WP311 Series Immersion Type 4-20mA Water Level Transmitter (also called submersible/Throw-in pressure transmitter) use the hydrostatic pressure principle to convert measured liquid pressure to level. WP311B is the split type, who is mainly consisted of a non-wetted junction box, throw-in cable and sensing probe. The probe adopts sensor chip of excellent quality and is perfectly sealed achieving IP68 ingress protection. The immersion part can be made of anti-corrosion material, or be reinforced to resist lightning strike.