1.According to the function points, can be divided into basic type,with alarm and with transmitter.
2.The basic one can be divided into :conventional type, clip putting, anti-frosting type, indicator fitted above or below type. 

Main technology parameters
1. Basic type
(1) center distance: L=500~600mm choose randomly
(2) error in indication:±10mm        
(3) working pressure:1.6,2.5,4.0,6.3,10.0MPa
(4) medium temperature:-80~300°C
(5) medium density: ≥0.45g/cm3
(6)medium viscosity: ≤ 1St(10-4m2/s)
(7)) meet liquid material: 1Cr18Ni9Ti.304.316.Ti
(8) installation: side
2. Alarm
(1) alarm error: ±5mm
(2) output form: common signal
(3) contact capacity: 24V.DC,0.3A
(4) working life: >105
(5) outlet: M20×1.5(inside thread)
(6) transmission range: 3km
(7) ambient temperature: -40~60°C
(8) hazard classification: flameproof ,dIIBT-4,No. of the citificate: GYB95340
(9) protection classification outside:IP65
(10)weight: 0.5kg
3. Transmitter

(1) measuring range: 0~6000mm
(2) error: ±10mm
(3) output signal: 4~20mA.DC
(4) load impedance: 550Ω(when the power supply is 24V.DC)
(5) power supply voltage: 24V.DC
(6) outlet: M20×1.5(inside thread)
(7) ambient temperature:  -40~60°C
(8) hazard classification: dIIbt1-4,ibIIBT4
(9) protection classification outside:IP65