Rice Lake FX-i WP Series, A&D Weighing - Manual (Page 12)

10
3-2 During Use
The FZ-i WP series and the FX-i WP series balance has a casing with
high sealing performance due to its dust-tight and waterproof design.
Therefore, a very subtle change in the atmospheric pressure in the
installation site, for example, generated by opening or closing the door,
affects the weighing and may yield an unstable weight value. Wait for
the atmospheric pressure to stabilize before weighing.
If the residue of a powdery or liquid material is left on the waterproof
diaphragm or the pan boss, it may cause weighing errors. Clean them
before weighing.
If the waterproof diaphragm is deformed due to overloading, it may
cause weighing errors. Remove the load and wait for the waterproof
diaphragm to restore to the original shape before continuing with
weighing.
Discharge static electricity from the material to be weighed
(hereinafter referred to as the sample). When a sample could have a
static charge, the weight data is influenced. Ground the balance and
try the following:
Eliminate static electricity using the optional AD-1683 DC static
eliminator.
Try to keep the ambient humidity above 45%RH.
Use a metal shield case for a charged sample.
Wipe charged plastic samples with a moistened cloth.
This balance uses a strong magnet as part of the balance assembly,
so please use caution when weighing magnetic materials such as iron.
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 the temperature difference between a sample and the
environment. When a sample is warmer (cooler) than the ambient
temperature, the sample will be lighter (heavier) than the true weight.
This error is due to a rising (falling) draft around the sample.
Make each weighing gently and quickly to avoid errors caused by the
evaporation of moisture from the sample or the absorption of moisture
by the sample.
Do not drop things upon the weighing pan, or place a sample on the
pan that is beyond the balance weighing capacity. Place a sample in
the center of the weighing pan.
Do not use a sharp instrument such as a pencil to press the keys. Use
your finger only.
Press the RE-ZERO key before each weighing to eliminate possible
errors.
Calibrate the balance periodically so as to eliminate possible errors.
Take into consideration the affect of air buoyancy on a sample when more accuracy is required.