Process Refractometer ATEX Rated Explosion Proof


  • Refractive Index Transmitter
  • Ex protection IPR-BR
  • Suitable for all applications in explosion prone areas
  • Certified to ATEX II 1 G Ex ia IIC T4 Ga
  • Inline realtime measurement
  • Concentration of dissolved Solids
  • Chemical Resistant
  • Aseptic Connections

Automatic process refractometer iPR - EX intrinsically safe ATEX rated

explosion proof refractive indexThis is fully automatic process refractometer for direct measurement of dissolved solids, process monitoring and control. It uses the principle of the critical-angle refractometer with a sapphire prism and a high-resolution photodiode array. The measurement is not influenced by the color or opacity of the medium. The measuring head made of stainless steel, it is chemical resistant, food safe and hygienic, for process temperatures up to 120 °C (with water cooling) and at pressures up to 1 MPa.

The explosion protection consists of an intrinsically safe, single-certified sensor, which is installed in the hazardous area. The measuring signals are routed to the non-explosive area via a special cable (maximum length 500 m) and connected to 4 zener barriers. The connection to the central control system is realized with a RTU Modbus or serial RS 485 interface.


Standards ATEX II 1 G Ex ia IIC T4 Ga
Measuring Range 1,32000 – 1,52000 nD
Resolution 0,00001 nD
Precision ±0,00014 nD
Ambient Temperature -20 °C to +65 °C
Process temperature -20°C to +120 °C*
Temperature Resolution/Precision 0.01°C / ±0.2°C (0° to 70°C)
Process pressure 0 to 1 MPa (145 psi, 10 bar)
Prism Material Sapphire
Wetted Parts Sapphire (prism), stainless steel, FKM
Light Source/Wavelength LED 589 nm
Interface ModBus, RS485 and 24V with external Zener barriers
Dimensions 330mm x 149mm (length x diameter)
Weight 9.6 Kg

Ordering Information

Model Description Price
IPR B3EX ATEX rated refractive Index Transmitter Call for quote
or use the Inquiry Form
ACCESSORIES Adapter flanges to suit all kinds of piping and tanks