Isotech MEDUSA 511 Operating Manual

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: [phone]
Fax: [phone]

www.isotechna.com

[e-mail]

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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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: [phone]
Fax: [phone]

www.isotechna.com

[e-mail]

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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.

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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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