BM series
11
3.3.
Cautions During Use
(For Precision Weighing)
Note the following items to get accurate weighing data.
Discharge static electricity from the weighing material. When
weighing sample (plastics, insulator, etc.) could have a static
charge, the weight value is influenced. Ground the balance, and
Eliminate the static electricity using the built-in static eliminator.
Try to keep the ambient humidity at or above 45%RH in the room.
Use a metal shield case.
Wipe a charged material (plastic sample etc.) with a damp cloth.
This balance uses a strong magnet as part of the balance assembly,
so please use caution when weighing magnetic materials. If there is
a problem, use the underhook (on the bottom of the balance) to
suspend the material away from the influence of the magnet.
Eliminate temperature differences between the weighed sample and
the environment. When a sample is warmer (cooler) than the ambient
temperature, the sample will appear lighter (heavier) than the true
mass. This error is due to the rising (falling) draft next the sample. If
you touch the sample, the same type error will occur. Do not touch the
sample directly with your hand. Use tweezers or other tools.
Do not drop things upon the weighing pan, or place a weight
beyond the range of the balance on the weighing pan.
Make each weighing gently and quickly to avoid errors due to
changes in the environmental conditions.
We recommend that the
fine range ring
and
separation plate
are
used to avoid weighing error caused by drafts when
BM-252
displays
a weighing value in unit of 0.01 mg (minimum display: 0.01 mg).
We recommend that the
small fine range ring
,
fine range ring
and
separation plate
are used to avoid weighing error caused by
drafts when
BM-22
and
BM-20
display a weighing value in unit of
0.01 mg and 0.001 mg (minimum display: 0.01 mg and 0.001 mg).
To reduce the influence of breezes, minimize operation of doors of
the weighing chamber.
The weighing value of
BM-22
and
BM-20
may change after the
stable indicator is displayed. We recommend that you set a
constant wait time (approx. 10 sec.) between displaying the stable
indicator and reading the value.
If the contamination may be a problem, do not use the weighing
chamber for the sampling operations to prevent the scattering of
matter.
Take into consideration the affect of air buoyancy on a sample
when more accuracy is required.
Do not use a sharp instrument (such as a pencil or ball point pen) to
press the keys, use your finger only.
Grounding
Metal case
Charged material
Magnet material
40°C
20°C
Draft
Weighing pan
Fine range ring
BM-252
Shock
BM-20
BM-22
Fine range ring
Small fine range ring
Summary of Contents for BM-20
Page 1: ...Analytical Balance BM 20 BM 22 BM 252 BM 200 BM 300 BM 500 1WMPD4002195B...
Page 96: ...94 BM series MEMO...
Page 97: ...BM series 95 MEMO...
Page 98: ...96 BM series MEMO...
Page 99: ......
