I. Overview 
  
HNLM-100L ultrasonic level difference meter contains a number of Germany, the introduction of intelligent ultrasound signal processing technology, with a new echo analysis and processing technology, with high safety, cleanliness, precision, long life, stable and reliable, easy installation and maintenance, simple reading other special press, widely used in petroleum, chemical, water treatment, water, steel, coal, electricity and food processing industries for a variety of areas of acid, alkali, salt, anti-corrosion, high temperature, explosion-proof.
    HNLM-100L poor ultrasonic level gauge can be connected to the system through a variety of DCS 4 ~ 20mA or RS485 (Modbus protocol) for the operation of the industrial automation, providing real-time data level.

Second, characteristics

 - Stable and reliable: Our circuit design from the power supply section on the selection of high-quality modules from purchasing key components selection of high reliable device can directly replace imported instruments.
 - Latest technology: Hahn fluid from Germany to introduce advanced intelligent acoustic signal processing technology for intelligent echo analysis, deb ing and without any other special steps, this technique has a dynamic thinking, dynamic analysis capabilities.
 - High precision: Our company has a smart patented sonic technology, the ultrasonic level difference meter accuracy greatly improved, level accuracy of ± 0.3%, is resistant to all kinds of interference waves.
 - Failure rate, easy to install, easy to maintain: This instrument is a non-contact instrument, not in direct contact with the liquid, and therefore a lower failure rate. Instrumentation offers a variety of installation, the user can through this manual instrument calibration.
 - Multiple protection: protection grade meter IP65; all the input and output lines have lightning protection, short circuit protection.

Second, the technical parameters

Measuring range: 0 ~ 15m
Blind zone: 0.25m ~ 0.6m
Accuracy: 0.2%
Ranging Resolution: 1mm
Pressure: atmospheric pressure
Instrument display: LCD display comes with level and level difference; LCD16x2, backlight
Analog outputs: 2 4 ~ 20mA
Digital output: RS485, Modbus protocol or custom protocol
Supply voltage: DC24V / AC220V, built-in lightning protection devices
Ambient temperature: -20 ℃ ~ + 60 ℃
Control: four relays, programmable (level difference)
Protection: IP65

Third, the installation

Meter installation: to be installed in a fixed place instrument L-bracket with screws level gauge to the bracket.

Transducer (probe) Installation:
1, is four or six exceptionally threads probe, iron pipe and PVC pipe or a direct connection.
2 can also be fixed on the plate or flange bracket and the probe is fixed to the flange.

Meter installation guidelines:
1) transducer emitting surface to the lowest level of the distance should be less than the purchase range of the instrument.
2) transducer emitting surface to the highest level of distance, should be greater than the optional instrument blind.
3) transducer emitting surface should be parallel to the liquid surface.
4) transducer mounting position should try to avoid directly below the inlet and discharge port and other liquid positional volatility.
5) If the wall or the tank wall is not smooth, instruments need to leave the tank wall or the wall above 0.5m.
6) If the transducer emitting surface is smaller than the distance between the highest level meter optional blind spot, the need to install an extension tube, extension tube and the required surface perpendicular to the inner wall remains smooth.

Installation Notes:
1) reliable instrument housing is preferably connected with the earth.
2) wire, cable protection tube, to guard against too much water.
3) While the instrument itself with lightning protection devices, but the device is used in multi-mine area, the best instrument into the outlet end of the additional installation of a dedicated lightning protection devices.
4) instrument in particularly hot, cold places, that the ambient temperature may exceed the job requirements of the instrument, preferably around the level meter plus high fortification, low temperature devices.