MEDUSA 510/511 SERIES
MEDUSA 510 / 511 SERIES
HANDBOOK
ISSUE 10 - 11/05
Isotech North America
158 Brentwood Drive, Unit 4
Colchester, VT 05446
Phone: 802-863-8050
Fax: 802-863-8125
www.isotechna.com
sales@isotechna.com
The company is always willin g 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 pu bl i cation is for
information only.
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MEDUSA 510/511 SERIES
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CONTENTS
PAGE
3 - 4 EMC Information
5
6
7 Guarantee
8
9
10, Unpacking & Initial Inspection
11,12,13
14,15
16 Adjusting the Timer
17,18
19
20
21,22
23,24 Operating the Controller
25,26,27,28
29,30
31
32 Using the PC Interface
33,34
35
36 Initial Testing
37
38
39 Figure 3
40
41,42
43,44 Appendix 3 - Indicator Configuration
DESCRIPTION
Health & Safety Instructions
Do’s and Don’ts
Cautionary Note
Transit Clamp Notice
Introduction
Mode of Operation
Thermometric Fixed Points (a tutorial note)
How to measure the true temperature insi d e the accessories
supplied with the Medusa
Specification
Performance Graphs
Operating the Indicator
Connecting a Current Transmitter (up to 20mA)
Selecting Configuration Level
Testing Thermostats
Operating the Medusa 511
Using Cal Notepad
Diagnostics
Maintenance
Figure 2
Appendix 1 - Trouble Shooting
Appendix 2 - Accessories
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EMC INFORMATION
This product meets the requirements of the European Directive on Electromagnetic Compatibility
(EMC) 89/336/EEC as amended by EC Directive 92 /3 1 /E EC 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 (RS232 or RS422(485)) are fully screened.
The product meets the susceptibility requirements of EN 50082-1, criterion B.
Symbol Identification Publication Description
ISO3864 Caution
(Refer to Handbook)
IEC 417
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
can not 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.
Caution, Hot Surface
The blue conductor should be connected to Neutral and the Brown conductor to Live (Line).
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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, eg. Carbon dust, must be excluded from the apparatus. EN61010 pollution
degree 2.
The apparatus has two inpu t co nn ectors for temperature sensors, see Figure 2. These inputs
are only suitable for either a thermocouple or resistance thermometer. No other sensor or signal
may be connected.
ENVIRONMENTAL RATINGS
Operating Temperature
Relative Humidity 5-95%, non condensing
5-35°C
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HEALTH AND SAFETY INSTRUCTIONS
1. Read all of this handbook before use.
MEDUSA 510/511 SERIES
HANDBOOK
ISSUE 10 - 11/05
2.
3.
4.
5.
6.
7. Do not dismantle the apparatus.
8.
9.
10. There are no user serviceable parts inside. Contact your nearest Isotech agent for
Wear appropriate protective clothing.
Operators of this equipment should be adequately trained in the handling of hot and cold
items and liquids.
Do not use th e apparatus for jobs other than those for which it was designed, ie. the
calibration of thermometers.
Do not handle the apparatus when it is hot (or cold), unl ess we aring the appropriate
protective clothing and having the necessary training.
Do not drill, modify or otherwise change the shape of the apparatus.
Do not use the apparatus outside its recommended temperature range.
If cased, do not return the apparatus to its carrying case until the unit has cooled.
repair.
11. En su re materials, especially flammable materials are kept away from hot parts of t he
apparatus, to prevent fire risk.
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MEDUSA MODEL 510/511
‘DO’S AND DON’TS’
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HANDBOOK
ISSUE 10 - 11/05
DO NOT handle the accessories when they are very hot or very cold.
DO NOT place hot or cold accessories back in the carrying case
DO NOT use the pocket designed for the black body source sensor to measure the temperature
of the insert or surface calibrator.
DO use that pocket for pre-warming or storage.
DO NOT spill liquids inside the Medusa.
DO NOT rely on the controller to tell you the temperature of the insert. It’s job is only to provide
an isothermal volume. It is the calibrated working standard that is used to measure actual
temperature.
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GUARANTEE
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
RECOMMENDATION
The life of your ISOTECH Instrument will be prolonged if regular maintenance and cleaning to
remove general dust and debris is carried out.
Serial No:.............................................
Date:.....................................................
Isotech North America
158 Brentwood Drive, Unit 4
Colchester, VT 05446
Phone: 802-863-8050
Fax: 802-863-8125
www.isotechna.com
sales@isotechna.com
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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 MANA GE M ENT 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.
HANDBOOK
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TRANSIT CLAMP
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EVERY EFFORT HAS BEEN MADE TO PACKAGE THIS UNIT FOR TRANSPORT AND TO
ENSURE ITS GOOD CONDITION ON ARRIVAL AT ITS DESTINATION
BEFORE COM M ISSIONING IT IS NECESSARY TO REMOVE THE FURNACE CORE TRANSIT
CLAMP. TO AVOID DAMAGE PLEASE FOLLOW INSTRUCTIONS
1.
2. Remove the 4 bolts securing the transit clamp to the side of the unit. Slacken each
3.
4. Normal commissioning procedure may now be followed.
5.
Slacken the central nut using the required tube spanner; the insertion of a screwdriver
through the tube spanner will prevent the central stud turning.
screw equally by degrees and then completely remove the screws.
Gently lift the transit clamp vertically; a central tube which has secured the furnace core
will then slide out. The 4 screws should then be replaced to secure the handles to the
side of the unit.
Keep the transit clamp and use it if the furnace is ever transported.
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UNPACKING AND INITIAL INSPECTION
Our Packing Department uses custom designed packaging to send out your unit, but as accidents
can still happen in transit, you are advised, after unpacking the unit, to inspect it for any sign of
shipping damage, and confirm that your delivery is in accordance with the packing note. If you
find any damage or that part of the delivery is missing notify us or our a gen t, and the carrier
immediately. If the u n i t i s damaged you should keep the packing for possible insurance
assessment.
ELECTRICITY SUPPLY
Before connecting to the electricity supply please familiarise yourse l f wi th the parts of the
handbook relevant to your model.
Your unit's supply voltage requirement is specified on a plate on the instrument along with the
serial number. All Medusa i nstruments will work on an electricity supply frequency of 50Hz or
60Hz.
The apparatus is provided with an approved power cord. If the plug is not sui ta b l e for your
lo
c
at
io
n
then the plug should be removed and replaced with an appropriate plug.
Take care to ensure the old plug is disposed safely.
The cable is colour coded as follows:
COLOUR FUNCTION
Green/yellow Earth (Ground)
Brown Live (line)
Blue
Neutral
Please ensure that your unit is correctly connected to the electricity supply.
THE APPARATUS MUST BE CORRECTLY EARTHED (GROUNDED)
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The units on/off switch is located on the power inlet. Take care NOT to switch the unit off when
it is hot - allow to cool first.
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INTRODUCTION
The Medusa range of products allows unprecedented flexibility for the calibration of temperature
sensors. The Medusa may be used with the following options:
1.
2.
3. A Black Body Source
4.
The Medusa is available in two variants. The Basic (B) model which incorporates a single
temperature controller. The Potts and Site (S) model also include a temperature indicator and
timer.
COMPARISON CALIBRATION:
By definition, one compares industrial thermometers to a calibrated standard.
There are 3 methods commonly used.
1)
Using the controller as the “calibrate d standard” this method means that the complete bath is
calibrated by comparing the controller reading to a calibrated standard placed in the bath.
This is a common method but is unsafe since the control sensor is
An ITS-90 Fixed Point Apparatus
As a Metal Block Bath
A Surface Sensor Calibrator
USING THE CONTROLLER
a)
b) in the wrong place to give correct temperature of the insert
For these reasons it fails to satisfy ISO9000 and gives large uncertainties.
inaccessible
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2)
Here an indicator and external calibrate d sen sor are used to measure the temperature of the
insert. This arrangement gives good accurate and re liable results. To recalibrate however it
does mean sending the whole calibrator back to the calibration laboratory. This, the calibrator is
self-contained, self-sufficient and meets ISO9000 requirements.
USING THE INDICATOR - (Not Basic (B) Model)
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3)
Here a separate indicator and calibrated sensor are used to measure the inserts temperature.
This can give the most accurate and reliable results, depending on the indicator.
It means that the calibrator does not need calibrating only the indicator and it’s calibrated sensor
need re-calibration, but this option is more bulky, expensive and less portable than 2) It also
meets ISO9000 requirements.
USING EXTERNAL STANDARDS
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MODE OF OPERATION
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1)
The ITS-90 fixed point function of the Medusa is well suited for fast , co nveni ent, mess free
calibration of thermometers to uncertainties as low at 0.001°C.
The special cell is placed into the Medusa calibration well.
The equipment incorporates a timer which can change temperatures to a l l ow MELTING or
FREEZING of a Cell. Once initiated the Cell can be arranged to be on the melt plateau during the
day and automatically frozen and bought back to the melt plateau overnight.
It works this way:-
The Medusa automatically switches on some 2 to 3 hours be f ore the working day starts and
gets the cell onto its melt plateau. The indicator tells the user on their arrival in the morning that
the melt has begun and calibration can commence.
If left unused the melt continues to 6 to 12 hours and probably during the night the timer switches
the apparatus off to re-freeze the cell, the cycle is repeated each day, giving the user the fixed
point all day, every day without attention except to occasionally clean the fan filter if it becomes
clogged with dust.
ITS-90 FIXED POINT CALIBRATION
The Medusa works by having a controller which is set about 1°C above the fixed point which
is inside the apparatus It has an indicator with a thermometer which is used to monitor the state
of the fixed point cell. It is also fitted with a timer to automatically switch on and off the
apparatus.
Indium, Tin Lead and Zinc Fixed Points all look the same, being an ingot of pure metal placed in
a graphite crucible which, to keep dirt, moisture and air out are sealed, usually in quartz glass.
To avoid the use of quartz glass the graphite crucibles are sealed into metallic containers without
contamination of the pure ingot inside the crucible.
On power up the timer is set to run at setpoint 1 for 20 hours at setpoint 2 for 4 hours.
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2)
The metal block bath function of the Medusa i s well suited for fast, convenient, mess free
calibration of temperature sensors.
The Medusa metal insert is placed into the calibration well.
The thermometers under test are placed into suitable holes in metal insert, see accessory page.
A calibrated reference probe should be placed into the insert and the actual temperature can be
read from the temperature indicator.
For traceable calibration the actual value of the insert temperature should be recorded along with
the values from the sensors under test.
3)
The black body function of the Medusa is well suited for fast, convenient, mess free calibration
of infra-red temperature sensors.
The Medusa black body target, see accessory page, is placed into the calibration well. The
units under test should be aligned with the target.
METAL BLOCK BATH
BLACK BODY SOURCE
A calibrated reference probe should be placed into the hole in the block a nd the actual
temperature can be read from the temperature indicator to which the infra red thermometer(s)
are compared.
4)
The surface sensor function of the Medusa is well suited fo r f ast, convenient, mess free
calibration of most surface temperature sensors.
The Medusa surface sensor insert, see accessory page, is placed into the calibration well.
A cal i b ra t ed pro be, see accessory page, is placed in the pocket of the surface sensor insert
and connected to the temperature indicator. Surface sensors are placed on top of the insert and
when stable compared to the calibrated probe.
SURFACE SENSOR CALIBRATION
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ADJUSTING THE TIMER
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THERMOMETRIC FIXED POINTS (a tutorial note)
Temperature scales used in science and ind ustry are defined by a series of "fixed points",
which are realised by establishing thermal conditions under wh i ch pure materials exhibit
equilibrium between two or three phases. A scale assigns numerical values to the temperatures
at which these phase equilibria exist. For example, the temperature at which pure water exists
simultaneously in its liquid, solid and gas phases (triple point) has been assigned the numerical
value of 0.01°C on the International Temperature Scale, and the value of 273.16K on the Kelvin
Thermodynamic Temperature Scale. Examples of other defining fixed points of the International
Temperature Scale of 1990 are the respective liquid-solid equilibria of tin, zinc and silver under
1 standard atmosphere pressure.
In some important disciplines it is desirable to realise a thermometric fixed point between 0 and
100°C, frequently in the vicinity of body or environmental-temperature. The melting temperature
of high purity gallium, 29.7646°C, is a fixed point that can be useful in this context.
The solid-liquid equilibrium point of gallium is realised in cells such as those shown in figure 1.
A quantity of pure gallium is contained in a vessel which provides, also, a re-entrant well for
insertion of a thermometer. The cycle for realising the melt equilibrium is as follows:
The galli u m sta rts in a single phase, assumed for present purposes to be liquid. The cell is
placed in a cold environment until the gallium has solidified. The phase-change of the metal can
be determined by tracing the temperature of the well. As the metal cools from the liquid phase,
the temperature will begin to fall. An initial smooth drop in temperature will be observed, and then
at some tempera ture b e l ow the freezing temperature there will be seen a reversal and a
subsequent rise in temperature. This "undercool" phenomenon is characteristic of many pu re
materials, most of which can remain liquid at temperatures below their normal freezing points (if
the metal were initially solid, the temperature would fall uninterruptedly to that of the cold
environment).
The reversal takes place as the first crystalline solid forms in the liquid; the temperature rises to
the liquid-solid equilibrium plateau temperature as the metal gives up latent heat on freezing,
remaining thereafter at this temperature until the metal is completely solid. Beyond this stage
there will be a smooth drop in temperature to that of surrounding environment.
To establish the melting condition, the cell is then transferred to an environment maintained at a
temperature slightly above the melt temperature of gallium. This environment may be a stirred
fluid bath of sufficient heat capacity and control capability, or may be the Medusa POT TS or
Gallium Temperature Standard Apparatus Model 17402B which is designed automatically to raise
the temperature of the cell to initiate melting of the metal and then to maintain it at a correct level.
The temperature to which the cell is exposed to melt the metal does not determine the solid-liquid
equilib ri um temperature, but it can have a substantial effect on the duration of the (constanttemperature) melt plateau.
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The monitoring thermometer will indicate a rise in temperature in the well as the solid gallium
approaches the melt temperature. Then, beyond the instant at which liquid first begins to form,
the temperature will remain constant until all the metal has melted. The end of the melt plateau
is signalled by a rise in well temperature to the temperature of the surrounding environment. An
ITL 17401 gallium cell used in the Model 17402B system can give a plateau duration of at least
12 hours.
The melting cycle is now complete. The material in the cell is entirely in the liquid phase. Another
cycle may be started immediately, if desired.
17cc of water should be poured into the re-entrant tube to allow proper conduction between cell
and thermometer.
For the hi g he st a c c u r a c y
measuremen ts (to less than 0.1mK of the
ITS-90 value) an ho u r shou l d e l apse
between switching t o m e l t a n d
c o m m e n c i n g m e a s u r e m e n t s .
Alternatively, once the melt has began the
water in the well ca n b e repl ace d b y
warm water at say 40°C t o initiate a melt
round the re-entrant tube. See CCT96/8 for
additional guidance.
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HINT
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HOW TO MEASURE THE TRUE TEMPERATURE INSIDE THE ACCESSORIES SUPPLIED
WITH THE MEDUSA SERIES
The controller of the Medusa controls and read s the temperature of the block surrounding the
deep calibration well.
There are various accessories including the surface calibration insert, black bo d y etc. These
adapt the Medusa to perform varied calibration functions.
None of these accessories actually get to the block te m perature and hence the controller’s
temperature because each accessory has a different i m m ersi o n characteristic. For this reason
the Medusa like all comparison baths requires a reference thermometer to indicate the true
temperature inside the accessory.
Remember the following:-
THE CONTROLLER
The controller is used to set a constant temperature and create an isothermal environment for
the comparison calibration of temperature sensors.
THE REFERENCE THERMOMETER
The Reference Thermometer is placed in the accessory or insert and measures the true
temperature inside the insert or accessory.
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THE INDUSTRIAL THERMOM ETER
The Industrial thermometer is p l ace d in the accessory or insert and is compared to the True
Temperature as indicated by the reference thermometer. An insert will typically have a 1%
immersion error. For more details see - Depths of Immersion. Tavener J. P. Volume 9.2. Isotech
Journal of Thermometry pages 79-87.
SPECIFICATION
Voltage : 230VAC (or 115VAC) see ratings plate
Power : 1800W
Supply Frequency
Maximum Operating Temperature : Medusa 1 - 550°C
Minimum Operating Temperature : Medusa 1 - 30°C
Stability (Absolute over 30 Minutes)
Metal Block Bath : ±0.03°C
Black Body Source : ±0.3°C
ITS-90 Fixed Point Apparatus
: ±0.0002°C
: 50/60Hz
Medusa 2/Medusa 511 - 700°C
Medusa 2/Medusa 511 - 35°C
Calibration Volume : 45mm dia by 285mm deep
Standard Insert Hole Dimensions: : 6 x 8mm
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Insert Options
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: Standard 6x8mm x 250mm deep
: Adjustable Height Equalising Block
: Special drilling available to customer
requirements.
: Blank
Dimensions (not including handle)
Weight : Medusa 1 - 17Kg
: Height 430mm
Width 310mm
Depth 300mm
Medusa 2/Medusa 511 - 26kg
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MEDUSA 510/511 SERIES
MEDUSA 1 PERFORMANCE GRAPHS
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MEDUSA 510/511 SERIES
MEDUSA 2 PERFORMANCE GRAPHS
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OPERATING THE MEDUSA
FRONT PANEL LAYOUT
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The Temperature Controller
The controller has a dual display, the upper display indicates the nominal block temperature, and
the lower display indicates the desired temperature or setpoint.
Altering the Setpoint
To change the setpoint of the controller simply use the UP and DOWN keys to raise and lower
the setpoint to the required value. The lower display changes to indicate the new setpoint.
Press scroll button to select setpoint 1 (SP1) or setpoint 2 (SP2).
Advanced Controller Features
Setpoint Ramp Rate
By default the Dry Blocks are configured to hea t (and cool) as quickly as possible. There may
be some calibration applications where it is advantageous to limit the heating (or cooling rate).
An example might be when testing bimetallic thermostats, by forcing the Dry Block to heat at a
controlled rate it is easier to determine the temperature at which the thermostat changes state.
The Dry Block can have its heating rate limited with the Setpoint Ramp Rate feature. This feature
is accessed from the Scroll key. Depress the key until the display shows,
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SPrr
On the Upper Display, the lower display will show the current value from OFF (default) to 999.9.
The desired rate is set here with the UP and DOWN keys, the units are °C/min.
When the SP rr is active the controller display will show "RUN", the lower setpoint display will
now automatically update with th e current value, known as the working setpoint. The setpoint
can be seen by pressing either the UP and DOWN key.
The Setpoint ramp rate operates when the bath is heating and cooling.
Instrument Address
The controller has a configurable "address" which is used for PC co mmunications. Each
instrument has an address, this allows several inst ruments to be connected in parallel on the
same communications bus. The default value is 1. This address would only need to be changed
if more than one Dry Block is connected to the same PC port.
To check the Address value press the scroll key until the top display indicates,
Addr
The lower display will show the current value that can be modified with the UP and DOWN keys.
Monitoring the Controller Status
A row of beacons indicate the controllers status as follows,
OP1
OP2 Cool Output (Only for models which operate below 0°C)
REM
Units
Momentary pressing the Scroll key will show the controller units °C or °F.
The Temperature Indicator (Not Basic (B) Models)
The site models include an electronic temperature indicator. The indicator can be configured for
the desired sensor type, and for custom calibration data. The customer calibration data can be
set ON or OFF.
Heat Output
This beacon indicates activity on the PC interface
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Setting the Input Type
A 100 Ohm resistance thermometer can be connected to the PRT Connector or a thermocouple
may be connected to the miniature TC Connector.
Ensure that only a PRT or a TC is connected at any one time. If a PRT and TC are
connected simultaneously the indicator will read in error.
Check that any sensor placed into the Medusa is suitable for the temperature range. Sensors
can be damaged if taken outside their normal operating limits.
The desired sensor type is easily set, press the Scroll key until the upper display indicates,
inPt
On the upper display. The lower display will show the current set sensor type,
J.tc J thermocouple
K.tc
L.tc
r.tc R thermocouple (Pt/Pt13%Rh)
b.tc
n.tc
t.tc T thermocouple
S.tc
PL.2
rtd 100 platinum resistance thermometer.
T012
Again the value can be modified with the UP and DOWN keys.
Enabling / Disabling Custom Calibration
Custom calibration allows the indicator to be programmed to suit a particular temperature sensor.
This allows the indicator to automatically show the true temperature, without having to manually
apply a correction.
K thermocouple
L thermocouple
B thermocouple (Pt30%Rh/Pt6%Rh)
N thermocouple
S thermocouple (Pt/Pt10%Rh)
PL 2 thermocouple
E thermocouple
When the Custom or User Calibration is active the indicator will show the REM b eacon lit
continuously. The use of User calibratio n can make a significant difference to the accuracy of
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the instrument, and this REM beacon provides a clear and continuous indication of the calibration
status. Iso tech will configure and set user calibration when the Dry Block is ordered with a
temperature sensor.
To alter the calibration status press the Scroll key until the upper display shows,
CAL
The lower display will indicate either,
USEr
Or
FACt
Use the UP and DOWN keys to toggle between the two values.
for user calibration
for factory calibration of the indicator, i.e. User Cal OFF
When calibrating an unknown sensor against a calibrated probe it may be necessary to switch
the calibration off for the unknown, and on for the calibrated probe.
Instrument Address
Like the con tro ller, the indicator has a configurable "address" which is used for PC
communications. Each i nstrument has an address; this allows several instruments to be
connected in parallel on the same communications bus. The default value is 2 (The controller
defaults to 1). This address wo uld only need to be changed if more than one Dry Block is
connected to the same PC port.
To check the Address value press the scroll key until the top display indicates,
Addr
The lower display will show the current value that can be modified with the UP and DOWN keys.
Monitoring the Indicator Status
For the indicator the REM beacon is lit continuously when the user calibration is active, the REM
beacon flashes when the PC communications port is active.
Units
Momentary pressing the Scroll key will show the controller units °C or °F.
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Advanced Indicator Operation
The indicator can be configured with up to five custom calibration points; the points contain "data
pairs". First the temperature (point) and secondly the Error (offset) at this temperature point.
Isotech Dry Block calibration certificates will show the values to suit a particular sensor.
These values can be inspected, and modified with the following procedure,
Press the PAGE key until the display indicates,
ACCS
LiSt
Press the SCROLL key until the display shows,
Goto
OPEr
Press the UP key until the display shows
Goto
conF
Press the Scroll Key twice, when the display will show,
inSt
Conf
Press the Page Key until the controller shows
CAL
Conf
Now use the Scroll key to examine the data pairs. The values can be modified with the UP and
DOWN keys.
To exit this mode press the Page key until the top display shows,
Exit
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And th en set t he lower display to YES. While in this mode take care not to modify other
parameters - a full list of all the parameters can be found in appendix 3.
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CALIBRATION DATA EXAMPLE
A maximum of five points may be entered, shown as Pnt 1 to Pnt 5 for the temperature point and
Ofs 1 to Ofs 5 for the offset values.
The Pnt values must be entered in ascending order.
Set a Pnt to a value lower than the previous point to disable it.
The indicator would be programmed with the following data:
Pnt 1 100
Pnt 2 300 Ofs 2 1.1
Pnt 3 500 Ofs 3 2.1
Pnt 4 -999
Pnt 5 -999 Ofs 5 0
Ofs 1 0.8
Ofs 4 0
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CONNECTING A CURRENT TRANSMITTER (UP TO 20MA)
The transmitter should be powered externally, a 2.49 current sense resistor is fitted internally
and this allows the indicator to read mA.
1.
2. Access configuration level.
SELECTING CONFIGURATION LEVEL
From the input type menu select “mV”.
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Testing Thermostats
The Site model can be used the Isotech Cal Notepad software for the testing of thermostats and
other thermal switches with volt free co n ta ct s. Ca l Notepad can capture the temperature at
which a switch opens or closes. It can also perform a hysteresis test. Refer to the Cal Notepad
manual for details. Ensure only voltage free contacts are connected. Do not allow any voltage
signal to be connected - doing so many damage the equipment and present a safety hazard.
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MEDUSA 510/511 SERIES
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OPERATING THE MEDUSA 511
The Medusa 511 is a 3 Zone Block Bath used to create an even temperature profile along the
part of the block in which fixed point cells will sit.
The main heater is used to set the required temperature the top and bottom heaters are used to
compensate for the end effect heat losses.
The top and bottom heater control settings are preset for the Aluminium Point - unless the
Medusa is supplied with an alternative ITS-90 fixed point.
To change the offsets (e.g for tin and indium points) the offsets may need to be reduced. The
offsets are simply changed with the up and down buttons of the respective controller.
A s a f i r s t
ap p ro xi ma tion the
o ffset s m a y b e
reduced proportionally
with temperature.
Offsets may be checked and optimized by
placing a small thermocoupl e adjustment
to the block. By ra i si ng and lowering t he
thermocoupl e the profile can be obtained
and t h en o p ti mise by adjustment of the
controllers.
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MEDUSA 510/511 SERIES
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Using the PC Interface
The Plus models include an RS422 PC interface and a special converter cable that allows use
with the a standard RS232 port. When using the bath with an RS232 port it is essential that this
co nvert er cable is used. Replacement cables are available from Isotech, part number
ISO-232-432. A further lead is available as an option, Part Number ISO-422-422 lead which
permits up to 5 instruments to be daisy chained together.
The benefit of this approach is that a number of calibration baths may be connected together in
a "dai
s y ch a
i n " co n
fi gu ra ti
on - and
t h e n
l i nk e d
to a s i n
g l e R S
23 2 ,
se e d i a
g ra m.
Note: The RS 422 standard specifies a maximum lead length of 1200M (4000ft). A true RS422
port will be required to realise such lead lengths. The Isotech conversion leads are suitable for
maximum combined lead lengths of 10M that is adequate for most applications.
Connections
For RS232 use simply connect the Isotech cable, a 9 to 25 pin converter is included to suit PCs
with a 25 pin serial converter.
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MEDUSA 510/511 SERIES
HANDBOOK
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RS422 Connections
Pin
4 Tx+ A
5
8
9 Rx- B
1
Using the Interface
The models are supplied with Cal NotePad as standard. This easy to use package is compatible
with MS Windows 9x. A handbook for Cal NotePad can be found on the first installation disk in
Adobe PDF format. If required a free Ado b e PDF reader can be downloaded from,
www.adobe.com.
CAL NOTEPAD
Connection
Tx- B
Rx+ A
Common
Cal Note p ad ca n be used to log and display values from the Dry Blocks and an optional
temperature indicator.
Minimum System Requirements
CNP requires Windows 95 / 98, a minimum of 5Mb of free hard drive space and free serial ports
for the instruments to be connected.
Dev elopment
CNP was developed by Isothermal Technology using LabVIEW from National Instruments.
License
Use of the Cal NotePad software program "CNP" is as granted in this license agreement. In using
the CNP
software the user "licensee" is agreeing to the terms of the license. You must read and understand
the terms of this license before using CNP.
1, This license permits licensee to use CNP software on a single computer. The user may make
copies for back up and archival purposes freely as long as the software is only ever in use on a
single computer at any one time. Please enquire about multi-user licenses.
2, CNP is protected by international copyright laws and treaties. CNP must not be distributed to third
parties.
3, CNP must not be reversed engineered, disassembled or de-compiled. Licensee may transfer the
software to a third party provided that no copies or upgrades of CNP are retained.
4, It is the responsibility of the user to ensure the validity of all stored results and printed certificates.
Isothermal Technology Ltd accept no responsibility for any errors caused by inappropriate use,
incorrect set up or any other cause; including defects in the software.
5, Limited Warranty. Isothermal Technology warrants that CNP will perform substantially a s
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described in this manual for a period of 90 days from receipt. Any distribution media will under
normal used be guaranteed for a period of 90 days.
NO OTHER WARRANTIES, EXCEPT AS STATED ABOVE. The software and documentation is
provided "as is" without warranty of any kind and no other warranties (either expressed or implied)
are made with regard to CNP. Isothermal Technology does not warrant, guarantee or make any
representations regarding the use or results of the use of the software or documentation and does
not warrant that the operation of CNP will be error free.
In no event will Isothermal Technology, its employees, agents or other associated people be liable
for direct, indirect, incidental or c onsequential damages, expenses, lost profits, business
interruption, lost business information or other damages arising out the use or inability to use CNP.
The license fee reflects this allocation of risk.
CNP is not designed for situations where the results can threaten or cause injury to humans.
Page 41 of 54
Installing Cal NotePad
MEDUSA 510/511 SERIES
HANDBOOK
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1
2
3.
4 Should you ever need to uninstall the software then use the Add/Remove Programs
Starting Cal NotePad
From a Standard Installation:
Click the START button
Highlight PROGRAMS
Select I so
tech - Sel
e c t Cal
pad
Insert CNP DISK 1 into the disk drive
Click on the START button on the task bar, select RUN, type A:\SETUP (Where A: is your
drive letter) then click OK
Follow the prompts which will install the application and necessary LabVIEW run time
support files.
option from the Control Panel.
Protocol
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The instruments use the "Eurotherm EI BiSynch Protocol"
If required, e.g. for writing custom software the technical details are available from our website
at, www.isotech.co.uk/refer.html
Diagnostic alarms
These indicate that a fault exists in either the controller, indicator or the connected sensor.
Controller Error Messages
The instruments include powerful diagnostics and in the unlikely event of an internal failure, or
a sensor error, one of the following error messages may be displayed.
Display
show s
EE.Er Electrical ly Erasable Memory Error:
S.br Sensor Break:
HW.Er Hardw are error :
LLLL Out of Di splay range, low reading For Controller: Contact Isotech
HHHH Out of Display range, hi gh readi ng For Controller: Contact Isotech
What it means What to do about it
For Controller: Contact Isotech
The value of an operator or
configuration parameter has been
corrupted
Input sensor is unreliable or the input
signal is out of range.
Indication that a module is of the wrong
type, missing or faulty
For Indicator: Check Config
Against Data in Appendix
For Controller: Contact Isotech
For Indicator: Check a sensor is
connected.
Check that only a PRT or a TC is
Connected (Not both)
Contact Isotech
For Indicator: Check Sensor and
Connections
For Indicator: Check Sensor and
Connections
Err1 Error 1: ROM self-test fail Consult Isotech
Err2 Error 2: RAM sel f-test fail Consult Isotech
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MEDUSA 510/511 SERIES
Err3 Error 3: Watchdog fail Consult Isotech
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ISSUE 10 - 11/05
Err4 Error 4: Keyboard failure
Stuck button, or a button was pressed
during power up.
Err5 Error 5: Input ci rcuit fai lure Consult Isotech
Pwr.F Power fai l ure. The line voltage is too
low
INITIAL TESTING
This unit was fully tested befo re de spa t ch to you but please check its operation as outlined
below.
After connecting the Medusa to the electricity supply, the temperature controller display
will show the temperature of the block and the last set-point value. The controller and
indicator both go through a self-test sequence first.
Change the set-point to 100C and observe that the block temperature rises and settles to this
value. Place a thermometer in the insert in the block and connect it to the suitably configured
indicator. Confirm that the indicator agrees within ±2C of the controller.
Switch the power off and then on
without touching any of the
controller buttons.
Check that the supply to the
controller is within the rated limits
Your unit should have performed as described above and can now be used for calibration.
If any probl ems or faults arise during these tests please contact us or our agents for help and
advice.
IMPORTANT NOTICE
The controller's function settings are preset and will not require adjustment.
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MAINTENANCE
Maintenance is limit to keeping the apparatus and the calibration volume clean and free from
debris.
There are no internal user serviceable parts.
Repair and maintenance must be carried out by Isothermal Technology Limited or an approved
agent.
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FIGURE 2
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A
B Timer
C Temperature indicator
D
E T/C input
F Power entry module - comprising power
G Timer
H Switch contact
Note: Only co n ne ct a therm oco u ple o r pl atinu m
resistance thermometer to the input con ne ct ors. Ensure
that only one sensor is connected at any time.
Temperature
PRT input
input, fuse and switch
FIGURE 3
511 3 ZONE VERSION - 110V VERSION
controller
socket
socket
enable/disable
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A Temperature controller
B
C Temperature indicator
D PRT input socket
E
F RS 422 comms socket
G On/Off switch
H Cable entry gland
I Switch contact (thermostat)
J
K Top zone controller
L Bottom zone controller
Timer
T/C input socket
Timer enable/disable
MEDUSA 510/511 SERIES
HANDBOOK
ISSUE 10 - 11/05
Note: Fuses and fuse carriers mounted internally. Accessed by removing the ye l low cover.
Factory set as: 110 Volt - Live - 20A Fuse, 0 Volt - Neutral - Link (can be exchanged for fuse
if required)
APPENDIX 1
MEDUSA SERIES
TROUBLE SHOOTING
1.
2. Indicator reads incorrectly
Unit fails to operate
Check fuse. If fuse blows repeatedly consult Isotech or local agent.
Two sensors connected simultaneously.
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MEDUSA 510/511 SERIES
Indicator incorrectly configured - refer to ‘Operating the Medusa’ section.
HANDBOOK
ISSUE 10 - 11/05
3.
Cannot establish PC Communications
For RS232 you must use the Isotech adaptor cable.
Ensure the addresses of the controller and indicator match those set in Cal Notepad.
Ensure each controller and indicator are set to a unique address.
Refer to ‘Using the PC Interface’ section and the Cal Notepad manual for further details.
APPENDIX 2
ACCESSORIES PARTS LIST FOR MEDUSA 510
Standard Dry Block Insert 510-06-01
Blank Insert
510-06-02
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Adjustable Equalising Block
Blackbody Target Kit 510-06-05
Surface Sensor Calibrator Kit 580-06-06
Surface Sensor Probe
Surface Sensor Insert 510-02-02
Slim Gallium Melting Point CellM 17401M
Slim Indium Fixed Point Cell M 17668M
Slim Tin Fixed Point Cell
Slim Lead Fixed Point Cell M 17670M
Slim Zinc Fixed Point Cell M 17671M
M 17669M
510-06-04
935-14-49
ACCESSORIES
Semi-Standard PRT
Inconel Cell Basket 510-05-00
Storage Case 931-22-58
935-14-95/DB
APPENDIX 2
ACCESSORIES PARTS LIST FOR MEDUSA 511
Page 50 of 54
Adjustable Equalising Block 511-06-04
MEDUSA 510/511 SERIES
HANDBOOK
ISSUE 10 - 11/05
Blackbody Target Kit
Surface Sensor Calibrator Kit 511-06-06
Surface Sensor Probe 935-14-49
Surface Sensor Insert
Slim Indium Fixed Point Cell M 17668M
Slim Tin Fixed Point Cell M 17669M
Slim Lead Fixed Point Cell M 17670M
Slim Zinc Fixed Point Cell
Slim Aluminium Fixed Point CellM 17672M
ACCESSORIES
511-06-05
510-02-02C
M 17671M
Semi-Standard PRT 935-14-95/DB
Inconel Cell Basket
Storage Case 931-22-58
511-05-01
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APPENDIX 3
INDICATOR CONFIGURATION (Reference Only)
Config.INST
Name Description Value
unit Instrument Units `C (0)
dEcP Decimal Places in Display NN.NN
CtrL Control Type PID (0)
Act Control Action REV (0)
COOL Cooling Type LIN (0)
PwrF Power Feedback Enable OFF (0)
Pdtr Manual/Auto Transfer PD
Control
FoP Forced Output Enable NO (0)
Sbrt Sensor Break Type SB.OP (0)
rnGH Process Value High Limit 670
rnGL Process Value Low Limit 0.00
MEDUSA 510/511 SERIES
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ISSUE 10 - 11/05
NO (0)
Config.IP
Config.CAL
Name Description Value
inPt Linearisation Type RTD
CJC CJC Type EXT
imP Sensor break impedance AUTO (1)
Name Description Value
UCAL User Calibration Enable YES (1)
Pnt1 User Cal Point 1 0
Pnt5 User Cal Point 5 -99.00
OFS1 User Cal Offset 1 0.00
Pnt2 User Cal Point 2 -99
OFS2 User Cal Offset 2 0.00
Pnt3 User Cal Point 3 -99
OFS3 User Cal Offset 3 0.00
Pnt4 User Cal Point 4 -99.00
OFS4 User Cal Offset 4 0.00
OFS5 User Cal Offset 5 -99.00
Note: User Cal values are unique to each instrument. If available set values to those from
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calibration certificate
Config.AL
Name Description Value
AL_1 Alarm 1 Type OFF (0)
Ltch1 Alarm 1 Latching NO (0)
AL_2 Alarm 2 Type OFF (0)
Ltch2 Alarm 2 Latching NO (0)
AL_3 Alarm 3 Type OFF (0)
Ltch3 Alarm 3 Latching NO (0)
AL_4 Alarm 4 Type OFF (0)
Ltch4 Alarm 4 Latching NO (0)
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Config.HA
Config.1A
Config.2A
Name Description Value
id Module Identity CMS (7)
Func Module Function CMS (65)
bAud Baud Rate 9600 (0)
Prty Comms Parity NONE (0)
rES Comms Resolution FUL (0)
Name Description Value
id Module Identity LOG (3)
Func Module function NONE (0)
SEnS Sense of Output NOR (0)
Name Description Value
id Module Identity LOG (3)
Func Module function NONE (0)
SEnS Sense of Output NOR (0)
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