Fully automatic process refractometer for direct measurement of dissolved solids, process monitoring and control. Principle of the critical-angle refractometer with sapphire prism and high-resolution photodiode array; no influence of color and opacity of the medium on the measuring result. Measuring head made of stainless steel, chemical resistant, food safe, hygienic, for process temperatures up to 120 °C (with connected water cooling) and pressures up to 1 MPa.

The explosion protection version of the process refractometer 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.

Alternatively, Schmidt + Haensch offers a control unit, which is also installed outside the hazardous area. The 7 “touch screen is individually configurable. The measured data can be output via Ethernet as a 24 V or 4-20 mA signal or control a relay.

For data transmission to other systems, serial RS 232, 485 interfaces, a CAN bus or UPC server are available.

Up to two measuring heads can be connected at the same time.