Isotech ITL-M-18233 Operating instructions

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WTPMB Model 18233: 07–12/16
WATER TRIPLE POINT
MAINTENANCE BATH
MODEL ITL-M-18233
User Maintenance Manual/Handbook
Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England
Tel: [phone] Fax: [phone] Internet: www.isotech.co.uk E-mail: [e-mail]
The company is always willing to give technical advice and assistance where appropriate. Equally, because of the programme of
continual development and improvement we reserve the right to amend or alter characteristics and design without prior notice.
This publication is for information only.

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WTPMB Model 18233: 07–12/16
CONTENTS
EMC INFORMATION ........................................................................................................................................................ 4
ELECTRICAL SAFETY ........................................................................................................................................................ 5
Environmental Ratings................................................................................................................................................................. 5
HEALTH AND SAFETY INSTRUCTIONS .......................................................................................................................... 6
GUARANTEE ............................................................................................................................................................................. 7
CAUTIONARY NOTE ....................................................................................................................................................... 8
GENERAL INFORMATION ........................................................................................................................................................ 9
SYSTEM DESCRIPTION ................................................................................................................................................................. 9
SPECIFICATIONS........................................................................................................................................................................... 9
OPERATING INSTRUCTIONS................................................................................................................................................. 10
INSTALLATION ........................................................................................................................................................................... 10
Location .................................................................................................................................................................................... 10
General Layout.......................................................................................................................................................................... 10
Start Up..................................................................................................................................................................................... 12
OPERATION ................................................................................................................................................................................ 12
USING THE CONTROLLER..................................................................................................................................................... 13
THE ISOTECH SPLASH SCREEN AND CONTROLS.................................................................................................................. 14
HOW TO LOG IN AS THE SUPERVISOR .................................................................................................................................... 15
HOW TO LOG IN AS THE ENGINEER........................................................................................................................................ 15
CHANGING THE SET POINT ..................................................................................................................................................... 16
To change the setpoint of the equipment ................................................................................................................................. 16
How to change from °C to °F or Kelvin................................................................................................................................... 16
HOW TO USE THE ALARMS AND ADDITIONAL SAFETY FEATURES OF THE CONTROLLER ............................................ 17
Control sensor alarms:.............................................................................................................................................................. 17
Left and Right side alarms for under temperature protection: ................................................................................................. 17
In the event of an alarm condition: ........................................................................................................................................... 17
What happens next: .................................................................................................................................................................. 17
How to apply a fixed offset to the control sensor to compensate for temperature errors:..................................................... 18
If the bath becomes unstable: ................................................................................................................................................... 18
Ambient temperature indicator: ............................................................................................................................................... 18
HOW TO CHANGE THE DATE AND TIME OR THE LANGUAGE OF THE EQUIPMENT:..................................................... 18
TO CHANGE THE DATE AND TIME OR LANGUAGE: ............................................................................................................. 18
THE NETWORK INTERFACE:..................................................................................................................................................... 19
TO ACCESS THE NETWORK INTERFACE:................................................................................................................................ 19
DATA LOGGING: ........................................................................................................................................................................ 19
FTP SERVER ARCHIVING:............................................................................................................................................................ 20
MAINTENANCE ...................................................................................................................................................................... 21
ROUTINE MAINTENANCE......................................................................................................................................................... 21
CALIBRATION ............................................................................................................................................................................. 21
THEORY OF OPERATION....................................................................................................................................................... 22
REFRIGERATION ......................................................................................................................................................................... 22
REPAIR PROCEDURES................................................................................................................................................................. 22
CONTROLLER REMOVAL........................................................................................................................................................... 22
AIR PUMP REPLACEMENT.......................................................................................................................................................... 23
LINE VOLTAGE CONVERSION .................................................................................................................................................. 23
TANK ASSEMBLY REMOVAL....................................................................................................................................................... 23

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WTPMB Model 18233: 07–12/16
THERMAL FUSE REPLACEMENT................................................................................................................................................ 24
FAN REPLACEMENT ................................................................................................................................................................... 24
Refrigeration Diagram ............................................................................................................................................................... 25
APPENDIX A: AN INTRODUCTION TO THE WATER TRIPLE POINT .................................................................................. 26
APPENDIX B: TRIPLE POINT CELL OPERATION................................................................................................................... 28
ISOTECH I-CAL EASY.............................................................................................................................................................. 31
PROGRAM EDITOR ................................................................................................................................................................. 32

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WTPMB Model 18233: 07–12/16
EMC INFORMATION
This product meets the requirements of the European Directive on Electromagnetic Compatibility (EMC)
89/336/EEC as amended by EC Directive 92/31/EEC and the European Low Voltage Directive 73/25/EEC, amended
by 93/68/EEC. To ensure emission compliance please ensure that any serial communications connecting leads are
fully screened.
The product meets the susceptibility requirements of EN 50082-1, criterion B.
Symbol Identification
Publication
Description
ISO3864
Caution (refer to manual)
IEC 417
Caution, Hot Surface

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WTPMB Model 18233: 07–12/16
ELECTRICAL SAFETY
This equipment must be correctly earthed.
This equipment is a Class 1 Appliance. A protective earth is used to ensure the conductive parts cannot become live
in the event of a failure of the insulation.
The protective conductor of the flexible mains cable which is coloured green/yellow MUST be connected to a suitable
earth.
The blue conductor should be connected to Neutral and the Brown conductor to Live (Line).
Warning: Internal mains voltage hazard. Do not remove the panels.
There are no user serviceable parts inside. Contact your nearest Isotech agent for repair.
Voltage transients on the supply must not exceed 2.5kV.
Conductive pollution e.g. Carbon dust, must be excluded from the apparatus. EN61010 pollution degrees 2
Environmental Ratings
Operating Temperature 5-50°C
Relative Humidity 5-95%, non condensing

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WTPMB Model 18233: 07–12/16
HEALTH AND SAFETY INSTRUCTIONS
1. Read this entire manual before use.
2. Wear appropriate protective clothing.
3. Operators of this equipment should be adequately trained in the handling of hot and cold items and liquids.
4. Do not use the apparatus for jobs other than those for which it was designed, i.e. the calibration of
thermometers.
5. Do not handle the apparatus when it is hot (or cold), unless wearing the appropriate protective clothing and
having the necessary training.
6. Do not drill, modify or otherwise change the shape of the apparatus.
7. Do not dismantle the apparatus.
8. Do not use the apparatus outside its recommended temperature range.
9. If cased, do not return the apparatus to its carrying case until the unit has cooled.
10. There are no user serviceable parts inside. Contact your nearest Isotech agent for repair.
11. Ensure materials, especially flammable materials are kept away from hot parts of the apparatus, to prevent
fire risk.
12. Ensure adequate ventilation when using oils at high temperatures.

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WTPMB Model 18233: 07–12/16
GUARANTEE
ⓒIsothermal Technology Limited
This instrument has been manufactured to exacting standards and is guaranteed for twelve months against electrical
break-down or mechanical failure caused through defective material or workmanship, provided the failure is not the
result of misuse.
In the event of failure covered by this guarantee, the instrument must be returned, carriage paid, to the supplier for
examination and will be replaced or repaired at our option.
FRAGILE CERAMIC AND/OR GLASS PARTS ARE NOT COVERED BY THIS GUARANTEE INTERFERENCE WITH
OR FAILURE TO PROPERLY MAINTAIN THIS INSTRUMENT MAY INVALIDATE THIS GUARANTEE
The company is always willing to give technical advice and assistance where appropriate. Equally, because of the
programme of continual development and improvement we reserve the right to amend or alter characteristics and
design without prior notice. This publication is for information only.
This handbook contains information that has been reproduced with the kind permission of Eurotherm. Such data is
subject to the following notice.
Isothermal Technology Limited
Pine Grove, Southport, Merseyside, PR9 9AG, England
Telephone: [phone]/544611 / Fax: [phone]
Email: [email protected]o.uk / Website: www.isotech.co.uk

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CAUTIONARY NOTE
ISOTECH PRODUCTS ARE INTENDED FOR USE BY TECHNICALLY TRAINED AND COMPETENT
PERSONNEL FAMILIAR WITH GOOD MEASUREMENT PRACTICES.
IT IS EXPECTED THAT PERSONNEL USING THIS EQUIPMENT WILL BE COMPETENT WITH THE
MANAGEMENT OF APPARATUS WHICH MAY BE POWERED OR UNDER EXTREMES OF TEMPERATURE, AND
ARE ABLE TO APPRECIATE THE HAZARDS WHICH MAY BE ASSOCIATED WITH, AND THE PRECAUTIONS
TO BE TAKEN WITH, SUCH EQUIPMENT.

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GENERAL INFORMATION
SYSTEM DESCRIPTION
The Water Triple Point Bath is designed to provide an environment in which up to four Water Triple Point Cells can
be maintained for use as primary standards of temperature. The life of the ice mantle in a triple point cell is
dependent upon the initial geometry of the mantle, the use of the cell and the temperature of its environment. The
bath has sufficient stability to maintain a mantle for six weeks or more, provided that the cell is not thermally
overloaded.
The bath contains about 34 litres of water which is agitated with air supplied by a pump located on the controller
chassis. The temperature of the water is maintained at 0.010°C by four thermoelectric cooling modules. The current
through the cooling modules is controlled by a proportional controller which uses a precision, high stability,
thermistor probe to sense bath temperature.
The cooling system has sufficient cooling capacity to bring the bath to operating temperature from 25°C in about two
days. The limited cooling capacity provides some protection for the cells in case of control failure, since the water in
the bath would freeze only very slowly. Additional protection is provided by a fault detection system which is
triggered if either of the cooling surfaces drops below a preset limit or by the formation of ice on the cooling surfaces
of the bath. Triggering of either fault detector will, after a built-in delay, activate the fault alarm and remove power
from the coolers until the system is reset by turning the power switch off and back on.
SPECIFICATIONS
Size: 910mm high, 635mm wide, 710mm deep
Weight: Approximately 66kg dry
Acceptable Ambient Conditions:
Operating: Temperature 15°C to 26°C; relative humidity 10% to 80%
Storage: Temperature -30°C to 55°C; relative humidity less than 85%
Power Requirements:
115/230v AC, 50/60 Hz, 150 VA max
Bath Fluid: De-ionised water, approximately 34 litres (7½ gal)
Bath Temperature: 0.010°C nominal (adjustable
-0.5°C to +0.5°C, approximately)
±2mK/month

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WTPMB Model 18233: 07–12/16
OPERATING INSTRUCTIONS
INSTALLATION
Location
The typical industrial standards laboratory provides an environment suitable for the bath, which is designed to operate
at an ambient temperature between 15 and 26°C, in air that is relatively free of particulate material (particularly
soluble salts) and soluble or corrosive gases such as ammonia or sulphur dioxide. The clearance necessary for cooling
air to circulate through the back of the cabinet is provided by the extended frame around the air filter. This frame
may be placed directly against a wall as long as the lower opening is not obstructed. The cabinet is equipped with
castors so that it may be moved easily; however, care must be taken to avoid splashing water out of the bath. Power
requirements need no special consideration; maximum power consumption is 150VA, and interruptions of a few
minutes will not affect the condition of the cells because of the large thermal inertia of the bath.
General Layout
Figure 1. Front View:
1. Cell Access
2. Lid
3. Name Plate
4. Control Facia
5. Precool Pocket
6. Handle

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WTPMB Model 18233: 07–12/16
Figure 2. Rear View:
1. Air Filter
2. Identification Plate
3. Power Entry
4. Fan Socket
5. Tank Power Socket
6. Air Adjust
7. Air Output
8. Alarm Right Sensor
9. Alarm Left Sensor
10. Controller Sensor
Figure 3. Control Panel:
1. USB Port
2. Alarm Left Beacon
3. Output Beacon
4. Ethernet
5. Controller
6. Alarm Right Beacon
7. Power Switch
8. Handles

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Start Up
1. Visually inspect the system to ensure that it has not been damaged in transit.
2. Connect the mains cable to a suitable supply socket outlet and turn the power switch on. The alarm sounder
will operate momentarily while the controller boots up.
3. Fill the tank to the top of the cell holder tubes with clean, de-ionised water.
4. Monitor the water temperature. The temperature should drop about 0.6°C per hour from 20°C. Do not use
ice, this will increase the risk of forming ice mantles on the sides of the tank.
5. Monitor the controller display to check for descent to temperature and when the bath is ready for use.
OPERATION
Six openings are provided in the lid of the bath. The two small openings permit access to the thermometer pre-chill
tubes and the four large openings permit access to the cells. The large openings should be kept closed with the split-
plugs provided (these have thermometer channels so that closure may be maintained during use). The bath does not
have sufficient cooling capacity to operate with the top open to ambient air.
The water level in the bath should just cover the top of the main body of the cells. Whenever the number of cells
kept in the bath is changed, the water level should be adjusted to compensate. The water level and air filter should
be checked weekly and maintained correctly. See Maintenance.
Some micro-organisms are capable of growing in water near 0°C. Cloudy water and/or slimy surfaces in the bath may
indicate such growth. See Maintenance.
Due to the long cool down time we recommend that the bath is left running continuously; this maximises the life of
the bath.
Internal trips and temperature alarms protect the system and running costs are very low. We do not recommend
powering the bath up then down for short periods of operation.

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WTPMB Model 18233: 07–12/16
USING THE CONTROLLER
The controller installed on this equipment uses an advanced three loop controller with a multi-channel sensor input.
Other features of the controller are:
Built in data logging
Ethernet connection
USB host for controller updates and data export
Bright colour display
Dynamic optimisation of the control PID parameters
Before using the controller, please read this manual thoroughly to get the best performance from the equipment.
Certain features used in this controller require different levels of access. The Operator access requires no passcode
to use. These functions include:
Changing the setpoint
Changing any values using the USER ACCESS PAGE (figure 7)
Other features will require the user to log in as “Supervisor” to carry out these functions. These include:
Adjusting the PID settings
Extracting data from the recorder function
Configuration changes to the controller require you log in as “Engineer” to perform these functions. These include:
Change language selection
Change °C to °F or K
Change equipment clock and time zone

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WTPMB Model 18233: 07–12/16
THE ISOTECH SPLASH SCREEN AND CONTROLS
Figure 4. The USER INTERFACE start up screen and controls:
1. ISOTECH splash screen
2. PAGE button
3. SCROLL button
4. DOWN button
5. UP button
Figure 5. The HOME page:
1. Water temperature
2. Setpoint
3. Left alarm sensor value
4. Right alarm sensor value
5. Ambient temperature
6. Setpoint adjust box
7. PAGE button
8. SCROLL button
9. DOWN button
10. UP button

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WTPMB Model 18233: 07–12/16
HOW TO LOG IN AS THE SUPERVISOR
Figure 6
1. Press the Page button to display the Home menu
2. Scroll to LOG IN
3. Press the SCROLL button
4. Press up to scroll to SUPERVISOR in dialogue box
5. Press the SCROLL button to prompt for a passcode
6. Select code 15 from the soft keyboard
7. Press PAGE button to prompt to accept the changes
8. Select Yes and enter with SCROLL button to display the SUPERVISOR screen (figure 9)
9. When logged in as the SUPERVISOR the equipment will control in the normal way
HOW TO LOG IN AS THE ENGINEER
1. Press the Page button to display the Home menu
2. Scroll to LOG IN
3. Press the SCROLL button
4. Press up to scroll to ENGINEER in dialogue box
5. Press the SCROLL button to prompt for a passcode
6. Select code 17 from the soft keyboard
7. Press PAGE button to prompt to accept the changes
8. Select Yes and enter with SCROLL button to display the ENGINEER screen (figure 9)
9. When logged in as the ENGINEER, the equipment will not control the temperature of the heat source

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WTPMB Model 18233: 07–12/16
Figure 7. The USER ACCESS page:
1. Proportional band
2. Integral time
3. Derivative time
4. Control sensor Alarm Low value
5. Control sensor Alarm High value
6. Left side Alarm value
7. Right side Alarm value
8. Alarm Reset
9. Units
10. Fixed offset value
CHANGING THE SET POINT
To change the setpoint of the equipment
1. From the ISOTECH homepage, press the SCROLL button once, this will highlight the SETPOINT ADJUST box.
2. Press the SCROLL button once more and this will allow adjustment of the setpoint via the UP/DOWN buttons.
3. Scroll to the desired set point as described above.
4. When the temperature is set, press the SCROLL button again to enter and save the setting.
5. The equipment will now raise or lower the furnace temperature as required.
How to change from °C to °F or Kelvin
1. Scroll to the USER ACCESS page
2. Scroll to UNITS
3. Highlight value
4. Scroll to UNITS
5. Scroll to °C, °F or Kelvin
6. Enter the value with Page key

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WTPMB Model 18233: 07–12/16
HOW TO USE THE ALARMS AND ADDITIONAL SAFETY FEATURES OF THE
CONTROLLER
This equipment has several alarm features built in to facilitate the safety of the Water Triple point cells contained
within. In almost all conditions the controller will reset the set point to a safe value to ensure the integrity of the
cell(s) and to prevent the freezing of the water within the cell(s). The alarm trigger values are accessible within the
USER ACCESS LIST and can be adjusted by the user. However, care should be taken not to set the values too far
and to render the safety circuit unresponsive.
Control sensor alarms:
For the safety of the installed Water triple point cells, there are several safety features built into the equipment. The
control sensor has two discrete alarms for the protection of the water temperature inside the tank.
Under temperature alarm –in the event of the water in the tank dropping below the user defined value (User Access
List) the controller will illuminate both the LEFT and RIGHT alarm LEDS simultaneously. If no remedial action is
taken within 20 minutes, the audible sounder will begin and the controller will reset the set point to +5°C to allow
the water to warm to a safe condition.
Over temperature alarm –in the event of the water in the tank rising in temperature in excess of the user defined
value, either as a result of the lid being left open or other reasons. Both the LEFT and RIGHT alarm LEDS will
illuminate simultaneously. If no remedial action is taken within 5 minutes then the audible sounder will begin and
controller will reset the set point to 5°C to allow the water to warm to a safe condition.
Left and Right side alarms for under temperature protection:
The heat is conducted from the water by means of the thermoelectric heat pumps on the sides of the tank assembly.
Inside the assembly are built two temperature sensors, one on the left and one on the right. These are for safety in
the event of the sides of the tank drop in temperature beyond the freezing point of the water and create ice mantles
on the side of the tank.
If the temperature drops below the user defined value (USER ACCESS LIST) then the corresponding side LED alarm
will illuminate. If no remedial action is taken within 20 minutes then the audible sounder will begin and the controller
will reset the set point to 5°C.
In the event of an alarm condition:
In the event of an alarm condition and remedial action is taken within the given time, i.e. the sounder cannot be heard
but the LEDs are illuminated. Under these circumstances the equipment will reset automatically and the function will
carry on as normal.
If the sounder has begun and the controller has reset the temperature, this means that the user will need to ensure
the reason for the trigger has been resolved and the bath is safe. Please ensure there is no ice mantle on the side
plates of the tank and that the Water Triple point cells are safe with no ice bridge present within the cell.
What happens next:
When the bath is deemed safe for a reset, scroll to the USER ACCESS page.
Press Scroll button to access the list and scroll down to ALARM RESET. Highlight the value and scroll to YES and
enter the value. The alarm will now be reset, the sounder will switch off and the controller will reset the set point to
the last known value.

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How to apply a fixed offset to the control sensor to compensate for temperature errors:
In the event of that the controller display value is in error to the actual temperature of the water inside the tank,
there is an OFFSET feature to enable the adjustment of the value to correct for this.
To apply an offset value to the Controller display value, scroll to the USER ACCESS page. Access the list and scroll to
the OFFSET feature. Open the setting and a soft keyboard will open. Enter the correct correction value and enter
the value with the page button. Exit from the page back to the HOME page and the correction will now be visible.
If the bath becomes unstable:
This bath will control the water inside the tank within a very small stability band of better than +/- 0.002°C. In the
event of the bath becoming unstable, there are the controller PID settings promoted to the USER ACCESS PAGE
(Proportional band, Integral Time and Derivative time) to allow the adjustment of the stability band.
Please note: An understanding of PID temperature control is required to adjust these settings. Any adjustment is
made entirely at the user risk.
Ambient temperature indicator:
The controller display has an ambient temperature value. This displays the ambient temperature within the controller
case. This is particularly useful for diagnostic purposes in the event of control stability issues or alarm “nuisance”
tripping. Due to the very stable nature of the temperature control, the bath is sensitive to rapid changes in
environmental temperature and this feature allows the recording of the ambient to ensure easy diagnostics in the
future.
HOW TO CHANGE THE DATE AND TIME OR THE LANGUAGE OF THE EQUIPMENT:
The Date and time of the equipment can be changed to suit local time. This can also incorporate the any daylight
saving time in the time zone of your country or region. The display language of some of the display screens can also
be change to suit the local language.
The options for this are:
English
French
German
Italian
Spanish
Note: Only the Supervisor and Engineer menus will read in the alternative language. The Isotech Home screen will
still read in English when this feature is used.
TO CHANGE THE DATE AND TIME OR LANGUAGE:
To access these features you will need to log in as the Engineer.
When logged in, scroll to the INSTRUMENT tab on the Engineer homepage
Press the SCROLL button to enter
Scroll to CLOCK and enter by pressing SCROLL button
Alternatively scroll to LOCALE and enter by pressing SCROLL button
Adjust as necessary and exit engineer mode

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THE NETWORK INTERFACE:
Access to the NETWORK interface is available when logged in as the ENGINEER. This will allow adjustment to
various network parameters, should they need to be adjusted.
This menu allows writeable access to:
IP type (FIXED or DYMAMIC)
IP address
Subnet Mask
Gateway
and Read only access to:
MAC address
Client identifier
TO ACCESS THE NETWORK INTERFACE:
1. Log in as the ENGINEER
2. From the ENGINEER page scroll to NETWORK tab and enter with the SCROLL button
3. Scroll to INTERFACE and enter with the scroll button
4. Scroll to and adjust desired parameter using the pop out soft keyboard
DATA LOGGING:
The equipment will always record data for all four channels UNLESS the equipment is in ENGINEERING mode. This
is indicated by the green Rin the bottom left had side of the ISOTECH homepage.
The data can either be extracted via the USB socket on the front panel or to a PC by means of the FTP protocol
(Remote Archiving) using REVIEW software, see page 31 for details.
To back up the data via USB stick on the control panel use the following procedure:
1. Log in as the SUPERVISOR
2. Plug a suitable USB memory stick to the socket on the control panel (Figure 1, item 6)
3. Ensure the controller has accepted the memory stick by the icon in the lower left of the ISOTECH homepage
(figure 3)
4. Press the page button to scroll to the SUPERVISOR menu
5. Scroll to DEMAND ARCHIVING
6. Scroll to ARCHIVE TO and enter, select USB from the options and enter
7. Scroll to ARCHIVE and select from:
a) Bring to date
b) All
c) Last month
d) Last week
e) Last day
f) Last hour
g) None

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8. When the selection is entered by pressing the SCROLL button, the transfer will begin (this may take several
minutes depending on the selection made)
9. When the transfer is complete, remove the USB stick and exit SUPERVISOR mode
The data will be stored in a folder called HISTORY.
FTP SERVER ARCHIVING:
This allows the archiving of recorder files to a remote computer via the RJ45 type connector on the front panel,
either directly or via a network.
In order to carry out a successful transfer:
1. Details of the remote host must be entered in the Network Archive area of configuration
2. The remote computer must be set up as an FTP server. Help from the user’s IT department may be necessary
in order to achieve this.
3. The remote computer must also be set up to respond to ‘pings’. This is because the instrument pings the host
whilst establishing connection, if it does not receive a response the archive attempt fails.
4. When accessing files using Microsoft® Internet Explorer, the address (URL) field can be in one of two formats:
5. ftp://<instrument IP address>. This allows a user to log in as the anonymous user if the recorder has any
account with the user name set to ‘anonymous’ with a blank password.
ftp://<user name>:<password>@<instrument IP address> to log in as a specific user.
For IE5 users, Microsoft® Internet Explorer displays, by default, history files only. To quit the history folder, either
uncheck the Tools/Internet Options/Advanced/Browsing/’Enable folder view for FTP sites’ option, or check the
Tools/Internet Options/Advanced/Browsing/’Use Web based FTP’ option.