Cofemo BK-POL User manual

To ensure the safety and obtain satisfactory performance, please
study this operation instruction thoroughly before your operation.
BK-POL
Polarizing Microscope
Operation Manual
Contents
1.Purpose
……………………
1
2.Specification
……………………
1
3.Parts Name
……………………
3
4.Installation
……………………
5
5.Operation
……………………
6
6.Maintenance
……………………
6
7.Troubleshooting
……………………
8
Outfits
……………………
10

-1-
1.Purpose
BK-POL polarizing microscope is for the field of metallurgy, geology and
minerals.
BK-POL polarizing microscope is with gypsum(λ), mica (λ/4)sample,
quartz wedge and attachable mechanical stage. It is an ideal
instrument that has perfect function and quality.
2. Specification
2.1 Total Magnification
Objective
Eyepiece
4X
10X
20X
40X
60X
10X
40X
100X
200X
400X
600X
2.2 Objectives (Non-stress plan objective)
Magnification
N.A.
Thickness of the glass cover
4X
0.10
10X
0.25
0.17
20X(S)
0.40
0.17
40X(S)
0.65
0.17
60X(S)
0.80
0.17
2.3 Eyepiece
Type
Magnification
View Field Diameter (mm)
Cross Eyepiece
10X
20/18
Normal Eyepiece
10X
20/18

-2-
2.4 Mechanical Tube Length: ∞
2.5 Head: Seidentopf binocular (trinocular) head 30°,
Interpupillary adjustable distance is 50-75mm.
Diopter adjustable range ±5,
Anti-fungal systems.
2.6 Intermediate: 360°part division for analyzer, 2°30’per scale, lock
system
Bertrand Lens (center adjusting)
Gypsum(λ), mica (λ/4)sample, quartz wedge
2.7 Nosepiece: Quadplex or quintuple nosepiece (center adjusting),
nosepiece spanner.
2.8 Revolving Round Stage: Diameter Φ158mm, 360° part scale, 6’per
scale.
2.9 Focusing System: Coaxial coarse and fine focusing knobs, coarse
stroke 22mm.
Fine division 2µm, condenser up-down range 22mm
2.10 Condenser: Abbe condenser, N.A. 1.25, adjustable aperture,
aperture center can be adjustable.
360°part division for polarizer, 5° per scale, lock system
2.11 Electric components: Input voltage AC85-265V, 50/60Hz
Output voltage DC1.2-6V
6V/20W halogen lamp
Rotation potentiometer with power switch
Fuse 2A ф5×20
2.12 Filter: Blue (Amber, green, neutral filter optional)

-3-
3. Parts Name
Tube Fixing Hole
Eyepiece
Trinocular Head
C-mount Fixing Screw
Head Thumb Screw
Diopter Adjuster
Bertrand Lens Slip
Complementary Inlet
Analyzer
Centering
Nosepiece
Revolving Round Stage
Condenser
Polarizer
Field Diaphragm
Revolver
Aperture
Diaphragm
Centering
Screw
Condenser Thumb
Screw
Main
Body
Fixing
Screw
Main
Bod
y
Stage
Centering
Screw
Right Coarse
Focusing
Knob
Right Fine
Focusing Knob
Potentio
-meter
Clamp

-4-
Handle
Condenser
Focusing
Knob
Power
Socket
Power
Switch
Coarse Focusing Tension
Adjusting Ring
Left Coarse
Focusing Knob
Left Fine
Focusing Knob
E-intermediate
C-mount
Analyzer Screw
Objectives
Stage Lock
Screw
λSlip (First Class Red)
λ/4 Slip
Quartz Wedge

-5-
4. Installation
4.1 Installation Condition
4.1.1 The required input voltage: 85V-265V, 50/60HZ
4.1.2 Alcohol, gasoline and paper all are burnt early, please take them
away from the lamp.
4.1.3 The halogen lamp: 6V/20W, G4
4.1.4 The microscope should be used in environment of indoor
temperature 0°-40°C and maximum relative humidity 85%.
4.1.5 Please pay attention to prevent microscope from violent shake
and vibration in application and in carrying. Don’t drag it on the surface
of worktable to avoid damage to microscope and worktable.
4.2 Installation
4.2.1 Please confirm the installation condition meets 4.1;
4.2.2 Put out the main body and place it in table, and loose the main
body fixing screw, then put the cost cover out;
4.2.3 Put out the intermediate, fix it into the main body, then tighten
the main body fixing screw;
4.2.4 Fix the head into the intermediate;
4.2.5 Insert the eyepieces into the tubes;
4.2.6 Put out the dust cover of the nosepiece, and turn the coarse
focusing knob to lower the stage, and find the objective hole with yellow
mark in the nosepiece. Fix the 10X objective into the hole, and turn the
nosepiece clockwise, fix the other objectives as per the power.
4.2.7 Loose the condenser lock thumb and fix the condenser.

-6-
5. Operation
5.1 Turn the power switch and the potentiometer to adjust light to be
available;
5.2 Fix the sample on the stage, and move it into the path;
5.3 Turn the nosepiece to put 10X objective into light path, and turn the
focus knobs to get clear image.
5.4 Confirm the polarizing vibrancy direction
The polarizing vibrancy direction has set to be at west-east in factory
when the scale of the polarizing is 0°.
5.5 Check polarizing and analyzer
The field should be dark completely (when there is no sample) when
the scale of polarizer and analyzer is 0°. Please check the position of the
polarizer and the analyzer if not so.
5.6 Choose the complementary slip as per the sample, then insert into
the slip.
5.7 Put into the Bertrand Lens Slip in the condition of polarizing;
5.8 Adjust the center of the stage.
6. Maintenance
6.1 Clean microscope
6.1.1 Don’t touch the lens with hand, Dust on lens should be cleaned by
soft brush or absorbent cotton or cleaned by absorbent cotton, lens
paper with the mixture of alcohol and ether (proportion 1:4).
6.1.2 Alcohol and ether all are burnt early, please take them away from
fire. Be careful for turn on and off power.
6.1.3 Don’t clean painted metal and galvanizing metal with organic
solvent such as alcohol, ether or the mixture of the both. Silicon cloth or
soft cleaning preparation is suggested to clean it.
6.1.4 Plastic should be cleaned by soft cloth with clear water.

-7-
6.2 Environment of using and placing
6.2.1 Microscope should be used and placed in a cool, dry, non-dust,
non-shake and non-corrosive gases environment.
6.2.2 Microscope should be used in environment of indoor temperature
0°-40°C and maximum relative humidity 85%.
6.2.3 Removing equipment is suggested to be installed when
microscope used in heavy humidity area to avoid fungus and mist
damage instrument.
6.2.4 Please pay attention to prevent microscope from violent shake
and vibration in application and in carrying. Don’t drag it on the surface
of worktable to avoid damage to microscope and worktable.
6.3 Replacement of bulb
6.3.1 Turn off power, and pull out plug.
6.3.2 Wait the bulb become cool.
▲Please be sure that the bulb is cool, then follow by the nest
operations.
6.3.3 Lay aside the microscope reliably, unscrew the knurled thumb
screw of the lamp housing cover on the underside of base.
6.3.4 Pull over the lamp housing cover.
6.3.5 Pull out the bulb should be replaced, hold a new bulb with silk
cloth to avoid fingerprint and dust affect bulb brightness and service life,
and insert fully the contact pins into the bulb socket.
6.3.6 Close the lamp housing cover, and screw the knurled thumb
screw.
▲After working for above 10 hours continuously, better cut off the
microscope about 30 minutes.
6.4 Replacement of fuse
6.4.1 Cut off power of microscope, and pull out the plug.
6.4.2 Unscrew fuse cap in the back of base, take out old fuse.
6.4.3 Replace a new fuse, then screw the fuse cap.

-8-
6.5 Stop to use microscope, please cut off power, cover the dust cover,
and place it in a cool and dry environment.
7. Troubleshooting
In the period of using BK series microscope, if there is any trouble
occurs, please referring to the following sheet listed some common
troubleshooting resolve them.
Trouble
Causation
Remedy
Switch on but bulb
dark
Plug is unreliable
Plug in again
Bulb is broken
Change bulb
Fuse is broken
Change fuse
Bulb is flickering or
brightness is
unsteady
Bulb is unstable
Insert it again
Bulb is broken
Replacing bulb
Brightness of view field
isn’t enough or is
Uneven
Bulb specification doesn’t
meet the requirement
Replacing bulb
Brightness isn’t adjusted
correctly
Adjust rotation
potentiometer
Objective isn’t in correct
position
Make the objective in
correct position
The size of iris aperture is
too small
Adjust the size of iris
aperture
Brightness of view field
isn’t enough or is
Uneven
Lens (objective,eyepiece,
condenser, light collector)
has dust
Clean it
Position of condenser is
too low
Higher condenser
Image isn’t clear
(contrast or definition
isn’t enough)
Cover glass of specimen
doesn’t meet the
requirement
Use required thickness
cover glass (0.17mm)
Cover glass of specimen
isn’t in up direction
Place specimen correctly
Surface of objective lens
isdirty (especially it is
easy for the front lens of
40X objective to dip in
immersion oil)
Clean it
Immersion oil isn’t used
for 100X objective (oil)
Use immersion oil
Immersion oil doesn’t
meet the requirement
Use immersion oil
supplied by us

-9-
Trouble
Causation
Remedy
There is bubble in
immersion oil
Clear the bubble way
Size of iris aperture isn’t
proper
Adjust the size of iris
aperture
Position of condenser is
too low
Readjust the position of
condenser
One side of image is
dark or image is
moving as focusing
Objective isn’t in correct
position
Make the objective in
correct position
Specimen isn’t placed
correctly
Place specimen levelly on
stage and clip it with clamp
Objective touches
specimen as changing
low times objective to
high times objective
Cover glass of specimen
isn’t in up direction
Place specimen correctly
Cover glass doesn’t meet
the requirement
Use required thickness
cover glass (0.17mm)
Image observed by two
eyes aren’t in
superposition entirely.
Interpupilary distance
isn’t adjusted correctly
Adjust interpupilary
distance according to two
eyes
It is easy for eyes to be
tired during observing
Diopter isn’t adjusted
correctly
Readjust diopter

-10-
BK-POL Series Polarizing Microscope Outfits
Items
Specification
BK-POL
Eyepiece
WF 10X-20mm
●●
WF 10X-20 mm (Reticule 0.1mm)
●
Non-stress
Infinity Plan
Objective
4×
●
10×
●
20×(S)
●
40× (S)
●
60× (S)
○
Seidentopf
Binocular
Head
Inclined 30°,
Rotatable 360°,
Interpupilary Distance: 55-75mm.
●
Trinocular Head
Inclined 30°,
Rotatable 360°,
Interpupilary Distance: 55-75mm.
○
Nosepiece
Quadruple
●
Polarizing Unit
Rotatable 360°(Module Type, Can Be Locked)
●
Bertrand Lens
Inbuilt, Center Adjustable
●
λSlip
First Class Red
●
1/4λSlip
●

-11-
Quartz Wedge
(Ⅰ-ⅣClass)
●
Revolving Round
Stage
Rotatable 360°, Center Adjustable, Division 1°,
Vernier division 6’
●
Polarizing Attached Mechanical Stage
○
Condenser
Abbe N.A. 1.25 Non-stress
●
Polarizing Unit
with Scale
Rotatable 360°,
Can Be Locked
●
Koehler
Illumination
6V/30W Halogen Lamp
●
2 A Fuse
Spare: 1 pc
●
Filter
Blue,
○
Amber
○
Green
○
Neutral
○
C-mount
0.5×, 1×
○
Adaptor for Digital Camera
○
Note: “●”In Table Is Standard Attachment. “○” Is Optional Accessories
Packing Size: 540mm×285mm×385mm
Gross Weight: 12 kgs Net Weight: 10 kgs
BK-POL Polarizing Microscope Operation Manual