Ametek JOFRA ITC-320 A User manual

Reference Manual
Temperature Calibrator
JOFRA ITC-155/320/650 A
Copyright 2002 AMETEK DENMARK A/S

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About this manual….
• The structure of the manual
This reference manual is aimed at users who are familiar with
Ametek calibrators, as well as those who are not. The manual is
divided into 10 chapters which describe how to set up, operate,
service and maintain the calibrator. The technical specifications
are described and accessories may be ordered from the list of
accessories.
Along with the calibrator, you should have received a multi-
lingual user manual which sets out the operating instructions for
the instrument. It is designed to provide a quick reference guide
for use in the field.
• Safety symbols
This manual contains a number of safety symbols designed to
draw your attention to instructions which must be followed when
using the instrument, as well as any risks involved.
Warning
Events which may compromise the safe use of
the instrument and result in considerable
personal or material damage.
Caution…
Events which may compromise the safe use of
the instrument and result in slight personal or
material damage.
Note…
Special situations which demand the user’s
attention.

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List of contents
1.0 Introduction ..............................................................................4
2.0 Safety instructions ...................................................................6
3.0 Setting up the calibrator ........................................................11
3.1 Receipt of the calibrator.............................................................. 11
3.2 Preparing the calibrator .............................................................. 13
3.3 Choice of insertion tube .............................................................. 14
3.4 Inserting the sensor .................................................................... 16
4.0 Operating the calibrator.........................................................19
4.1 Keyboard, display and connections............................................ 19
4.2 Starting the calibrator.................................................................. 22
4.3 Selecting the set-temperature .................................................... 22
4.4 Using the SWITCH TEST ........................................................... 24
4.5 Using the AUTO STEP ............................................................... 28
4.6 Using the MENU ......................................................................... 31
4.6.1 Adjusting the temperature unit ....................................... 32
4.6.2 Adjusting the max-temperature ...................................... 33
4.6.3 Adjusting the SWITCH TEST slope rate ........................ 33
4.6.4 Adjusting the extra stability time..................................... 34
4.6.5 Adjusting the temperature resolution ............................. 34
4.7 Simulation/training ...................................................................... 35
5.0 Storing and transporting the calibrator ...............................36
6.0 Errors.......................................................................................38
7.0 Setting the main voltage and replacing the fuses..............40
7.1 Returning the calibrator for service............................................. 41
8.0 Maintenance............................................................................43
8.1 Cleaning...................................................................................... 43
8.2 Adjusting and calibrating the instrument..................................... 44
8.2.1 Adjusting the calibration date ......................................... 46
8.2.2 Calibrating/adjusting the instrument............................... 47
9.0 Technical specifications........................................................51
10.0 List of accessories .................................................................59

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1.0 Introduction
Congratulations on your new Ametek Jofra ITC
Calibrator!
With the Ametek Jofra calibrator, you have chosen an extremely
effective instrument which we hope will live up to all your expectations.
Over the past many years, we have acquired extensive knowledge of
industrial temperature calibration. This expertise is reflected in our
products which are all designed for daily use in an industrial
environment. Please note that we would be very interested in hearing
from you if you have any ideas or suggestions for changes to our
products.
This reference manual applies to the following instruments:
• Jofra ITC-155 A
• Jofra ITC-320 A
• Jofra ITC-650 A
)ISO-9001 certified
Ametek Denmark A/S was awarded the
ISO-9001 certificate in September 1994 by
BVQI - Bureau Veritas Quality International.

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)CE-label
Your new calibrator bears the CE label and
conforms to the EMC directive and the Low-
voltage Directive.
)Technical assistance
Please contact the dealer from whom you acquired the instrument
if you require technical assistance.
)Guarantee
According to current terms of sale and delivery.
This guarantee only covers defects in manufacture and becomes
void if the instrument has been subject to unauthorised
intervention and/or misuse.

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2.0 Safety instructions
Read this manual carefully before
using the instrument!
Please follow the instructions and procedures
described in this manual. They are designed to
allow you to get the most out of your calibrator and
avoid any personal injuries and/or damage to the
instrument.
Warning……
About the use:
• The calibrator must not be used for any purposes
other than those described in this manual.
• The calibrator is designed for interior use only and
should not be used in risk-prone areas, where
vapour or gas leaks, etc. may constitute an
explosives hazard.
• The calibrator must be kept clear within an area of
20 cm on all sides and 1 metre above the calibrator.
• Never use heat transfer fluids such as silicone, oil,
paste, etc.
These fluids may penetrate the calibrator and cause
damage or create poisonous fumes.
• The calibrator must be switched off before any
attempt to service the instrument is made.
• When cleaning the well, REMEMBER, wear goggles
when using compressed air!
About the frontpanel:
• The switch-test connectors, on the front panel of the
calibrator, must NEVER be connected to a voltage
source.
• Thermostats must not be connected to any other
voltage source during a test.

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About insertion tubes and insulation plugs:
• Never leave hot insertion tubes which have been
removed from the calibrator unsupervised – they
may constitute a fire hazard.
If you intend to store the calibrator in the optional
aluminium carrying case after use, you must ensure
that the instrument has cooled to a temperature
below 100°C/212°F before placing it in the carrying
case.
About the fuses:
• The fuse box must not be removed from the power
control switch until the mains cable has been
disconnected.
• The two main fuses must be identical and correspond
to the chosen voltage.

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Caution – Hot surface
This symbol is engraved in the grid plate.
• Do not touch the grid plate, the well or the insertion
tube as the calibrator is heating up – they may be
very hot.
• Do not touch the tip of the sensor when it is
removed from the insertion tube/well – it may be very
hot.
• Do not touch the handle of the calibrator during use
– it may be very hot.
• Over 100°C/212°F
If the calibrator has been heated up to temperatures
above 100°C/212°F, you must wait until the
instrument reaches a temperature below
100°C/212°F before you switch it off.
Below 0°C/32°F (applies only to the ITC-155 A
model)
If the calibrator has reached a temperature below
0°C/32°F, ice crystals may form on the insertion tube
and the well. This, in turn, may cause verdigris to
form on the material.
To prevent this from happening, simply heat up the
calibrator to 50°C/122°F.

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Caution…
About the use:
• Do not use the instrument if the ventilator is out of
order.
• Before cleaning the calibrator, you must switch it off,
allow it to cool down and remove all cables.
About the well, insertion tube and grid plate:
• The well and the insertion tube must be clean before
use.
• Scratches and other damage to the insertion tubes
should be avoided by storing the insertion tubes
carefully when not in use.
• The insertion tube must never be forced into the
well. The well could be damaged as a result, and the
insertion tube may get stuck.
• Before using new insertion tubes for the calibration,
the insertion tubes must be heated up to maximum
temperature - 320°C (608°F) / 650°C (1202°F) - for a
period of minimum 30 minutes.
In order to ensure the best calibration of your
sensors please avoid using insertion tubes in the
ITC-320 calibrator which have been used in the ITC-
650 calibrator.
• The insertion tube must always be removed from the
calibrator after use.
The humidity in the air may cause verdigris to form
on the insertion tube inside the instrument. There is
a risk that the insertion tube may become stuck if
this is allowed to happen.
• If the calibrator is to be transported, the insertion
tube must be removed to avoid damage to the
instrument.

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Note…
The product liability only applies if the instrument
is subject to a manufacturing defect. This liability
becomes void if the user fails to follow the
maintenance instructions set out in this manual or
uses unauthorised spare parts.