Resistance Fuel Sensor

Capacitor motor oil level sensor combined capacitor sensor and liquid level sensor.The product not only contain the features of high precision measurement and maintenance-free, at the same time it doesn't influenced by temperature and medium.It can be automatically...

Product Details

Resistance Fuel Sensor

Pressure Range:

0-100 mm ~ 3000 (mm) optional  customizable

Probe Diameter:

Φ16 mm (standard) customizable


Standard atmosphere pressure or -1 Bar~5 Bar by customized


≤ ±1.0%F.S;

≤ ±0.5%F.S;


0.01 mm

Blind Zone:

Standard type is 6~15 mm, Min blind is 6 mm by customized.


Standard: 0.01%F.S/5 years,    Max: 0.02%F.S/5years

Working Temp:

-30~85°C standard type,-40°C~125°C, -50 to +250 °C are customized.

Storage Temp:


Medium compatible:

Various media compatible with the 304/316 stainless steel

Capacitor motor oil level sensor combined capacitor sensor and liquid level sensor.The product not only contain the features of high precision measurement and maintenance-free, at the same time it doesn't influenced by temperature and medium.It can be automatically measuring error caused by different temperature or medium for precise compensation,achieving the purpose of accurate measurement.


1.performance index

Examination area: 100~1000mm

resolution ratio: 0.1%

Measuring accuracy:0.1%

Maximal error of measure :1mm

heat-resistant :-40~150

Diameter Φ18mm

Output signal :4~20mA,0~5V, RS485, RS232, CAN bus

Voltage supply :DC7~42V

Rated supply :0.1W

Fixed type :Screw installation M20X1.5 OR Flange mounting

Pressure range :-0.1MPa ~ 0.1 MPa

ambient temperature -40~85℃



 2.1 definition of the output line

Interface output line use 6 core cable, connecting definition:

RS485output mode(CA-201D)

Black line    connect to CND

red line      connect to VDD

white line    connect to RS485 A

blue line     connect to RS485 B

yellow line marking for empty fuel tank

green line marking for full fuel tank

 2.2 Calibration

This sensor adopt high-speed MCU of CNC technology, adopting self-calibration

Calculation , and leaves out the complicated Manual calibration while using. in normal

circumstance, the sensor can directly be used in the measurement of the diesel, if need to calibration, you can use the three following ways to complete. (each can work)

1.self-calibration: put the sensor slowly into the The tested medium while power on, let the liquid get into the feed inlet slowly ,stoping when the liquid is overflew the vent hole of the sensor. and this operation accomplish the calibration of the sensor . In order to prevent the failure of the calibration process , please do this process for at least 2 times .( notice:This way is under the condition of powering on , outage restart will restore the factory Settings.In the condition of empty fuel tank,refueling to full, the sensor itself are also able to complete the self-calibration )

Manual calibration : at the time of empty fuel tank, put the yellow line short circuit with the ground wire( black line) , and then power on the sensor, operating for 60s or longer, after that , disconnect the back ground wire and the yellow line , and this operation could accomplish the calibration ( notice: Sensor already setted to 0 # diesel prior to shipment ,without Special Circumstances)

remote automatic calibration :if adopting RS232 or RS485 for data transmission, it can be accomplished the calibration by vehicle GPS location system sending orders. Sensor has two orders of calibration ,D1,D2. When the fuel tank empty , it will send D1, and when the fuel tank is full, it will send D2, and this operation could accomplish the remote calibration.


1.Only one signal can exist among RS232/ RS485/ 0-5V/ 4~20mA, and you can use either one of them. The trunk of RS485 can meet multiple sensors at the same time, but you should set the address of each sensor in advance. Address of each sensor must be unique, in case the trunk is locked. RS485 trunk is made of half-duplex chips, so when it reading data, you should set aside the corresponding time for the module. The reading speed cannot be too fast: when it reads continuously, the time interval between the two instructions cannot be less than five seconds.

2.For the signal transmission line, especially the one of RS232,communications circuits should not be too long, and should use the shielded wire.


Symptom of  failure  

1No-output /communication error

2The output value unchanged

3Measurement error of output value

4Output value floats up or down

cause analysis

Open circuit of the power or voltage too low

Sensor fault

Wrong connection of the lines and wires

Exclusion and solutions  

1test connect→test if the voltage is greater than 10V when load→test the supply current [range 3~10mA] → connect method see 2.1,or change over blue and white line[digital communication only]→if all above is regular or current beyond normal range,the sensor occurred failure.


1 4~20mA output supply voltage DC20~28V,current is 4~20mA except communication output

2Check the tank oil level is float or not,if become regular after recharge,check the interference and the power

3  it usually can be functional while executing the 2.2.2 process

4  it usually occur on 0~5V signal

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