Honeywell DWR06: Compact Pressure Monitor for Critical Systems

The Honeywell DWR06 family offers a compact, durable, and certified solution for pressure monitoring and limiting tasks. Its low-range sensitivity, optional adjustable differential, and internal lockout variants make it suitable for steam boilers, gas trains, hot water systems, and fuel oil lines. By choosing the correct calibration direction and optional functions, engineers can achieve both precise control and fail-safe protection. The DWR06 delivers proven reliability backed by TUV, DVGW, and SIL 2 certifications.

The Honeywell DWR06 is a reliable pressure monitor designed for fuel gases, liquid fuels, steam boilers, and hot water systems. With a setting range of 0.1 to 0.6 bar and an average switching differential of just 0.04 bar, this device delivers precise response to small pressure changes. Its maximum working pressure is 6 bar, while the TUV-verified bursting pressure exceeds 100 bar, offering a generous safety margin. Built with a stainless steel pressure bellows (1.4571) and a seawater-resistant die-cast aluminium housing, the DWR06 withstands harsh industrial environments. The pressure connection includes a G 1/2 external thread and a G 1/4 internal thread, with the internal thread permitted only up to 4 bar for gas applications. Mounting can be vertical or horizontal, and the operating temperature ranges from -25 to +70°C, with short peaks up to 85°C. This model carries the “of special construction” certification after passing 2 million operating cycles, and it meets SIL 2 according to IEC 61508-2 as well as TUV and DVGW standards.

Adjustable Differential and Versatile Configurations

For applications requiring flexible hysteresis control, the Honeywell DWR06-203 variant offers an adjustable switching differential from 0.08 to 0.5 bar. This feature allows engineers to fine-tune burner or pump cycling rates, reducing mechanical wear and optimising energy use. The standard DWR06 is factory calibrated for rising pressure, meaning the set scale value triggers switching when pressure increases, and the reset point is lower by the differential amount. If minimum pressure monitoring is needed, the DWR06-574 version is calibrated for falling pressure. The single-pole changeover microswitch handles 8A at 250VAC (resistive) and 3A at 24VDC, sufficient for most control circuits. Protection class IP54 ensures resistance to dust and water spray, making the device suitable for indoor and protected outdoor installations.

Safety Integration and Compliance

When safety shutdown and lockout are mandatory, the DWR06-205 (maximum pressure limiter) and DWR06-206 (minimum pressure limiter) add internal mechanical reclosing lockout. These versions latch after tripping and require manual reset, preventing automatic restart after a fault. The DWR series complies with key regulations including TRBS for steam systems, DIN EN12828 for hot water, DVGW G 260 for fuel gases, and DIN EN764-7 for pressure vessels. For Ex-area applications, intrinsically safe (Ex-i) and flameproof (Ex-d) versions are available. Users can also order preset switching points, custom labelling, oil-and-grease-free packaging, and test reports per EN 10204. These service functions simplify commissioning and documentation in regulated industries.

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