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Gravity Liquid Sensor Selection Guide
DFRobot's liquid sensors are devices that can measure various properties of liquids, such as water level, pH, ORP, EC and turbidity.
They can be used with Arduino or other microcontrollers for various applications, such as water quality monitoring, hydroponics, aquariums and smart home.
If you want to learn more about DFRobot Water Quality Sensors, please click here.
Product Name
Gravity: Analog pH Sensor/Meter Kit V2 (Arduino & Raspberry Pi & micro:bit Compatible)
Figure
SKU
SEN0161
SEN0161-V2
SEN0169
SEN0169-V2
SEN0249
Measurement Object
pH
pH
pH
pH
pH
Measurement Range
0~14
0~14
0~14
0~14
0~10
Measurement Accuracy
± 0.1pH (25 ℃)
± 0.1pH (25 ℃)
± 0.1pH (25 ℃)
± 0.1pH (25 ℃)
± 0.1pH (25 ℃)
Supply Voltage
5.0V
3.3~5.5V
5.0V
3.3~5.5V
5.0V
Arduino Compatible
√
√
√
√
√
Raspberry Pi Compatible (with external ADC)
×
√
×
√
×
micro:bit Compatible (with micro:mate)
×
√
×
√
×
Probe Level
laboratorial
laboratorial
Industrial
Industrial
laboratorial
Features
First open source pH sensor, easy to use, cost-effective, suitable for conventional needs
Wide voltage input, automatic calibration with standard buffer solution, Compatible with multiple platforms, Two standard buffer solutions included, ready to use
Industrial probe, long-term immersion in liquid for online measurement, stable and durable
Industrial probe, long-term immersion in liquid for online measurement, stable and durable, wide voltage input, automatic calibration with standard buffer solution, compatible with multiple platforms
The probe is attached with a spear like protection shield made of stainless steel with a sharp tip. It can be directly stabbed into the soft semisolid material to measure the pH value, such as wet soil or foods.
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Product Name
Gravity: Analog Electrical Conductivity Sensor /Meter V2 (K=1)
Gravity: Analog Electrical Conductivity Sensor / Meter(K=10)
Gravity: Analog Dissolved Oxygen Sensor / Meter Kit for Arduino
Figure
SKU
SEN0165
SEN0244
DFR0300
DFR0300-H
SEN0237-A
Measurement Object
ORP
TDS
Electrical Conductivity
Electrical Conductivity
Dissolved Oxygen
Measurement Range
-2000mV~2000mV
0~1000ppm
0~20ms/cm
10~100ms/cm
0~20mg/L
Measurement Accuracy
±10mV(25℃)
±10% F.S.(25℃)
±5% F.S.(25℃)
±5% F.S.(25℃)
±10% F.S.(25℃)
Supply Voltage
5.0V
3.3~5.5V
3.0~5.0V
3.0~5.0V
3.3~5.5V
Arduino Compatible
√
√
√
√
√
Raspberry Pi Compatible (with external ADC)
×
√
√
√
√
micro:bit Compatible (with micro:mate)
×
√
√
√
√
Probe Level
laboratorial
laboratorial
laboratorial
laboratorial
laboratorial
Features
First open source ORP sensor, easy to use, cost-effective, suitable for conventional needs
Wide voltage input, Compatible with multiple platforms, Easy-to-use, highly cost effective
Medium range, suitable for conventional needs(e.g. tap water), Wide voltage input, automatic calibration with standard buffer solution, automatic temperature compensation, Compatible with multiple platforms, Two standard buffer solutions included, ready to use
Large range, suitable for special needs(e.g. sea water), Wide voltage input, automatic calibration with standard buffer solution, automatic temperature compensation, Compatible with multiple platforms, Standard buffer solutions included, ready to use
Galvanic probe, no polarization time. Filling solution and membrane cap is replaceable. Wide voltage input
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Product Name
Gravity: Industrial Stainless Steel Submersible Pressure Level Sensor(0~5m)
Gravity: Non-contact Digital Liquid Level Sensor for Arduino
Figure
SKU
SEN0189
SEN0257
KIT0139
SEN0204
Measurement Object
Turbidity
Liquid Pressure
Liquid Pressure
Liquid Level
Measurement Range
0~3000NTU
0~1.6 Mpa
0~5M(depth)
/
Measurement Accuracy
±10% F.S.
±1% F.S.
0.50%
/
Supply Voltage
5.0V
5.0V
12-36V
5~24V
Arduino Compatible
√
√
√
√
Raspberry Pi Compatible (with external ADC)
×
×
×
×
micro:bit Compatible (with micro:mate)
×
×
×
×
Probe Level
laboratorial
Industrial
Industrial
Industrial
Features
Low-cost open source turbidity sensor, plug and play
All-metal shell, available in G1/2 & G1/4 calibers, Long-term online measurement after connecting to the pipeline
The shell of the transmitter is made of stainless steel, anti-corrosion and easy to clean. It can be directly placed in the liquid like water, oil or even mash with large viscosity. Current to Voltage Converter is included.
Non-contact measurement, suitable for the outer wall of non-metallic container without direct contact with liquid. Strong compatibility, penetrate various non-metallic containers.
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