Overview
The Dwyer 43230S is a Series 43000 Capsu-Photohelic pressure switch gage that merges reliable pressure measurement with integrated switching control. Built with an encapsulated sensing element, the Dwyer 43230S handles both gases and liquids at pressures to 500 psig (34 bar), making it ideal for industrial HVAC, pneumatic, and hydraulic applications. The unit employs proven Magnehelic gage design technology for consistent, repeatable performance in demanding environments.
Key Features
- Dual-Relay Control: Two phototransistor-actuated DPDT relays enable simultaneous low and high limit monitoring with variable deadband control—ideal for pump operation and system protection.
- Encapsulated Sensing Element: Employs an encapsulated sensing element for use with both liquids and gases at pressures to 500 psig (34 bar), with optional brass case for water-based applications.
- Knob-Adjusted Set Points: Easy to adjust set point indicators are controlled by knobs located on the gauge face, with individual set point deadband of one pointer width—less than 1% of full scale.
- Interlock Deadband Control: Set points can be interlocked to provide variable deadband—ideal for control of pumps.
- Gage-Independent Reading: Gage reading is unaffected by switch operation, ensuring continuous pressure visibility during relay activation.
Technical Specifications
- Pressure Range: 0–500 psig (0–34 bar) standard
- Media: Air, non-combustible gases, and compatible liquids
- Accuracy: ±3% of FS at 70°F (21.1°C); ±2% on 43000S models
- Relay Type: 2× DPDT (Form C), phototransistor-actuated
- Set Point Deadband: Less than 1% of full scale (one pointer width)
- Wetted Materials: Consult manufacturer for specific application requirements
- Connection: Standard NPT female (verify model-specific size)
- Case Material: Standard steel; optional brass case for water applications
Typical Applications
- Pump discharge pressure control and protection
- Compressor or blower motor cutoff
- Hydraulic system pressure monitoring with dual set-point alarms
- HVAC air differential pressure control
- Industrial process fluid and gas pressure management
- Equipment protection circuits requiring low/high limit switching
Compatibility & Replacements
Compatible With
- 24 VDC, 120 VAC, and 240 VAC control circuits (relay-actuated; consult documentation for voltage ratings)
- Standard industrial pneumatic and hydraulic system architectures
- Pressure ranges from 0.5 in W.C. to 500 psig
- UL-approved industrial control panels (when used as unlisted component per UL specifications)
Replaces / Drop-In Replacement For
- Other Series 43000 Capsu-Photohelic variants (43200, 43215, etc. — verify specific pressure range and relay configuration)
- Standard mechanical pressure switches requiring dual set-point control and integrated gage readout
- Legacy Dwyer differential pressure switch/gage models in compatible pressure ranges
Works With
- Industrial PLC and control system relay inputs
- Motor control circuits, pump starters, and solenoid valve drivers
- HVAC and process automation networks utilizing discrete switch signals
- Magnehelic gage-based pressure monitoring systems (compatible sensor family)
