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JTF-21 W

Frost protection thermostat, capillary length 6 m, internal setting, 2-stage

For protecting hot water heating registers against freezing. The device is intrinsically safe and has a sealable setpoint adjustment.

For temperature measurement of non-aggressive gases. The JTF-21 frost protection monitor has 2 switching outputs, allowing intervention in the system before the danger point is reached. The JZ-05/6M (metal) or JZ-05/6 K (plastic) mounting clamps must be used to clamp the capillary in front of the heating coil. The capillary is active along its entire length. The device responds when approx. 30 cm of capillary reaches the set scale value. Mounting clamps, immersion sleeves and protective coils are not included in the scope of delivery and must be ordered separately. The hysteresis between the stages is approx. 5 K.


Number of outputs4
Number of control ranges1
Output signalswitching
External settingNo
Rated impulse voltage4000 V
Electric connectionscrew terminals
Electronic controlNo
With explosion protectionNo
Colourgrey
Sensor elementcapillary tube
Function type (systems engineering)TW
Device versionsurface-mounted unit
Internal settingYes
Contact interlockingNo
Bearing temperature–10 … 55 °C
Capillary length6 m
Max. air humidity (non-condensing)95 % r.H.
Sensor materialCu
Housing material
Max. Sensor temperature200 °C
Max. switching voltage230 VAC, 50 Hz
Max. switching current15 (8) A
Medium
Min. switching voltage24 VAC, 50 Hz
Min. switching current150 mA
Mounting/attachment
Surface finishmatt, matt
Control range-10 … 12 °C, -10 … 12 °C
Heating control functionYes
Cooling control functionYes
Switching differentialHeating/cooling: 1 K
Switching difference, can be adjustedNo
Switching element
Switching contact2 two-way contacts
Potential free switching contactYes
Switching power3450 W
Protection classIP65, IP65
Protection classI
Safety and EMCin accordance with DIN EN 60730
ScaleDegree Celsius
Ambient temperature−10 … 55 °C
Degree of contamination2
Dimensions (W x H x D)120 mm x 200 mm x 75 mm

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