Output Signal:
4-20 mA DC into
900 Ω max.
Zero & Span Adjustments:
Accessible via menus.
Response Time:
250 ms (dampening set to 1).
Display:
4 digit backlit LCD 0.6″
height. LED indicators for set point
and alarm status.
Electrical Connections:
Euro type removable terminal blocks
with watertight conduit fittings for
1/2″ watertight conduit.
Process Connections:
1/8″ female NPT.
Enclosure Rating:
Designed to meet NEMA 4 (IP66).
Mounting Orientation:
Mount unit in horizontal plane.
Weight:
2 lb 10 oz (1.19 kg).
Serial Communications:
Modbus® RTU, RS485, 9600 Baud.
Agency Approvals:
CE, UL.

SWITCH SPECIFICATIONS
Switch Type:
2 SPDT relays.
Electrical Rating:
8 amps at 240 VAC resistive.
Set Point Adjustment:
Adjustable via keypad on face.

Features

  • NEMA 4 housing enables a range of uses both outdoors or indoors where water is present
  • Large backlight LCD display provides local reading from a distance
  • Detachable terminal blocks reduce wiring difficulties saving installation time

Literature

Manuals

Instruction Manual

Catalog Pages

Series DHII Catalog Page

Approvals

Drawings

Accessories

Model Number Description
A-438 Surface mounting bracket.
Mini-Node™ RS-485 to USB converter. MN-1 Mini-Node™ RS-485 to USB converter.
Communication software CD. DIGIHELIC LINKS Communication software CD.
4 A-489 4″ 303 SS straight static pressure tip with flange.
Static pressure tip, for 1/4 A-301 Static pressure tip, for 1/4″ metal tubing connection.
Static pressure tip, for 3/16 A-302 Static pressure tip, for 3/16″ and 1/8″ ID plastic or rubber tubing.
303SS static pressure tip with mounting flange, 4 A-302F-A 303SS static pressure tip with mounting flange, 4″ hook style. For 3/16″ ID rubber or plastic tubing, includes mounting screws.

Model Chart

EXAMPLE DHII 002 NIST Series DHII-002-NIST Digihelic® Differential Pressure Controller, range 0.25″ w.c., with NIST Traceable Calibration Certificate.
SERIES DHII     Digihelic® Differential Pressure Controller
RANGE   002
004
006
007
030
008
009
010
011
012
013
014
015
016
017		   .25″ w.c.
1″ w.c.
5″ w.c.
10″ w.c.
15″ w.c.
25″ w.c.
50″ w.c.
100″ w.c.
0.10-0-0.10″ w.c.
0.25-0-0.25″ w.c.
0.50-0-0.50″ w.c.
1.00-0-1.00″ w.c.
2.50-0-2.50″ w.c.
5.00-0-5.00″ w.c.
10.00-0-10.00″ w.c.
OPTIONS     COO
FC
NIST		 Certificate of Calibration
Factory Calibration
NIST Traceable Calibration Certificate

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