Series DH: 3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output.

Series DHII: NEMA 4 (IP66) Housing with Large, Bright LCD, Square Root Output for Flow Digihelic® II Differential 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.

Series DHC: 3-in-1 Differential Pressure Controller Differential pressure controller combining 3 features allowing the reduction of several instruments with one product, saving inventory, installation time, and cost.

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.

Related

Series DHII

Series DPT

Series EDA

Series DH

Series DH3

Series MDPC

Series DPG-200

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

Related

Series DHII

Series DH

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 calib

Related

Series 2-5000

Series 2000-SP

Series DHII

Series DH3

Series DH

Series 2000

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

Videos

Liquid in your Housing? How to Prevent Conduit Condensation