Series DHII Digihelic® Differential Pressure Controller

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

The SERIES DHII takes all the 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 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 & Ordering

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Model Description Usually Ships Price Order
DHII-002
Ships: Next Day
Price: $668.00
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. Next Day $668.00 Order
DHII-004
Ships: Next Day
Price: $668.00
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. Next Day $668.00 Order
DHII-006
Ships: Next Day
Price: $516.00
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. Next Day $516.00 Order
DHII-007
Ships: Next Day
Price: $516.00
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. Next Day $516.00 Order
DHII-008
Ships: Next Day
Price: $516.00
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. Next Day $516.00 Order
DHII-009
Ships: Next Day
Price: $516.00
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. Next Day $516.00 Order
DHII-010
Ships: Next Day
Price: $516.00
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. Next Day $516.00 Order

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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 - 7 VA 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

Accessories

Model Number Description Usually Ships Price Order
A-438 Surface mounting bracket. 1-2 Weeks $12.50 Order
Mini-Node™ RS-485 to USB converter. MN-1 Mini-Node™ RS-485 to USB converter. Next Day $77.50 Order
Communication software CD. DIGIHELIC LINKS Communication software CD. Next Day $51.50 Order
4 A-489 4" 303 SS straight static pressure tip with flange. Next Day $6.67 Order
Static pressure tip, for 1/4 A-301 Static pressure tip, for 1/4" metal tubing connection. Next Day $9.90 Order
Static pressure tip, for 3/16 A-302 Static pressure tip, for 3/16" and 1/8" ID plastic or rubber tubing. Next Day $9.10 Order
303 SS Static pressure tip with mounting flange, for 3/16 A-302F-A 303 SS Static pressure tip with mounting flange, for 3/16" I.D. rubber or plastic tubing. 4" insertion depth, includes mounting screws Next Day $9.20 Order

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
NIST
Certificate of Origin
NIST Traceable Calibration Certificate

Product Literature

Manuals

Catalog Pages

Approvals

Drawings

Questions

Question
A customer would like to get switching capability, local pressure indication, and a 4-20 mA output signal all in one device. Do we have a product to offer them?
Answer
Yes. The DH, DHII or DH3 possess high/low set points, digital gage display and 4-20 mA full scale output signal for air and compatible gas. The EDA, DPG-200, DPT and the MDPC possess high/low set points, digital gage display and 4-20 mA full scale output signal for compatible fluids.
Question
Your Magnehelic gauge doesn't come with a calibration certificate, do you have any documentation for these gauges to meet these needs?
Answer
We have 3 options: (1) We can supply a Certificate of Conformance at no charge if you request that certificate at the time of order. The Certificate of conformance would state that each Magnehelic gauge is calibrated to meet the specifications stated on the spec sheet. (2) We offer a factory calibration “-FC” as an option that is a certificate of the standard calibration points at the time of manufacture, for a small fee. (3) We can also provide a NIST-traceable calibration for an extra charge per gage if that is required. To get the NIST-traceable calibration, you would simply add a “-NIST” to the end of your part number. NIST-traceable calibrations will come with the 6 point calibration certificate. We recommend “periodic calibration” for our Magnehelic, though we leave the specific time-frame up to the end user, since different organizations have different requirements (i.e. government groups often require more frequent calibrations.) If you choose to have the NIST traceable calibration done, the NIST group (the National Institute of Standards and Technology) dictates yearly calibration and it will be printed on the certificate.
Question
Looking for information on the RS-232 Serial Communications Digihelic Links™ Communications Software, Modbus protocol®. Specifically command format, commands available, and controller responses?
Answer
Click on Modbus® to download this list of protocol.
Question
I am using DH3 Digihelic differential pressure controllers for my applications. The instruction says that "the Alarm can be reset by the RESET key on the front panel, or an external reset switch". For the second case (reset by external reset switch), could you let me know how to do it? The instruction doesn't provide any related detail. Thanks in advance.
Answer
Unfortunately, contrary to what was printed in the instruction manual, the DH3 does not have the ability for the alarm to be reset via an external reset switch, mainly due to the limited number of pins available in the electrical connector. This feature is only available in the DH and DHII series Digihelics.

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