Pyxis RT-200 PRISM High-Temperature Inline Refractometer

The Pyxis RT-200 PRISM is a stand-alone inline digital refractometer that measures the refractive index of a liquid sample and converts it to concentration values for samples up to 120 °C. It was designed in particular for sugar production and other high-temperature processes. Built-in temperature-dependent equations give %BRIX, %MEG, %MPG and %ALV directly, and the unit has its own large local display, a data log and Bluetooth 5.0. Mikron Proses (Üsküdar, Istanbul) provides application consulting on choosing the right Pyxis refractometer for your process temperature and fluid.

High-temperature refractive index · Glycol and BRIX → Send us your requirement

For other refractometers in the same family, see the RT-110 series and the RT-50 cutting fluid refractometer.

Measuring range, accuracy and conversion curves

The RT-200 measures a refractive index range of 1.31700-1.5100 with 0.00001 resolution and ±0.00001 accuracy. Its built-in temperature-dependent equations convert the measured sample temperature and refractive index directly to %BRIX (0.00-85.00), mono-ethylene glycol (%MEG), mono-propylene glycol (%MPG) and Advanced Low Viscosity fluid (%ALV) (0.00-100.00 each); resolution and accuracy for BRIX and glycol are 0.001 and ±0.001. Additional concentration curves can be added through the uPyxis app. The sample temperature range is -20 to 120 °C, which makes the unit suitable for high-temperature sugar and glycol processes.

Stand-alone operation: display, data log and power

A defining feature of the RT-200 is its large local display and push-button interface. With an optional wall adapter that converts 110 VAC to 24 VDC, it can run without being connected to a controller. The uPyxis app can read a history log of up to 56 days at 1 reading per minute, and the built-in Bluetooth 5.0 allows wireless diagnostics and calibration (air calibration and liquid concentration offset calibration). The sensor also provides 2 × 4-20 mA analog outputs and an RS-485 Modbus digital output, so it can be integrated into any microprocessor-based controller, PLC or DCS network.

Body, mounting and maintenance

The RT-200 has a 316L stainless steel body and sapphire measuring surface and is designed to work in contaminated liquid samples. It is IP-67, weighs 2.6 kg and measures 140 × 195 mm. Maximum sample pressure is 0.98 MPa, maximum flow is below about 51 L/min and ambient temperature must be -10 to 45 °C. The sensor is installed in a 3/4-inch NPT flanged 316L stainless steel Tri-Clamp flow cell assembly; the standard package contains the sensor, an 8-pin female cable, the Tri-Clamp flow cell assembly (P/N 56206) and a 1.5 m MA-1.5CR connection cable. The manufacturer notes that suspended solids in the sample stream can build up on the optical surface and recommends the optional RT-series ultrasonic cleaning module (P/N 56208), which fits in the Tri-Clamp flow cell, for such applications.

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