Capacitance level sensor installation and recalibration after cut
Introduction
This article is intended to introduce capacitive-level sensor installation, commissioning, and calibration procedures.
Please read this manual carefully, complete the installation according to the instructions correctly, especially comply with the relevant national compulsory safety standards.
When do not implement the above requirements and cause any equipment damage or personal injury, the manufacturer will not be responsible for these.
Wiring way and port description
2.1 Interface and Wiring
Analog signal-Voltage / Current output : +VCC, GND, VOUT / IOUT
Digital signal-RS485 communication: +VCC, GND, A, B 2.2 Wiring Port Description
| Series No.: | Item | Definition | Thread Color |
| 1 | +VCC | Power supply Typical value | Red |
| 2 | GND | Power Ground | Black |
| 3 | A | RS485 TR+ | Blue/Yellow |
| 4 | B | RS485 TR- | White |
| 5 | VOUT | Analog voltage output | Blue |
| 6 | IOUT | analog current output | Blue |
Definition:
1. Output is only one-way output, so it has the same cable color.
2. This wiring is standard cable colors, please reference the actual description if difference.
*If the current output does not reach the full scale, it requires external loop load resistance.
2.3 Wiring diagram
Voltage output wiring diagram: Diagram for three wires current output wiring:
3. Sensor Installation Steps
3.1 Basic tools are as follows:
3.2:Drilling
3.2.1 First, clean the tank residual oil, then rinse with water many times to make it look best
3.2.2 To select the drilling point on the center of the oil tank surface, and please consider whether it conflicts with the tank inside the unit.
3.2.3 Use a hole saw to drill point on a selected fixed point, when drilling, please avoid the iron filing falling into the tank.
3.2.4 When completed, according to sensor gasket holes, select a smaller drill to process fixing holes
3.3 Sensor truncation
3.3.1 First, measure the inside height of the tank, get the value H
3.3.2 The inside height of the tank H – 10mm = L (L is the sensor height from the flange lower end portion to the bottom)
3.3.3 After getting value L, then use a hacksaw to saw off the excess part of the sensor
3.3.4 After sawing off, using a grater to clean the surface fines, maintaining the surface smooth and clean, more, cleaning
out the inside and outside aluminum scrap.
3.3.5 Re-fixed the bottom terminal with screws, now the sawing off is over
3.4 Calibration
Note: 1. When the sensor is truncated, you must re-calibration
2. The calibration process is only related to immersion liquid height, and immersion medium, and has nothing to do with the fuel tank capacity
3.4.1.Analog output calibration method
3.4.1.1 Before sensor calibration, please confirm the sensor is properly connected to the handheld calibrator (The attachment is
handheld calibrator specification),then turn on the calibration power switch, meanwhile prepare the number of necessary measuring mediums (The container depth should be bigger than the sensor range )
3.4.1.2 Fixing the sensor, the height of the immersed bottom fixed to the zero level of liquid that the customer requested.Stand for
10 seconds, press the button on the zero point calibration, when the lights flash, which indicates successful zero calibration. Then the output is 0V or 4mA.(That is zero-bit output)
3.4.1.3 Similar to step 2, compare the height of the sensor immersed to the full-scale liquid height set by the customer, and let stand for 10 seconds, press the full-scale calibration button, when the light flashes, it represents the full-scale calibration success, then the output 5V or 10V, 20mA(This is full-scale output)
3.3.4 When both zero and span calibration succeeds, you can move the sensor in the level upper and lower by hand-held then you can see the display instrument changes with the level changes accordingly.
3.4.1.4 When both zero and span calibration succeeds, you can move the sensor in the level upper and lower by hand-held then you can see the display instrument changes with the level changes.
Exception Specification:
When the sensor continuously output 2.5V or 5V, 12mA, it means abnormal sensor calibration, then must be calibrated
after power restart
3.4.2 Digital output calibration method
3.4.2.1 Please make sure the sensor has connected the power before calibration, and the digital output lines are connected to the computer through the adapter, and turn on the test software(see the relevant documentation for software operation)
3.4.2.2 Please make the bottom of the normal connected sensor immersed to the desired zero point, let stand for 10 seconds, and make the operating software record zero value;
3.4.2.3 Similar to step 2, make the sensor immersed to the full scale,let stand for 10 seconds, and make the operating software record zero value;
3.4.2.4 According to the procedure of software calibration success, Open the display interface, you can see the display interface data changes with the height of the sensor immersed;
Exception specification:
When the software displays the calibration is unsuccessful, you must be calibrated after power restart.
3.5 Installation and mounting
3.5.1 When the calibration process ends normally, you can install the sensor in the fuel tank
3.5.2 Now you can mount the sensor on the fuel tank by self-tapping screws, then the installation process is finished
Attached a list of tools required for installation and calibration
- Make the handheld calibrator connector connect with the sensor output connectors, slide the switch on the right side, and place ON, the POWER light;
2. Adjust the liquid level to the zero position, then press the EMPTY button for nearly 2 seconds until the SET level shines one time, meaning zero calibration success;
3. Same as above, adjust the liquid level to the full position, then press the FULL button for nearly 2 seconds until the SET light shines one time, meaning full calibration success;
4. After that, release the Calibration device connector, then follow the wiring method;
Note: the calibration process must be completed together, in the process can not power outage; If the calibration output is abnormal, please follow the steps to calibration.