Dwyer DHC Series Digihelic Differential Pressure Controller
BENEFITS/FEATURES
- One instrument saves inventory, installation time, and money with its measurement versatility and innovative 3-in-1 design
- Measurement precision via full-scale accuracy of 1.5% or better on extremely low ranges, and 0.5% for ranges at or above 1 in w.c.
- Safe and secure with security menu programming
- Simplified field upgrade to DHC pressure controller with optional stainless steel bezel
APPLICATIONS
- SCFM duct flow
- Filter status
- Duct or building static pressure
- Damper and fan control
DESCRIPTION
The Series DHC Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with both current and voltage outputs. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time, and cost. The Series DHC Digihelic® differential pressure controller is the ideal instrument for pressure, velocity, and volumetric flow applications reading in several commonly used engineering units with optional unidirectional or bidirectional ranges. These units achieve a 1.5% or better accuracy on extremely low ranges, and 0.5% accuracy for ranges at or above 1 in w.c. Calibration can be performed in the field, making maintaining its accuracy more manageble. Additionally, the Series DHC Digihelic® differential pressure controller includes 2 SPDT control relays with adjustable deadbands. Programming the unit is simple using the built-in menu. With scalable 4-20 mA, selectable voltage process outputs, and selectable Modbus® or BACnet communication, this controller can easily fit into your application.
SPECIFICATIONS
| Service | Air and non-combustible, compatible gases. |
| Wetted Materials | Consult factory. |
| Housing Material | Polycarbonate. |
| Accuracy | ±0.5% FSO for all ranges, except 0.5 in w.c. @ ±1% FSO, and ranges at or below ±0.25 in w.c. @ ±1.5% FSO. |
| Stability | < ±1% / year FSO. |
| Pressure Limits | Ranges > 1 in w.c.: 6 psi max operation, 6 psi burst; Ranges ≤ 1 in w.c.: 3.6 psi max operation, 6 psi burst. |
| Temperature Limits | -4 to 158°F (-20 to 70°C). |
| Thermal Effects | .02% FS / °F (.036% FS / °C). |
| Power Requirements | 12-28 VDC or 12-28 VAC 50 to 400 Hz. |
| Power Consumption | 3 VA max. |
| Output Signal | 4-20 mA (4-wire); 0-10 V, 0-5 V, 1-5 V, and 2-10 V (4-wire). |
| Communication | BACnet MS/TP or Modbus® RTU. |
| Supported Baud Rate | 9600, 19200, 38400, 57600, 76800, 115200. |
| Device Load | 1/8 unit load. |
| Zero and Span Adjustments | Accessible via menus. |
| Response Time | 400 ms (damping set to 0). |
| Display | Backlit LCD display, LED setpoint indicators. |
| Electrical Connections | 15 pin male high density D-sub connection. 18˝ (46 cm) cable with 15 conductors included. |
| Process Connections | 1/8˝ female NPT ports on side and back. |
| Enclosure Rating | NEMA 4X (IP66). |
| Mounting Orientation | Not position sensitive. |
| Size | 5˝ OD (127 mm) x 1.9˝ (48 mm) deep. |
| Weight | 8.8 oz (250 g). |
| Compliance | BTL, CE. |
SWITCH SPECIFICATIONS
| Switch Type | 2 SPDT relays. |
| Electrical Rating | 1 A @ 30 VAC/VDC. |
| Set Point Adjustment | Accessible via menus. |
DIMENSIONS
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
ACCESSORIES
| Model | Description |
| A-299 | Surface mounting bracket |
| A-300 | Flat flush mounting bracket |
| A-301 | Static pressure tip for 1/4˝ metal tubing connection |
| A-302 | Static pressure tip, for 3/16˝ and 1/8˝ ID plastic or rubber tubing. |
| 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 |
| A-330 | 1/8˝ pipe plug, socket hex, plated steel. |
| A-331 | 1/8˝ NPT filter vent plug, nylon and sintered metal |
| A-489 | 4˝ straight static pressure tip with flange |
OORDER ORDER ONLNLINE TINE TOODDAYAY!!
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©Copyright 2022 Dwyer Instruments, LLC Printed in U.S.A. 6/22
Important Notice: Dwyer Instruments, LLC reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
Documents / Resources
 | Dwyer DHC Series Digihelic Differential Pressure Controller [pdf] User Manual DHC Series Digihelic Differential Pressure Controller, DHC Series, Digihelic Differential Pressure Controller, Digihelic Pressure Controller, Differential Pressure Controller, Pressure Controller, Controller |
