Temperature Sensor Replacement for MS4/A421


Replacement temp sensor for the MS4 and A421 controllers.

PTC Silicon Sensor with PVC Cable;
Cable length 6-1/2 ft (2 m);
Range: -40 to 212°F (-40 to 100°C)


The A99B Series Temperature Sensors are passive PTC (Positive Temperature Coefficient) sensors.
The A99B sensors are splashproof and are designed to measure temperature in a variety of
refrigeration applications. Several accessories allow easy tailoring of the temperature
sensor to various mounting configurations. Applications include temperature sensing for
freezers and coolers, as well as in defrost termination sensing, space and return air
temperature sensing, and condenser fan cycling. Refer to the A99B Series
Temperature Sensors Product Bulletin (LIT-125186) for important product
application information.

• variety of lead lengths available to encompass most application requirements
and simplify wiring sensors
• an assortment of mounting hardware provides configurations for many applications
• exceptional accuracy of sensing element provides excellent performance
in a wide variety of control applications
• stainless steel sensing bulb allows use in more applications than other
types of bulbs without corrosion
• lead length may be extended up to 800 ft (244 m)

Additional information

Weight 1 lbs
Dimensions 4 × 4 × 6 in
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