Dwyer Digihelic II differential pressure controller, 2 relays, 4–20 mA, Modbus, NEMA 4 housing
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Quick overview
- Type: Calibration equipment
- Signal / Protocol: 4–20 mA, Modbus, RS-485, Relay / switch
- Hazardous area: General purpose
- Genuine productsSourced from the manufacturer or authorised channels
- Delivery across BangladeshDhaka, Chattogram and all industrial zones
- After-sales supportInstallation guidance and warranty handling
- Reply within 24 hoursCall +880 1713 552466 or email hello@argonmark.com
Specifications
| General | |
|---|---|
| Part no. | BD-1514 |
| Category | Oil & Gas Instruments |
| Group | Instrumentation & Control |
| Brand | Dwyer |
| Model | Digihelic II (DHII) |
| Technical | |
| Type | Calibration equipment |
| Signal / Protocol | 4–20 mA, Modbus, RS-485, Relay / switch |
| Hazardous area | General purpose |
Datasheet
Technical features
| Measures differential pressure, velocity or volumetric flow (square root output) of air and non-combustible gases | |
| Two SPDT control relays with keypad set points; LED set point and alarm indication | |
| 4–20 mA process output and Modbus RTU (RS485) | |
| Large backlit display readable from a distance; selectable engineering units | |
| Detachable terminal blocks and watertight conduit fittings for easy wiring | |
| NEMA 4 housing for outdoor rooftop units and wash-down clean rooms |
Applications
| Air handling units and rooftop HVAC | |
| Clean room pressurization | |
| Filter differential pressure and duct airflow control |
Key specifications
| Ranges | 0–0.25 in w.c. (62 Pa) to 0–100 in w.c. (24.9 kPa); bi-directional options |
|---|---|
| Accuracy | ±0.5% at 25 °C |
| Outputs | 2 SPDT relays (8 A 240 V AC), 4–20 mA, Modbus RTU |
| Display | 4-digit backlit LCD, 15 mm |
| Power | 100–240 V AC / 132–240 V DC or 24 V DC |
| Enclosure | Aluminium and glass, NEMA 4 (IP66) |
Specification
| Service | Air and non-combustible, compatible gases |
|---|---|
| Accuracy | ±0.5% at 25 °C incl. hysteresis and repeatability |
| Stability | < ±1% per year |
| Pressure limits | ≤ 2.5 in w.c. ranges: 2 psi; 5–50 in w.c.: 5 psi; 100 in w.c.: 9 psi |
| Temperature limits | 0 to 60 °C (compensated 0–60 °C); thermal effect 0.036%/°C |
| Power | 100–240 V AC 50–400 Hz or 132–240 V DC, 7 VA; or 24 V DC ±20%, 130 mA |
| Output | 4–20 mA into 900 Ω max. |
| Relays | 2 SPDT, 8 A at 240 V AC resistive |
| Communication | Modbus RTU, RS485, 9,600 baud |
| Display | 4-digit backlit LCD, 15 mm; LED set point/alarm indicators |
| Connections | 1/8 in NPT female process; removable terminal blocks, ½ in conduit fittings |
| Enclosure | Aluminium, glass; NEMA 4 (IP66); mount horizontally |
| Weight | 1.19 kg |
| Approvals | CE, UL |
Ranges
| Model | Range |
|---|---|
| DHII-002 | 0–0.25 in w.c. (62 Pa) |
| DHII-004 | 0–1 in w.c. (249 Pa) |
| DHII-006 | 0–5 in w.c. (1.25 kPa) |
| DHII-007 | 0–10 in w.c. (2.49 kPa) |
| DHII-008 | 0–25 in w.c. (6.23 kPa) |
| DHII-009 | 0–50 in w.c. (12.45 kPa) |
| DHII-010 | 0–100 in w.c. (24.9 kPa) |
| DHII-012 to -017 | Bi-directional ±0.25 to ±10 in w.c. |
Notes
| Data from the manufacturer's published datasheet. Confirm model, range, materials and approvals with Argonmark before ordering. |
Photo: courtesy of Dwyer, used with permission (source) — background removed by Argonmark. All photo credits
Description
The Dwyer Digihelic II is a differential pressure controller for air and non-combustible gases, housed in a NEMA 4 (IP66) aluminium enclosure for outdoor or wash-down locations. It covers ranges from 0–0.25 in w.c. (62 Pa) to 0–100 in w.c. (about 25 kPa), including bi-directional ranges, with ±0.5% accuracy, and can display pressure, velocity or volumetric flow.
Two SPDT relays (8 A) handle control and alarms, and a 4–20 mA output and Modbus RTU link it to the control system. It has a large backlit LCD and removable terminal blocks, and runs on 100–240 V AC or 24 V DC.
Argonmark Ltd supplies Dwyer instruments across Bangladesh — Dhaka, Chattogram, Gazipur, Narayanganj and the gas fields, refineries, terminals and power plants beyond. Send us the model, range, process connection, output and any hazardous-area requirement, and we will confirm the right configuration, lead time and price.
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