Description
Reliable & simple probe for sensing aggressive, sticky or heavily contaminated liquids, especially suitable as overflow protection.
Technical Data
Properties NP-250 | NP-252
- Connection head
- PA
- Protection class EN60529 Connection head
- IP 54
- connection thread
- ab G½”
- Container connection flange
- ab DN 25
- Pitot tube material
- PVC
- Material Screw connection
- PVC
- Material flange
- PVC
- Hose Ø
- 16 mm / 25 mm
- Operating temperature
- max. +60 °C
- medium temperatur
- max. +60 °C
- Contact
- Wechsler
- Switching voltage silver
- 250 V AC
- Switching voltage gold
- 24 V AC
- Switching current silver
- 6 A
- Switching current gold
- 100 mA
Properties NP-251 | NP-253
- Connection head
- PS
- Protection class EN60529 Connection head
- IP 54
- connection thread
- ab G½”
- Container connection flange
- ab DN 25
- Pitot tube material
- 1.4571
- Material Screw connection
- 1.4571
- Material flange
- 1.4571
- Hose Ø
- 15 mm / 28 mm
- Operating temperature
- max. +60 °C
- medium temperatur
- max. +90 °C
- Contact
- Wechsler
- Switching voltage silver
- 250 VAC
- Switching voltage gold
- 24 V AC
- Switching current silver
- 6 A
- Switching current gold
- 100 mA
NP-25X configuration
| NP-25 | 1 | - | 2 | - | 3 | - | 4 | - | 5 |
Further product information
The pneumatic-type level switch NP-250/251 has been shown to be a very reliable and simple sensor for scanning liquids, in particular when used for overflow protection. The liquids can be aggressive, sticky or highly contaminated. The switch can also be used for signalling minimum levels. It can be used only in open, pressure less containers, tanks etc. The level switch is supplied in PVC or stainless steel (1.4571) and has a membrane changeover switch of Viton which responds to excess pressure (150 mm water gauge). Operational reliability of the switch when used as a min-max switch and protection against dry-running is guaranteed only if the containers, tanks etc are emptied or partially emptied at regular intervals, so that the air in the pressure tube can be renewed. If double overflow protection is required (redundance) the flange design should be used 2-fold.
Owing to the high switching capacity, contactors, optical and acoustic signalling systems can be directly electrically controlled without an intermediate relay.
