Uniguard Technology Limited

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Ultrasonic Liquid Level Sensor

For oil transporter tank or big tank fuel monitoring, ultrasonic liquid level sensor is needed. Compared to

voltage or pressure level sensor, ultrasonic fuel sensor is more accurate and easy to install. Uniguard

Technology Limited offers complete fuel monitoring and fuel tracking solutions with GPS Tracker Model

UT04.

1. Introduction

The imported non-contact ultrasonic sensor technology is used. Ultrasonic sensor is widely used in

measurement of distance, depth, displacement, liquid level, material level and transparent objects. By

connecting with GPS tracking device, it can be used to monitor fuel consumption details.

2. Product details

2.1 Components

Ultrasonic liquid level sensor is composed of ultrasonic sensor and signal control box.

Picture 1: Ultrasonic sensor detector Picture 2: Signal control box

Power Line

Sensor Extension Line

User Port Line

Signal Control Box

Ultrasonic Sensor

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2.2 Specifications

Working Voltage: 5-36V 50mA

Working Temperature -40℃－80℃

Measurement Range 2cm-99cm(customize MAX 2.5M)

Pressure Range -0.1MPa~32MPa

Level Height Accuracy 3mm

Level Measurement Accuracy Technical 0.1L/Practical 0.8L

Working Environment Moisture-proof(detector),acid-proof(detector),anti-interference,anti-expl

osion(detector), flame retardant(detector), anti-seismic(detector)

Anti-explosion Rate Intrinsic Safety Exia Ⅱ CT6; flameproof Exd Ⅱ CT5

Protection Rate IP66(detector) IP61 (detector)

Device interface This device provides a voltage analogue output port, RS232 data port.

Voltage sampling port Output voltage range: 0.10-6.0V. Computational formula for actual liquid

level and voltage output: 1311.3*Vx+176(unit 0.1mm).

RS232 port the default baud rate 19,200, each 10S interval sensors measured fluid

level in real time (unit 0.1mm), temperature (unit 0.1℃). Baud rate

according to user needs to modify, and transmit data time interval.

Connection Yellow wire: connect RS232 output port of gps tracker; Blue wire: connect

RS232 input port of gps tracker; Green wire: connect analog wire of gps

tracker; Black wire: connect earth

2.3 Features

1. High accuracy. The measurement resolution of oil level is 0.2mm, and it will automatically adjust

temperature from -40℃ and 80℃ to ensure stable performance in both high and low temperature

environment.

2. High stability. Ultrasonic non-contact measurement avoids sensor corrosion, which is a shortcoming

for normal float, pressure type sensor.

3. Easy installation. Ultrasonic sensor is installed below tank, no need to change or drill, and avoid fuel

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leaking.

4. Strong reliability. moisture proof, acid proofing, antiriot, anti-flaming, quake-proof

3. Installation

3.1 Components

1 Signal control box

1 Ultrasonic sensor

1 Power line

1 Sensor signal extension line

1 User interface line

3.2 Extra Tools needed

Glue, ribbon, fine abrasive paper (500, 1000, 2000 size each one), rag, a bucket of water, ultrasound

couplant, multimeter, screwdriver

3.3 Diagram

Ultrasonic Sensor

Tank Bottom Sensor Effective surface

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3.4 Steps

1. Connect ultrasonic sensor, control box and power lines.

2. Vehicle should park at flat road and make sure tank is vertical and parallel to road. Fuel amount in

tank must be at least 90%.

3. Find a flat area at tank bottom center and make sure it is clean and smooth that no paint or sand. For

the steel fuel tank, sensor installation palce paint should be removed by the sand paper ( Ensure the

smooth surface after rubbing by the sand paper). No other thing should come between sensor and

tank surface.

4. Paste ultrasound couplant to ultrasonic sensor effective surface and attach the sensor to the selected

area closely. NO bubbles. Power ON signal control box and measure the GREEN line with multimeter

(DC) to check if there is stable voltage output. Voltage ranges 0.1-6.0V. The higher the fuel level the

larger the voltage. If there is no voltage or abnormal voltage, please start fresh from step 3.

5. Clear ultrasound coupant from sensor effective surface and tank bottom, paste glue on sensor and

press it to tank bottom closely. Make sure no bubbles. If voltage signal is normal then keep pressing

6 to 10 minutes till glue is solidified. If voltage signal is abnormal, remove sensor from bottom quickly

and start again.

6. After glue is solidified, measure GREEN line voltage again and it should range 0.1V to 6.0V.

7. Control box is installed at driver’s cab. For line connection, please refer to above diagram.

8. Please restart device after installation by cutting electricity.

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3.5 Attentions

1. Signal extension line should be properly protected like heat shrink tubing

2. Extension line total must not surpass 15M

3. Power red line is connected to battery positive, black line is connected to car body.