Hygenic Design Process Refractometer


Inline Process Refractometer with Certified Hygienic Design

The EHEDG certified iPR FS comes with a measuring range of up to 85 Brix (refractive index 1.5200). Being EHEDG certified (similar to AAA), it is suitable for almost all applications in food and beverage production.

VariVent connection or APV connection 



  • EHEDG certified
  • Hygienic Design with rounded edges and no slotted screws
  • Easy to use and implement, CIP/SIP possible
  • Competitive price/performance ratio
  • Two analog and two digital interfaces
  • Full, simple, flexible and uncompromising integration into your process
  • Maintenance free, minimal maintenance costs
Hygenic Design Process Refractometer

Easy to Use

The special hygienic design makes the iPR FS the best choice for your application in food and beverage industry. The iPR FS measuring head can be installed in pipes, reactors, vessels and mixing tanks, using different weld-in flanges. Our preferred joint system is VariVent. It allows easy installation through a plug-in clamping method.

Some processes may require cleaning of the sensor face. SCHMIDT + HAENSCH offers an optional cleaning nozzle or a specially designed ultrasonic cleaning device. The iPR FS is equipped with two switch outputs to run, for example, a connected valve (max. 1A, 24 DC) or relay. With this feature is it also possible to control the cleaning of the measuring prism via a magnetic valve.


For determination of mixing ratio, the SCHMIDT + HAENSCH EHEDG certified Hygienic Design Refractometer can be applied in the food and beverage industry, e.g. in production of marmalade, fruit juice, lemonade and more.

Liquid identification and distinction of materials for interfacing purposes is easily made possible with SCHMIDT + HAENSCH’s iPR FS.

IPR FS Prismenansicht

Product in depth

The sophisticated design of the stainless-steel housing of the sensor is equipped with easy to clean surfaces, making CIP/SIP and cleaning in general easily possible. With stainless steel, sapphire and PEEK as materials in contact with the media, it is the perfect fit for food and beverage production.

SCHMIDT + HAENSCH offers customized scales in addition to known standard scales such as Brix, Oechsle, Zeiss, Fat and Honey.




User scalesUp to 4 scales temperature compensated (e.g. RI, Brix, Honey)
Measuring range refractive index1.3200 – 1.5200 RI
Resolution refractive index0.00001 RI
Measuring range Brix0 – 85 Brix (automatic temperature correction 10 °C – 50 °C)
Resolution Brix0.01 Brix
Precision refractive index / Brix+/- 0.00014 RI/ +/- 0.1 Brix
Temperature precision+/- 0.2°C
Temperature resolution+/- 0.01°C
Process temperature0 °C to + 90° C
Ambient temperature-10 °C to + 50 °C
Process contact materialsapphire; stainless steel, PEEK
Max. pressure10 bar (1 MPa)
Power supply24 V DC < 75 mA (20 V – 28 V)
Light source589 nm LED
Analog data output2 x 4 – 20 mA analog outputs
Digital outputTwo digital limit switches (up to 1 A). One serial communication via RS232, RS485 (configurable) or USB
DisplayAs an accessory: can be used next to the iPR or several metres away
SoftwareConfiguration program for: serial output, analog output, monitoring of measured values and saving
Process connectionoptional: VariVent-Inline (Tuchenhagen) or APV-Inline (APV)
Other optionsPrism cleaning unit
Dimension256.6 mm x 136 mm ( length x diameter)
Weight3790 g




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