Type YF42NC & YF44NC: Electronic thermostats, rod sensor



-Equipment requesting a very strong resistance to water ingress. The transparent cover allows to visualize the set point and the 2 pilot lights

Temperature control with reduced differential, on-off action, in usual industrial application and environment, not hazardous areas.

These electronic rod thermostats are installed inside pockets as immersion thermostats in pipelines and containers, and for monitoring temperature in air ducts. (Not suitable for hazardous areas).

– Very small differential


Housing: Protection class IP 66 upon EN 60529 (waterproof spray water under high pressure and sea splashes, totally dust tight). Body in black PA66, fiber glass reinforced. The transparent polycarbonate cover can be unscrewed by hand, but it is also possible to use a hook spanner.  Mechanical impact resistance : IK10. High UV resistance.

Set point adjustment:  By °C printed knob. All types have an adjustable rotation limit system located inside the knob that allows reducing the set point adjustment span. °F printed knobs available as an option.

Operation:  Microprocessor electronic thermostat, on-off action

Set point adjustment ranges: 4-40°C (40-105°F); 30-90°C (85-195°F); 30-110°C (85-230°F).

Differential: Differential is preset at the minimum value, but can be increased with a potentiometer located under the set point adjustment knob.

Sensing element: Dia. 5mm NTC sensor (10KOhms @25°C),  inside nickel plated brass pocket.  Thread ½” BSPT. Tube outside diameter 8mm.  Maximum temperature on the probe: 120°C (250°F).   Located at the bottom of the housing, 2 screws are used to secure standard  pockets. (See the compatible brass pockets range in the accessories section).

Pilot lights: One pilot light visualizes the thermostat contact output position. The other visualizes the power supply input. Phase and line 230V power supply is mandatory for these pilot lights.

Cable input and output: Two M20 cable glands, built-in black PA66.

Electrical connections:  Inside, on screw terminal connection block. It is possible to connect 2 wires 1.5mm² on each terminal.

Earthing:  Internal screw terminal.

Mounting: By the pocket thread or by 2 legs with holes for screws dia. 4 to 5 mm, 114 mm distance.

Identification: Identification label on backside.

Contact: SPST. 16A (2.6), 250VAC. Open or close on temperature rise. Model with contact closing on temperature rise is used for refrigeration. Version with contact opening on temperature rise is used for heating.

Electrical life: >100.000 cycles. 

Minimum storage temperature: -35°C (-30°F)

Maximum ambient temperature: 60°C (140°F)

For more technical information ask 2PE2N6 thermostat technical data sheet.



2D&3D Drawing

 Main references

Temperature adjustment ranges

°C (°F)

References with SPNC contact, open on temperature rise References with SPNO contact, close on temperature rise Pocket length

(L, mm)


Temperature sensing length



Differential °C (°F)
4-40°C (40-105°F) YF42NC04040118UJ YF44NC04040118UJ 110 50 0,5~0,8°C (0.9~1.4°F)
4-40°C (40-105°F) YF42NC04040178UJ YF44 NC04040178UJ 170 50 0,5~0,8°C (0.9~1.4°F)
4-40°C (40-105°F) YF42NC04040238UJ YF44 NC04040238UJ 230 50 0,5~0,8°C (0.9~1.4°F)
4-40°C (40-105°F) YF42NC04040308UJ YF44 NC04040308UJ 300 50 0,5~0,8°C (0.9~1.4°F)
4-40°C (40-105°F) YF42NC04040458UJ YF44 NC04040458UJ 450 50 0,5~0,8°C (0.9~1.4°F)
4-40°C (40-105°F) YF42NC04040608UJ YF44 NC04040608UJ 600 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090118UJ YF44 NC30090118UJ 110 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090178UJ YF44 NC30090178UJ 170 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090238UJ YF44 NC30090238UJ 230 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090308UJ YF44 NC30090308UJ 300 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090458UJ YF44 NC30090458UJ 450 50 0,5~0,8°C (0.9~1.4°F)
30-90°C (85-195°F) YF42NC30090608UJ YF44 NC30090608UJ 600 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110118UJ YF44 NC30110118UJ 110 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110178UJ YF44 NC30110178UJ 170 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110238UJ YF44 NC30110238UJ 230 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110308UJ YF44 NC30110308UJ 300 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110458UJ YF44 NC30110458UJ 450 50 0,5~0,8°C (0.9~1.4°F)
30-110°C (85-230°F) YF42NC30110608UJ YF44 NC30110608UJ 600 50 0,5~0,8°C (0.9~1.4°F)

°F printing: replace last character (J) by K