Hengesbach NG Turbidity Sensor TURBIMESS

Hengesbach NG Turbidity Sensor TURBIMESS is an optical sensor measuring the reflected radiation arising from particles or fat droplets in liquid media. The operating and display elements are housed inside the device head. In addition to a 4-figure, 7-segment display, the device head features two LEDs and three push buttons.

The device features two switching points. The operating status of each switching point is indicated by an LED. If a switching point is activated, the supply voltage can be measured at the corresponding connection of the M12 plug connector (PNP action). At the same time, the corresponding LED also lights up. If the switching point is not activated, the LED does not light up and there is, therefore, no voltage to be measured at the corresponding switching point’s output.

Hengesbach NG Turbidity Sensor Features:

  • Turbidity sensor with 2-wire 4….20 mA output
  • Process connections Clamp; Varivent; DIN 11851
  • 2 individual programmable switch-points with status LEDs
  • Integrated LED display
  • Easy parametrizing with three push buttons
  • Compact hygienic design made in stainless steel
  • 2 operating modes:
    – NTU mode (linear) for turbidities between 0 and 4.000 NTU
    – 9 select able support points for fat contents up to 30%
  • Temperature resistant long-term: 125°C /short-term 150°C


  • detection of product change
    (e.g. milk – cream – whey)
  • continuous monitoring of e.g. milk fat content / quality inspection
  • monitoring of the cleaning agents’ pollution degree during CIP
  • detection of filter breakdown
  • detection of yeast and cloudy fruit juice

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General details
Device type TURBIMESS NG
Measuring principle Backscatter from transmitted emitted infra-red light beam
Measuring ranges Factory setting: Linearised turbidity > 50 to 4000 NTU*
9 freely configurable reference points
*Configuration using NTU Standard, measurement procedure approximated
Maximum process pressure PN16
Output signal 4…20mA, 2-wire
Signal range 3.8…20.5mA as per Namur NE043
Fault signal 22mA
Switched output 2x PNP, each of max. 50mA
Factory setting: Not activated
Measuring accuracy
Accuracy ± ≤ 0.2% from measuring range end value
Reproducibility ± ≤ 0.1% from measuring range end value
Thermal influence ± ≤ 0.2% / K from measuring range end value
Setting time after input leap ≤ 3s
Activation time < 2s (The device will carry out a self-test.)
Conditions of use
Installation position / calibration position Optimal installation position is in risers (ascending pipes) or, if not possible, to the side of other pipes (to
avoid product residues and incorrect measurements due to gas bubbles); device must not be installed in downpipes (descending pipes).
Medium temperature 0…125°C / up to 150°C for brief periods (max. 30 mins)
Ambient/storage temperature -10…85°C
Protection class acc. to EN60529 IP 67
Electromagnetic compatibility acc. to DIN EN 61000 and DIN EN 61326-1
Electrical connection Round plug-in connector M12x1, 5-pin, nickel-plated brass (stainless steel available on request)
Process connection  Clamp connection acc. to DIN 32676, DN50/2″
Materials Varivent flange Type F (d50) and Type N (d68)
 Conical couplings with groove union nuts acc. to DIN 11851, DN50 and DN65 ˃˃ Scope of delivery not incl. seals and, where applicable, clamps
– Field housing / lid: Stainless steel 1.4301 (AISI 304)
– Inspection gauge in lid: Polycarbonate (PC)
– Housing seal: FPM (Viton®)
– Process connection / connection adapter: Stainless steel 1.4404 (AISI 316L)
– Medium-contacting density gauge: Sapphire glass
– Seal on gauge: Silicone rubber, approved by FDA
Weight approx. 1.5kg
Display and operation
Display 4-figure, 7-segment display, incl. decimal point, 2x status LED for switching points
Operation 3 input keys
Auxiliary energy resources
Power supply / burden 24…30V DC, max. burden: 600 Ω
Certificates EG Declaration of Conformity
Conformity acc. to Regulation (EC) 1935/2004
Acceptance test certificate 2.2 in acc. with EN 10204 for parts which come into contact products

Download Data Sheet: Turbidity Sensor TURBIMESS NG

Ref: hengesbach.com

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