Overview
The Moore 561MFW Nullmatic Controller (part number 14281-158S1) is a pneumatic-based proportional controller manufactured by Moore Products Co., a recognized leader in precision process control instrumentation. This Nullmatic Controller operates on a two-mode proportional band architecture, making it suitable for applications requiring stable setpoint control without electronic actuation. Although this model is now discontinued, it remains in use across industrial HVAC, refrigeration, and process control systems where pneumatic regulation is preferred or required.
Key Features
- Two-mode proportional band operation for stable, responsive control
- Pneumatic construction — no external power required, suitable for hazardous areas
- Proportional band adjustment and reset control capabilities
- Compact form factor for integration into existing control cabinets
- Legacy design proven in marine, industrial, and HVAC installations
Technical Specifications
The following specifications are confirmed for this controller model:
- Type: Two-Mode Proportional Band Nullmatic Controller
- Operation: Pneumatic (no electrical power)
- Application: Pressure and temperature regulation
- Manufacturer: Moore Products Co. (acquired by Siemens)
- Part Number: 14281-158S1 / 561MFW
- Status: Discontinued — available as used/surplus units
Typical Applications
The Moore 561MFW is installed in:
- HVAC pressure regulation and control loops
- Refrigeration system head pressure control
- Pneumatic valve actuation on pressure vessels
- Industrial process control in facilities where electronic controllers are not suitable
- Marine and offshore applications requiring pneumatic reliability
Compatibility & Replacements
Compatible With
- Pneumatic control loops and systems
- Standard industrial pressure regulators
- HVAC and refrigeration plant equipment
- General Regulator (GR) and similar pneumatic valve hardware
Replaces / Drop-In Replacement For
This unit is identified by part number 14281-158S1 and may be compatible with variant 14281-158S3. Verify your specific application requirements with your system integrator before ordering, as pneumatic controller configurations are often application-specific.
Works With
- Pneumatic transmitters and sensors
- Proportional solenoid valves
- Pressure and temperature instrumentation
- Standard air supply at regulated pressure (typically 15–30 psig)
