The Class III Balance
has a sensitivity requirement of 6 mg, meaning that as much as 6 mg could be added to or removed from the pan before the balance marker will move 1 division.
Which prescription balance has a sensitivity requirement of?
A torsion prescription balance has a sensitivity requirement of
6.5 milligrams
.
What is the sensitivity requirement?
SENSITIVITY REQUIREMENT – The balance should have a
maximum sensitivity of 6 mg with no load and with a load of 10 g on each pan
. You don’t have a 6 mg weight in your weight set, so you will use multiples of 10 mg weights in this test. … Level the balance to get the marker in the middle of the plate.
What is a sensitivity requirement of a Class A torsion balance?
The sensitivity requirement or limit of a Class A balance is defined as
a pointer shift of not less than one index-scale division when 6 mg has been added to a pan
.
What is the sensitivity of a balance?
A balance is said to be sensitive
when it can register small differences in weight
. The balance beam is most sensitive when its center of gravity lies slightly below its rotation axis.
What quantity is least Weighable?
If we know the sensitivity of the balance (i.e. the potential error) we can calculate
the percentage of possible error when any amount of the substance is weighed
. … This weight is referred to as the least weighable quantity (L.W.Q.).
When would you use a Class A torsion balance quizlet?
When using a Class A Torsion balance to weigh Acetaminophen powder: The weight
goes
on the right pan and the powder goes on the left pan. The AWP for a drug is $33.50 with a 15% discount from the wholesaler.
What is the sensitivity of an analytical balance?
The rated sensitivity of an analytical balance is that
amount of weight which will change the sum of the turning points of the pointer one quarter of one division on the index scale
.
What is a class B balance?
The Class B balance is
optional equipment in the pharmacy
, which is used to weigh loads of more than 648 mg, and must be conspicuously marked “Class B.”
What is the maximum capacity for a Class A balance?
The balance has a sensitiviry requircment of6 mg, with no load and with a load of 10 g on each pan. Most hav€ a maximum capacity of
120 g
and bear a statement o that effect.
How does a torsion balance work?
It is based on the principle that
a wire or thread resists twisting with a force that is proportional to the stress
. The torsion balance consists essentially of a wire or thread attached at one end and arranged in such a way that a force applied at the other, or free, end tends to twist it out of shape.
What is the sensitivity of an electronic balance?
electronic balances. These balances accurately weigh objects with masses of up to 300 g to two or 3 decimal places; that is to 0.01 or 0.001 g (
1 mg
). At a sensitivity of 1 mg, this balance is very susceptable to air currents.
What is the sensitivity requirement of a counterbalance?
It has a sensitivity requirement in the range of
+/-100 mg.
Because of its reduced sensitivity, a counterbalance is not used in prescription compounding but rather for tasks such as measuring bulk products (e.g., Epsom salts).
Why very sensitive balance should be used to measure mass?
An analytical balance is
so sensitive that it can detect the mass of a single grain of a chemical substance
. Thus, if a method of direct weighing is used, the substance ought to be added to the tared container which will hold it, NEVER directly to the pan or even to weighing paper placed on the pan.
