Duplomatic Pressure Switch Replacement | PTH PSP PST Series Pressure Transducer

Genlu Hydraulic proudly introduces our industrial-grade PS / PTH / PSP / PST Series Pressure Switches, engineered for precision monitoring in hydraulic safety circuits, accumulator charging systems, and pump-station overload protection. This series is fully engineered to match global standards, providing a seamless, high-value drop-in replacement for Duplomatic industrial hydraulic control components. We specifically highlight our supply capability for precision-tuned units such as the PTH-250/20E1-K10 (high-pressure piston-style switch), PST2/21N-K1/K, and PST4/21N-K1/K.

As the “watchdogs” of fluid power, these switches utilize high-precision mechanical membranes or piston actuators to detect pressure transients and output instantaneous electrical signals. Genlu guarantees 100% Drop-in Interchangeability across standard mounting threads (G1/4″ etc.), electrical connector pinout definitions (DIN EN 175301-803 standards), and operational stroke parameters compared to original Duplomatic equipment. Every pressure switch undergoes 100% automated pressure cycling, switching response verification, and high-pressure leak-testing on our digital benches, certifying sensitivity, reliability, and zero pressure drift under severe cyclical loads.

Technical Specifications 

• Product Series: PS, PTH, PSP, PST Series (Duplomatic-compatible replacement)

• Core Representative Models: PTH-250/20E1-K10, PST2/21N-K1/K, PST4/21N-K1/K

• Pressure Setting Range: 10 – 400 bar (Application-specific; PTH-250 rated at 250 bar)

• Maximum Proof Pressure: 600 bar (Resilient against over-pressure transients)

• Switching Output Configuration: Mechanical Contact Output (Normally Open NO / Normally Closed NC)

• Electrical Interface: Industry-standard DIN 43650 (K10/K1) rectangular plugs

• Mechanical Cycle Lifespan: $\ge 1$ million switching cycles

• Hysteresis Interval: Approximately 5% – 10% (Adjustable for stable switching thresholds)

• Ingress Protection Rating: IP65 / IP67 (Oil, moisture, and dust resistant)

• Compatible Hydraulic Fluids: Mineral oil, water-glycol, and standard hydraulic/lubricating fluids

Key Technical Advantages:

• High-Precision Micro-Switch Infrastructure: The internal mechanism utilizes a high-reliability micro-switch assembly with minimal travel and anti-oxidation plated contacts, ensuring stable signal transmission even in low-voltage PLC control loops.

• Robust Self-Locking Pressure Adjustment: Features a self-locking anti-vibration mechanism, ensuring that preset thresholds do not drift under machine vibration. Calibrated scales allow for accurate re-calibration in confined spaces.

• Premium Zero-Leakage Sealing Engineering: Uses specialized Fluorocarbon (FKM) seals, maintaining high elasticity across wide thermal ranges and providing “bubble-tight” performance at high pressures.

• Thermal Adaptability & Impulse Noise Filtering: The sensing core filters out high-frequency fluid-borne noise, triggering only when steady-state system pressure reaches the threshold, protecting electrical contacts.

Application Areas:

• Hydraulic Accumulator Energy Monitoring: Monitors accumulator pressure levels to automate charging-valve startup and shutdown.

• Heavy Machinery Safety Interlocks: Primary logic triggers for excavator arm locks, press safety alerts, and fail-safe shutdowns.

• Lubrication & Filtration Diagnostics: Monitors lubrication pump pressure and detects return-line filter clogging alarms.

Expert Maintenance Tips:

• Avoid Excessive Force When Adjusting Pressure Thresholds: The internal spring-loading mechanism is precise. Adjust slowly; if resistance increases, stop. Forcing the screw will deform the spring or rupture the sensing membrane.

• Enforce Correct Gasket Usage during Installation: Using improperly aligned gaskets or incompatible O-rings will result in shearing under high pressure. Ensure the mounting base is clean and secure the unit with a calibrated torque wrench.

• Monitor Connector Integrity & Prevent Corrosion: Inspect DIN connector pins quarterly to ensure they are dry and free of debris. Use electrical contact cleaner to prevent resistance buildup that causes signal intermittency or PLC false alarms.