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 outputs | 4 |
|---|---|
| Number of control ranges | 1 |
| Output signal | switching |
| External setting | No |
| Rated impulse voltage | 4000 V |
| Electric connection | screw terminals |
| Electronic control | No |
| With explosion protection | No |
| Colour | grey |
| Sensor element | capillary tube |
| Function type (systems engineering) | TW |
| Device version | surface-mounted unit |
| Internal setting | Yes |
| Contact interlocking | No |
| Bearing temperature | –10 … 55 °C |
| Capillary length | 6 m |
| Max. air humidity (non-condensing) | 95 % r.H. |
| Sensor material | Cu |
| Housing material | |
| Max. Sensor temperature | 200 °C |
| Max. switching voltage | 230 VAC, 50 Hz |
| Max. switching current | 15 (8) A |
| Medium | |
| Min. switching voltage | 24 VAC, 50 Hz |
| Min. switching current | 150 mA |
| Mounting/attachment | |
| Surface finish | matt, matt |
| Control range | -10 … 12 °C, -10 … 12 °C |
| Heating control function | Yes |
| Cooling control function | Yes |
| Switching differential | Heating/cooling: 1 K |
| Switching difference, can be adjusted | No |
| Switching element | |
| Switching contact | 2 two-way contacts |
| Potential free switching contact | Yes |
| Switching power | 3450 W |
| Protection class | IP65, IP65 |
| Protection class | I |
| Safety and EMC | in accordance with DIN EN 60730 |
| Scale | Degree Celsius |
| Ambient temperature | −10 … 55 °C |
| Degree of contamination | 2 |
| Dimensions (W x H x D) | 120 mm x 200 mm x 75 mm |
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