MSR MA-4 Freon and Refrigerant Gas Transmitter

MSR MA-4 Freon and Refrigerant Gas Transmitter

The MSR µ-Gard MA-4 is a fixed analogue transmitter for continuous monitoring of specified Freon and refrigerant gases in ambient air.

  • Refrigerant-specific leak-detection configuration
  • Suitable for chiller rooms, refrigeration plants and mechanical rooms
  • 4–20 mA or 0–10 V analogue output, depending on configuration
  • Compatible with suitable MSR gas controllers and automation inputs
  • Factory calibration for the selected refrigerant and measuring range
  • Detector location selected according to refrigerant density and leak source
  • Ask Seacom to confirm the correct refrigerant sensor

Fixed Refrigerant Leak Detection

The MSR µ-Gard MA-4 continuously monitors ambient air for a specified refrigerant gas. It converts the sensor measurement into an analogue signal for a compatible gas controller, PLC or building-management system, allowing the wider system to generate alarms, start ventilation or initiate a defined safety response.

“Freon” is commonly used as a general term, but refrigerants have different chemical compositions and sensor responses. The correct transmitter must therefore be selected using the exact refrigerant designation, required measuring range, room conditions and alarm strategy.

Model-status check: MA-4 belongs to an earlier MSR product generation and is not shown among MSR’s current product series. Confirm product availability, replacement-sensor support and the suitable present-day MSR refrigerant detector before specifying it for a new installation.

Confirmed MA-4 Functions

FunctionMA-4 provisionSelection consideration
Measurement duty Continuous monitoring of ambient air for gases and vapours Specify the exact refrigerant rather than “Freon” alone
Typical locations Chiller rooms, refrigeration plants, mechanical rooms and commercial facilities Review equipment layout, ventilation and likely leak sources
Current output 4–20 mA analogue signal Match supply, loop arrangement, scaling and controller input
Voltage output 0–10 V analogue signal on the applicable configuration Confirm input impedance, common reference and cable distance
Controller integration Connection to a suitable MSR controller or compatible automation system Confirm alarm logic, fault handling and output compatibility
Calibration Factory calibration for the ordered refrigerant and range Record the calibration gas, range and product code

Select the Correct Refrigerant Detector

Selection itemInformation requiredWhy it matters
Refrigerant Exact designation from the chiller or refrigeration equipment nameplate Sensor response and calibration differ between refrigerants
Concentration range Required ppm range and alarm thresholds Determines transmitter scaling and controller programming
Application Leak warning, occupational exposure monitoring or emergency alarm Determines alarm philosophy, redundancy and response actions
Room layout Dimensions, equipment position, pits, trenches, ventilation and airflow Determines detector quantity and mounting location
Environment Temperature, humidity, condensation, cleaning chemicals and dust Affects sensor selection, service life and enclosure suitability
System interface MSR controller, PLC, BMS or standalone alarm requirement Determines output, wiring, relays and communication architecture
Site classification General area or classified hazardous area Determines the required detector construction and certification

Refrigerant Information to Check

  • Read the complete refrigerant designation directly from the equipment nameplate or service record.
  • Do not assume that a detector calibrated for one refrigerant will provide the same response to another.
  • Identify refrigerant mixtures and blends accurately, including the suffix where applicable.
  • Confirm whether the plant may be converted to a different refrigerant during its service life.
  • Review cross-sensitivity to cleaning agents, solvents, fuels and other gases present in the room.
  • Define the required alarm thresholds using the site risk assessment and applicable requirements.

Output and Alarm-System Integration

ConnectionTypical useCheck before ordering
4–20 mA Gas controller, PLC or remote analogue-input module Supply arrangement, scaling, cable, fault current and input isolation
0–10 V Compatible HVAC or building-management input Common reference, input impedance, wiring distance and noise
Gas controller Central display, alarm relays, sounders, beacons and ventilation commands Channel capacity, alarm levels, relay logic, backup power and event handling
PLC or BMS Plant-wide indication and control integration Gas-safety functions, fault supervision and independent alarm requirements

MSR Refrigerant Gas-Detection Support

Seacom Process Instruments supplies and supports MSR fixed gas-detection solutions for chiller rooms, refrigeration plants, cold-storage facilities, mechanical rooms and other commercial or industrial applications.

Our team can assist with refrigerant selection, measuring range, detector quantity and location, controller architecture, analogue integration, alarm outputs, commissioning and maintenance planning. Support is available for projects in Malaysia and selected international markets.

Explore MSR gas-detection products   View the MSR gas alarm system

Need help selecting a refrigerant detector? Send Seacom the exact refrigerant, equipment schedule, room layout, ventilation arrangement, alarm thresholds and controller requirements. We will help check the suitable sensor and system configuration.

Download

  MSR Catalogue   (6.97M)


Specific References

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