ASCO™ Series P303 Three Pole Pressure Switch

This ASCO switch is designed so to open a three-pole electric circuit when the pressure in the system rises and to close when the pressure decreases. Designed for electric boilers of coffee machines as main application.

• This switch is designed so to open a three-pole electric circuit when the pressure in the system rises and to close it when the pressure decreases.

• Designed for electric boilers of coffee machines as main application.

• In conformity with EU Directive 2011/65/EC (RoHS 2 Directive)

Space & Cost Savings: One device performs the function of three separate pressure switches, significantly reducing installation space, wiring, and procurement costs within control panels.

Enhanced System Reliability & Safety:

· Redundant Monitoring: Two switch points can monitor the same parameter (e.g., high/low alarm) with a third for equipment control, increasing system safety.

· Integrated Complex Logic: The three independent outputs can be programmed to achieve AND/OR logic, eliminating the need for additional intermediate relays and simplifying control logic.

Simplified Installation & Commissioning:

· Only one process connection point is required, minimizing potential leak points.

· External adjustment allows for extremely convenient field setting and fine-tuning without special tools or opening the housing, saving commissioning time.

Superior Environmental Ruggedness: The sealed, robust enclosure makes it suitable for harsh environments like factory floors, outdoors, or areas with oil, moisture, and vibration.

Reduced Maintenance Complexity: Maintaining and calibrating a single device is simpler than managing three separate switches, and spare parts inventory requirements are lower.

Compressed Air Systems

· Applications:

· Air Compressor Control: Switch 1 (Low Start), Switch 2 (High Stop), Switch 3 (Alarm or Standby).

· Dryer & Filter Monitoring: Monitor dew point, pressure drop, trigger regeneration cycles, or clogging alarms.

· Receiver Tank Management: Low-pressure signal to start a backup compressor, high-pressure alarm, safety relief signal.

· Value: Ensures stable air supply, prevents equipment dry-running or over-pressurization, optimizes energy consumption.

Hydraulic Systems

· Applications:

· Hydraulic Power Unit Control: Main pump start/stop pressure, low-pressure alarm (filter clogging), high-pressure safety cutoff.

· Presses & Injection Molding Machines: Monitor multi-stage pressures for different process phases (clamping, injection, holding).

· Value: Precise control of process pressure, protection of expensive main pumps and hydraulic components, prevention of system overload.

Process Industries & Fluid Handling

· Applications:

· Pump Control Systems: Dry-run protection (low pressure), over-pressure protection, signal for VFD control.

· Boiler & Steam Systems: Low-water interlock (via indirect pressure measurement), operating pressure control, high-pressure safety alarm.

· Chemical Processes: Staged pressure control and safety interlocks for reactors.

· Value: Enables multi-tiered safety protection and automated control, ensuring process stability and personnel safety.

OEM Equipment Integration

· Applications:

· Packaging Machinery: Control cylinder working pressure, detect material tension (via cylinder backpressure), fault alarm.

· Machine Tools: Coolant pressure monitoring, fixture clamping force control, lubrication system pressure check.

· Test Benches: Set upper and lower limits for test pressure and provide a control signal to start/end the test.

· Value: Provides equipment manufacturers with a compact, reliable, and feature-rich built-in control unit, enhancing equipment competitiveness.

· Electrical Specifications:

· Switch Type: 3 Independent SPDT (Form C)

· Contact Rating: Typically 15A, 250V AC; or 5A, 250V AC (resistive load)

· Electrical Connection: Screw Terminals (standard)

· Pressure Specifications:

· Set Point Range: Model-dependent, covering various scales

· Deadband (Differential): Adjustable (typically starting around 10% of full scale)

· Maximum Working Pressure: Significantly higher than the upper set point range, high safety factor

· Proof Pressure: Typically 2-4 times full scale

· Environmental Specifications:

· Enclosure Rating: NEMA 4X / IP65

· Ambient Temperature: Typically -20°C to +70°C

· Media Temperature: Depends on sensing element, typically -40°C to +100°C

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