1. Product Overview
KLD80 series products are frequency modulated continuous wave (FMCW) radar products operating at 76-81GHz, supporting four-wire and two-wire applications. There are multiple models, the maximum range of the product can reach 120m, and the blind area can reach 8cm. Because of its higher operating frequency and shorter wavelength, it is especially suitable for solid-state applications. The working method of transmitting and receiving electromagnetic waves through a lens has unique advantages in high dust and harsh temperature environments (+200°C). The instrument provides flange or threaded fixing, which makes the installation convenient and easy.

The main advantages of KLD80 series FM radar level meter are as follows:

• Based on the self-developed CMOS millimeter-wave radio frequency chip, it realizes a more compact radio frequency structure, a higher signal-to-noise ratio, and a smaller dead zone.
• The 5GHz operating bandwidth enables the product to have higher measurement resolution and measurement accuracy.
• The narrowest 3° antenna beam angle, the interference in the installation environment has less impact on the instrument, and the installation is more convenient.
• Shorter wavelengths and better reflection properties on solid surfaces.
• Support remote debugging and remote upgrade, reduce waiting time and improve work efficiency.
• Support mobile phone Bluetooth debugging, convenient for on-site personnel maintenance work.

Communication and debugging
The instrument can be debugged through LDM in the field, and can also be debugged on the PC side with the optional host computer software. The connection between the meter and the PC is as follows:
to communicate with:
1. USB to RS485 serial cable (four-wire system);
2. USB to TTL serial cable (two-wire system);
3. USB to Hart-modem (two-wire system) for communication.
4. Through the mobile phone Bluetooth debugging, the on-site debugging is safer and more convenient.
5. 4G network, remote debugging through remote module.

2.Product Introduction

Model KLD801 Application liquid, weak corrosive liquid Measuring range 0-10m Process connection thread/flange Antenna size 22mm lens antenna Accuracy ± 2mm Protection grade IP67 Explosion proof grade Exd IIC T6 Gb Frequency 76-81GHz Power supply two wire/four wire/six wire system (DC24V/AC220V) Signal output 4~20mA/HART/RS485 Modbus Display/programming programmer with Bluetooth/5G remote network debugging

3.Technical Specifications

4.Structural dimensions

Schematic Diagram of Pipe Thread Process Connection Structure Size at Room Temperature

5. Installation
Two points for installation:
(1) Align the target material level to ensure that it is perpendicular to the material level plane;
(2) Avoid false echoes. See the following points for typical working conditions.
● Ensure that there are no interfering objects, such as ladders and steps, within the beam range.

Figure 5 – 1 Schematic Diagram of Instrument Installation Position

● The instrument installation shall ensure that the antenna beam avoids the feed inlet, as shown in Figure 5-2.

Figure 5 – 2 Antenna beam avoiding feed inlet

● The instrument shall be installed at least 20cm away from the vessel wall, otherwise it is likely to produce wrong readings, as shown in Figure 5-3.
Remarks: The liquid measurement installation spool should be perpendicular to the ground.

Figure 5 – 3 Installation at least 20cm away from the vessel wall

● The solid cone container shall ensure that the beam is directed at the tank bottom as much as possible, otherwise the measurement results at the tank bottom may be inaccurate, as shown in Figure 5-4.

Figure 5 – 4 The conical tank shall ensure that the beam is directed at the tank bottom as far as possible.

6. Product wiring diagram
6.1 Wiring diagram of single chamber enclosure 24VDC power supply four wire products

Fig. 6-1 Wiring Diagram of Four wire Products
In four wire system application, 4-20mA analog output is two separate terminals except 24V power supply terminal. At the same time, the four wire system also provides 485 output terminals, which is convenient for connection and debugging with PC or the site requiring 485 interface.

6.2 Wiring diagram of single chamber enclosure 24VDC power supply two-wire product

Fig.6-1 Wiring diagram of two-wire products

In the two-wire system application, in addition to the traditional power supply terminal (4-20mA output), the instrument also has a serial communication terminal, which is convenient to connect with the current mainstream IOT equipment or transparent transmission equipment for remote control and debugging.

Model Selection Table
80GHz FM radar level meter

Xi'an Kacise Optronics Co.,Ltd. is a professional manufacturer of  measuring instruments , located in China xi’an City. Since 2008, Xi'an Kacise focused on the development and production of pressure, level and flow measuring instruments .

We have been specializing in manufacturing pressure, level and flow measuring instruments and related products for 10 years. Based on experienced technical and management personnel, through efforts of our entire staff, we have become a professional measuring instrument manufacturer and solution provider. And we are continuously trying to improve product quality.

Xi'an Kacise is qualified with ISO 9001-2008, GJB 9001B-2009, CE, intrinsic safety explosion-proof and isolated safety explosion-proof certificates, etc. which ensure that our products comply with international standards.

Kacise sensors have already been exported to America, Spain, Australia, Chile and 20 other countries and regions, and received many favorable feedbacks. Our overseas distributers are also increasing. We regard “reasonable prices, efficient production time and good after-sales service” as our tenet, and hope to cooperate with more customers for mutual development.

Our goal is simple: to sell the best products at the best prices, and provides industry-leading customer service. We personally get to know each of our customers, and we know how to discover the most valuable part of our business , to help others achieve their goals.