Nova-Tech Density Kit User Manual

Adam Equipment

AE DENSITY DETERMINATION KIT

(For PW and PGW BALANCES)

(P.N. 8290, Rev. A2, January 2007)

© Adam Equipment Company 2007

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© Adam Equipment Company 2007

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1.0 INTRODUCTION

The Density Determination Kit from Adam Equipment allows the users of
PW and PGW series of balances to determine the density of solids and
liquids directly using the internal program of the balance.

2.0 FEATURES

• Easy to use - all the activities are described by a message on the
display for user.

• Reliable (all the calculations are done by the balance).

• Speed of test (the result is shown immediately after the sample is

placed into the water or the float is placed into the liquid).

• Accuracy (before every measurement the balance is automatically
zeroed. The user also enters the temperature of the liquid to
account for density variations due to temperature or can enter the
density of the liquid directly).

• Possibility to print the results or to send them to a PC for further
analysis.

© Adam Equipment Company 2007

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3.0 COMPONENTS

The kit consists of the following components-

1. Glass Float of known volume, with

2. String

One unit

3. Hook

4. Thermometer

5. Base to support beaker

6. Beaker

7. Pan and Hanger – This replaces the original pan of the balance
during density determination. Pan provided in the kit is different for
use with PW and PGW. For PW, this comes as a single part. For
PGW, this comes in two separate parts and need to be assembled
(see section 4)

8. Sample pan consists of Top Pan, String and bottom pan

9. Clamp for thermometer

A spare wire frame is provided to store the glass float in the hanging
position when not in use (not shown in the diagram).

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4.0 INSTALLATION

• Replace the original pan with the pan and hanger (7) supplied

with the kit.

NOTE: For the kit supplied for PGW, the pan with hanger (7)

needs to be assembled. Remove the two nuts from the hanger
ends, insert the two ends through the holes of the substitute pan
from top and fasten the nuts at the bottom of the pan to keep the
hanger in the upright position.

• Place the beaker support (5) over the hanger so that they do not

touch each other.

• Fill the beaker (6) with either distilled water at room temperature,

alcohol or another liquid of known density. For determination of a
liquid’s density add the liquid to the beaker.
used to fill the beaker must cover the bottom pan of the sample
pan (8) as well as the solid item being put in this pan.

NOTE: The liquid

• Fix the thermometer clip (9) on the beaker wall and insert the

thermometer (4) into the liquid.

• Hang the sample pan (8) on the hanger (7) if the kit is to be used

for density determination of solid.

• Hang the glass float (1) on the hanger (7) when the kit is being

used for the density determination of liquid.

PGW with the Density Kit installed

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5.0 MEASUREMENT OF SOLID DENSITY

To perform the density of solids test, the user must have a method to
immerse the solid item in a chosen liquid. The density of the liquid must
be known or determined from a look-up table.

For water and ethanol the density will be calculated based on the
temperatures entered using the numeric entry method, when asked by
the balance.

Numeric Entry Method-

To set a value when required, use the keys as given below-

- [Up] and [Down] keys to increase or decrease the flashing digit,

- [Advance] and [Back] keys to advance or move back the digit

and

- [Enter] key to accept the value

Steps:

• After installing the Density Determination Kit, tare the balance by

pressing the [Î0/TÍ] key

• Press [Mode] and then [Up] and [Down] keys to select “Density”

• Press [Enter] to enter the Density mode

• Press the [Up] and [Down] keys to select the Solid or Liquid

method when “DENSITY SOLId”” or “DENSITY LIqUId” is
displayed

• Press [Enter] to select the “DENSITY SOLId” method

• Press [Up] or [Down] to select the liquid of choice- Water, Ethanol

or Other

• Press [Enter] to select the choice. For water and Ethanol the

temperature will be asked for. Enter the temperature using the
numeric entry method

• For the “Other” choice the density will be asked for. Enter the

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density (g/cc) using the numeric entry method

• Press [Enter] to continue

• The balance will request for the weight of the sample in air by

displaying “AIR WEIGHT”. Place the solid item on the top pan.

When the sample pan is stable, press [Enter] to determine the

value

• After completion of the air weighing, the balance will request for the
weight in liquid by displaying “LIQUID WT”. Submerge the solid

item into the liquid. When stable, press [Enter] to start the liquid

weighing. The balance will compute the density of the sample and
display it as “DENSITY XXXX g/cc”

• After completion of the liquid weighing, remove the solid item from
the pan

• Press [Mode] to continue with a new sample or press [Esc] to

return to normal weighing

6.0 MEASUREMENT OF LIQUID DENSITY

When finding the density of a liquid, it is necessary to weigh a sample of
known volume in air and then in the chosen liquid. The volume of the
sample must be entered using the numeric entry method. The last known
volume is stored for use at any time.

In the AE density determination kit, a glass float has been provided with
the volume of the float marked on its support, i.e. 10.5089

Steps:

• After installing the Density Kit, tare the balance by pressing the

[Î0/TÍ] key

• Press [Mode] and then [Up] and [Down] to select Density

• Press [Enter] to select the Density mode

• Use [Up] and [Down] to scroll through the solid or liquid method

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• When “DENSITY LIqUId” is displayed, press [Enter]

• The volume will be asked for. Enter the volume using the numeric

entry method or continue using the last volume entered

• Press [Enter] to continue

• The balance will request for the weight in air by displaying “AIR

WEIGHT”. Place the glass plumb supplied with the density
determination kit in air on the weighing pan. When stable press

[Enter] to start the air weighing

• On completion of the air weighing, the balance will request for the
weight in liquid by displaying “LIQUID WT”. Submerge the glass

float in the liquid. When stable press the [Enter] key. The balance

will compute the density of the liquid and display it as “DENSITY
XXXX g/cc”

• Remove the float

• Press [Mode] to continue with a new liquid sample or press [Esc]

to return to normal weighing

NOTE:

For best accuracy follow these suggestions-

• Samples should be tested more than once and the average value
be taken.

• Only distilled water should be used.

• The water should be at a stable temperature.

• The sample must be degreased.

• The sample should not be porous. If it is porous then special

preparation might be necessary.

• Ensure that the sample is completely covered by about 10mm of
the liquid at the top.

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• Be certain any air bubbles are removed.

• Dry the sample completely between tests.

• Be very careful not to transfer water to the top pan when using

tweezers.

• Samples should be 5 grams or greater.

• Degrease the glass float before using.

• Dry the float completely between each test. Be careful not to put a

static electric charge on the glass float. It may be necessary to use
an anti-static cleaner on the float.

• Wash the beaker before filling it with any liquid.

• Place the sample on the weighing pans carefully to avoid shocks to

the balance. Wait till the sample pan unit (8) or the glass float (1),

whichever is in use is stable before pressing the [Enter] key during

the operation.

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APPENDIX A

A method to determine the volume of the float

To determine the volume of the float the following equation can be used.

V

A - mass of float in air [g]
B - mass of float in distilled water [g]
V - float volume [cm
ρ – density of distilled water [g/cm

d – density of air

The following formula is used to determine the density of air

(d) to use in the above equation.

0,0012932 p
d = x

Where,
0,0012932 is the density of air [g/cm³] at 0°C and standard
air pressure (1013,25 in Millibars)
0,0036728 is the “Temperature Co-efficient” (the amount by
which the air expands in volume at a constant pressure as
the temperatuire changes)

t - temperature of air [
p - pressure of air in Millibars [mb]

The procedure would be to measure the mass of the float in air (value A)
and the mass while it is submerged in distilled water (value B) and then

put the values in for the water density (ρ) and air density (d) at the

temperature and pressure measured using other instruments.

The values for water density at various temperatures can be found in
most chemistry or physics reference texts. A partial list is given in the
following Appendix.

A - B
= [cm

ρ - d

3

]

3

]

3

]

1+ 0,0036728 x t 1013,25

o

C]

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APPENDIX B

DENSITY OF DISTILLED WATER

WATER

TEMPERATURE

0ºC 0.99984 g/cm

4ºC 0.99997 g/cm
10ºC 0.99970 g/cm
15ºC 0.99910 g/cm
20ºC 0.99821 g/cm
25ºC 0.99705 g/cm
30ºC 0.99565 g/cm

1

0.9995

DENSITY

3

3

3

3

3

3

3

0.999

0.9985

0.998

Series1

0.9975

0.997

0.9965

0.996

0.9955

0 5 10 15 20 25 30

Density of Distilled Water versus temperature

ºC 0 1 2 3 4 5 6 7 8 9

0
10
20
30

0.99984 0.99990 0.99994 0.99996 0.99997 0.99996 0.99994 0.99990 0.99985 0.99978

0.99970 0.99961 0.99949 0.99938 0.99924 0.99910 0.99894 0.99877 0.99860 0.99841

0.99820 0.99799 0.99777 0.99754 0.99730 0.99704 0.99678 0.99651 0.99623 0.99594

0.99565 0.99534 0.99503 0.99470 0.99437 0.99403 0.99368 0.99333 0.99297 0.99259

© Adam Equipment Company 2007

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ADAM EQUIPMENT is an ISO 9001:2000 certified global organisation with more than 30 years

experience in the production and sale of electronic weighing equipment. Products are sold through a
world wide distributor network supported from our company locations in the UK, USA, SOUTH AFRICA
and AUSTRALIA.

ADAM’s products are predominantly designed for the Laboratory, Educational, Medical and Industrial

Segments. The product range is as follows:

-Analytical and Precision Laboratory Balances

-Counting Scales for Industrial and Warehouse applications

-Digital Weighing/Check-weighing Scales

-High performance Platform Scales with extensive software
features including parts counting, percent weighing etc.

-Crane scales for heavy-duty industrial weighing

-Digital Electronic Scales for Medical use

-Retail Scales for Price computing

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© Copyright by Adam Equipment Co. Ltd. All rights reserved. No part of this publication

may be reprinted or translated in any form or by any means without the prior permission

of Adam Equipment.

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specifications and design of the equipment without notice.

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complete and accurate when issued. However, we are not responsible for

misinterpretations which may result from the reading of this material.

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