RT-50 PRISM Inline Refractive Index & BRIX Sensor for Cutting Fluid

A Simplified RT-100.

Measures for the concentrations of Sugar Content (%BRIX) and Refractive Index Value (%nD) with one robust, stainless steel sensor with the ability to create User Defined Liquid %. Introducing the PRISM RT-50 Inline Refractometer…

PRISM Parameter nD PRISM Parameter BRIX

CE Mark



The Pyxis RT-50 Prism is an inline digital refractometer that measures the refractive index of a liquid sample and provides a direct reading of highly accurate concentration values for a wide variety of process applications including cutting fluid concentration detection. It is a stand-alone device capable of self-sustained operation, live data display and data logging. The RT-50 Prism also offers fully integrated 4-20mA and RS-485 Modbus output signals for connectivity to any microprocessor-based controller, display, PLC or DCS network. In addition, the RT-50 Prism has built-in temperature dependent equations to convert the measured sample temperature and refractive index to the BRIX concentration. User defined concentration curves and output may also be programmed to the RT-50 through the uPyxis APP interface through user entry of know formula coefficient values. Furthermore, this enables the RT-50 to provide a user-customized display and output of the concentration of the material being measured, as desired.

The RT-50 Prism is a very robust, digital sensor and is capable of operating in contaminated fluid samples. It is important to note that users should take all precautions to filter suspended solids from the sample stream to avoid tenacious deposit build-up on the sensor eye. In highly fouled applications, Pyxis recommends users conduct sensor eye cleaning on a regular basis per the manual guidelines. The RT-50 may also be utilized with the optional accessory Pyxis RT Series Ultrasonic Cleaning Module Kit for automatic sensor eye cleaning while installed in the Tri-Clamp Flow Cell assembly (purchased separately).

Typical Applications

  • Refractive Index Direct Read for Process Applications

  • User Defined or BRIX Concentration Process Applications

  • Ideal for Cutting Fluid Concentration Measurement

  • Specific Gravity Determination via Refractive Index


  • 4–20mA Output of Sample Temperature & the Unit of Display selected via the Screen Interface
  • User Defined Product Concentration Curve Entry via uPyxis APP
  • User Customizable 4-20mA concentration output ranges with uPyxis APP
  • RS-485 Modbus RTU output of temperature, refractive index and other diagnosis parameters
  • Built-in temperature dependent equations % BRIX
  • Local Display and Push-Button Interface
  • Optional 110/220VAC – 24 VDC Wall Outlet Powered for Independent Operation w/out controller
  • Built-In Historical Data Log up to 56 Days of Storage at 1 Reading Per Minute via uPyxis APP
  • Bluetooth Enabled when used with MA-CR Bluetooth Adapter
  • Sturdy 316L stainless-steel construction and suitable for harsh application environments
  • Convenient Stainless-Steel Tri-Clamp Flow Cell Assembly w ¾-inch NPT Flange
  • Easy Installation and Removal for Cleaning and Maintenance – No Tools Needed
  • Automatic Cleaning with RT-Series Ultrasonic Cleaning Module Kit (Purchased Separately)


Item RT-50 PRISM
Part Number 10013
Range of Measurement Refractive Index: 1.3200-1.400
BRIX: 0.00-38.00%
Temperature: -20-80 °C
Resolution Refractive Index: 0.0001
BRIX & Glycol: 0.1%
Accuracy Refractive Index: ±0.0002
BRIX & Glycol: ±0.2%
Sample Temperature 14-131 °F (-10-55 °C)
Max Sample Pressure / Flow ≤142psi (0.98MPa) / <13.5 GPM (9.8ft/s)
Environmental Temperature 14-131 °F (-10-55 °C)
Weight 3.2lbs (1.45kg)
Dimension 4.33×4.2in (110x107mm)
Protection IP67
Light Source LED
Wet Materials Sapphire, 316L Stainless Steel
Signal Outputs (2) 4-20mA & RS-485 Modbus
Power 24VDC (1.5W)
Regulation CE / RoHS

Support Documents

RT-50 Prism Data Sheet

RT-50 User Manual v1.03

RT-Series Utra-Sonic Cleaning Module Data Sheet & Reference Guide


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