Overview
The Ashcroft LPDN4GGV25 is an industrial-duty pressure switch designed for applications requiring high reliability, safety, and accuracy. The Ashcroft LP pressure switch is designed for use on applications requiring high reliability, safety and accuracy, with a straightforward design that allows for easy field installation and calibration. This model combines the proven LP-Series architecture with a 15–500 psi pressure range, making it suitable for compressors, pumps, boilers, turbines, and process control systems.
Key Features
- NEMA 4 Enclosure: Features a NEMA 4 epoxy-coated enclosure, providing watertight protection against industrial washdown and spray environments.
- Viton Diaphragm Seal: Chemical-compatible elastomer suitable for mineral oils, refrigerants, and general-purpose fluids.
- 15A Contact Rating: 125/250 Vac electrical contacts rated for reliable switching in AC applications.
- Dual Independent Setpoints: Ideal for pressure control, safety shutdown or alarm operations where two independent set points or adjustable deadbands are required.
- 1/4″ FNPT Connection: Standard inlet port for easy integration into pneumatic and hydraulic systems.
- 10–23 psi Differential: Adjustable deadband for precise control and minimal hunting in cycling applications.
Technical Specifications
| Pressure Range | 15–500 psi |
| Diaphragm Material | Viton (Fluorocarbon) |
| Port Size | 1/4″ FNPT |
| Electrical Rating | 15A, 125/250 Vac |
| Deadband Range | 10–23 psi |
| Factory Default Setpoint | 90% of range (~450 psi) |
| Switch Type | SPDT snap-acting (Form C) |
| Enclosure Rating | NEMA 4, IP66 |
| Enclosure Material | Epoxy-coated aluminum |
| Actuator Type | Diaphragm-operated |
| Series | Ashcroft LP-Series |
| Accuracy | ±1% of span (typical) |
| Operating Temperature Range | –20 to +150 °F |
Typical Applications
- Air & Hydraulic Systems: Compressor unload control, pump cut-in/cut-out, pressure relief backup.
- Thermal Systems: Boiler and hot water heater overpressure protection; steam system safety shutdown.
- Industrial OEM Equipment: Injection molding machines, hydraulic presses, automated packaging lines.
- Filtration & Treatment: Reverse osmosis systems, filter clogging alarms, water treatment plant controls.
- Specialized Industries: Dairies, breweries, refineries, petrochemical plants, pharmaceutical facilities.
Compatibility & Replacements
Compatible With
- Standard pneumatic and hydraulic manifold systems (1/4″ NPT)
- Industrial electrical control panels with 125/250 Vac power
- Snap-acting SPDT relay coils and PLC digital input modules
- ISO 4401 ported valve stacks and cavity mounts
Replaces / Drop-In Replacement For
- Previous Ashcroft LP-Series NEMA 4 models with similar pressure range and port configuration
- Generic industrial pressure switches rated 15–500 psi with 1/4″ FNPT inlet
- Verify current model compatibility with legacy equipment before ordering
Works With
- Programmable Logic Controllers (PLCs) receiving discrete digital input signals
- Direct hardwired relay circuits and safety interlocks
- Pneumatic control valve systems and vent pilots
- SCADA and HMI systems via standard alarm/shutdown contact closure
- ISO 4401 cavity-mounted valve interfaces
