Electrothermal IA 9200 Quick guide

IA9000 SERIES
Digital Melting Point
Apparatus
Operating and
Safety Instructions

2
PAGE
1. INTRODUCTION……………………………………………………
3
2. SAFETY INFORMATION…………………………………………..
4
3. INSTALATION INFORMATION……………………………………
5
4. PRINCIPALS OF OPERATION……………………………………
6
4.1 CALIBRATION…………………………………………..
8
4.2 IA 9100 OPERATION……………………………………
10
4.3 IA 9200 OPERATION……………………………………
15
4.4 IA9300 OPERATION……………………………………
22
5. TECHNICAL SPECIFICATION……………………………………
23
6. EQUIPMENT MAINTENANCE……………………………………
25
7. SERVICE INFORMATION…………………………………………
26
APPENDIX A…………………………………………………..
27
APPENDIX B………………………………………………….
28
APPENDIX C…………………………………………………
29
EC Declaration of Conformity…………………………………….
32

3
Electrothermal IA9000 Series of Digital melting Point Instruments are designed
for general purpose laboratory use, in which samples submitted for analysis are
enclosed in glass capillary tubes and brought to a melt point condition under
strictly controlled parameters of time and temperature.
All instruments in the product range operate in a similar manner with a
microprocessor controlling the oven temperature and the readout. All versions
of the IA contain an onboard memory for control and storage of the results.
Melt temperatures can be recorded by simple key depressions that will transfer
the display information into the memory at specified phases of melt.
Alternatively critical point temperatures may be set up for recording data. After
recording the melt point, the oven temperature will revert to the „set – point‟
allowing consecutive samples to be analysed using identical control
parameters.
The advanced IA9200 and IA9300 models have additional advanced features
to permit computer assisted data analysis.
Start ramp temperature and ramp rate can be keyboard selected for
different test standards.
The operating system permits batch serial numbers to be allocated
from the keyboard.
An RS232-C interface enables the information to be transferred directly
to a computer.
An optional serial/parallel printer enables a hard copy of temperatures,
date, time and batch number to be recorded in association with a built
in „real time‟ clock.
Warnings ( * ) given in the publication identify conditions and actions that pose
hazards to the end user. It is therefore recommended that a person designated
as the „Responsible Body‟ for the equipment follow the Operating Instructions
and safety Information and that the end user(s) are suitably trained before
using the equipment.
Les avertissements ( * ) qui figurent dans ce manuel d’instructions signalent
des situations et actions qui pr é sentent un risqué pour I’utilisatur.
Il est donc recommand é que I’autorité responsible de I’équipment lise ce
manuel, ainsi que les consigne de sécurité, et que le les utilisaturs reçoivent
une formation appropiée avant d’utiliser I’équipement.

4
This product has been designed for safe operation
when in normal use and when used and operated
in accordance with the manufactures instructions.
This equipment is classified as Class O (IEC519:
part 2) with regard to over temperature protection
and should be used accordingly.
WARNING
* Always follow good laboratory practice when
using the equipment and give due recognition
to your company‟s safety procedures and the
applicable health and safety associated
legislation applicable to your area of
operation. Check laboratory procedures for
substances being heated to ensure that any
hazards (e.g. explosion, implosion or the
release of toxic or flammable gases) that
might arise, have been addressed before
proceeding.
* When heating certain substances, the
liberation of hazardous gases may require a
fume cupboard or other extraction system.
* Ensure the equipment is used on clean, dry
non-combustible work surface with suitable
clearance from other equipment.
* Do not lean or stretch over the equipment,
glass capillary tubes protruding from the top
could be broken or cause injury.
* The equipment is not spark or explosion proof
and has not been designed for use in
hazardous areas in terms of BS5345. Keep
flammable, low flash point substances away
from the equipment.
* Do not spill substance onto the equipment. If
spillage should occur, disconnect the unit from
the mains supply and follow the instructions
detailed in section 6 „Equipment Maintenance.
* Place used capillary tubes into a suitable
container and dispose of them in a safe and
appropriate manner.
NOTE. Failure to use this product in accordance
with the manufacture‟s Operating Instructions may
compromise the basic safety protection afforded by
the equipment . This may invalidate any warranty /
guarantee‟s afforded by the manufacture or agents
of the manufacture both in the UK and abroad as
seen fit by the manufacture.
AVERTISSEMENT
* Cet équipment appartient å la Classe O (IEC519:
Partie 2) en ce qui trait å la protection contre la
surchauffe et doit étre utilise en consequence.
* Veuillez adopter de bonnes pratiques de travail en
laboratoire lors de l’utilisation de l’ equipment et
préter tiute l’attention nécessaire aux consignes de
sécurite de votre enterprise et réglements en
matiére de santé et de sécurité qui sont en vigueul
dansa al zone d’explosion. Consultez les régles de
laboratoire portant sur les substance chauffées afin
de vous assurer que las risques éventuels
(explosion, dégagement de vapeurs toxiques ou
inflammables) aient reçu toute L’attention requise
avant de commencer les travaux. Lors du
chauffage de certain substance, la liberation de
gaz dangereuxpeut nécessiter I’utilisation d’une
hotte de laboratoire ou de pispositifs de ventilation.
* Assurez-vous que I’équipment est utilisésur une
surface de travail proper, séche et incombust, de
même qu’à une distance suffisante des autres
appareils.
* Ne touchez jamais à I’élment chaffant ou recipient
pendant I’utilisation.
* Ĕvitez de vous pencher ou de I’équimpnent, au
risqué de casser certaines pieces ou accessoires
de verrerie sortant du dessus de I’appereil et de
vous blesser.
* Cet équipmnt n’est ni à I’épreuve des étincelles,
des flames ou des explosions et n’est pas conçu
pour servir dans des zones dangereuses, telles
que définies selon la norme BS5345. Ĕloignez de
I’appareil toute substance inflammable ou á faible
point d d’éclair.
* Ne versez aucune sur le boîtier. En cas de
déversement, coupez I’alimentation principale de
I’appareil et suivez les instructions d’entretien.
* Ne courverz pas le boîtier pendant I’utilisation et ne
laissez pas I’appereil en marche s’il ne contient
aucun flacon rempli.
* N’appliquez pas d’isolant thermiquw ser le du
flacon exposê. Cet isolant risqué d’obstruer les
fentes de refroidissement par convection disposes
au bord du boîtier, ce qui le feraint surchauffer.
* Il set toujours dêconseillê de laisser un appareil
chauffant sans surveillance pendant son
fonctionnement. Cette rêgle s’applique êgalement
à cet êquipement.
* N’utilisez que les pieces de rechange et les
accessories appropriês, tel qu’indiquê au chaptire
6.
* Ne retirez pas la cartouche de chauffage de
I’appareil si le contrôleur est sous tension.
This symbol means
the user must refer
to the Operating
Instructions

5
INSTALLATION INSTRUCTIONS: The equipment is Installation category (Over
Voltage category) Class II with regard to protection against electric shock (IEC
664 Sub Clause 5.6).
Environment operation conditions: indoor use only; temperatures 5°C to 40°C,
80% RH maximum; mains supply voltage fluctuations not to exceed 10%.
The equipment power supply unit must be connected to a fixed ground earthed
(grounded) mains socket outlet. If the unit is supplied without a fitted mains
plug the following connections must be made. (If in doubt consult a qualified
Electrician).
Green / Yellow or Green
=
Protected earth (ground)
Blue or White
=
Neutral (Negative) (-)
Brown or Black
=
Line (Live –positive) (+)
This equipment is supplied with a universal input voltage power supply. Only
use the power supply with the equipment supplied. Only use the equipment
with the supplied power supply unit.
For additional safety it is recommended the unit be connected inline to a RCD
(Residual Current Device) or GFI (Ground fault interrupter) in the U.S.A.
Environmental Protection
It is the policy of Electrothermal to give consideration to environmental issues
in design and manufacturing without compromising end product performance
and value.
Packaging materials have been selected such that they may be assorted
for recycling. Main case Materials are moulded in ABS plastic.
At the end of your product and accessories life, it must not be discarded
as domestic waste. Ref: EU Directive 2002/96/EC on Waste Electrical and
Electronic Equipment Directive (WEEE). Please contact your distributor /
supplier for further information. For end users outside of the EU consult
applicable regulations.
The IA9200 & IA9300 products contain Nickel Metal Hydride batteries (NI MH).
Battery replacement should only be performed by the manufacture or service
agent acting on behalf of the manufacturer.
End of life battery removal should also only be performed by an authorised
recycling company. Battery removal will cause loss of memory data. Battery
removal invalidates manufacturer‟s warranty.
End of Life battery removal: Remove base and unsolder the NI MH battery from
the PCBA. Always dispose of batteries in an environmentally friendly manner
This product should only be dismantled for recycling by an authorised recycling
company.
Electrothermal is registered as Electrothermal Engineering Limited with the Environment Agency as
a producer of WEEE through an authorised compliance scheme.

6
During operation the various parameters of the sample analysis are shown on
the liquid crystal display, and all the stages of the process are indicated by the
L.E.D. illumination or audible warning. The principles of the operation are as
follows:-
Guided by knowledge of the expected melting temperatures of the
sample, a „Set Point‟ is established and its value keyed in (see figure
1).
The oven temperature is driven to meet the „Set Point‟ at maximum
rate.
After a short delay for the over temperature to stabilise at the „Set
Point‟, the ramp is established and selected.
The temperature now increases linearly at the much slower ramp rate,
during which time the melt analysis takes place.
The melting of the sample is observed and the temperatures registered
in the memory at the appropriate time.
The temperatures (and for the IA9200 also the measuring parameters)
are now available for review on the display (and for the IA9300 & 9200
a hard copy recorded to be printed).
The oven temperature may now be directed to a new „Set Point‟ if
required for the next analysis.

7
Preparation of Samples
To obtained the best results, the samples under test / observation should be
perfectly dry. Drying is best accomplished by storing the samples overnight in a
vacuum desiccator over a suitable drying agent such as phosphourus
pentoxide. A drying method must be employed in the case of hygroscopic
samples.
Provided the sample is dry there is usually little difficulty in introducing the
small amount required into the capillary tube. Tapping the tube on the bench to
compact the material at the base of the tube. It is important not to use too large
a sample, a quantity occupying no more than 1-2 mm of the bottom of the tube
should be used. If this is exceeded, accurate and sharp melting point may not
be obtained. Care should be taken to see the sample beds down to the bottom
of the tube, as large are pockets can cause difficulty.
Determination of Melting point.
In recording melting points, the operator may wish to observe four distinct
phases:
a) First signs of change (darkening, shrivelling, sintering, etc). These changes
may be due to loss of solvent or crystallization. Occasionally one can see
the solvent condensing on the cooler portion of the tube.
b) First signs of liquid formation.
c) Formation of meniscus.
d) Formation of a completely clear liquid.
Not all compounds will behave in this manner however. With many, especially
where the material is in a high state of purity, no change may be seen before
any liquid appears. Some materials will be seen to sublime, rather than melt
above 300°C
Decomposition may often be accompanied by evolution of gas.
Pure compounds will be expected to pass through the 3 stages a) c) and d),
within a range of 1°C.
Interpretation of Results.
It is generally accepted the formation of a meniscus should be regarded as the
figure to be recorded for a single temperature melting point. Where a range is
quoted, it can generally be assumed reference is being made to stages b) to d)
inclusive. The range will generally cover no more than 1°C for pure
compounds, but may well extend to 3 to 4°C for others. The range will often be
greater when decomposition or sublimation is experienced. When using the
equipment to determine the melting point of more than one sample of the same
compound at a time, the average of the meniscus temperature (onset of melt)
should be taken.
Calibration Procedure.
For equipment calibration purposes and to minimise variation between repeat
measurements, it is recommended that onset of melt observations are used
against Certified Reference Material stated onset figures.
The measurements should be taken using 2mm diameter capillary tubes.

8
Calibration must be carried out annually, or whenever the performance of the
apparatus is suspected e.g. when similar successive test produce markedly
divergent results.
The apparatus must either be returned to the dealer for calibration, or
calibration must be carried out in the following manner, using Calibration Kit
AZ6730 and the standard chemicals Carbazole (AZ9118) and P-nitrotoluene
(AZ9218).
To check if the unit is still in calibration proceed as follows:-
a) Switch the unit on and ensure the instrument components are in the
stable condition as described in Section 4 or 18.
b) Perform a melt with each standard chemicals and note the reading.
c) Compare the results obtained with the melting points shown on the
certificates supplied with each chemical and ascertain whether the unit
performs within acceptable limits.
d) If it is decided that re-calibration is required proceed as follows:-
1. Switch off the unit and allow it to cool.
2. Disconnect Power supply from the rear of the unit.
3. Invert the unit and remove the three screws securing the base
plate to the body.
4. Place the unit on the bench the correct way up taking care not to
let the base fall from the unit. Lift the body from the base plate.
5. Turn the body on its side and placed it on the bench to the right of
the base plate.
6. Remove the two pin connector from PL1 2A on the printed circuit
board.
7. Plug in the calibration box into pin connector PL 12A.
8. Switch the selector switch to the LO position.
9. Insert the power plug on the instrument and switch on.
10. Allow the instrument to re-stabilise. It should not be necessary to
go through the „Set-point‟ procedure again at this stage. 2 to 3
minutes should suffice to ensure stabilisation.
11. Adjust the LO knob until the display shows the actual melting point
obtained in b) above for the standard sample of p-nitrotoluene.

9
12. Switch the selector switch to the Hi position.
13. Adjust the HI knob until the display shows the actual melting point
obtained in b) above for the standard sample of Carbazole
14. Adjust VR1 on the PCB with the trim tool provided untilt the display
reads the melting point o Carbazole as quoted on the Calibration
Certificate provided with the sample.
15. Switch the selector switch to LO.
16. Adjust VR3 on the PCB with eth trim tool until the display reads the
melting point of p-nitrotoluene as quoted on the Calibration
Certificate provided with the sample.
17. Repeat steps 14 to 18 until no further adjustment to VR1 and VR3
are required when the switch is changed from Hi to LO.
18. The unit is now calibrated.
19. Unplug the calibration Box PL12A and replace the connector
removed in stage 6.
20. Remove the power supply plug and replace the base. Check the
calibration again using Standard Chemicals as in b) and c) and
repeat the procedure if necessary.

10
Upon receipt of the instrument proceed consecutively as follows:-
4.2.1 Power Supply.
The power supply supplied with your new IA 9100 supports all A.C.
Mains supply voltages within the range of 100V to 240V inclusive at
50-60Hz. Do not use the power supply with a D.C. supply voltage or in
conjunction with any type of voltage regulation equipment. Do not use
with a mains supply supplying power at a different frequency other than
that stated.
4.2.2 Set-Up
N.B. DO NOT ATTEMPT TO MOVE ADJUSTMENT ARM BEFORE
RELEASING CLAMP SCREWS. (See Figure 2).
After releasing the clamp screws, adjust the angle and extension of the
arm, and rotate the oven head if required in order to establish the most
comfortable viewing position; re-tighten screws.
Do not over tighten.

11
4.2.3 Connections.
a) Insert the jack connection Plug from the Power Supply Unit
into the instrument supply socket.
b) Connect the Power Supply mains cable to the Power Supply
Unit.
c) Plug the Mains power supply cable into the supply outlet.
4.2.4 Start up.
Switch the power on.
Observe all indicator lights flash momentarily and then the display rolls
from 9999 to 0000 and settles at the oven ambient temperature.
NOTE: In order to attain maximum accuracy from the unit it is
important to allow all components to stabilise at their working
temperature. It is recommended therefore that the unit is switched on
for 30 minutes before use.
Alternatively the unit may be switched on overnight at ambient
temperature. The bulb will supply sufficient heat to maintain stability.
The insulation material of the oven may absorb small amounts of
moisture if left un-powered for any length of time (dependant upon
ambient conditions). It is suggested the oven is heated up to a
temperature of 400 C before use as described in sections 4.2.6 and
4.2.7, with the removed, and then allowed to cool, switching the oven
off as in section 4.12.13 before replacing the lens.

12
4.2.5
Prepare a Sample
Up to three samples may be accommodated in the tube
guide. To prepare a sample proceed as follows:
Break a new capillary tube in half and insert the powdered
sample in the tube. The quantity should be such that the
height dose no exceed 1mm.
Locate the sample in the tube guide. It is recommended
that three tubes are inserted even if each tube dose not
contain a sample.
4.2.6
Enter the ‘set Point’
(This should be 2 to 5 C below the expected melt point).
Proceed as follows (a figure of 107 C is given as an example):-
Press arrow UP key eleven times (value 10 C per keystroke) to
set a temperature of 110 C.
Press the arrow DOWN key three times (value –1 C per key
stroke) to reduce the „set-point‟ to 107 C.
If an error is made, press the CLEAR key and recommence
entering the set point.
4.2.7
GOTO ‘Set Point’
Press GOTO key.
The four bar L.E.D‟s will illuminate consecutively as the
temperature rises.
To review the „Set Point‟ Press the UP arrow key and the
„Set Point‟ will be displayed for approximately 1 second.
When the „Set Point‟ temperature is reached the left hand
L.E.D. on the GOTO key will illuminate and three audible
bleeps will sound to indicate the temperature has
stabilised.
4.2.8
Initiate Ramp.
Press GOTO to initiate the temperature ramp of 1.0 C per
minute. The four bar L.E.D‟s and the left hand L.D.D on the
GOTO will go out. The right-hand L.E.D will illuminate.
After a brief delay the oven temperature will commence to rise at
1.0 C per minute.
4.2.8a
Fast Ramp Selection –See Appendix B (Page 27).

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4.2.9
Analysis and Storage of Melt points.
The four basic stages of melting should be
anticipated as described in Principals of Operation on
Page 6. Proceed as follows:
Adjust the object lens by rotation until a sharp focus
on the sample is obtained.
When the desired stage of melt is observed press the
GOTO key to store that temperature in the memory.
Up to four values can be stored. An additional L.E.D.
above the GOTO key will illuminate as each value is
stored. After the fourth value is stored the oven
temperature will return to the „Set Point‟.
N.B. If less than four melt points are to be stored,
press the CLEAR key once only after the last
temperature has been stored, the oven temperature
will return to „Set Point‟.
4.2.10
Recall of Information.
To review the melt points:
The display will show the temperature of each
successive melt point held in the memory with each
subsequent depression of the GOTO key. An L.E.D.
above the GOTO will indicate which of the stored
temperatures is being displayed. If less than four
temperatures have been recorded then unused
memory will be displayed by 0000.
N.B. Temperatures must be recorded on paper at this
point.
4.2.11
a)
b)
To Carry out further melt
Press CLEAR only once. The current „Set Point‟ will
be displayed. If this is the value desired, press GOTO
keys as in section 4.2.7.
If a new „Set Point‟ is desired press the UP/DOWN
keys as in section 4.2.6. Press GOTO key as in
section 4.2.7. Do not insert new samples until
temperature has stabilised at the new „Set Point‟ (as
indicated in section 4.2.7). After insertion allow 2
minutes for tubes and samples to stabilise at the „Set
Point‟ before initiating ramp as in section 4.2.8.
N.B. Faster cooling where required can be achieved
by the insertion of a Cold Finger (Accessory AZ9001).

14
4.2.12
1.
2.
2a.
3.
4.
CLEAR Key.
The CLEAR key may be operated at any time and
will, depending upon the current stage, function as
follows:
If as section 4.2.6 operation of the CLEAR key will
reset display to 0000
If at section 4.2.7 by pressing CLEAR key the display
will show oven temperature and heater will control to
‟Set point‟.
Press CLEAR again and display shows 0000. Enter
new „Set Point‟ as described in section 4.2.6
If at section 4.2.8, pressing CLEAR once will prevent
further entry into the memory of the melt points, and
the oven will revert to „Set Point‟.
Pressing CLEAR again will display current „Set Point‟
–proceed at section 4.2.6
4.2.13
Oven off
Pressing CLEAR key three times during any stage
will turn off the heating to the oven.

15
Upon receipt of the instrument proceed consecutively as follows:-
4.2.1 Power Supply.
The power supply supplied with your new IA 9100 supports all A.C.
Mains supply voltages within the range of 100V to 240V inclusive at
50-60Hz. Do not use the power supply with a D.C. supply voltage or in
conjunction with any type of voltage regulation equipment. Do not use
with a mains supply supplying power at a different frequency other than
that stated.
4.2.2 Set-Up
N.B. DO NOT ATTEMPT TO MOVE ADJUSTMENT ARM BEFORE
RELEASING CLAMP SCREWS. (See Figure 4.).
After releasing the clamp screws, adjust the angle and extension of the
arm, and rotate the oven head if required in order to establish the most
comfortable viewing position; re-tighten screws.
Do not over tighten.
4.3.3 Connections (see Figure 5).
a) If a line printer is to be used it should now be connected to the instrument
using an approved cable. For PR2000B or PR2000S printer use the cable
supplied. For a parallel (Epson compatible) printer use cable AZ6732. For a
serial printer use cable AZ6731.
Always use an approved cable to prevent damage to your equipment.
b) Inset the jack connection Plug from the Power Supply Unit into the
instrument supply socket.
c) Connect the Power Supply mains cable to the Power Supply Unit.
d) Plug the Mains Power Supply cable into the supply outlet.

16
4.3.4
Initial Set-Up.
When the instrument is first received the following
procedure should be followed in order to set the
clock and print parameters.
For Instrument MK4 and below: Press the Batch
key and maintain the depression while the mains
power is switched on. The key must be kept
depressed until a second „Beep‟ is heard. Observe
all the indicator lights flash momentarily during this
procedure and ensure the display rolls from 9999 to
0000.
For Mark 5 Instruments: Switch on the Mains
Power. The display will roll from 9999 to 0000, while
this occurs momentarily press the Batch key. The
instrument will „Bleep‟ to indicate the key has been
pressed.
NOTE: The unit is equipped with a „Battery
Augmented Memory (BAM). A fully charged battery
will keep all data stored for one month even when
the unit is switch off. During normal mode of
operation the battery will remain charged. If the unit
has been switched off for more than a month reset
the clock and print parameters as described on page
17 and then leave the unit on for at least 24 hours to
recharge the battery.
If the set time is incorrect or the memory back-up
battery is flat (quite possible with a new instrument
prior to charging) operation of the BATCH key during
start-up is unnecessary. When the instrument is
switched on without depressing the BATCH key it
will de-fault to initial set-up mode and will indicate
this by a colon(:) in the display. Any figures
associated with the colon should be disregarded.

17
Setting the Clock and Print Parameters.
Enter the Year; Month; Day date and Time in
order as follows; (The figures for January 22nd
2005 at 09:56 are given as an example).
Press CLEAR
Press 0; 5; (enters the year) press GOTO
Press in turn 0; 1 (enters the month)
2; 2; (enters the day) GOTO
Press in turn 0; 9; 5; 6 (enters the time)
GOTO
After following the above procedure the
display will show current parameters. Default
is 0000 for PR2000
If PR2000B or no printer is to be used ensure
the display is 000.0
Press GOTO and proceed to page 18.
If EPSON compatible printer is to be used, set
the display to 001.0. Press GOTO and
proceed to page 18.
If Serial RS232-C printer is to be used set
display o 002.0 and press GOTO.
RS232-C parameters now need to be set:
See Appendix A. (Page 28).
For Serial printer PR2000S Set the
following values.
Set the date and time as previously described.
After setting the time press key 2 to select
printer serial communication mode.
Press GOTO.
Set the Baud rate to 4800 so:
Press keys 0,0,4,8, and press GOTO.
Set the Parity to 0.
Press the 0 key. Press GOTO.
Set the data Bits to 8.
Press the 8 key. Press GOTO.
Set the Stop bit to 1.
Press the 1 key. Press GOTO.
Press GOTO to confirm data entry.
The IA will now reset and the initialisation
count down sequence will commence. The IA
is now ready for printing via the PR2000S.
For PR2000S Serial Printer Baud rate set-
up see Appendix C (Page 30).

18
4.3.5
Normal Start-up
Switch the power on.
Observe all indicator lights flash
momentarily and then the display rolls
from 9999 to 0000 and settles at the
oven ambient temperature.
NOTE: In order to attain maximum
accuracy from the unit it is important to
allow all components to stabilise at their
working temperature. It is recommended
therefore that the unit is switched on for
30 minutes before use.
Alternatively the unit may be switched on
overnight at ambient temperature. The
bulb will supply sufficient heat to maintain
stability.
The insulation material of the oven may
absorb small amounts of moisture if left
un-powered for any length of time
(dependant upon ambient conditions). It
is suggested the oven is heated up to a
temperature of 300 C before use as
described in sections 4.3.7 and 4.3.8,
with the removed, and then allowed to
cool, switching the oven off as in section
4.3.14 before replacing the lens.
4.3.6
Prepare a Sample
Up to three samples may be
accommodated in the tube guide. To
prepare a sample proceed as follows:
Break a new capillary tube in half and
insert the powdered sample in the tube.
The quantity should be such that the
height dose no exceed 1mm.
Locate the sample in the tube guide. It is
recommended that three tubes are
inserted even if each tube dose not
contain a sample.
4.3.7
Enter the ‘Set Point’
Proceed as follows:
A figure of 95.6 C is given as an
example.
Press ENTER –the display will change
to register the previous „Set Point‟ if one
exists. Press CLEAR. Key in the figures
0; 9; 5; 6 and the display will show 095.6
as a „Set Point‟.
If an incorrect „Set Point‟ value is keyed
in, press CLEAR and key in the correct
value. Do not key in a value above 400 C

19
4.3.8
GOTO ‘Set-Point’
Press GOTO key, (if long audible
bleep is heard and the display
does not change then the „Set
Point‟ is outside allowable
parameters. Key in correct „Set
Point‟). The four bar L.E.D‟s will
illuminate consecutively as the
temperature rises. To review „Set
Point‟ press RECALL and the
display will show „Set Point for
approximately one second. When
the „Set Point‟ temperature is
reached the left hand L.E.D. on
the GOTO key will illuminate and
three audible bleeps will sound to
indicate the temperature has
stabilised.
4.3.9
Select Ramp Rate.
This may be done by one of two
methods:-
Method 1 –selected if a preset
ramp rat is suitable.
Method 2 –selected if an internal
ramp value is required. Any ramp
rate may be selected between
0.2 C/ per min and 10.0 C / per
min in 0.1 steps.
Proceed as follows:
Method 1 - Select on of the five
preset ramp rate values 1.0; 0.2;
0.5; 2.0; or 3.0. Press the select
key.
Method - Ramp rate value of
2.5 C/per min is given as an
example;
Press in turn ENTER; GOTO.
NOTE. The entered value method
2 must not exceed 10 C/per min.
If too high value s entered, an
audible warning is given and the
instrument will wait in a stalled
condition. Press CLEAR and enter
an acceptable value.
With the ramp rate entered, the
four bar L.E.D‟s and the left hand
L.E.D. on GOTO will go OFF and
the right hand L.E.D. will
illuminate.
4.3.7a
Fast Ramp Selection.
See Appendix B (Page 29).

20
4.3.10
Analysis and Storage of Melt points.
The four basic stages of melting should
be anticipated as described in
Principals of Operation on Page 6.
Proceed as follows:
Adjust the object lens by rotation until a
sharp focus on the sample is obtained.
When the desired stage of melt is
observed press the GOTO key to store
that temperature in the memory. Up to
four values can be stored. An additional
L.E.D. above the GOTO key will
illuminate as each value is stored. After
the fourth value is stored the oven
temperature will return to the „Set
point‟.
N.B. If less than four melt points are to
be stored, press the CLEAR key once
only after the last required temperature
has been stored. (Oven temperature
will return to „Set Point‟).
4.3.11
a)
Recall and processing of
Information.
Four operations for information
processing are available as follows:
a) Review of the current melt
batch.
b) Store
c) Recall
d) Print
Review of the current melt batch.
This is obtained by successive
depressions of the GOTO key.
Repeated operations of the GOTO key
will display the batch parameters in the
following sequence:
Melt point 1; melt point 2; melt point 3;
Melt point 4; „Set Point‟. Ramp rate.
Year; Month and Date; Hour and
Minute.
The display will show the temperature
of each successive melt point and the
L.E.D above the GOTO will indicate
which of the stored temperatures is
being displayed. If less than four melt
points have been stored unused
memory will be displayed as 0000.
NOTE: The CLEAR key may be
operated at any time to cancel the
review sequence.