Home Science Tools BS-2610 User manual

BS-2610
Triple Beam Balance
Operating Instructions
665 Carbon Street, Billings, MT 59102
Phone: [phone]
Fax: [phone]
Web: www.HomeScienceTools.com
Copyright 2005 by Home Training Tools, Ltd.
A
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Construction and Application
This triple-beam balance is constructed to provide years of reliable,
trouble-free operation. The beam is made of high-quality aluminum alloy
for precise, consistent results. It has a tiered design for better visibility
and faster operation. The agate beam bearings and steel knife-edges
provide high accuracy, repeatability, and durability. The stainless steel
pan provides long life in varied service conditions. The magnetic
dampening system makes the balance faster and easier to use.
This balance is suitable for all junior high and high school level science
courses, including physical science, earth science, biology, chemistry,
and physics.
Specifications
Capacity: 610g without attachment weights
2610g with attachment weights
Sensitivity: 0.1g
Readability: 0.1g
Beam Calibrations: Front Beam 10g x 0.1g
Rear Beam 100g x 10g
Center Beam 500g x 100g
Unpacking
1. Carefully lift the balance from the foam packing carton and set it on
its base on a smooth, flat surface.
2. Remove the three attachment weights from the carton.
3. Remove the split rubber washer wedged under the pan assembly.
4. Remove the rubber washer located above the pointer on the end of
the beam (If one is present.) Make sure no bits of styrofoam packing
are wedged around the pointer or in the dampening system.
5. Remove the rubber bands holding the sliding weights in place on the
beam.
6. Slide the weights to the left, to the "0" position on the beam.
Care and Maintenance
Keep your balance clean by wiping it down after each use. Use a soft
cloth lightly moistened with water or a general-purpose household
cleaner. Be sure your balance is clean and dry before storing it. An
optional dust cover will keep your balance free of dust when not in use.
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Setup and Zeroing
After placing your balance on a smooth, flat surface, move each of the
three sliding weights to the zero position on the left side of the beams. Be
sure the 10g and 100g sliding weights are fully seated in the notches cut
into the beams near the “0” mark. Be sure the indicator point on the 1g
sliding weight is centered above the "0" on the front beam. The pointer
should now be near zero. (Zero is the "balanced" point at which the white
line on the pointer matches the zero mark on
the end of the balance.)
Now you can precisely zero your balance.
Adjust the knurled zero knob, located on the left
end of the beam, under the pan, until the white
line on the pointer exactly matches the zero
mark on the end of the balance. This may take
several attempts, as wait for the pointer to stop
moving after each adjustment. Turning the zero knob clockwise brings
the pointer down, while turning the zero knob counter-clockwise brings
the pointer up. If you run out of adjustment on the knob, check that the
beam weights are fully seated in the notch closest to the “0” mark.
Once you have zeroed your balance, it is ready for use. You will need to
check the zero adjustment periodically, especially after moving or
transporting your balance.
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100
g
1
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Wei
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ht
10
g
Pan Pointe
r
Beam
Zero
Knob
Attachment
Wei
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ht
Dampening
S
y
stem
Attachment
Weights
Beam

Weighing Operation
Place the object to be weighed on the center of the pan and proceed as
follows:
1. Starting with the center beam, move the 100g weight to the right one
notch at a time until the pointer drops. Then move the 100g weight
back to the left one notch.
2. Now with the rear beam, move the 10g weight to the right one notch
at a time until the pointer drops. Then move the 10g weight back to
the left one notch.
3. Finally with the front beam, nudge the 1g weight to the right until the
pointer reaches the zero position.
4. Add up the weight positions on each of the three beams to get the
weight of the object. Read the 1g weight on the front beam to the
nearest 0.1g.
Your balance has a total capacity of 610g using the sliding weights on the
three beams.
Attachment Weights
The attachment weights extend the capacity
of your balance up to 2610g. These weights
hang on the attachment weight pivots located
on the pointer end of the beam. Only two
attachment weights can be used at a time.
The attachment weights increase the capacity
of your balance as follows:
The 500g attachment weight used alone increases the capacity to
1110g
A 1kg attachment weight used alone increases the capacity to 1610g
500g and 1kg attachment weights used together increase the
capacity to 2110g (one on each pivot point)
Both 1kg attachment weights used together increase the capacity to
2610g (one on each pivot point)
Note that the attachment weights actually weigh much less than 500g
and 1kg. This is because of the moment arm distance between the
attachment weight pivot points and the beam bearings.
Limited Warranty
Home Training Tools warrants this product against defects in materials
and workmanship for one year from the date of purchase. During the
warranty period we will repair or replace, at our option, any defective
component(s) at no charge. You will need to return your balance, freight
prepaid, to Home Training Tools for warranty service. Please call 1-800-
860-6272 for details.
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