ALCO Switch ALCO MPE206R

Core Features Refrigerant-Specific Diaphragm Design: Functions as a precision micro pressure switch engineered to monitor low-pressure refrigerants and gases, featuring a fluorinated rubber (FKM) diaphragm that provides accurate detection across a 0.5–8 bar (7.3–116 psi) range. This material ensures compatibility with common refrigerants (e.g., R134a, R404A, R410A) and resistance to chemical degradation, making it ideal for HVAC&R systems, refrigeration units, and cold-chain equipment. Adjustable Setpoints with Fine Control: Equipped with a calibrated adjustment screw to set actuation pressure within the range, with a differential (deadband) of 0.3–1.0 bar (4.3–14.5 psi) to prevent rapid cycling. A locking nut secures the setpoint, preventing drift from vibration or temperature fluctuations—critical for maintaining stable operation in refrigeration systems where pressure consistency directly impacts cooling efficiency. Broad Refrigerant & Gas Compatibility: The FKM diaphragm and brass wetted parts ensure compatibility with halogenated refrigerants, CO₂, compressed air, and inert gases, making it versatile for commercial refrigeration, heat pumps, and gas handling systems. SPDT Contacts for Flexible Control: Features single-pole double-throw (SPDT) contacts (1 NO + 1 NC) rated for AC 250V (3A resistive) and DC 30V (1A resistive). This configuration supports: Triggering low-pressure alarms (e.g., refrigerant leak detection) via the NO contact. Controlling compressors or expansion valves through the NC contact to maintain optimal pressure. Sending status signals to building management systems (BMS) in HVAC applications. Compact, Temperature-Resilient Housing: Housed in a glass-reinforced thermoplastic housing (UL94 V-0) with a space-efficient footprint (35mm × 25mm × 21mm) and lightweight design (26g), suitable for installation in tight refrigeration units or HVAC equipment enclosures. Enhanced Environmental Protection: Meets IP44 protection (IEC 60529)—dust-resistant and protected against water splashes—making it suitable for humid environments such as walk-in coolers, food storage facilities, or outdoor HVAC units. Simplified Installation: Designed for panel mounting via two M2.5 screws, with a 1/8-inch NPT female port for refrigerant/gas connections. The terminal block uses screw-type connections accepting 0.5–1.5mm² solid/stranded wires, ensuring secure wiring in vibration-prone refrigeration systems. Typical Applications The ALCO Switch MPE206R is engineered for low-pressure refrigerant monitoring in compact cooling systems, with core use cases including: Commercial Refrigeration: Installed in display cases, walk-in freezers, or beverage coolers to monitor evaporator pressure, ensuring consistent cooling and preventing compressor damage from low refrigerant levels. HVAC Systems: Used in heat pumps or split-system air conditioners to detect refrigerant pressure, triggering protective shutdowns during leaks or blockages. Cold-Chain Equipment: Deployed in transport refrigeration units (e.g., for food or pharmaceuticals) to monitor system pressure, ensuring temperature stability during transit. Industrial Chillers: Integrated into small-scale water or process chillers to maintain optimal refrigerant pressure, ensuring efficient heat exchange and temperature control. Gas Handling for Cooling: Used in cryogenic storage auxiliary systems to monitor pressure of inert gases (e.g., nitrogen) used for purging or blanketing refrigeration circuits.