Overview
The Mercoid AP-153 RG-37 is a Series AP diaphragm-operated pressure control switch engineered for low-pressure instrumentation and pneumatic applications. This compact switch delivers dependable pressure regulation with minimal footprint and cost-effective construction. Ideal for air systems, non-corrosive gases, and compatible liquids, the AP-153 RG-37 provides visible setpoint adjustment and external calibration—essential features for field technicians and system integrators managing distributed control networks.
Key Features
- Diaphragm-operated design for precise, repeatable pressure response
- Visible setpoint indicator with external adjustment knob
- Compact, low-cost enclosure suitable for mounting near sensing points
- SPDT (Single-Pole Double-Throw) mercury switch contact option for reliable electrical switching
- Compatible with air, inert gas, and non-corrosive liquid service media
- Wide pressure range flexibility through RG configuration variants
Technical Specifications
- Electrical Contact Type: Mercury switch, SPDT configuration
- Pressure Range: Low-pressure applications (RG-37 variant specific)
- Adjustment Type: External, visible scale setpoint
- Enclosure Rating: Standard industrial sealed housing (NEMA options available)
- Switch Action: Opens/closes on pressure rise per electrical code
- Service Media: Air, inert gas, non-corrosive liquids compatible with wetted parts
- Mounting: Panel or direct wall mount
- Contact Rating: 4–15A depending on voltage and series variant
Typical Applications
- Instrument air pressure monitoring and cutoff control
- HVAC pneumatic system pressure regulation
- Pump discharge or compressor unload switching
- Low-pressure gas or vacuum alarm detection
- Plant compressed-air management and load shedding
- Industrial process control setpoint triggering
Compatibility & Replacements
Compatible With
- Standard 120/240V AC control circuits
- Industrial pneumatic and compressed air systems
- HVAC mechanical controls and distributed automation
- Plant air networks up to specified pressure ratings
- Non-corrosive process gas and liquid media applications
Replaces / Drop-In Replacement For
- Mercoid AP-153 Series variants (AP-153-36, AP-153-35, AP-153-34, AP-153-33)
- Similar low-cost, diaphragm-operated pressure switches in legacy control panels
- Verify exact pressure range, electrical rating, and configuration code before substitution to ensure system compatibility.
Works With
- Manual pneumatic control systems
- Hardwired industrial relay circuits
- Pump/motor on-off control modules
- HVAC unloader and safety shutdown circuits
- Distributed low-voltage control networks (24VDC common)
