MPR E-SCAN Critical Angle Refractometer

   INTRODUCTION    The MPR E-Scan is a microprocessor-driven critical angle refractometer that is used to measure the refractive index of process fluids and may be used as an error indicator or an integral part of a complete process control system.   The MPR E-Scan is equipped with a broad range of diagnostics to aid in fault isolation without the use of special test equipment. The refractometer is calibrated and temperature compensated to your process specifications. It is ready for installation and immediate use when received. Calibration procedures are available to change system parameters and allow the refractometer to measure different process fluids.   EMC has combined accurate electronic scanning techniques with fast microprocessor circuit technology, blended with powerful and user friendly software. The MPR E-Scan is the refractometer for the 21st Century.  HOW IT WORKS

Energy radiated from an LED in the sensing head passes through the prism surface to be reflected off a mirror to the prism-to-process interface. The light reaching this interface intersects the same interface over a series of angles chosen to include the critical angle (Ic) for the process being measured. Light intersecting the interface at an angle greater than the critical angle is refracted into the solution. Light intersecting the interface at less than the critical angle is reflected up to a mirror and out of the prism up to the CCD linear array to be scanned.

The MPR E-Scan utilizes state-of-the art CCD (charge coupled device) technology wherein the image is composed of simple light and dark periods that are electronically scanned. As the refractive index of the process changes, the change in critical angle changes the ratio of light to dark periods as seen by the CCD. This time period change is then further enhanced and displayed as a reading in refractive index, Brix, solids, or another measurement unit. This scanning time measurement technique, i.e. many times per second, provides high sensitivity combined with immunity to entrained air and pulpy streams. Further, the MPR E-Scan utilizes an LED light source which requires minimum power, generates less heat, and has maximum life expectancy.    CONSOLE   The console is constructed of molded fiberglass polyester for maximum protection in harsh environments. It is rated NEMA-4X. The front panel consists of a 320 x 240 LCD screen which provides the operator with various messages, and a 20-button touch pad which allows the operator to make entries and initiate commands.
  STANDARD FEATURES  

	320 x 240 LCD display
	386-SX microprocessor running at 25 MHz
	Operator friendly software
	Calibration in user defined units
	20 multi-range capability
	User friendly diagnostics
	CCD light sensor in head eliminates mechanical scanning
	Outputs to drive cleaning solenoids and alarms
	4-20 MA and RS-232 outputs

OPTIONAL FEATURES

	Measurement PID Control
	Temperature PID Control
	Multi-range calibration as requested (Up to 99 available)
	Stainless steel NEMA 4X head connector

OPTIONAL OUTPUTS

	Printed output
	Remote Display
	Computer Interface
	Isolated 4-20 MA Output for Measurement and Temperature
	4-20 MA output for PID control (Isolated or Non-Isolated)

  PULP & PAPER APPLICATIONS   

  FOOD INDUSTRY APPLICATIONS   

CHEMICAL INDUSTRY APPLICATIONS   

SPECIFICATIONS  

TeflonŽ is a registered trademark of DuPont
VitonŽ is a registered trademark of DuPont Dow Elastomers L.L.C.

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