Polarizing Light Microscopes MT6800 Series

Meiji Techno offers the MT6800 Series Combo PLM - PCM (Polarized Light and Phase Contrast) Microscopes for Asbestos fiber identification applications. Meiji Techno manufactures these microscopes pursuant to NIOSH 9002 Reference methods and NIOSH 7400 and OSHA ID 160 Reference methods. Click HERE for more information regarding Asbestos Identification by PLM (Polarized Light Microscopy) for Bulk Fiber Identification. Click HERE for more information regarding Asbestos Fiber Counting by Phase Contrast Microscopy. 

Each model comes with Strain free Plan DIN brightfield POL objectives, rotatable stage with 360 degree graduations, POL/PHASE/Dispersion Staining Abbe condenser and built-in Koehler illumination as standard equipment.

VIEWING HEADS
Model MA952 is the Siedentopf-type binocular head and Model MA953 is the trinocular head for camera integration. Each head has the 23.2mm eyetubes inclined at 30 degrees with the left eyetube having graduated diopter settings. 

The interpupillary distance is adjustable between 53mm - 75mm. An 80/20 beamsplitter for the trinocular tube can be engaged for photo work.

Each head has the new integrated reticle angle compensation system. When the IP distance or number is changed, the crossline reticle remains perpendicular in the FOV.

EYEPIECES
10X Widefield High Eyepoint eyepiece F.N. 20, 10X Widefield High Eyepoint focusable eyepiece that has a 21mm crossline reticule and guide pin, and 10X Widefield High Eyepoint Compensating Focusing eyepiece, F.N. 20 with Walton & Beckett reticle are standard.

OBJECTIVE CHANGER
The smooth-operating, ball bearing mounted, quadruple nosepiece provides effortless objective changes.

OBJECTIVES
Meiji Techno offers an assortment of U. Planachromat Phase and S. Planachromat Polarizing Infinity Corrected objectives.

STAGE
Ceramic coated 360 degree rotatable fully indexed stage with vernier and stage clips.

CONDENSER
Strain free Abbe condenser, N.A. 1.25 with centerable annuli for 10X, 20X, 40X phase or 10X, 20X, 40X dispersion staining objectives in sliding mount, with iris diaphragm and dovetail mount. 

ILLUMINATION
Powerful 30 watt transmitted light Koehler halogen illumination provides enhanced image quality and brightness for the observation of specimens. 

ACCESSORIES
All MT6800 Series models come with a first order red compensating plate (also called Gypsum or Sensitive Tint Plate), an analyzer in sliding mount, Bertrand lens, Blue Clear and Green Interference filters, Centering Telescope, and Stage Micrometer.

MT6800 Series ABESTOS PLM - PCM MICROSCOPE

Model	Head	Eyepieces	Objectives	Condenser	Illumination
MT6820 $6,200.00	Bino.	(1) KHW10XCP Focusing with guide pin and crossline reticle, (1) KHW 10X, F.N. 20 O.D. 23.2mm	DIN Strain Free Plan 10x, 20x, & 40x, & 10x Dispersion Staining, & U. Plan 40x Phase	Strain Free Abbe N.A. 1.25 w/ slider for dispersion staining and phase objectives	Transmitted light Koehler Illuminator 6V 30W halogen auto voltage sensing with intensity control.
MT6830 $6,300.00	Trino.	(1) KHW10XCP Focusing with guide pin and crossline reticle, (1) KHW 10X, F.N. 20 O.D. 23.2mm	DIN Strain Free Plan 10x, 20x, & 40x, & 10x Dispersion Staining, & U. Plan 40x Phase	Strain Free Abbe N.A. 1.25 w/ slider for dispersion staining and phase objectives	Transmitted light Koehler Illuminator 6V 30W halogen auto voltage sensing with intensity control.

FILTERS
MA289/05 * Blue clear daylight filter, 29.8mm diameter, unmounted (Fits in filter slot
below swing-out polarizer) 30.00
MA759 * Green interference filter 546nm, 29.8mm diameter, unmounted (Fits in filter
slot below swing-out polarizer) 98.00

Asbestos Identification by
PLM (Polarized Light Microscopy)
For Bulk Fiber Identification

Methodology for PLM Analysis: NIOSH 9002
This method is useful for the qualitative identification of asbestos and the semi-quantitative determination of asbestos in bulk samples. This method measures the percentage of asbestos as perceived by the analyst in comparison to standard projections, photographs and experience. The quality of the results are dependant upon the skill and judgment of the operator. 

Required Microscope Equipment

Polarized Light Microscope 100X thru 400X with 10X Dispersion Staining Objective (see below) 
Stereo microscope 10X thru 45X. 
Dispersion Staining Objectives
Dispersion staining is a process by which color is imparted to colorless objects with the refractive index measured and used to identify the object being tested. The Meiji Dispersion Staining Objective is a 10X pre-centered central stop objective for 160mm tube length microscopes with RMS mounting threads. The technique differentiates between the refractive indices of the particulate solid and the liquid medium in which the solids are immersed. This method is most commonly used in asbestos fiber testing. The central stop positioned inside the Dispersion Staining Objective achieves certain colors at the perimeter of the fibers depending on the refractive indices between the fiber and the suspension medium.

Asbestos Fiber Counting by
Phase Contrast Microscopy

Methodology for PCM Analysis: NIOSH 7400 & OSHA ID160
Phase contrast microscopy is the method that is primarily used for estimating asbestos concentrations of airborne fibers. This method is quick and can be performed on-site for a rapid determination of concentrations of asbestos fibers in the air. Phase contrast microscopy does not positively differentiate between asbestos and other fibers. Positive identification of asbestos fiber must be performed using PLM (Polarized Light Microscopy) or Electron Microscopy (Method 7402)

Required Microscope Equipment
Positive phase contrast microscope with 10X Brightfield and 40X Phase objectives, GIF (Green Interference Filter), Walton & Beckett reticle Type-22G and a stage micrometer with 0.01mm divisions.

Required Test Slide
The HSE/NPL Mark II Phase Shift Test Slide checks or standardizes the visual detection limits of the phase contrast microscope. The HSE/NPL Test Slide consists of a conventional glass microscope slide with seven sets of parallel line pairs of decreasing widths. The microscope must clearly resolve line pairs 1 thru 3. Line pairs 4 and 5 must be at least partially visible. Line pairs 6 and 7 must be invisible. A microscope which fails to meet these requirements is either too low or too high in resolution and cannot be used for asbestos detection. 

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