HK8-mini NIR-H2O-Meter


Unique NIR- LED technology

  • continuous online moisture measurement
  • no moving parts
  • specially designed for continuous online measuring of moisture/ TS in liquid products in pipes or tanks
  • in large pipes or tanks the sensor is penetrating the product. On small pipes the sensor is flanged on a sight glass
  • Color has no influence on the measured signal
  • no maintenance
  • easy to use calibration software

The HK8-mini is a device for continuous NIR reflection measurement with infrared LED's. The NIR-H2O-Meter is a modular unit, evaluation and sensor system are mounted in different housings. The distance between the sensor and the evaluation unit can be up to 50 meters.

The HK8-mini is a further development of our proven HK8. It was specifically designed to dive into large pipes or to be flanged via a sight glass on a small pipe.
The measured value of the H2O content is available as digital (RS232, optional RS485) and analogue value (0/4-20mA).

In contrast to conventional IR- or NIR-systems of other suppliers, the HK8-mini is not equipped with colour filters or halogen bulbs. The used LED illumination cares for an improved stability with a lifetime of 10 years.

Measurement Design:
The sensor is either completely inserted into the product (flange in large pipes or a tank), or attaches through a sight glass.

Depending on customer requirements, the fitted sight glass or HK8-mini sensor can be equipped with borosilicate glass or sapphire.

HK8-mini with a flange:

HK8 mini mit Flansch
HK8-mini mounted on a sight glass:


The HK8- mini is a complimentery instrument to our microwave moisture measurements (or dry solids) in pipes and tanks where our microwave measurement won't work due to different disturbances (salt, PH value...)

Conceivable applications:

  • Milk industry
  • Paper industry
  • Mozzarella
  • Cream cheese
  • Butter
  • consistency measurement

Technical data:

   Size LxWxH
pressure cast aluminum housing
122 x 120 x 80mm
IP65 / NEMA 4
RAL 5024
   Power supply
   4 analog outputs
   PC interfaces

100-240V AC, optional 24V DC
0/4 - 20 mA
RS 232 or RS 485
RS optional
User interface

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

-20°C to +40°C
 >0°C to +70°C
Flyer HK8

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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