DENSITY DETERMINATION KIT
GX-124AE/GX-224AE/GX-324AE
GX-124A/GX-224A/GX-324A
GF-124A/GF-224A/GF-324A

1WMPD4003962A

This Manual and Marks
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Z535.4 (American National Standard Institute: Product Safety Signs and Labels). The
meanings are as follows:
WARNINGCAUTIONNote

A potentially hazardous situation which, if not avoided, could
result in death or serious injury.
A potentially hazardous situation which, if not avoided, may
result in minor or moderate injury.
Provides information useful for the user to operate theinstrument.

This is a hazard alert mark.

NoteThis manual is subject to change without notice at any time to improve the product.

The contents of this manual and the specifications of the instrument covered by this manualare subject to change for improvement without notice.
© 2019 A&D Company Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, or translated into any
language in any form by any means without the written permission of A&D Company Ltd.

Contents
1.

INTRODUCTION ...............................................................................................................................................4
1-1. Precautions ........................................................................................................................... 4

2.

UNPACKING THE KIT ......................................................................................................................................43.

DENSITY MEASUREMENT PRINCIPLES .......................................................................................................5
3-1. Density ................................................................................................................................. 5
3-2. Specific Gravity ..................................................................................................................... 5
3-3. Archimedes’ Principle Of Density Measurement ......................................................................... 5
3-4. Density Of A Solid .................................................................................................................. 5
3-5. Density Of A Liquid ................................................................................................................. 5

4.

ERROR FACTORS ............................................................................................................................................6
4-1. Buoyancy Of Air ..................................................................................................................... 6
4-2. Volume Of Float ..................................................................................................................... 6
4-3. Temperature Of Liquid ............................................................................................................ 6
4-4. Influence Of Wire ................................................................................................................... 6
4-5. Surface Tension ..................................................................................................................... 7
4-6. Bubbles ................................................................................................................................ 7

5.

MEASURING THE DENSITY OF A SOLID .......................................................................................................8
5-1. Assembling The Kit ................................................................................................................ 8
5-2. Measuring The Density Of A Solid ............................................................................................ 9

6.

MEASURING THE DENSITY OF A LIQUID.................................................................................................... 11
6-1. Assembling The Kit: ............................................................................................................. 11
6-2. Measuring The Density Of A Liquid......................................................................................... 117.

DENSITY MEASUREMENT USING THE GX-A / GF-A BALANCE ...............................................................13
7-1. Preparation Before Measurement (Settings of the Function Table） ........................................... 14
7-2. Measuring Solid Density (Specific Gravity), Function Table............................................... 20
7-3. Specifying Liquid Density ...................................................................................................... 23
7-4. Measuring Liquid Density (Specific Gravity), Function Table............................................. 26
7-5. Specifying Volume of Float .................................................................................................... 29

8.

FREQUENTLY ASKED QUESTIONS .............................................................................................................31

9.

WATER RESISTANT DIGITAL THERMOMETER AD-5625 ................................................................................32
9-1. For Safe Use ....................................................................................................................... 32
9-2. Precautions When Handling .................................................................................................. 32
9-3. Each Part Name .................................................................................................................. 33
9-4. Replacing The Battery .......................................................................................................... 34
9-5. Operating the Thermometer .................................................................................................. 35
9-6. Daily Care ........................................................................................................................... 38
9-7. Specifications ...................................................................................................................... 383

1.

Introduction

Thank you for your A&D purchase! This is the instruction manual for the density determination kit.
The density determination kit can be easily used to measure the density of solid or liquid when it is combinedwith the following electronic balances.
GX-124AE/GX-224AE/GX-324AE
GX-124A/GX-224A/GX-324A
GF-124A/GF-224A/GF-324A
Before using the density determination kit, please read this instruction manual thoroughly.

1-1.

Precautions

This density determination kit allows the density or specific gravity of a solid or liquid to be measured.
However, the results of measurements may be affected by various factors that could cause errors, therefore
we cannot guarantee them to be 100 % accurate.
Do not use the density determination kit for measuring the density of chemically active substances.
After using the density determination kit, clean all surfaces to remove rust and oxides.
The balance is precision instrument, so avoid shocks or excessive loads.
To improve measuring accuracy, allow the temperature of liquid (water) and sample (solid) to equalize to theambient room temperature and perform measurement in a stable environment.

2. Unpacking The Kit
0.2

Float

Wire

Density pan

Float hook

Thermometer clamp

Density pan standLiquid container
PMP Beaker

Kit boxStores the kit after use.
4

ThermometerTweezers

Beaker stand3.

Density Measurement Principles

3-1.

DensityDensity refers to the total mass of a sample per unit volume.
ρ: Density of sample (g/cm3)
M
3
ρ=(Unit: g/cm )M : Mass (g)V
V : Volume (cm3)3-2.

Specific Gravity

Specific gravity refers to the ratio of the density of a sample to the density of pure water at 4°C under apressure of 1013.25 hPa.
ρ: Density of sample (g/cm3)Mρ=(No unit)
M : Mass (g)V x ρ4
V : Volume (cm3)ρ4 : Density of water at 4°C(0.99997 g/cm3  1.000 g/cm3)

3-3.

Archimedes’ Principle Of Density Measurement

The GXA-14 is combined with an electronic balance to measure the density of a sample based on theArichimedes’ principle.
Arichimedes’ principle
A body immersed in a liquid (or a gas) is subject to an upward force equal to the weight of the liquid(or the gas) it displaces. The upward force is buoyancy.

3-4.

Density Of A Solid

The density of a solid can be obtained according to the weight of the sample in air, the weight of the sample inliquid and the density of the liquid.
ρ : Density of sample (g/cm3)Aρ=× (ρ0 - d) + d
A : Weight of sample in air (g)A-B
B : Weight of sample in liquid (g)ρ0 : Density of liquid (g/cm3)
d : Density of air (approx. 0.001 g/cm3)

3-5.

Density Of A Liquid

The density of a liquid can be obtained according to the weight of float in air, the weight of float in liquid and the
known volume of float.
ρ : Density of liquid (g/cm3)
A-B
ρ=
+d
A : Weight of float in air (g)V
B : Weight of float in liquid (g)V : Volume of float (cm3)d : Density of air (approx. 0.001 g/cm3)
5

4.

Error Factors

The results of measurements may be affected by various factors that could cause errors

4-1.

Buoyancy Of Air

A density measurement is influenced by an upward force of 0.0010 to 0.0014 g/cm3 (buoyancy of air).
The density of air can be obtained by the equation below:
d : Density of air (g/cm3)
0.0012932
Pd=
×t : Air temperature (°C)
1 + 0.0036728 × t
1013.25
P : Atmospheric pressure (hPa)
When measurement accuracy of three significant digits is necessary, consider the buoyancy of air, add 0.001
g/cm3 to the measured value to compensate for the error due to the air density.

4-2.

Volume Of Float

The tolerance of the measured value of the volume of the float is ±0.01 cm3.
In liquid density measurement, the decimal places beyond the third decimal place of the measured value
contain errors.
When measurement accuracy to the third decimal place or beyond is necessary, measure the volume of thefloat using distilled water.
V : Volume of float (cm3)A-B
V=- 0.0035
A : Mass of float in air (g)ρ-dB : Mass of float in liquid (g)ρ : Density of distilled water at t °C (g/cm3)
d : Density of air at t °C (g/cm3)
0.0035 : Correction value for the wire (diameter of 1 mm) of the density
pan connecting the upper and lower pans (when the beakerprovided with this kit is used)

4-3.

Temperature Of Liquid

The density of the liquid that is used for measuring the density of a solid varies with the liquid temperature.
Therefore, the decimal places beyond the second decimal place of the measured value contain errors.
Obtain the density of a liquid according to the temperature from Table 1 for distilled water or from otherreference documents for other liquids.
When measurement accuracy to the third decimal place or beyond is necessary, use a thermometer with atolerance of ±0.2 °C or less.

4-4.

Influence Of Wire

In solid density measurement, the surface of the liquid rises when a solid sample is placed on the density pan,which is immersed in the liquid. At this time, the buoyancy corresponding to the weight of the raised liquid isexerted on the wire (diameter of 1 mm) connecting the upper and lower density pans. If the surface of the liquidrises 1 mm, the buoyancy exerted on the wire is about 0.8 g/cm3. To minimize the error due to the buoyancy,
select a sample with a smaller volume or correct the value by calculation.
6

In liquid density measurement, a force (buoyancy) is exerted on the wire (diameter of 0.2 mm) suspending thefloat, when immersed in the liquid. Immersing the wire by 10 mm exerts a buoyancy of about 0.3 mg on thewire. However, this buoyancy influence can be ignored. When obtaining the liquid density, the difference
between the weight of the float in air and in water is divided by the volume of the float, as described in “3-5.
Density Of A Liquid”. This calculation reduces the error due to buoyancy such that it is negligible.

4-5.

Surface Tension

In solid density measurement, a force (surface tension) of about 5 mg is exerted on the pan between the wire
(diameter of 1 mm) of the density pan and the liquid surface.
The surface tension can be reduced by about 1 mg by adding a surfactant (for example, a wetting agent used
for developing photographs). Adding 0.1 mL (density: 1.2 g/cm3) of a surfactant to 200 mL of water will increase
the density of water by about 0.0001 g/cm3.
In liquid density measurement, a force (surface tension) of about 1 mg is exerted on the wire (diameter of 0.2mm) suspending the float. However, this surface tension influence can be ignored. When obtaining the liquiddensity, the difference between the weight of the float in air and in water is divided by the volume of the float, as
described in “6. Measuring The Density Of A Liquid”. This calculation reduces the error due to surface tension
such that it is negligible.

4-6.

Bubbles

The buoyancy of a bubble of 1 mm in diameter is about 0.5 mg. Bubble generation depends on the shape andmaterial of the sample, so take care when making measurements.
In solid density measurement, a surfactant may be added to reduce the influence of bubbles.

7

5.

Measuring The Density Of A Solid

Assemble the kit as described in the procedure below.

5-1.

Assembling The Kit

1. Remove the weighing pan and breeze break ringfrom the balance.

Step 4.
Thermometer clamp andThermometer

2. Place the density pan stand on the balance.
3. Place the beaker stand so that it does not touch
the density pan stand.
4. Attach the thermometer clamp to the beaker andinsert the thermometer into the thermometer clamp.

Step 1.
Weighing pan
Breeze break ring

Step 3.
Beaker stand

Step 5.
Beaker

5. Pour a liquid with a known density (such as distilledwater) into the beaker and place the beaker on the
beaker stand.
6. Place the density pan on the density pan stand.
7. Adjust the amount of the liquid so that the sample,
when placed on the lower pan (in the liquid), is about
10 mm below the surface of the liquid.
8. When the value displayed on the balance is stable,press the RE-ZERO key to set the displayed value
to zero. Now the balance is ready for density
measurement.
Step 6.
Density pan

GX-AE / GX-A / GF-A series balances are equippedwith a density mode to calculate the density of asolid. For details, refer to the instruction manual of
GX-AE / GX-A / GF-A series.

Step 2.
Density pan standGX-A series
for density measurement
8

5-2.

Measuring The Density Of A Solid

The density of a solid is obtained by averaging
the measured values.

key Sample in the air
Temperature

1. Start the measurement when water temperature
Step 2.
becomes stable.
2. Press the RE-ZEROvalue to zero.

key to set the displayed

The upper pan
The lower pan

Ex.: Display of GX-A
Step 3.
Value A

3. Place the sample on the upper pan in air andrecord the value A.
4. Press the RE-ZEROvalue to zero.

Approx. 10 mm
under liquid surface

key

key to set the displayed
Step 4.

5. Place the sample on the lower pan in liquid andStep 5.
record the value B.
Keep the depth of approximately 10 mm
Value B
under liquid surface.
Sample in the liquid
6. Obtain the density of water according to thetemperature. (Refer to Table 1)
Table 1 Density of distilled water
Temperature °C

+0

+1

+2

+3

+4

+5

+6

+7

+8

+9

0

0.99984

0.999900.99994

0.999960.99997

0.999960.99994

0.999900.999850.99978100.999700.999610.999490.999380.999240.999100.99894

0.99877

0.99860

0.9984120

0.998200.997990.99777

0.997540.99730

0.99704

0.99678

0.99651

0.99623

0.9959430

0.99565

0.99534

0.99503

0.99470

0.994370.99403

0.99368

0.99333

0.99297

0.9925940

0.992220.99183

0.99144

0.99104

0.990630.990210.98979

0.989360.98893

0.98849

At sea level (1 atmosphere), the density of water reaches maximum at 3.98 °C.
7. Use the following equations to obtain the density.
Three significant digits:
ρ : Density of sample (g/cm3)
A
ρ=
× ρ0
A : Value A : Weight of sample in air (g)A-B
B : Value B : Weight of sample in liquid (g)Four or more significant digits:
ρ0 : Density of liquid (g/cm3)Aρ=× (ρ0 - d) + d
d : Density of air (approx. 0.001 g/cm3)
A-B

9

Unit: g/cm3

Example of recording sheet
Value A : Weight of sample in air (g)4.8102 g

Value B : Weight of sample in liquid (g)4.2156 g

Temperature of liquid (°C)

26. °C

Density of liquid (g/cm3)
Weight of sample in air
ρ=× Density of liquid (g/cm3)
Weight of sample - Weight of sample
in airin liquid

0.99678 g/cm3
8.06 g/cm3(Calculated)

Value A : Weight of sample in air (g)4.8102 g

Value B : Weight of sample in liquid (g)4.2156 g

Temperature of liquid (°C)

26. °C

Density of liquid (g/cm3)

0.99678 g/cm3

Atmospheric pressure (hpa)1013 hpa

Density of air (g/cm3)
Weight of sample in air
ρ=× ( Density of liquid - Density of air ) + Density of air (g/cm3)
Weight of sample - Weight of sample
in airin liquid0.0012 g/cm3

108.055 g/cm3(Calculated)

6.

Measuring The Density Of A Liquid

Assemble the kit as described in the procedure below.

6-1.

Assembling The Kit:

1. For the procedure up to setting the beaker stand, refer to
Step 1 to Step 3 in “5-1. Assembling The Kit”.

The volume of the float is printed.
Ex:10.00 cm3Approx.

Step 4.

2. Attach the thermometer clamp to the beaker and insert thethermometer into the thermometer clamp.

30 mm

3. Place the beaker on the beaker stand.
Step 5.

4. Connect the float to the float hook using the wire.
The length of wire must be approx. 30 mm.
5. Hook the float hook on the density pan stand.
6. This completes the preparations before measurement.

6-2.

Example of the assembled GX-A series

Measuring The Density Of A Liquid

Use the following procedure to obtain the density of a liquid.
1. Press the RE-ZEROto zero.

Temperature

key to set the displayed value
Float in the air

2. Place the float, and then record its weight in the
air.
Let the measured value be A.

key

Step 1.
3. Pour the liquid of which you want to measure thedensity into the beaker.
Make sure that the float is about 10 mm below
Ex.: Display of GX-A
the surface of the liquid.
Step 4.
Value B

4. When the display stabilizes, and then record
its weight of the float in the liquid.
Let the measured value be B.

A-B
V

+d

ρ
A
V
d

Value A

Float in the liquid

Step 3.
Approx. 10 mm
under liquid surface

5. Use the following equations to obtain the densityof the liquid.

ρ=Step 2.

: Density of liquid (g/cm3): Weight of float in air – B : Weight of float in liquid (g): Volume of float (cm3): Density of air (approx. 0.001 g/cm3)
11

Example of recording sheet
Value A - B: Weight of float in air - Weight of float in liquid (g)9.9704 g

Temperature of liquid (°C)

25 °C

Volume of float (g/cm3)

10.01 cm3

Density of air (g/cm3)
Weight of float - Weight of float
in airin liquidρ=Volume of float

0.001 g/cm3+ Density of air (g/cm3)

120.997 g/cm3(Calculated)

7.

Density Measurement Using the GX-A / GF-A Balance

The GX-A / GF-A balances are equipped with a density function (specific gravity mode).
When this density determination kit GXA-14 is used with density function of the following balances, thedensity of a solid and liquid can be measured.
GX-124AE, GX-224AE, GX-324AE, GX-124A, GX-224A, GX-324A,
GF-124A, GF-224A, GF-324A

CautionThe density function () of the balance cannot be selected when using factory settings.

The density function of the balance does not display in the function table when the specific gravity (the weighing unit () is inactive. To use the specific gravity of the weighing unit, register"specific gravity" of "weighing unit" in the "function table" at first, and then select the specific gravity (of the weighing unit using the
When the liquid density input (

) of

MODE

)

key in weighing mode.

) is active, the liquid density input () or density of solid (displayed. Refer to the instruction manual of balance for operation method of the "function table".
The measurement value of density (specific gravity) is fixed to 4 decimal places.

13

) is

7-1.

Preparation Before Measurement (Settings of the Function Table）

Set the function table of the balance before the density function (specific gravity mode) is used.

Enabling the Unit of Specific Gravity (Register the specific gravity ()) of the weighing unit ().

The following is an example of registering units in the order from
Step

Description

1.

Press and hold (for about 2 seconds) the
scale is in weighing mode.

(grams) to(specific gravity).
Display and Key
Operation

SAMPLE

key while theof the function table is displayed.

Press and hold(for about 2 seconds)

2.

Press theunit

SAMPLE

key several times to display the weighing.
Press several times

3.

4.

Press thePRINT

key to display.

Press the RE-ZERO key to specify the unit and display the unit
specification mark “ ” .

14

Step
5.

Display and Key
Operation

Description

Press theSAMPLE

several times to display.
Press several times

6.

Press the RE-ZERO key to specify the unit and display the unit
specification mark “ ” .

7.

Press the8.

Press the CAL key to return to weighing display.

9.

Each time you press the MODE key, the units will switch in thespecified order.
Order fromto*.
* In the specific gravity mode, the unit iswhen calculating the density.

PRINT

The display unit is
top left and the “(

key to register the specified unit.

when measuring weight in air (shows at the” mark blinks) and when measuring weight in watershows at the top left, “” mark shows).

15

Selecting Substance ( Solid or Liquid )Select a substance which is either solid or liquid. It can be specified at "substance selection()" of "density function ()" in the function table.

Step

Description

10.

Press and hold (for about 2 seconds) the
scale is in weighing mode.

Display and Key
Operation
SAMPLE

key while theof the function table is displayed.

Press and hold(for about 2 seconds)

11.

Press theSAMPLE

function (key several times to display the “density)”.
Press several times

12.

Press thePRINT

key to enter the item.

16

Step
13.

Display and Key
Operation

Description
Select substance using the following keys.
SAMPLE

key

Used to select "substance selection (RE-ZERO)".

key

Selects either “solid density measurement (measurement (
)”.

14.

)” or “liquid density

Description of settings is as follows.
“Solid ()”
Proceeds to “7-2. Measuring Solid Density (Specific Gravity),
Function Table” after step 7.
“Liquid ()”
Proceeds to “7-4. Measuring Liquid Density (Specific Gravity),
Function Table” after step 7.

17

Selecting Input Method of Liquid Density Used for Solid Density Measurement (Specific
Gravity)
When measuring the density (specific gravity) of a liquid (function table()” setting is irrelevant, so proceed to step 17.

Step
15.

Display and Key
Operation

Description
The density of a liquid can be registered using the following keys.
SAMPLE

key

Used to select the “Liquid density input (RE-ZERO)”.

key

Specifies either “Density input of liquid using water temperature()” or “Direct density input of liquid (
)”.

16.

), the “liquid density input

Description of settings is as follows.
“Water temperature input ()”
Proceeds from step 7 of “7-2. Measuring Solid Density(Specific Gravity), Function Table” to “Method to Input
the Water Temperature ()” of “7-3. Specifying Liquid
Density”.
“Direct density input ()”
Proceeds from step 7 of “7-2. Measuring Solid Density(Specific Gravity), Function Table” to “Method to Input
the Density Directly ()” of “7-3. Specifying Liquid
Density”.

18

Step

Display and Key
Operation

Description

17.

Press thePRINT

key to register the settings.

18.

All preparations are complete.
Press the CAL key to enter the weighing mode to startmeasurement.

19.

Press the MODE key to display the specific gravity mode units.
Go to “7-2. Measuring Solid Density (Specific Gravity), Function
Table” or “7-4. Measuring Liquid Density (Specific Gravity),
Function Table”.

Measuring Solid Density()
orMeasuring Liquid Density()

Reference
The density function (specific gravity) uses "density function (
Class

Item

Parameter)" of the function table.
Description

Density input of a liquid using water temperatureDensity function(Specific gravity)

Liquid density input

Direct density input of a liquid
Density measurement of a solid

Substance selection

Density measurement of a liquid
indicates factory settings.

19

7-2.

Measuring Solid Density (Specific Gravity), Function Table

Cautions

When the temperature or type of liquid changes, register again the density of the liquid using "7-3.
Specifying Liquid Density".
The measurement value of the density function (specific gravity mode) is fixed to 4 decimal places. The
minimum division cannot be changed using the SAMPLE key.
The procedure of the density (specific gravity) measurement is to weigh the sample in air, to weigh thesample in liquid and to display calculated density of the sample.

Procedure
Step

Description

1.

Weighing mode for in air

Display and Key
Operation

Weighing
Operation

Preparation for measurement in air.
(shows andblinks )Press the RE-ZERO key to display zero withnothing is put on the upper pan and lower pan.
2.

Put the sample on the upper pan and wait until theweighing value is stable. If necessary, press the
PRINT key to output the weight of the sample.

Sample in the air

Example output: Weight in air
A&D standard format (factory setting)
Weighing data
outputis a space

3.

Press the SAMPLE key to record the weight in airand proceed to the weighing mode for in liquid(shows andshows ).

Cautions
The

SAMPLE

is overload

key is inactive when weighing value
.

20

Step

Display and Key
Operation

Description

4.

Weighing
Operation

Weighing mode for in liquid
Move the sample from the upper pan to lower pan.
(shows andshows ).

Adjust the amount of the liquid so that sample isapproximately 10 mm under the liquid surface when
the sample is put on lower pan in the liquid.

Sample in theliquidApprox. 10 mm
under liquid surface

Sample in the liquid
5.

Press thePRINT

key to output the weighing value.

Example output: Weight in air
A&D standard format (factory setting)is a space
Weighing data
output6.

Press the SAMPLE key to record the weight in theliquid and proceed to the liquid density input mode(shows andshows).

Cautions
The

SAMPLE

is overload

key is inactive when weighing value
.

21

Step
7.

Display and Key
Operation

Description

Liquid density input mode
Input the density of the liquid.
Refer to “Method to Input the Water Temperature()” (page 23) or “Method to Input the Density
Directly ()” (page 24) in “7-3. Specifying
Liquid Density”.

Input the watertemperature()
orSample in theliquidInput the density
directly()

8.

Press thePRINT

display of a solid. (9.

key to proceed to the density
shows andshows)

Solid density display mode
If necessary, while the density of the sample isdisplayed, press the PRINT key to output the density.
The unit of density (specific gravity) is.
Example output: Density (specific gravity)
A&D standard format (factory setting)

Weighing data
outputis a space
10.

If another sample is to be measured, press the
SAMPLE key and proceed to step 1 of “Weighing
mode for in air” (

11.

12.

Weighing
Operationshows andblinks ).

When the temperature or type of a liquid being
measured changes, if necessary, register again thedensity of the liquid according to step 7 of “Liquiddensity input mode”.

If the MODE key is pressed, the display is changes
to another weighing mode.
22

Refer to“Liquid density inputmode” instep 7.

7-3.

Specifying Liquid Density

Select the density input method of a liquid when the solid density is measured.
The “liquid density input ()" has “Method To Input The Water Temperature (“Method To Input The Density Directly ()” (page 23) and)” (page 24).

Method To Input The Water Temperature ()

This step is an additional explanation of step 7 “Liquid density input mode” (page 22).
The current setting of water temperature is displayed. (Factory setting is 25.0 °C.)
Refer to Table1 in “5-2. Measuring The Density Of A Solid” regarding the relation between temperature anddensity of water.
Register the water temperature using the following keys.
The setting range of temperature is 0.0 to 99.9 °C in 0.1 °C interval.

Step
1.

Display and Key
Operation

Description
RE-ZERO key
Increases number of blinking digit. (+ key)
(Number next 9 is 0.)

MODE

key

Decreases number of blinking digit. (- key)
(Number next 0 is 9.)

SAMPLE key
Moves blinking digit.

23

Step
1.

Display and Key
Operation

Description
PRINT key
Stores the current setting and proceeds to the density display.
(Go to Step 9. “Solid density display mode”) (page 22)

CAL key
Cancels the setting and proceeds to the density display.
(Go to Step 9. “Solid density display mode”) (page 22)

Method To Input The Density Directly ()

This step is an additional explanation of step 7 “Liquid density input mode” (page 22).
The current setting of density of water is displayed. (Factory setting is 1.0000 g/cm3.)
Register density of water using the following keys.
The setting range of density is 0.0000 to 1.9999 g/cm3.
If the input becomes out of range, the balance displays

Step
1.

and returns to the input display.

Display and Key
Operation

Description
RE-ZERO key
Increases number of blinking digit. (+ key)
(Number next 9 is 0.)

24

Step
1.

Display and Key
Operation

Description
MODE

key

Decreases number of blinking digit. (- key)
(Number next 0 is 9.)

SAMPLE key
Moves blinking digit.

PRINT key
Stores the current setting and proceeds to the density display.
(Go to Step 9. “Solid density display mode”) (page 22)

CAL key
Cancels the setting and proceeds to the density display.
(Go to Step 9. “Solid density display mode”) (page 22)

25

7-4.

Measuring Liquid Density (Specific Gravity), Function Table

The measurement value of density (specific gravity) is fixed to 4 decimal places. Minimum division cannot bechanged using the SAMPLE key. The procedure of the density (specific gravity) measurement is to weighthe float in air, to weigh the float in liquid and to display calculated density of the float. Each status andindications are as follows :Procedure
Step

Description

1.

Weighing mode for in air

Display and Key
Operation

Weighing
Operation

Preparation for a measurement in air.
(shows ,

blinks )Press the RE-ZERO key to display zero withnothing placed on the density pan stand.
2.

Put the float on the upper pan and wait until theweighing value is stable. If necessary, press the
PRINT key to output the weight of the sample..
Example output: Weight in air
A&D standard format (factory setting)
Weighing data
outputis a space

3.

Press the SAMPLE key to record weight in air andproceed to the weighing mode for liquid(shows andshows ).

Cautions
The

SAMPLE

is overload

key is inactive when weighing value.

26

Float in the air

Step

Display and Key

Description

4.

Operation

Weighing
Operation

Weighing mode for in liquid
To measure the density of the liquid, pour it into thebeaker and sink the float. (shows,

shows ).

Adjust the amount of the liquid so that the float is
approximately 10 mm under the liquid surface when
float is hung in the liquid.

Float in the liquid

Approx. 10 mm
under liquid surface

Float in the liquid5.

Wait until the weighing value is stable. To output theweighing value, press the PRINT key.
Example output: Weight in liquid
A&D standard format (factory setting)is a space

6.

Weighing data
outputPress the SAMPLE key to record the weight in theliquid and proceed to the float volume input mode(shows andshows ).

Cautions
The

SAMPLE

is overload
7.

Volume input mode
key is inactive when weighing value.

Float volume input mode
Input the volume of the float.
Refer to “7-5. Specifying Volume of Float” and input thevolume of the float.

27

Refer to “7-5.
Specifying Volumeof Float”.

Step
8.

Press thePRINT

display (9.

Display and Key

Description

Operation

key to proceed to the density

shows andshows ).

Float in the liquid

Liquid density display mode
If necessary, while the calculated density of the liquid
is displayed, press the PRINT key to output thedensity.
The unit of density (specific gravity) is.
Weighing data
outputExample output: density (specific gravity)
A&D standard format (factory setting)is a space
10.

If another sample is to be measured, press the
SAMPLE key and proceed to step 1 of “Weighing
mode for in air” (11.

Weighing
Operationshows andblinks ).

If the MODE key is pressed, the display is changes
to another weighing mode.

28

7-5.

Specifying Volume of Float

This step is an additional explanation of step 7 “Float volume input mode” (page 27).
The current volume of the float is displayed. (Factory setting is 10.00 cm3.)
Register the volume using the following keys.
The setting range of volume is 0.01 to 99.99 cm3 in 0.01 cm3 interval.
Step1.

Display and Key
Operation

Description
RE-ZERO key
Increases number of a blinking digit. (+ key)
(Number next 9 is 0.)

MODE

key

Decreases number of a blinking digit. (- key)
(Number next 0 is 9.)

SAMPLE key
Moves a blinking digit.

PRINT key
Stores the current setting and proceeds to the density display.
(Go to Step 9. “Liquid density display mode”) (page 28.)

29

Step
1.

Display and Key
Operation

Description
CAL key
Cancels the setting and proceeds to the density display.
(Go to Step 9. “Liquid density display mode”) (page 28.)30

8. Frequently Asked Questions
Questions

Answers

Use a liquid that has a lower density than water and does not
I’d like to measure the density of a resin pellet dissolve the sample, such as methanol (density 0.798) oror sheet, which floats in water. Is it possible? kerosene (density 0.80). The density of the liquid used ismeasured using the float provided with the kit.
Can a sample containing bubbles bemeasured?

The density of a sample with bubbles can be measured as it is.
But as time passes, the bubbles disappear and the apparent
density may change. A sample that floats in water due to the low
density can not be measured.

The measurement repeatability may beaffected by the water’s surface tension. What
can I do about this?

A few drops of a surfactant (for example, a mild detergent forwashing dishes) added to the water reduce the influence of
surface tension. A few drops of a surfactant will affect the liquiddensity only a very small amount. When methanol is used in placeof water, the influence of surface tension is small, even without asurfactant.

When tap water is used, bubbles are gradually Tap water contains dissolved gases such as oxygen and carbon
dioxide. When tap water is used, the released dissolved gases
generated on the sample surface and agenerate bubbles. It is recommended that pure water or distilled
measurement error occurs. What can I dowater, which contains few dissolved gases, be used.
about this?
When I try to measure a highly water- repellent Before measurement, soak the sample in the water with anmaterial such as rubber, bubbles stick to the appropriate amount of surfactant added. Doing this increases the
sample surface hydrophilicity and makes it more difficult for
sample. What can I do about this?
bubbles to stick to the sample surface.
Up to what size of sample can be measured?

In consideration of the density pan size, the maximum sample sizethat can be measured is:Diameter 25 mm,
Height 30 mm,

Can I measure the density of a liquid with ahigh viscosity?

A liquid with a viscosity up to 500 mPa·s can be measured. If theviscosity exceeds this value, the float takes excessive time to sink
and a measurement error occurs. Measuring adhesive is notrecommended because the adhesive sample may be difficult toremove from the float.

Does using a semi-micro balance improveaccuracy?

The effects of surface tension cause errors in the measurement
value of around 0.2 to 1.0 mg. In measurement using the 0.1 mg
range, the magnitude of error and the level of balance accuracy
are almost the same. In measurement using the 0.01 mg range,
the magnitude of error greatly exceeds the level of balance
accuracy, so using a semi-micro balance is not recommended.

31

9. Water Resistant Digital Thermometer AD-5625
9-1.

For Safe Use

Please take the following precautions when operating this device.
- RepairOpening the case to attempt repair of the device should not be done by anyone other than designated repair staff.
Doing so will not only void the warranty, but also may result in mechanical error or loss of functionality.
- Error in the device
When an error has been found in the device, stop using it immediately and attach a label indicating the device is “Faulty” orstore it in a location where it will not be used inadvertently. Continuing to use the device without proper repair could be highly
dangerous. Please contact A&D or the authorized dealer in your area for advice on repair of the device.

9-2.

Precautions When Handling- After using the device for measuring very high (50°C or higher) or low (0°C or lower) temperatures, the probe should not be
handled until it has returned to a normal temperature range. Doing so may result in burning or other damage to skin.
- The sheath (metal part) of the probe can be used for temperatures up to 260°C, but the plastic display section
should only be used in temperatures up to 60°C. Please ensure the display section is not exposed totemperatures exceeding this. Doing so may result in mechanical error or deformation.
- Please note that the end of the sheath is sharp, so may cause harm to people or objects. When being carried or
not in use, please keep in the sheath holder.
- Please ensure the device is not subject to severe impacts, vibrations or electric shocks. This may result inmechanical error.
- Do not use the device in direct sunlight for a prolonged period of time, in an unventilated vehicle or close to aheat source. The operating temperature range for the device is 0 to 40°C. Use outside this temperature range
may lead to mechanical error.
- Do not use the device in an area which may be subject to sudden rises in temperature, high levels of humidity ora lot of dust.
- The device has a waterproof design, however it is best not to place it in water or leave it for a long time in anarea where it may become wet.
- The waterproof performance of the device conforms to protection level 7 of JIS C 0920 and can be submerged instill water at a depth of up to 1 meter for 30 minutes.
- If the battery is nearly consumed, there may be difficulties operating the device properly or obtaining a value on the display. In
this case, please exchange the battery with a new one following the procedure detailed in “8-4. Replacing The Battery”.
- Using the device in a location with a strong magnetic or electric field (near a television, IH cooker, microwave
oven, etc.), may impact on its performance. Please try to avoid measurement in such locations.
- To prevent hazard, please do not use the device in a location near flammable gas.
32

9-3.

Each Part Name
LCD

Battery cover[ON/OFF] button[AUTO OFF] button[MAX/MINI] button

Sheath holder

SheathMaterial: Main body, battery cover: ABS
Button: Rubber
Display: PC
Sheath: SUS304
Sheath holder: PC
Sheath holder fitting: Iron (Nickel plating)

Display
Auto power off function

Maximum value display
Minimum value display

Measurement temperature display

Low battery indicator(Maximum value /Minimum value display)

Error displayloHiAppears when the measurement temperature is below the lower limit for the display range, or there
is an error in the temperature sensor or internal circuit.
Appears when the measurement temperature exceeds the upper limit for the display range, or there
is an error in the temperature sensor or internal circuit.

33

9-4.

Replacing The Battery

The battery has not been installed in the device when purchasing this device. Properly install the battery in thedevice by the following procedure.
Also, when the “” appears at the bottom right on the display, replace the old battery with new one by thefollowing procedure.
* Purchase the battery at your local convenience store, supermarket, home center or electrical store.
* When the main body is damp, wipe the moisture fully and exchange the battery.
The device may be damaged if water gets inside.

Replacing the battery(1) Turn the battery cover on the rear side of the main body in counter clockwise direction by using a coin, andremove the battery cover from the device.
(2) Remove the old battery from the device.
(3) Put a new CR2032 coin type lithium battery with the + side of the battery facing outward in the device.
(4) Put the battery cover back on the device.
As shown in the figure below, put the battery cover so that the upper mark on the main body and the mark on
the battery cover join together, and turn the battery cover in clockwise direction using a coin until the mark on
the battery cover joins the lower mark on the main body.
The battery cover not secured properly may result in water entering and damaging the device.

OP
EN

CL
OS
E

CLOSE
OPEN

CAUTION
Precautions on the battery use- The provided battery is for monitoring purpose, and its life may therefore be shorter than the battery life
specified in this manual.
- Remove the battery from the device and keep it elsewhere when you are not using the device for a long
period of time,- Be sure the specified battery (CR2032 coin type lithium battery 1pc) is used.
- Mind the direction for polarity. Reverse polarity may not only cause operation errors but also damage
the device.
- The battery should not be recharged, short-circuited, disassembled, or thrown into the fire, Such action
may cause a burst or leak of liquid of the battery.
- Keep the battery out of children’s reach. Talk to a doctor immediately in case a child swallowed thebattery.
- For environmental protection, dispose of a spent battery by following your local regulations.

34

9-5.

Operating the Thermometer

Measuring the temperature(1) Press the [ON/OFF] button to turn the power on.
(2) Remove the sheath holder when it is attached to the sheath.
(3) Measure the temperature by one of the following methods depending on the material to be measured.

When measuring the liquid
Immerse the sensor into the position where you would like to measure thetemperature.
When there is steam arising from the liquid, handle the device so that thedisplay is not exposed to the steam. Otherwise the steam may damage thedevice.

When measuring the semisolid material
Stick the sensor to the depth where you would like to measure thetemperature in the material.
Attempting to forcibly stick the sensor into the material when the measurement
material is too solid may damage the sheath. In such case, a device thatenables smooth insertion of the sensor is required.

When measuring the gas
Place the sensor in the location where you would like to measure the temperature and wait until the display
becomes stable.
When measuring a high temperature atmosphere such as steam, use a shield to protect the display from hightemperature.
Gas

Shield35

CAUTION
The device detects a temperature at the tip of the sheath.
To protect the device from damage, handle the device so that the part other than the sheath is not
exposed to high or low temperature of the substance to be measured.
SheathTemperature detection part

Using the maximum and minimum temperature memory
The device can automatically store the maximum and minimum
temperature measured after the battery was installed in thedevice (Or for after the memory was reset).

Currently
measuredtemperature
Press the[MAX/MIN] button
Maximum
temperature
display

Press the [MAX/MIN]
buttonMinimum
temperature
display

Press the [MAX/MIN]
buttonThe device automatically displays the current measurement temperature if no operation is made for 30 seconds
while on the maximum or minimum temperature display
To check the maximum and minimum temperatures for a new measurement, reset the memory before starting themeasurement by following the “Resetting the maximum and minimum temperature memory” described below.

CAUTION
The maximum and minimum temperatures memorized in the device are reset automatically when thebattery was removed from the device.

36

Resetting the maximum and minimum temperature memory
Reset the maximum and minimum temperature memory as follows:
Press the [MAX/MIN] button to display the maximum or minimum temperature. Press the [MAX/MIN] button again
and hold it for more than two seconds. The display goes into the bar display, and the stored the maximum andminimum temperatures are reset to store new maximum and minimum℃ ＭAX
temperatures.
.

About the auto power off function and turning the power off(1) Auto power off function
The device has the auto power off function.
The auto power off function is disabled when the battery has been replaced.
To enable the auto power off function, press the [AUTO OFF] button one time. The “AUTO” appears at the upper
right on the display to show that auto power off function is now enables. With the auto power off function, thedevice automatically turns the power off when no operation is made for about five minutes. To disable the auto
power off function, press the [AUTO OFF] button again.
The “AUTO” at the upper right on the display disappears,℃ AUTOand the auto power off function becomes disabled.

(2) Turning the power off
Press the [ON/OFF] button when you would like to turn the power off immediately.

How to use the sheath holder
Use the sheath holder to protect the sheath when you carry the device.
Be sure the sheath holder is removed from sheath when performing measurements.
In order to prevent the sheath holder from bring deformed or damaged, let the sheath return to the room
temperature before putting the sheath holder on after performing high or low temperature measurements.

37

9-6.

Daily Care

Accurate measurements can not be made if the temperature detection part is dirty. It should be kept clean when
performing measurements.
Avoid rubbing it when the main body is dirty. Instead, rinse the dirt off using water.
When the dirt is heavy, wipe it off gently using a kitchen sponge, etc., dampened with ph-neutral detergent.
Do not use abrasives or volatile solvents such as thinner or benzine, etc.

9-7.

Specifications

Sensor: Thermistor

Temperature measurement range: -40.0℃ to +260.0℃

Display resolution: 0.1℃

Measurement accuracy: ±1.0℃ (-9.9 to 59.9℃)±2.0℃(-19.9 to -10.0℃, 60.0 to 99.9℃)±3.0℃(-29.9 to -20.0℃, 100.0 to 199.9℃)±4.0℃(-40.0 to -30.0℃, 200.0 to 260.0℃)

Display refreshment interval: Every one second

Waterproof level: JIS IPX7 (Waterproof for 30 minutes at a water depth of 1 meter, still water at room
temperature)

Power supply: CR2032 x 1 pc

Battery life

: Approx.1 year (When used for one hour per day)Operating temperature and humidity : 0 to 40℃, 75%RH or less
(No condensation) (Excluding the sheath)
Storage temperature and humidity：0 to 50℃, 75%RH or less
(No condensation)

External dimension of the sheath: Φ2.8mm (The tip is Φ2.2mm, the length is 20 mm),Approx. 120mm

External dimension: 40(W) x 187(H) x 17(D) mm (The protrusion is not included.)

Weight: Approx. 27g (The battery and sheath holder is included.)Standard accessory: Instruction manual, sheath holder, battery (For monitor battery)38

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