work temperature 20C to 60C high resolution 20m Laser distance meter RS232 interface for liquid level measuring

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Product Overview



Product Description

1. Road traffic
2. Automotive anti-collision
3. Construction survey and design
4. Level\\material level detection
5. Robot arm control
6. Fixed length control of container crane spreader
7. Security monitoring
8. Military applications 








At close range, high frequency and high precision, suitable for indoor use.

Technical Specification

Measurement range


Measurement Accuracy

Standard value:±0.5mm(Static Object),  ±1mm(dynamic object)

Measurement blind area




 Measurement Time

0.1s or 0.3--2s

Output mode

UART ;RS232 ,, Analog output 4-20mA

Laser Type

 Semiconductor wavelength 640nm red visible laser , Class II safety to the eyes

Power consumption

< 1W(Ranging Power)   <0.1W(Standby Power)

Laser Life


Power input

5VDC or 6-24VDC

Temperature Range

storage temperature:-40℃ to +80℃  Working temperature:-20℃--65℃



















Note: if you need RS485 Bus, which can connect 250nos of laser distance sensor at the same time



RS232 RS485 Wiring and instructions


RS232 RS485 Command



Statement for value measured returned




For example



Distance value    

12.3212m display as:44 3A 31 32 2E 33 32 31 32,Unit: m

2.3212m display at:44 3A 20 32 2E 33 32 31 32,Unit: m

BCD code, No ten digits with 20 (space)display


back light

For example 0304

The smaller the value, the better the back light is.,the value <300 represents ranging better,if the vaue>2000, it needs the reflector panel.

In the use of low reflection light, objects measured ,such as coal mines need to strictly monitor the value,

if <50 , the command needs 0x44.


Temperature value

If current temperature is 30.4℃,the result displays :33 30 2E 34  Unit : ℃ 

In the high temperature and low temperature applications, such as iron and steel plant, when the long-term operating or ambient temperature exceeding 60℃ to ensure the long-term stability of the sensor, to make the necessary heat treatment, or turn off the laser, or suspended in a standby state to allow the sensor measurement .


Error information is shown as 44 3A 45 52 XX XX 21 OD OA)or (48 3A 45 52 XX XX 21 OD OA)




Error Code information


Fault reason

Solution ways


Fault reason

Solution ways


Low temperature



High Temperature



Intensity of incident light

Reduce the impact of incident light


Signal is too weak

Use the reflection plate


Signal is too strong

To reduce the reflection of the measured object


Shake too fast

Reduce the vibration of the measured object


Too close

Increase measuring distance


Out of range

Object moving too fast

Reducing the measuring distance reduce the moving speed of the measured object 
















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Under unfavorable conditions, such as in bright sunlight or when measuring to poorly reflecting or very rough surfaces, the module’s measuring range and accuracy will be reduced, please take measurements with reflector(not included).

Do not point the laser dot at persons or animals and do not stare into the laser beam or view directly with optical instruments



Kindly Prompt: If need to DB9 Female head, so RX,TX and G will be corresponding to connection to Second, Third and Fifth base pin of DB9 head separately.




 Frequently Asked Questions (FAQ)



On what kind of targets can be measured?

All opaque targets can be measured. Reliable measurements on transparent targets are not possible.


How is the measurement rate influenced?

The measurement rate is influenced by the target. If the laser light is well reflected by the target, fast measurement rates can be achieved (up to 0.15s in tracking mode).


Does dust influence the measuring process?

If dust overcasts the main part of the laser beam, then your
measurement will be influenced in a negative way. However, this situation can only be found in extreme dusty environment like cement hopper etc.


Is it possible to measure to a moving target?

Yes it is possible. The measured distance is the mean value between the distance at start and end of the measuring process.


What is the Measuring Accuracy?

The measuring accuracy corresponds to the ISO-recommendation ISO/R 1938-1971 with a statistical confidence level of 95% (i.e. ±twice the standard deviation, refer to diagram right. The typical measuring accuracy relates to average conditions 


Is the Laser Light eye safe?

Class II lasers are low power (< 1mW), visible light lasers that could possibly cause damage to a person's eyes. Some examples of Class II laser uses are: classroom demonstrations, laser pointers, aiming devices and range finding equipment. If class II Laser beams are directly viewed for long periods of time (i.e. > 15 minutes) damage to the eyes could result. Avoid looking into a Class II Laser beam or pointing a Class II laser beam into another person's eyes. Avoid viewing Class II laser beams with telescopic devices. Realize that the bright light of a Class II Laser beam into your eyes will cause a normal reaction to look away or close your eyes. This response is expected to protect you from Class II Laser damage to the eyes.



    Contact Information


1.8561 s.