Soway Technology has a large number of liquid level sensor products, including reed continuous liquid level sensors, magnetostrictive liquid level sensors, LVDT liquid level sensors, capacitive liquid level sensors and ultrasonic liquid level sensors, which can measure continuous changes in liquid level. Realize the real-time, continuous and high-precision measurement of the liquid level, and realize the functions of measurement, control and measurement.
There are also float type liquid level switches and capacitive liquid level switches for detecting high and low liquid level points, which can realize high and low liquid level detection, limit and alarm functions in various liquid level containers.
Widely used in petroleum, chemical, water conservancy, environmental protection, beverage, home appliances, medical and other industries.
| Magnetostrictive Level Sensor |
| Explosion-proof magnetostrictive liquid level sensor |
model |
Power supply |
output signal |
measurement object |
Displacement range(mm) |
linearity error |
Repeat error |
hysteresis
|
resolution(um) |
Temperature Coefficient |
Operating temperature |
| 
|
SFM40S series analog output |
Default 24V DC (optional 12V DC) |
Voltage 0~5V or 0~10V |
Liquid level or interface (up to one liquid level and one interface can be measured at the same time) |
80-3000mm Flexible series3m~23m |
≤±0.05%F.S(minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
Adopt 16bit D/A conversion, 0.0015%F.S |
≤0.007%F.S/℃ |
-40℃～+85℃ |
| electric current0~20mAor 4~20mA |
| SFM40S Series Digital Output |
Modbus |
Liquid level or interface (up to one liquid level and two interfaces can be measured simultaneously) |
5μm |
| SFMS double float type magnetostrictive liquid level sensor |
model |
output signal |
measurement object |
Displacement range(mm) |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
resolution(um) |
| 
|
SFMS series analog output |
Voltage 0~5V or 0~10V |
Liquid level or interface (up to one liquid level and one interface can be measured at the same time) |
80-3000 |
≤±0.05%F.S(minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
-40℃～+85℃ |
Adopt 16bit D/A conversion, 0.0015%F.S |
| electric current0~20mA or 4~20mA |
| SFMS series digital output |
Modbus |
Liquid level or interface (up to one liquid level and two interfaces can be measured simultaneously) |
5μm |
| SFM20T Universal Magnetostrictive Liquid Level Sensor |
model |
Power supply |
measurement object |
Displacement range |
output signal |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
| 
|
SFM20T series analog output |
Default 24V DC (optional 12V DC) |
liquid level or interface |
80～3000mm |
Voltage
0~5V or 0~10V |
≤±0.05%F.S（Minimum±50μm） |
≤±0.002%F.S |
≤0.002%F.S |
-40℃～+85℃ |
| electric current0~20mA or 4~20mA |
| SFM20T series digital output |
Modbus |
| SFM21T Universal Magnetostrictive Liquid Level Sensor |
model |
Power supply |
measurement object |
Displacement range |
output signal |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
| 
|
SFM21T series analog output |
Default 24V DC (optional 12V DC) |
liquid level or interface |
80～3000mm |
Voltage
0~5V or 0~10V |
≤±0.05%F.S(minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
-40℃～+85℃ |
| Current 0～20mA or 4～20mA |
| SFM21T series digital output |
Modbus |
| SFM51F Anti-corrosion Magnetostrictive Level Transmitter (Acid Resistant) |
model |
Power supply |
measurement object |
Displacement range |
output signal |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
pressure |
material |
| 
|
SFM51F series analog output |
Default 24V DC (optional 12V DC) |
The liquid level or interface of lye |
80～3000mm |
Voltage
0~5V或0~10V |
≤±0.05%F.S(minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
-20℃～+85℃ |
≤1MPa |
PFA（strong acid） |
| Current 0～20mA or 4～20mA |
| SFM51F series digital output |
The liquid level or interface of lye |
Modbus |
SFM50P Anti-corrosion Magnetostrictive Liquid Level Transmitter
(alkali resistance) |
model |
Power supply |
measurement object |
Displacement range |
output signal |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
pressure |
material |
|
|
SFM50P series analog output |
Default 24V DC (optional 12V DC) |
The liquid level or interface of lye |
80～3000mm |
Voltage
0~5V or 0~10V |
≤±0.05%F.S (minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
-20℃～+85℃ |
≤1MPa |
PP（strong base） |
| Current 0～20mA or 4～20mA |
| SFM50P series digital output |
Modbus |
| SFMLE Explosion Proof Flexible Magnetostrictive Liquid Level Sensor |
model |
Power supply |
Liquid level range |
output signal |
linearity error |
Repeat error |
hysteresis |
Operating temperature |
Temperature Coefficient |
| 
|
SFMSLE Series Analog Output |
Default 24V DC (optional 12V DC)
|
3000～23000mm |
Voltage 0~5V or 0~10V |
≤±0.05%F.S(minimum ±50μm) |
≤±0.002%F.S |
≤0.002%F.S |
-40℃~+85℃ |
≤0.007%F.S/℃ |
| electric current0~20mA or 4~20mA |
| SFMSLE series digital output |
Modbus |
| SFP423 Series Pressure Type Liquid Level Sensor |
model |
Power supply |
Measurement range |
output signal |
Comprehensive measurement accuracy |
Temperature measurement range |
Temperature Measurement Accuracy |
Temperature Compensation Range |
Operating temperature |
storage temperature |
installation interface |
Enclosure rating |
| 
|
SFP series pressure liquid level sensor |
5～36 VDC |
0～2000mm （Range can be customized） |
0.5~4.5V |
±1%F.S |
-40℃～+85℃ |
±1℃ |
-40℃～+85℃ |
-40℃～+85℃ |
-55℃～+100℃ |
Threaded connection (suitable for oil tank drain screw specification) |
IP65 |
| RS485（F3 protocol） |
| CAN |
| PWM signal output |
| SFP423 Series Pressure Type Liquid Level Sensor |
model |
Power supply |
Displacement range |
output signal |
Accuracy of liquid level measurement |
Temperature measurement range |
Temperature measurement accuracy |
Temperature Compensation Range |
Operating temperature |
Medium of measurement |
Probe material |
enclosure protection class |
| 
|
SFP series pressure level sensor |
5～12VDC |
0～1000mm （Range can be customized） |
RS485（F3協(xié)議） |
±0.5%F.S |
-40℃～+85℃ |
±1℃ |
0℃～+70℃ |
-40℃～+85℃ |
diesel
|
stainless steel |
IP65 |
| Submersible liquid level sensor |
SYP265L series
Input pressure sensor |
Measuring medium |
Power supply |
Measuring range |
output signal |
overload pressure |
Medium temperature |
ambient temperature |
Storage temperature |
Relative humidity |
Rise Time |
Accuracy |
Temperature Compensation Range |
Medium contact material /
Shell material |
| 
|
Water and general non-corrosive liquids |
9 ~ 36V DC (two-wire system), 24±5V DC (three-wire system) |
0~0.01MPa (0~1m water) to 0~1MPa (0~100m water) |
0 ~ 5V DC |
overload pressure |
-30 ~ +85℃ |
-20 ~ +85℃ |
-40 ~ +90℃ |
≤ 95％ (40℃ ) |
≤ 5 milliseconds
Up to 90% FS |
0.5 class, 0.25 class
(comprehensive error including non-linearity, repeatability and hysteresis) |
0 ~ 70℃ |
304 or
316 stainless steel |
| 0 ~ 10V DC |
| 4 ~ 20mA |
| Modbus （RS485 or RS232） |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Plastic vertical installation type |
SF112 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.75A |
-40℃~+80℃ |
31.0 |
Φ24.0×17.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Plastic vertical installation type |
SF112S |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.75A |
-40℃~+80℃ |
31.0 |
Φ19.0×16.5 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Maximum load current(mm) |
| 
Plastic vertical installation type |
SF113 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.75A |
-40℃~+80℃ |
24.5 |
Φ18.0×8.2 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
|
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
| 
Plastic vertical installation type |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.75A |
-40℃~+80℃ |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Rod length (mm)(mm) |
Float(mm) |
|
Plastic vertical installation type |
SF119 |
42.0 |
Φ24.0×17.0 |
| SF11B |
52.0 |
Φ24.0×22.0 |
| SF11D |
85.0 |
Φ24.0×22.0 |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Plastic horizontal installation type |
SF121 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.0A |
-40℃~+80℃ |
64.9 |
Φ17.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
1.75A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Plastic horizontal installation type |
SF122 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.0A |
-40℃~+80℃ |
80 |
Φ17.5 |
| 2 |
70W |
250V |
1000mA |
1000mA |
1.75A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Plastic horizontal installation type |
SF126 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1.0A |
-40℃~+80℃ |
41.5 |
Φ26.0×10.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
1.75A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
Floating ball level gauge, floating ball level gauge, floating ball level switch
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Horizontal Mounting Type |
SF141 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
86.0 |
Φ17.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Horizontal Mounting Type |
SF142 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
73.0 |
Φ17.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Horizontal Mounting Type |
SF131 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
46.0 (customizable by user) |
Φ28.6×28.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Dual Point Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Vertical Mount Type |
SF131 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
187.0 (customizable by user) |
Φ24.0×22.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Vertical Mount Type |
SF132 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
81.0 (customizable by user) |
Φ28.6×28.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Dual Point Level Switch |
model |
Maximum Switching Power |
Maximum Switching Voltage（DC） |
Maximum Switching Voltage（AC） |
Maximum switching current（DC） |
Maximum switching current（AC） |
Maximum load current |
Operating temperature |
pole length(mm) |
Float(mm) |
| 
Stainless Steel Vertical Mount Type |
SF132 |
1 |
10W |
200V |
140V |
500mA |
500mA |
1A |
-40℃~+125℃ |
80.0 (customizable by user) |
Φ28.6×28.0 |
| 2 |
70W |
250V |
1000mA |
1000mA |
2.25A |
| 3 |
5W |
175V |
125V |
400mA |
280mA |
0.5A |
| Anti-corrosion type side mounted float level switch |
model |
| 
|
SF132 |
1 |
| 2 |
| 3 |
Magnetic liquid level switch, magnetic water level switch, magnetic liquid level sensor
| capacitance level transducer |
| Capacitive liquid level sensor SFCZ20 |
output signal |
Measuring range(mm) |
accuracy |
| 
直插式 |
analog output |
100-2000 |
0.25 |
| digital output |
100-2000 |
0.25 |
| SFC520 Series Capacitive Liquid Level Sensor |
output signal |
supply voltage |
Repeat error |
Operating temperature |
Measuring range(mm) |
nonlinear error |
| 
直插式 |
0～5VDC或0～10VDC（Three-wire system） |
5VDC[1] /12VDC[2] /15 ~28V DC |
<±0.02%F.S |
-40℃～+85℃ |
100～1500mm(customizable by user) |
±1%F.S 或 ±2%F.S |
| RS485 RS232 |
| Capacitive liquid level sensor SFC308Z |
supply voltage |
electrical output |
temperature effect |
material |
Measuring range(mm) |
accuracy |
| 
直插式 |
5-9VDC/12-36VDC |
RS485 / 0.5-4.5 VDC |
±0.03% FS/℃ @ 101kPa |
SS316L+PFA |
100-300mm |
±1.5% FS @ 101kPa, water, 25℃ |
| Snap-in capacitive liquid level sensor |
output signal |
Measuring range(mm) |
accuracy |
| 
|
analog output |
100-2000 |
0.25 |
| digital output |
100-2000 |
0.25 |
| Explosion-proof capacitive liquid level sensor |
output signal |
Measuring range(mm) |
accuracy |
| 
|
analog output |
100-2000 |
0.25 |
| digital output |
100-2000 |
0.25 |
| SFC312 series capacitive liquid level sensor |
Displacement range |
Power supply |
output signal |
nonlinear error |
Repeat error |
Operating temperature |
| 
|
100～1500mm（用戶可定制） |
5VDC[1] /12VDC[2] /15 ~28V DC |
0～5VDC or 0～10VDC（Three-wire system） |
±1%F.S 或 ±2%F.S |
<±0.02%F.S |
-40℃～+85℃ |
| RS485 RS232 |
| SFC308 系列電容式液位傳感器 |
Displacement range
|
Power supply |
output signal |
nonlinear error |
Repeat error |
Operating temperature |
| 
|
100～1500mm（用戶可定制） |
5VDC[1] /12VDC[2] /15 ~28V DC |
0～5VDC或0～10VDC（Three-wire system） |
±1%F.S 或 ±2%F.S |
<±0.02%F.S |
-40℃～+85℃ |
| RS485 RS232 |
| Interruptible capacitive liquid level sensor |
output signal |
Measuring range(mm) |
accuracy |
|
|
analog output |
200-300 |
0.25 |
| digital output |
200-300 |
0.25 |
| Static capacitance pipe type liquid level switch liquid level switch |
model |
|
| 
|
PCR25P34-11N |
|
| PCR25P34-26N |
|
