Pyxis RT-50 PRISM Inline Refractometer (Cutting Fluid)

The Pyxis RT-50 PRISM is a stand-alone inline digital refractometer that measures the refractive index of a liquid sample and converts it to a concentration value; it is intended in particular for cutting fluid (metalworking coolant and lubricant) concentration. The manufacturer describes it as a simplified RT-100. It measures a refractive index of 1.3200-1.400 and converts it to 0.00-38.00 %BRIX (by mass), and the concentration curve can be user-defined. Mikron Proses (Üsküdar, Istanbul) provides application consulting on choosing the right Pyxis refractometer for your fluid.

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For other refractometers in the same family, see the RT-110 series and the RT-200 high-temperature refractometer.

Measuring range and user-defined curve

The RT-50 works over a refractive index of 1.3200-1.400 with 0.0001 resolution and ±0.0002 accuracy. Using built-in temperature-dependent equations, it converts this value to %BRIX concentration (0.00-38.00%, by mass); BRIX resolution is 0.1 and accuracy is ±0.2. The RT-50 lets the user enter their own known formula coefficients through the uPyxis app to create a user-defined concentration curve and output, so the concentration of the measured material is not limited to a fixed BRIX curve. Sample temperature must be between -10 and 70 °C.

Stand-alone operation: display, data log and power

With its local display and push-button interface, the RT-50 provides a 4-20 mA output of temperature and the selected concentration unit. With a 110/220 VAC to 24 VDC wall adapter, which the standard package includes, it can run independently of a controller. The uPyxis app can read a history log of up to 56 days at 1 reading per minute, and an optional MA-CR Bluetooth adapter allows wireless diagnostics and calibration. The sensor provides 2 × 4-20 mA analog outputs and an RS-485 Modbus digital output at the same time, so it can be integrated into any microprocessor-based controller, PLC or DCS network.

Body, mounting and maintenance

The RT-50 has a 316L stainless steel body and sapphire measuring surface and is designed to work in contaminated liquid samples. It is IP-67, weighs 1.45 kg and measures 110 × 107 mm. Maximum sample pressure is 0.98 MPa, maximum flow is below about 51 L/min and ambient temperature must be -10 to 40 °C. The sensor is installed in a 3/4-inch NPT flanged 316L stainless steel Tri-Clamp flow cell assembly and can be removed and cleaned without tools. For applications with a high fouling risk, the manufacturer recommends regular cleaning of the sensor surface and the optional RT-series ultrasonic cleaning module, which is sold separately.

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