OMM 3000 Near IR Reflectance Moisture Analyzer

The OMM-3000 NIR Online Moisture Meter is a microprocessor controlled infra-red reflectance moisture analyzer.

The latest feature is a new Linearized Base Line algorythm for high signal to noise ratio allowing for high sensitivity and excellent repeatability.

The Instrument can be connected using a standard computer for complete control and calibration or a control unit for simplified in-process control.

With a PC connection: The OMM-3000 can be used as an integrated process control system using the RS-485 interface. Up to 32 Sensor Units can be used and controlled. 10 calibration curves can be stored for each sensor. The software has total control of each sensor including initial setting, calibration, digital and graphical display, diagnostics and more.

New! - With a Control Unit Connection: Up to 8 Sensor units can be connected to the control unit. 10 calibration curves can be stored for each sensor.

Sensor Information:

The sensor unit uses a dual pbS filtering technique to compensate long term light drift. The double filtering technique has excellent accuracy for a wide range of moisture levels including shiny samples.

3 Filters are used to measure moisture. Two moisture ranges are available from 0 to 40% and from 40 to 90%.

The communication output from the OMM-3000 is via RS-485, it is possible to connect up to 32 units which can be controlled by a single PC. The connection to a PC is via RS-232. The output from the OMM-3000 is via RS-485. An RS-485/232 converter is used to connect multiple unit sensors to the PC.

The unit is fixed by four screws above the sample to keep the distance constant between the sample and the unit. The OMM-3000 unit is suitable for measuring moisture of moving samples because of a reflectance non-contact method.

The optimum sample speed is less than 2-3 meter/sec, and for improved accuracy, the surface of the sample should be as flat as possible.

After installing and calibrating the OMM3000 sensor, the PC can be removed from the system and instead of a PC, an LED display can be used (or Controller) to monitor the value of moisture via the display(option) which is connected to an analog output(4-20mA).

The OMM3000Pro software is installed on a standard PC using Windows 95 or 98) from a standard 1.44Mb Floppy disk.

This control software includes the following functions:

• Moisture Range
  
• Time Constant(data averaging)
  
• Alarm range
  
• Moisture level
  
• Absorbance level
  
• Zero Calibration
  
• Calibration curve preparation (with Automatic linear or non-linear calculations)
  
• Hold and Preset(Standby mode)
  
• New OMM Unit(sensor) registration
  
• Adjustment of analog current output.
  

Functions:

Range	0.1~40%, 40~90%
Time Constant	1~99 second (Moving average time)
Measuring Time	Less than 200mS
Target Area	50mm square (at 450mm height)

Measurable Sample Types:
Instant coffee, Tobacco, Flour, Coke, Clay, Paper, Woodboard, etc.,
The accuracy increases with smaller and more uniform particle.

Output for control and display
4~20mA,Alarm contact (high & low)
For PC interface: Standard RS-232, COM1 or COM2 port using RS485 converter.

Environment control
Dust eliminator, Air-purge hood
Water or air cooling System (when environmental temp is over 40C)

Maintenance:

Lamp Life time	30,000 Hours
Motor Life time	20,000 Hours
Electric Power	AC100~240V automatic setting, 70VA

Accuracy:
The accuracy depends on the condition of the sample. These conditions include conveyer speed, height of sample, heat and humidity. Roughly, the accuracy could be 0.1% to 0.5% between 0% to 10% and 0.1% to 1% between 10% to 30%.
The repeatability is within 0.005 at Zero plate insertion. Generally, the calibration equation is shown Y=a+bX (Y is moisture %, X is absorbance). When the b is less than 50 (typical value of many samples), the repeatability of moisture is less 0.25%. The calibration of the system with known standards is critical to obtaining accurate results.

Calibration Control:

Linear, Quadratic or Cubic line fitting algorythms
Up to 20 data points per calibration routine
Up to 10 calibration routines per sensor

How to perform the calibration:
Before making calibration, it is necessary to make a few samples(at least three) with known moisture. This moisture is measured by weight typically. It is important to allow 2 or 3 days for equilibration if water is added to the sample, because the water must be uniformly mixed in the sample. The accuracy of the results is directly dependant on the accuracy of the standards. These standards should be near the actual moisture level of the measuring sample.
In this software, there are three calibrate equations (linear, quadratic and cubic). It is necessary to have at least 3 standards for the linear calibration curve and to have five or more standard samples when using the quadratic or cubic calibration curve. The best fit curve using the selected equation is performed automatically.
The standard deviation and correlation coefficient is also displayed.
Up to 10 calibration curves can be stored in memory.

Application Information:
Sample analysis and application information may be available depending upon location and sample type. Analyticon may request samples to be run in our applications laboratory prior to quoting a particular system.

Ordering Information:
The OMM-3000 is a special order product with application specific manufacturing requirements. Partial payment with order may be required and 60 to 90 day delivery time may be quoted.

System Information:

For additional information,
please contact Analyticon Instruments.

2003-Information and pricing subject to change without notice.