Overview
The Dwyer Model 43000-0 Capsu-Photohelic pressure switch gage integrates analog dial measurement with electronic relay switching for dual-setpoint pressure control. This unit employs an encapsulated sensing element compatible with both gases and liquids, making it ideal for HVAC, process control, and industrial monitoring where simultaneous visual indication and electrical switching are required.
Key Features
- Dual DPDT Relay Outputs: Two form C relays enable independent low/high pressure setpoint control with ±1% repeatability
- Encapsulated Sensing Element: Allows operation with compatible gases and liquids across 0–500 psig full-scale ranges
- Phototransistor Technology: LED-based sensing with helix-driven light shield ensures chatter-free operation with 1% or less deadband
- Adjustable Setpoints: Front-panel knobs allow easy configuration without recalibration
- Multiple Pressure Ranges: Available in ranges from 0.5 in w.c. to 6000 psig full scale
- Electrical Flexibility: Power options include 120 VAC, 240 VAC, or 24 VAC at 50/60 Hz
Technical Specifications
Pressure Performance: -20 Hg to 500 psig (-0.677 to 34.5 bar) standard range; custom ranges available to 6000 psig full scale. Accuracy: ±3% of full scale at 70°F.
Electrical Characteristics: 10 A @ 120 VAC, 6 A @ 240 VAC, 60 Hz rated. Screw terminal connections. Power requirements: 120 VAC, 50/60 Hz; 240 VAC and 24 VAC available as options.
Physical: 4-inch dial face; 5-inch OD × 9-3/16-inch height. Weight: 5 lb, 8 oz (2.49 kg). Process connection: 1/4-inch female NPT.
Environmental: Operating temperature: 20 to 120°F (-6.67 to 48.9°C). Low temperature option available. Mounting orientation: diaphragm in vertical position.
Typical Applications
- HVAC system pressure monitoring and control
- Pneumatic and hydraulic system setpoint switching
- Gas and liquid process pressure regulation
- Low/high pressure alarm and interlock systems
- Manufacturing and automation equipment pressure supervision
- Water and air pressure limit control (brass case option for water service)
Compatibility & Replacements
Compatible With
- Standard industrial relay logic and PLC input modules (via dry contact closure)
- 24 VAC/VDC or 120/240 VAC power supplies
- Any system requiring form C (DPDT) dry contact switching
- Pneumatic and hydraulic control circuits
- HVAC and building automation systems
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The Model 43000-0 is the base configuration; variant numbers (e.g., 43000-2, 43000-3, 43000-4) denote different pressure ranges or options.
Works With
- DPDT relay logic circuits and industrial control panels
- Standard dry-contact input modules on PLCs and controllers
- Pneumatic valve pilot circuits
- Hydraulic proportional valve control systems
- Building automation and HVAC management systems
