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DH-017

DHII-002

Series DH Digihelic® Differential Pressure Controller

3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow

The Series DH Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output. The Digihelic® controller is the ideal instrument for pressure, velocity and flow applications, achieving a 0.5% full scale accuracy on ranges from 0.25 to 100 in. w.c.

The Digihelic® controller allows the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. Two SPDT control relays with adjustable dead bands are provided along with a scalable 4-20 mA process output. In velocity of flow modes, a square root output is provided on the 4-20 mA signal to coincide with the actual flow curve. The Series DH provides extreme flexibility in power usage by allowing 120/220 VAC or 24 VDC power which is often used in control panels.

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 readings; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your application's range; Modbus® communications; and field calibration. With all this packed into one product it is easy to see why the Digihelic® controller is the only instrument you will need for all your pressure applications.

NIST CALIBRATION available in Product Configurator.

Product Applications

SCFM duct flow
Industrial ovens air flow
Filter status
Clean room pressurization
Fume hood air flow
Surgical and medical room pressurization
Damper and fan control

Starting at $794.00

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Grouped product items
Model	Description	Availability*	Price
DH-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.	Less Than 1 Week*	$1,032.00
DH-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.	1-3 days*	$1,032.00
DH-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.	1-3 days*	$794.00
DH-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.	Less Than 1 Week*	$794.00
DH-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.	Less Than 1 Week*	$794.00
DH-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.	Less Than 1 Week*	$794.00
DH-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.	Less Than 1 Week*	$794.00
DH-012	Differential pressure controller, range 0-25-0-0.25" w.c. NOTE: velocity & volumetric flow not available.	Less Than 1 Week*	$1,032.00
DH-014	Differential pressure controller, range 1.0-0-1.0" w.c. NOTE: velocity & volumetric flow not available.	Less Than 1 Week*	$1,032.00
DH-015	Differential pressure controller, range 2.5-0-2.5" w.c. NOTE: velocity & volumetric flow not available.	1-3 days*	$794.00
DH-016	Differential pressure controller, range 5-0-5" w.c. NOTE: velocity & volumetric flow not available.	Less Than 1 Week*	$794.00
DH-017	Differential pressure controller, range 10-0-10" w.c. NOTE: velocity & volumetric flow not available.	Less Than 1 Week*	$794.00

Specifications

Service:: Air and non-combustible, compatible gases.
Wetted Materials:: Consult factory.
Housing Material:: ABS plastic, UL approved 94 V-0.
Accuracy:: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
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.
Display:: 4 digit LCD 0.4" height. LED indicators for set point and alarm status.
Electrical Connections:: Screw terminals.
Process Connections:: Compression fitting for use with 1/8" ID X 1/4" OD tubing (3.175 mm ID x 6.35 mm OD). Optional barbed fitting for 3/16" ID tubing.
Enclosure Rating:: Face designed to meet NEMA 4X (IP66).
Mounting Orientation:: Mount unit in horizontal plane.
Size:: 1/8 DIN.
Panel Cutout:: 1.772 x 3.620 in (45 x 92 mm).
Weight:: 14.4 oz (408 g).
Serial Communications:: Modbus® RTU, RS485, 9600 Baud.
Compliance:: 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

3-in-1 instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
Velocity of flow modes, a square root output coincides with the actual flow curve for greater precision
Power usage of 120/220 VAC or 24 VDC provides flexibility to incorporate device in control panel
Secure menu program provides access to device operation only for the right skill level
Modbus® communications supports Process and HVAC system integration and control

Support Library

Approvals

Drawings

Model Chart

EXAMPLE	DH	002	B	Series DH-002-B Digihelic® Differential Pressure Controller, range 0.25" w.c., with barb fittings.
SERIES	DH			Digihelic® Differential Pressure Controller
RANGE		002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017		0.25" w.c. 0.5" w.c. 1" w.c. 2.5" w.c. 5" w.c. 10" 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			B NIST	Barb Fittings NIST Certificate of Calibration

FAQ

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. Series' 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. Series' EDA, DPG-200, DPT, and MDPC possess high/low set points, digital gage display and 4-20 mA full scale output signal for compatible fluids.

Related

Series DHII

Series DPT

Series EDA

Series DH

Series DH3

Series MDPC

Series DPG-200

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.

Related

Series 2-5000

Series 2000-SP

Series DHII

Series DH3

Series DH

Series 2000

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 Digihelic® Modbus® Register List under Support Library to download this list of protocol.

Related

Model Digihelic Links

Series DHII

Series DH

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.

Related

Series DH3

Series DH

Series DHII

Question

I have a digihelic DH007. and I would like to know is: could I filter the output relay signal (set point)? Does the delay or dampening functions work on the output or just on the alarms?

Answer

You can use the Dampening sub menu to stabilize the display from instabilities due to things such as vibration and excessive pressure fluctuations. This dampening feature will adjust the amount of readings which are averaged for each display update. The Digihelic DP controller does not have a feature like the “ALDL” Alarm delay for the relay output though. However, if you use the dampening feature, it will not fluctuate as much and therefore would not cause the reading to surpass the set point and activate the switch unless it truly is reading that pressure.

Related

Series DH

Reviews

Accessories

Model	Description	Availability*	Price
A-203	Clear PVC tubing, 1/8" ID x 1/4" OD, lengths to 100'.	1-3 days*	$3.85
A-266	Digihelic® controller surface mounting bracket	1-3 days*	$44.15
DIGIHELIC LINKS	Communication software CD	1-3 days*	$101.00
MN-1	Mini-Node™ RS-485 to USB converter	Call for Details*	$115.35