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CNIRHurricane ULM-2.5 Manual

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Type: Manual
Category: Measuring Instruments
Pages: 5
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ULM

-2.5 

Ultrasonic fuel-level meter  

 

Technical parameters  

 

Power supply voltage, V 

9-36 

Max load current of outputs, mA 

10 

Max current consumption, mA 

100  

Working temperature range, 

 C               

– 40 - + 80 

Interface 

Analog 0,3 – 9,6V, frequency 500 -1500Hz, 

EIA 485 (2 pcs) (half duplex), RS232 

Degree of transducer protection 

IP67 

Degree of processing box protection 

IP61 

 

Description  

 
Ultrasonic fuel-level meter is used for fuel level measurement in tanks of auto tankers and any other tanks with a height up to 2,5 meters. The 

measurements are realized by the ultrasonic radiator installed directly on the external bottom part of the tank and data processing box. The ultrasonic fuel-level 
meter can measure levels of diesel, petrol, liquefied gas or other liquid materials depending on software settings.  
 

 

 

Kit 

 

 

 

Pic. 1. 

 

U

LM

-2.5 includes: 

1. 

Data processing box (1 pcs) 

2. 

Ultrasonic radiator with cable (1m) 

3. Extension 

cable 

(6m) 

4. 

Fuse-holder (2 pcs.) 

5. Fuse 

(1

А

) (2 pcs.) 

6. 

Interface cable (1m) 

7. 

3M double side scotch for processing box (1) fixation (1 pcs.) 

8. 

Cable yokes (4pcs.) 

9. 

Screws for processing box (1) fixation (4 pcs.) 

10. Covers 

(4

шт

11. User’s 

manual 

12.  Metal yokes for fixation the cable of the ultrasonic radiator (4 pcs). 
13.  Seal labels (2 pcs) 

 
Accessories (not included): 

1. 

U

LM

 extension cable 5 meters; 

2. 

Installation kit (Acoustic glue, steel tape 4 meters); 

3. U

LM

-programmer 

(reader); 

4. 

Extension cable for the U

LM

-programmer (reader) 

5. 

Cable for 485/232 ports 

 
 
 

Indication, connection and tuning tools  
 

There are 3 LEDs on the top of the processing box (pic.2) 
 

1. 

Red 

– power supply indicator. The LED is on when the power supply is fed to the processing box 1.  

2. 

Green

 – indicator of the fuel level in the tank. The indicator has 2 modes: 

a. 

Measuring mode. The indicator blinks when the fuel level in the tank is below 50mm.   

b. 

Tuning mode. (see chapter Installation, item Installation of the ultrasonic radiator). The indicator blinks with different frequency depending 

on the level of received signal.    

3. 

Yellow 

– indicator of the battery level. The indicator blinks when the level on the built-in battery is below 1.5V. In this case you should change the 

battery.   

 
 

 


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Pic 2. 

 
 

Ultrasonic radiator socket

 – for connection the ultrasonic radiator 2 to the processing box 1 via the extension cable 3.    

 

Port USB 

– for connection to PC (for the service only).  

 

Port 1. EIA485/RS232 

– for connection the processing box 1 to external equipment via digital interface EIA485 or RS232. For example, GSM/ GPS terminals.   

Or 
for making settings and reading data from 

ULM

-2.5 built-in memory via 

ULM

-programmer (reader).  

 

Port 2. EIA485/UART – 

for connection the processing box 1 to U

LM

-programmer (reader) for service purposes only.   

 

Multi-interface socket 

– for connection the

 

processing box 1 to the vehicle power supply net and to external transmitters for online monitoring of the fuel level. 

See the multi-interface socket contacts description in the pic.3. 

 

 

 

 

 
 
 

Pic. 3. Side view of the processing box

 

 

 

1. 

CD Out

 – analog signal output of the fuel-level meter status in “Self-test” mode. See the analog signal description in the Table 1.  

 

Table 1. 

 

Voltage on CD Out, V 

Status 

2.5 Normal 

functioning 

 

2.0 

No signal from the ultrasonic radiator  

0.9 Low 

battery 

0.1 

Low battery + The ultrasonic radiator cable break or no signal from the ultrasonic radiator  

 

2. Digital 

Out

 – «Frequency output». Frequency of pulses of this signal depends on the fuel level in the tank. The frequency range is 500-1500Hz, 

amplitude of the signal is 10V. For better precision of the output data it is necessary to set the maximum of the fuel level. This setting is to be made 
by micro-switches. See the description in the pic.4 and the Table 2.  

 

3. IGN 

– ignition wire

  

4. 

Analog Out – 

«Analog output». Voltage of the signal linearly depends on the fuel level in the tank. The voltage range is 0.3 – 9.6V. For better 

precision of the output data it is necessary to set the maximum of the fuel level. This setting is to be made by micro-switches. See the description in 
the pic.4 and the Table 2.  

 

5. GND 

– 

ground

 

6. +12/24 

ACC 

– 

power.

 

Settings of the micro-switches  
 

The processing box 1 has a group of micro-switches (pic.4) to set different modes of the fuel-level meter .   

 

 

 

 
 

Pic. 4. 

 
 
 

Red 

Green 

Ultrasonic radiator 
socket 

USB port for connection to PC  

Yellow 

Multi-interface socket 

Port 1.  

EIA485/ RS232 

Port 2. 

EIA485 //UART 

Group of micro-switches

 

 


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Table 2. Description of the micro-switches positions  

Switch N 

Position 

Settings 

Pic. 

Test mode – ON  

 

Test mode – OFF (Measurement) 

 


Limit of effective range 1,0m. 

 


Limit of effective range 1,5m. 

 


Limit of effective range 2,5m. 

 


Limit of effective range 2,5m. 

 

Power supply from battery - ON. 

 

Power supply from battery - OFF. 

 

 

 
Installation 

 

Connection to the power vehicle supply net 

 
1. 

Connect the ultrasonic radiator 2 to the processing box 1 by the extension cable 3.  

Make sure that the extension cable 3 should be connected to the processing box 1 by the connector with 3 rubber rings (refer to the pic. 5).  

 

 

 

Pic. 5. 

 

2. 

Put the extension cable into a protective corrugated pipe and lay along the chassis frame or electric wiring run. The cable should be distanced for 

more than 20cm from heated and moving elements of the vehicle.  Fix the cable by the plastic yokes with an interval about 50cm.  

3. 

If necessary the extension cable of the radiator could be enlarged by an accessory – U

LM

 extra extension cable of 5 meter length. But the total length 

should not exceed 16 meters.   

4. 

Connect the processing box 1 to the vehicle power supply net by the cable 6. Pin out of the cable 6 is presented in the pic.6.  

 
 

 

Pic. 6.  

 
 
5. 

Connect the red wire of the power supply +12/24ACC to the corresponding wire of the vehicle electric net through the 1A fuse. 

Connect the black wire of the power supply «-» GND to the corresponding wire of the vehicle electric net through the 1A fuse. 

6. 

Do not connect «Analog Out» wire to your transmitting equipment before the ultrasonic radiator is installed because this wire is used for procedure of 

searching of an optimal place for the ultrasonic radiator installation.  

 

 

Installation of the ultrasonic radiator and the processing box

 

 
1.  Fill the tank fully or at least for 2/3. This will help you to install the ultrasonic radiation with the best precision. 
2.  Place the vehicle on a horizontal surface, the tank should be in a horizontal position.  

If the tank was installed incorrectly and its position differs from the horizontal for more than 2 degrees correct the installation of the tank to make its position 
as close to horizontal as possible.  

3.  Set the limit of the effective range by the micro-switches 2 and 3 (refer to the pic.4 and the Table 2). 

For example, if the height of the tank is 1,8m choose the effective range 2,0m by putting the switch 2 in position 1 and switch 3 in position 2. 

4.  Choose 4-5 places for the ultrasonic radiator installation on the bottom of the tank. These places should be close to the center of the tank bottom and there 

should not be any partitions and other elements inside the tank over the chosen place.  

Make sure that the working surface of the radiator installed in the chosen palaces will be horizontal, as parallel to the fuel surface in the tank as possible 
and therefore the axis of the radiator should be close to vertical. (See pic.7).  

5.  Clean the chosen place from the dirt and grains of sand. 

 

Rubber rings 

 


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Pic 7. 

 

6.  Connect a voltmeter to the wires «Analog Out» and «GND».  
7.  Coat the working surface of the radiator with some water. 

Water should be between the working surface of the radiator and the tank every time you 

press the radiator to the tank.

 

Make sure that there no grains of sand. 

 

If the installation is performed under subzero temperature use a lubricant instead of water. In this case after the place for the installation is chosen the 
lubricant should be completely removed and the place should be defatted. 

Attention! Without an acoustic contact the ultrasonic radiator does not operate. 

8. 

Set the “Test” mode: put the micro switch 1 in position 1 (see the Table 2). Put the power off then on to start the “Test” mode. The green LED will start 
blinking.  

9. 

Press the radiator to the chosen 4-5 places of the tank one by one and check the signals level:  
The green LED will blink with a frequency corresponding to the signal level. As higher the signal level as faster the green LED will blink. If the signal is 
maximum the blinking is almost invisible, the LED will shine constantly. 
or/and 
The voltmeter will register the voltage that varies in the range 0-9,6V and directly proportional to the signal level. 

10. 

Set the “Measurement” mode: put the micro switch 1 in position 2 (see the Table 2). Put the power off then on to start the “Measurement” mode. The 
green LED will be off. 

11. 

Press the radiator to the chosen 4-5 places of the tank one by one again and check the signals level:  
The voltmeter will register the voltage that varies in the range 0-9,6V and directly proportional to the fuel level. The green LED should not light as if it 
lights the fuel level is below 30mm.  

12. 

The best place for the radiator installation is the place where the signal was higher in the “Test” mode and the voltage is not less than 7V in the 
“Measurement” mode.  

 

Example:

  

Test results: 

Place N 

Voltage in «Test» mode, 

Voltage in «Measurement» mode, V  

Comment 

6,1 

7,1 

Good for installation  

2 7,2 

6,9  Good 

for 

installation 

3 9,5 

7,0  Excellence 

for 

installation 

9,6 

0,15 

Not good for installation as low voltage in«Measurement» mode   

9,6 

1,5 

Not good for installation as low voltage in«Measurement» mode   

 
The 1

st

, 2

nd

 and 3

rd

 checked places give 6-9,6V in the “Test” mode and 7V (+/- 0,1V) in the “Measurement” mode. 

The 4

th

 and 5

th

 places give 9,6V in the “Test” mode and 0,15-1,5V in the “Measurement” mode.  

This means that the 4

th

 and 5

th

 places have bad signals. So you have to choose one of the first 3 places which has the highest voltage in the “Test” mode.    

 
13. 

Remove the paint from the chosen place completely till the metal and put a layer of an acoustic glue (not included into the set). The glue should be 
prepared according to its instruction. Air bubbles in the glue are not acceptable.  

14. 

Press the working surface of the radiator to the glue.  
The glue will stiffen in 24 hours. Therefore it is recommended to fix the radiator with a steel tape of 16mm width (not included in the set) laid in the gap of 
the radiator. For tighten the steel tape you can use the machine packing tool 

М

4

К

 (not included in the set). As well you can use the installation magnet 

(not included in the set) which should be taken away after the glue stiffened.  

Remark: Stiffening of the glue could be shortened till 1 hour by heating to 60°

С

 using a heat gun.   

15. 

When the glue is stiffened completely check the voltage in the “Test” mode again. It should be stable 7- 9,6V and  the greed LED should shine constantly. 

16. 

Put the fuel-level meter in the “Measurement” mode (put the micro-switch 1 in position 2 and restart power)  

17. 

If the fuel-level meter will be used in the autonomic mode (U

LM

-0.8 modification) without connection to a terminal GSM/ GPRS transmitter set the micro-

switch 4 in position 1 (see Table 2). Thereby the built-in battery will be switched on. It provides nonvolatile timer for data and time. 

Remark: Current date and time should be set by a dialer or a service center.  

 
If the fuel-level meter will be connected to a GPS/ GPRS transmitter set the micro-switch 4 in position 2 (see Table 2). 

18. 

Put the seal label over the micro-switched.  

19. 

Fix the processing box 1 by the 3M double side scotch or/and 4 screws in the driver’s cabin and connect the wires of the cable 6 according to the pic. 6. 

Remark: If the fuel-level meter will be used in autonomic mode (without connection to a terminal GSM/ GPRS transmitter) the processing box 
should be good accessible for connecting the special uploading cable.  

20. 

Connect the wires «+12/24 ACC» and «GND» to the vehicle power supply net. If the vehicle has a switch of GND the connection should be made after 
the switch). 
Terminal navigation equipment should be connected after the GND switch as well. If it is necessary to connect the devices before the GND switch the 
circuitry of the both devices should have a galvanic isolation (not included in the set).  

 

ATTENTION! DISCONNECT THE MULTI-INTERFAE CABLE FROM THE PORT 1 AND THE ULTRASONIC RADIATOR FROM THE PROCESSING BOX IN 
CASE OF ANY ELECTRICAL OR WELDING REPAIRS OF THE VEHICLE.   

 

Operating in a system with GPS/ GPRS transmitters  

 
Ultrasonic fuel-level meter can operate in a system of collecting and transmitting data such as GPS/ GPRS transmitters. For the connection to the transmitter 
the fuel-level meter has several analog and digital interfaces.  
 
If the GPS/ GPRS terminal has analog-to-digital convertor the following outputs could be used:  

1.  «Digital Out» – «Frequency output signal». ». Frequency of pulses of this signal depends on the fuel level in the tank. The frequency range is 500-

1500Hz; the amplitude of the signal is 10V. 

 

2.

 

 «Analog Out»

 – 

«Analog output signal». Voltage of the signal linearly depends on the fuel level in the tank. The voltage range is 0.3 – 9.6V. 

 

For better precision of the data displayed by the both outputs it is necessary to set the maximum of the fuel level. This setting is made by micro-
switches. See the description in the pic.4 and the Table 2.  

 

 


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Additionally the analog output «CD Out» could be connected to the corresponding input of the transmitter. In this case error diagnostic information (see the 
Table 1) will be sent to the transmitter.  
 
If the GPS/ GPRS terminal has digital inputs the fuel-level meter could be connected via digital interfaces (see pic.2). In this case the data will be transmitted via 
EIA485 or RS232 interface according to a specialized protocol.  
The specification of this protocol could be supplied by a special request.   
 
Connection of the fuel-level meter to the GPS/ GPRS terminal should be made via a special cable (not included in the set). See the pin-out description of the 
special cable in the pic. 8.  
 

 

 

 

Pic. .8  

 
 

 

Operating in autonomic mode  

 
Ultrasonic fuel-level meter can operate in autonomic mode. In this mode the fuel-level meter works as a “black box” saving up data of the fuel level changes 
throughout 30 days.  
The following data is saved in the nonvolatile memory: 

 

1. Current 

date; 

2. Current 

time; 

3.  Fuel level (mm) or volume (liter) (see more information on www.

ChinaUltrasound.com

); 

4.  Temperature mode of the ultrasonic radiator; 
5.  Status of the fuel-level meter ; 
6.  Ignition (if IGN wire connected); 
7.  ID of the fuel-level meter. 

 
The fuel-level meter has a built-in battery for saving the current date and time. Before the installation and usage check the micro-switch 4 which should be set in 
position 1 (see the Table 2).  

 
Attention! If the power is cut-off (disconnected from the vehicle power supply net) and the micro-switch 4 is in position 2 the current date and time 
will be lost. Correct date and time could be set only via a special equipment and software supplied separately.  
 

After 30 days new data will be re-written over the earliest data.  
Saved data could be uploaded via U

LM

-programmer (reader) and special software supplied separately.  

If the yellow LED start blinking the built-in battery is discharged and it should be substituted.