BM series
15
3.3.
Precautions During Use
Note the following items to get accurate weighing data.
Discharge static electricity from the weighing sample. When a
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 ionizer.
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 (refer to "
13. Underhook
") to
suspend the material away from the influence of the magnet.
Eliminate temperature differences between the weighing 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 around the sample. If
you touch the sample, the same type of 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 errors caused by drafts when weighing using
the
BM-252
(readability: 0.01 mg).
We recommend that the
small fine range ring
,
fine range ring
and
separation plate
are used to avoid weighing errors caused by drafts
when
weighing using the
BM-20
or
BM-22
(readability: 0.01 mg and
0.001 mg). To reduce the influence of breezes, minimize operation of
doors of the weighing chamber. In addition, in order to weigh more
accurately while reducing the effects of the surrounding environment,
attach the slide breeze break to the weighing chamber.
The weighing value of the
BM-5
,
BM-5D
,
BM-20
and
BM-22
may change after the stabilization indicator is displayed. We
recommend that you set a certain amount of wait time (approx. 10
seconds) before reading the value after the stabilization indicator is
displayed.
If contamination may be a problem, perform sampling operations
outside the weighing chamber in order to prevent the sample from
scattering in the weighing chamber.
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
Magnetic material
40°C
20°C
Draft
Weighing pan
Fine range ring
BM-252
Shock
BM-5
BM-5D
BM-20
BM-22
Fine range ring
Small fine range ring
Slide breeze break
BM-20
BM-22
Summary of Contents for BM-5
Page 1: ...Analytical Balance BM 5 BM 5D BM 20 BM 22 BM 252 BM 200 BM 300 BM 500 1WMPD4002195E...
Page 8: ...6 BM series...
Page 115: ......
