Honeywell

1.Functions

Mechanical pressure sensing: Adopt stainless steel bellows sensing element to detect gauge pressure of gas or liquid medium. Convert pressure change into mechanical displacement to trigger SPDT microswitch action.www.plcva.com
Pressure threshold monitoring: Trigger electrical contact ON/OFF when pressure reaches preset high or low limit; setpoint can be calibrated and locked on site.
Safety interlock output: Provide switch signal for alarm or equipment shutdown; support overpressure protection and low-pressure protection.
Robust mechanical design: Seawater-resistant die-cast aluminium housing, IP54 protection rating; withstand harsh industrial environments.
Long service life: Validated for up to 2 million switching cycles; burst pressure ≥100 bar.
Certified safety device: TÜV and DVGW approved, compliant with European pressure equipment directive.
Pressure port: G1/2 external thread / G1/4 internal thread; electrical connection via DIN EN175301 plug or screw terminals.www.plcva.com

Honeywell DWR3-301 Physical photo

Honeywell DWR3-301 Physical photo

This is a safety-class mechanical pressure switch for boiler, burner and thermal system pressure supervision.www.plcva.com

Industries: Thermal power, heating plants, oil & gas, boiler room, industrial furnace, fuel gas system.
Monitored media: Fuel gas, fuel oil, steam, hot water.
Typical scenarios:
- Max / minimum pressure monitoring for steam boilers and hot water boilers.
- Pressure limit protection for gas burners and fuel supply pipelines.
- Safety interlock: Cut off fuel supply or trigger alarm once pressure exceeds safe threshold.
Working principle: Interlock with burner / boiler control system to prevent dangerous overpressure or insufficient fuel pressure.