HK9 Spectrometer

Using the latest microwave technology at the same time both the density and moisture can be measured without contact to the product.

HK9 Vivaldi Antennas  

Moisture and density measurement

  • state of the art microwave engineering
  • modular setup of evaluation unit and sensors
  • no moving parts
  • wear-free
  • maintenance-free
  • vibrations do not have an influence on the result of measurement
  • optional remote control from a PC or separate operating device
  • non-contact measurement
  • 10 measurement/ second

Due to the robust and modular design the microwave measuring instrument HK9 is particularly suitable for the measurements of moisture and density at bulk cargo and bale on a conveyor belt.


The microwave measurement generate an electromagnetic wave of low energy. This signal is coupled via an antenna into the product (Paper, Tobacco, Sand, etc.).

Depending on the dielectric properties of the product the signal propagates in the product. After the signal has passed the product a second antenna receives the signal (Transmission).

Amplitude and phase shift of the received signal are an expression for the water content or dry matter of the product.

The microwave measurement is very stable and it has a quick response to product changes.
Transmissions signal passes through
an in-homogenous product


The calibration of the HK9 is done with our easy to use Specter9 software.

Technical data:

Measuring procedure Microwave engineering ISM- Band
   Size LxWxH
pressure cast aluminum housing
230 x 200 x 110mm
IP65 / NEMA 4
RAL 5024
   Power supply
   2 Analog outputs
   1 Analog input
   Temperature sensor
   2 PC interfaces
   1 Relays contact
   Digital inputs

100-240V AC, optional 24V DC
0/4 - 20 mA
0/4 - 20 mA
PT 100
RS 232 or RS 485
max. 5A/250V
ext. select of 16 products / start / stop
User interface

6 integrated soft keys in keypad
2 x 24 characters illuminated
Antennas Vivaldi antennas
Ambient conditions
   Environment temperature
   Product temperature

-20°C to +85°C
 >0°C to +100°C
Flyer HK9

Harrer & Kassen GmbH
Am Heschen 4-6
D-75328 Langenbrand
Tel:     +49 (0)7084/9248-0
Fax:   +49 (0)7084/9248-29
eMail: info(at)

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