FLEXIM - PIOX R - Process Refractometer for the Chemical Industry - Process Refractometer for the Chemical Industry

Process Refractometer for the Chemical Industry

Inline Process Refractometer - Chemical Design Variant

The concentration analysis of liquid media is one of the most critical parameters for a proper process and quality control within the Chemical Industry.

By measuring the refractive index, concentration levels of many media consumed or created within the chemical and textile fiber industry, such as solvents, acids, caustics as well as other - often corrosive and toxic - intermediate and end products, can accurately be monitored and a total quality control be assured.

Both designs are highly durable against any corrosive and toxic media due to their internal FFKM gaskets, the media and scratch resistant sapphire optics as well as the complete separation of the sensorhead from the electronics compartment.

For measuring toxic and corrosive organic as well as anorganic media, PIOX R is offered as a fully stainless steel design variant with all wetted materials made out of grade 316 Ti / 1.4571 steel.

When dealing with highly corrosive media, such as hydrochloric, strong sulfuric or hydroflouric acid, PIOX R is also available as a special coal powder reinforced PTFE design variant offering an unrivalled corrosion resistance, long term stability and reliability in such harsh environments.

Being ATEX Zone 0/1, 1 and 2 certified and available with long and short sensorheads that can be integrated into the process via DIN / ANSI flange or the proprietary FLEXIM flow cell, PIOX R is the ideal process analytical technology for a wide array of liquid media within the chemical industry.


Process Refractometer for the Chemical Industry - PIOX R - Chemical Design Variant


  • Patented transmitted light measurement principle - offering completely drift free, precise and long term stable measurements
  • Highly accurate optical process technology making costly laboratory tests obsolete
  • No flow velocity needed - as known from conventional technologies
  • Independent in regard to gas bubbles and turbidity as well as the media‘s viscosity
  • Internal self diagnostic tools for predictive and low maintenance efforts

Technical Facts

Measuring quantities
(temperature compensated) Refractive index, media temperature, ° Brix (Plato, Oechsle), w%, additional quantities programmable
Measurement range
nD: 1.3 ...1.7, °Brix: 0 ...100
Measurement accuracy
nD: 0.000 2 (corresponds to: 0.1 °Brix, 0.1 w%)
Operating temp. (media)
- 5 °F ... (+ 270°F) + 300 °F
Fluid pressure
PN 10, PN 16, on request PN 40 (depending on process connection)
Degree of protection
Sensor: NEMA 6 (IP67), ATEX (IECEx) Zone 0/1, 1, 2 Transmitter: PIOX R704: NEMA 4X (IP65), ATEX (IECEx) Zone 2 optional
Explosion protection
PIOX R705: NEMA 4X (IP66), stainless steel enclosure, ATEX (IECEx) Zone 2
Explosion protection
PIOX R709: 19 inch rack version, NEMA 1 (IP20)
Process connection
DIN/ANSI flange compatible, proprietary FLEXIM flow cell
Wetted parts, materials
Chemical Design: Stainless Steel 316Ti (1.4571)
PTFE Chemical Design: Completely PTFE
Housing material
Chemical Design: Stainless Steel 304 (1.4301)
PTFE Chemical Design: Epoxy powder coated Stainless Steel 304 (1.4301)
Additional Notes
Measurement according to the patented Transmitted Light Principle

360° view


For the manual 360° view pull the image left or right


PIOX R - Process Analytics by Inline Refractometry


PIOX R400 -chemistry-

Technical Specification
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