Ametek Jofra CTC-1205 A User manual

Reference Manual
Compact Temperature Calibrator
Jofra CTC-155/350/652/660/1205 A/C

Reference Manual
Compact Temperature Calibrator
JOFRA CTC-155/350/652/660/1205 A/C
Copyright 2016 AMETEK Denmark A/S

129375 06 2019-12-06 2
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 11 sections 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.
•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
Conditions and actions that may compromise the safe use of the
instrument and result in considerable personal or material damage.
Caution…
Conditions and actions that 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.

129375 06 2019-12-06 3
List of contents
1.0 Introduction.............................................................................................................................. 4
1.1 Warranty................................................................................................................................................5
1.2 Receiving the Compact Temperature Calibrator...................................................................................6
1.3 Dimensioning drawing...........................................................................................................................7
2.0 Safety instructions................................................................................................................... 8
3.0 Setting up the calibrator for use............................................................................................11
3.1 Preparing the calibrator.......................................................................................................................11
3.2 Choosing an insertion tube .................................................................................................................13
3.2.1 Standard insertion tubes ........................................................................................................13
3.3 Inserting the sensor.............................................................................................................................14
3.4 External reference sensor...................................................................................................................16
4.0 Calibrator Interface.................................................................................................................17
4.1 Keypad - Functions .............................................................................................................................17
4.2 Display - Functions..............................................................................................................................17
4.2.1 Main screen temperature values............................................................................................17
4.2.2 Stability of temperature values...............................................................................................18
4.3 Input/Output Connections ...................................................................................................................19
5.0 Operating the calibrator..........................................................................................................20
5.1 Operating principle..............................................................................................................................20
5.1.1 System menu..........................................................................................................................21
5.2 Starting the calibrator..........................................................................................................................23
5.3 Selecting a TRUE – reference sensor (C-models only)......................................................................23
5.4 Stability setting ....................................................................................................................................25
5.5 Selecting the set-temperature.............................................................................................................25
5.5.1 Editing the preset set-temperature.........................................................................................26
5.6 Auto Step function...............................................................................................................................28
5.6.1 Running an Auto Step test .....................................................................................................28
5.6.2 The calibrator's Auto Step procedure.....................................................................................29
5.7 Switch Test function............................................................................................................................31
5.7.1 Running a Switch Test ...........................................................................................................31
5.7.2 The calibrator's Switch Test procedure..................................................................................33
6.0 Storing and transporting the calibrator.................................................................................34
7.0 Error messages (List of alarms).............................................................................................37
8.0 Returning the calibrator for service.......................................................................................41
9.0 Maintenance............................................................................................................................43
9.1 Replacing the main fuses....................................................................................................................43
9.2 Maintenance mode..............................................................................................................................44
9.3 Cleaning ..............................................................................................................................................49
9.4 Adjusting and calibrating the instrument.............................................................................................50
9.5 Maintenance of STS-reference sensor ...............................................................................................50
10.0 Technical specifications........................................................................................................51
11.0 List of accessories..................................................................................................................63

129375 06 2019-12-06 4
1.0 Introduction
Congratulations on your new AMETEK JOFRA CTC Calibrator!
With the AMETEK JOFRA Compact Temperature Calibrator, you have chosen an extremely
effective instrument which we hope will live up to all your expectations.
This CTC calibrator is a fast, timesaving, and reliable true industrial temperature calibrator
designed for on-site use.
During the past several 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 CTC-155 A – Temperature calibrator
•JOFRA CTC-155 C – Temperature calibrator with reference sensor input
•JOFRA CTC-350 A – Temperature calibrator
•JOFRA CTC-350 C – Temperature calibrator with reference sensor input
•JOFRA CTC-652 A – Temperature calibrator
•JOFRA CTC-652 C – Temperature calibrator with reference sensor input
•JOFRA CTC-660 A – Temperature calibrator
•JOFRA CTC-660 C – Temperature calibrator with reference sensor input
•JOFRA CTC-1205 A – Temperature calibrator
•JOFRA CTC-1205 C – Temperature calibrator with reference sensor input
The calibrator has the following features and functions:
• Wide temperature range
• Fast heating and cooling time as well as a short stabilization time
• Signal input for external reference sensor, which makes it possible to improve accuracy even
more.
• External sensor control for running in two modes.
• Multi-Information colour Display and Function keys
• Useful features such as Set function, Preset mode, Auto Switch Test and Auto Stepping
• IRI – Intelligent Recalibration Information
• Plug and play STS reference sensors with memory chip
• Broad range of inserts
• Reference sensor protection
• Silent mode operation
• JOFRACAL calibration software
• Protective carrying case with compartments for inserts, cables, manuals, plugs etc.

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ISO-9001 certified
AMETEK Denmark A/S was ISO
-9001 certified in September 1994 by Bureau Veritas
Certification Denmark.
CE-label
Your new temperature calibrator bears the CE label and conforms to the
Electromagnetic Compatibility (EMC) Directive 2014/30/EU, the Low Voltage
Directive 2014/35/EU, the RoHS Recast (RoHS II) Directive 2011/65/EU* and
the RoHS Recast (RoHS III) Directive 2015/863/EU.
Technical assistance
Please contact the dealer from whom you acquired the instrument if you require technical
assistance.
1.1 Warranty
This instrument is warranted against defects in workmanship, material and design for two (2)
years from date of delivery to the extent that AMETEK will, at its sole option, repair or replace
the instrument or any part thereof which is defective, provided, however, that this warranty shall
not apply to instruments subjected to tampering or, abuse, or exposed to highly corrosive
conditions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES WHETHER EXPRESS OR
IMPLIED AND AMETEK HEREBY DISCLAIMS ALL OTHER WARRANTIES, INCLUDING,
WITHOUT LIMITATION, ANY WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR
MERCHANTABILITY. AMETEK SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, ANY ANTICIPATED OR
LOST PROFITS.
This warranty is voidable if the purchaser fails to follow any and all instructions, warnings or
cautions in the instrument’s User Manual.
If a manufacturing defect is found, AMETEK will replace or repair the instrument or replace any
defective part thereof without charge; however, AMETEK’s obligation hereunder does not
include the cost of transportation, which must be borne by the customer. AMETEK assumes
no responsibility for damage in transit, and any claims for such damage should be presented
to the carrier by the purchaser.
* CTC-155 A / CTC-155 C from serial no. xxxxxx-00237, CTC-350 A / CTC-350 C from serial no. xxxxxx-00132, CTC-660 A / CTC-660 C from serial no. xxxxxx-
00211 and CTC-1205 A / CTC-1205 C from serial no. xxxxxx-00001

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1.2 Receiving the Compact Temperature Calibrator
When you receive the instrument…
1) Unpack and check the calibrator and the accessories carefully.
2) Check the parts according to the list shown below.
If any of the parts are missing or damaged, please contact the dealer who sold
you the calibrator.
You should receive:
•1 CTC Calibrator
•1 USB memory stick containing electronic Reference manual and software
package JOFRACAL
•1 mains cable
•1 sets of test leads and test clips (black and red)
•Thermal protection shield (CTC-652/660 only)
•1 tool for insertion tube
•1 USB cable
•1 Calibration certificate (International traceable)
When reordering, please specify the part numbers according to the list of accessories,
section 11.0

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1.3 Dimensioning drawing

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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.
Disposal – WEEE Directive
These calibrators contain Electrical and Electronic circuits and must be recycled or
disposed of properly (in accordance with the WEEE Directive 20
1
2/
1
9/E
U
).
Warning
About the use:
•The calibrator must not be used for any purposes other than those described in
this manual, as protection provided by the calibrator may be impaired and it might
cause a hazard.
•The calibrator has been designed for indoor use only and is not to be used in
wet locations.
•The calibrator is not to be used in hazardous areas, where vapour or gas leaks,
etc. may constitute a danger of explosion.
•The calibrator is not designed for operation in altitudes above 2000 meters (CTC-
155/350/652/660) / 3000 meters (CTC-1205).
• The calibrator is a CLASS I product and must be connected to a mains outlet with
a protective earth connection. Ensure the ground connection of the calibrator is
properly connected to the protective earth before switching on the calibrator.
Always use a mains power cable with a mains plug that connects to the protective
earth.
•To ensure the connection to protective earth any extension cord used must also
have a protective earth conductor.
•Only use a mains power cord with a current rating as specified by the calibrator
and which is approved for the voltage and plug configuration in your area.
•Always make sure to position the power cord and other connected cables in a
secure way to prevent the risk of personnel falling.
•To prevent the calibrator from tipping over and causing damage to equipment or
systems, please avoid pulling the cables connected to the calibrator.
•Before switching on the calibrator make sure that it is set to the voltage of the
mains electricity supply.
•Always position the calibrator to enable easy and quick disconnection of the
power source (mains inlet socket).
•The calibrator must be kept clear within an area of 20 cm on all sides and 1 metre
above the calibrator due to fire hazard.
•After transport or storage in humid conditions or if the calibrator has not been
heated up to minimum 100°C within the last 10 days, the instrument needs to be
operated with a well temperature of at least 140°C for 2 hours before it can be
assumed to meet all safety requirements of EN61010-1(CTC-350/652/660 only).
•Never use heat transfer fluids such as silicone, oil, paste, etc. in the dry-block
calibrators. These fluids may penetrate the calibrator and cause electrical hazard,
damage or create poisonous fumes.

129375 06 2019-12-06 9
•The calibrator must be switched off before any attempt to service the instrument
is made. There are no user serviceable parts inside the calibrator.
•When cleaning the well or the insertion tube, REMEMBER to wear goggles when
using compressed air!
•Remember to use appropriate protective equipment or get help when carrying the
calibrator (for a longer distance) in order to prevent injuries from dropping the
calibrator.
About the frontpanel:
•The connectors, on the front panel of the calibrator, must NEVER be connected to
a voltage source.
•Thermostats connected to the switch test input must not be connected to any
other voltage source during a test.
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 or personal injury.
If you intend to store the calibrator in the aluminium carrying case after use, you
must ensure that the instrument has cooled down to a temperature below
50°C/122°F before placing it in the carrying case.
•Never place a hot insertion tube in the optional carrying case.
•Use only insulation plugs supplied by AMETEK Denmark A/S.
•Never try to modify the insulation plugs to make them fit the sensor (CTC-1205
only)
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 have the specified current and voltage rating and be of
the specified type. The use of makeshift fuses and the short-circuiting of
fuse holders are prohibited and may cause a hazard.
Caution – Hot surface
This symbol is visible on 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 and cause burns.
•Do not touch the tip of the sensor when it is removed from the insertion tube/well
– it may be very hot and cause burns.
•Do not touch the handle of the calibrator during use – it may be very hot and
cause burns.
•Over 50°C/122°F
If the calibrator has been heated up to temperatures above 50°C/122°F, you must
wait until the instrument reaches a temperature below 50°C/122°F before you
switch it off.
•Do not remove the insert from the calibrator before the insert has cooled down to
less than 50°C/122°F.

129375 06 2019-12-06 10
Caution – Cold surface
Below 0°C/32°F (applies only to the CTC-155 C models)
•
Do not touch the well or insertion tube when these are below 0°C/32°F - they
might create frostbite.
•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 the material surfaces
to oxidize
To prevent this from happening the insertion tube and the well must be dried. This
is done by heating up the calibrator to 100°C/212°F until all water left has
evaporated.
Remove the insulation plug while heating up.
It is very important that humidity in the well and insertion tube is removed to
prevent corrosion and frost expansion damages.
Caution…
About the use:
•Do not use the instrument if the internal fan 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 and dry before use.
•Do not pour any form of liquids into the well. It might damage the well or cause
a hazard.
•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 350°C (662°F) / 650°C (1202°F) / 660°C
(1220°F) / 1205°C (2201°F) for a period of minimum 30 minutes (CTC-
350/652/660/1205 only).
•The insertion tube must always be removed from the calibrator after use.
The humidity in the air may cause corrosion oxidation on the insertion tube
inside the instrument. There is a risk that the insertion tube may get stuck if this
is allowed to happen.
• If the calibrator is to be transported, the insertion tube must be removed from
the well to avoid damage to the instrument. If the insertion tube is not removed
from the CTC
-
1205 the ceramic well might crack.
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 instructions set out
in this manual or uses unauthorised spare parts.

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3.0 Setting up the calibrator for use
3.1 Preparing the calibrator
Warning
•The calibrator has been designed for indoor use only and is not to be used in
wet locations.
•The calibrator is not to be used in hazardous areas, where vapour or gas leaks,
etc. may constitute a danger of explosion.
•The calibrator is not designed for operation in altitudes above 2000 meters / 3000
meters (CTC-1205).
•The calibrator is a CLASS I product and must be connected to a mains outlet with
a protective earth connection. Ensure the ground connection of the calibrator is
properly connected to the protective earth before switching on the calibrator.
Always use a mains power cable with a mains plug that connects to the protective
earth.
•To ensure the connection to protective earth any extension cord used must also
have a protective earth conductor.
•Only use a mains power cord with a current rating as specified by the calibrator
and which is approved for the voltage and plug configuration in your area.
•Always make sure to position the power cord and other connected cables in a
secure way to prevent the risk of personnel falling.
•To prevent the calibrator from tipping over and causing damage to equipment or
systems, please avoid pulling the cables connected to the calibrator.
•Before switching on the calibrator make sure that it is set to the voltage of the
mains electricity supply.
•Always position the calibrator to enable easy and quick disconnection of the
power source (mains inlet socket).
• The calibrator must be kept clear within an area of 20 cm on all sides and 1 metre
above the calibrator due to fire hazard.
•After transport or storage in humid conditions or if the calibrator has not been
heated up to minimum 100°C within the last 10 days, the instrument needs to be
operated with a well temperature of at least 140°C for 2 hours before it can be
assumed to meet all safety requirements of EN61010
-
1(CTC
-
350/652/660 only
).
Note…
The instrument must not be exposed to draughts.
When setting up the calibrator, you must…
1
Place the calibrator on an even horizontal surface where you intend to use it.
Caution…
Do not use the instrument if the internal fan is out of order.

129375 06 2019-12-06 12
2
Ensure a free supply of air to the internal fan located at the bottom
of the instrument (pos. 2). The area around the calibrator should be
free of draught, dirt, flammable substances etc
.
3
Check that the fuse size corresponds to the applied voltage on (pos.
3). The fuse is contained in the power control switch (on/off switch
(230V/115V)). To check; do as follows (see Fig. 1):
Warning
The two main fuses must have the specified current and voltage rating and be of the
specified type. The use of makeshift fuses and the short-circuiting of fuse holders are
prohibited and may cause a hazard.
A. Open the fuse box lid using a screwdriver.
B. Take out the fuse box.
C. Remove both fuses replacing them with two new fuses. These must be identical
and should correspond to the line voltage. See section 11.0.
D. Slide the fuse box back into place.
4
Check that the earth connection for the instrument is present and attach the cable.

Select an insertion tube with the correct bore diameter. See section 3.2 for information
on how to select insertion tubes.
The calibrator is now ready for use.
Fig. 1
Changing fuses

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3.2 Choosing an insertion tube
Caution…
To get the best results out of your calibrator, the insertion tube dimensions, tolerance
and material are critical. We highly advise using the JOFRA insertion tubes, as they
guarantee trouble free operation. Use of other insertion tubes may reduce
performance of the calibrator and cause the insertion tube to get stuck.
Caution…
Before using new insertion tubes for the calibration in the CTC-350/652/660/1205
instruments the insertion tubes must be heated up to maximum temperature
350°C(662°F) / 650°C (1202°F) / 660°C (1220°F) / 1205°C (2201°F) for a period of
minimum 30 minutes.
Insertion tubes are selected on the basis of the diameter of the sensor to be calibrated.
Use the table for insertion tubes in section 3.2.1 to find the correct parts number.
Alternatively, you may order an undrilled insertion tube and drill the required hole yourself. The
finished dimension should be as follows:
•Sensor diameter ød +0.2mm +0.05 / -0.00mm for CTC-155/350/652/660 and ød +0.5mm
±0.05mm for CTC-1205.
•Reference sensor hole ø4.2mm +0.05 / -0.00mm for CTC-155/350/652/660 and ø5.0mm
±0.05mm for CTC-1205.
•When drilling the holes it is important that the distance of the material between the drillings
is at least 2mm. If the distance is less than 2 mm the calibration result could be
compromised.
3.2.1 Standard insertion tubes
Caution…
To get the best results out of your calibrator, the insertion tube dimensions,
tolerance and material are critical. We highly advise using the JOFRA insertion
tubes, as they guarantee trouble free operation. Use of other insertion tubes may
reduce performance of the
calibrator and cause the insertion tube to get stuck.

129375 06 2019-12-06 14
The CTC-155 and the CTC-1205 single-hole insertion tubes are delivered with a matching insulation plug.
* Note: Insertion tubes without reference holes.
PART NO. FOR STANDARD INSERTION TUBES – MULTI-HOLE
Description
CTC-155 CTC-350 CTC-652 CTC-660
Metric Type 1
Sensor size
3, 4, 5, 6, 9 mm and
4mm REF 129489 129491 130152 129493
Inch Type 2
Sensor size
1/8”, 3/16”, 1/4”, 3/8” and
4 mm REF 129490
129492 130153
129494
The CTC-155 multi-hole insertion tubes are delivered with matching insulation plugs.
3.3 Inserting the sensor
Before inserting the sensor and switching on the calibrator, please note the following important
warning:
Warning
•Never use heat transfer fluids such as silicone, oil, paste, etc. in the dry-block
calibrators.
These fluids may penetrate the calibrator and cause electrical hazard, damage or
create poisonous fumes.
•Never try to modify the insulation plugs to make them fit the sensor. Use only
insulation plugs supplied by AMETEK Denmark A/S
.
PARTS NO. FOR STANDARD INSERTION TUBES – SINGLE HOLES
Sensor
size CTC-155
CTC-
350
CTC-652
CTC-660
CTC-
1205
Sensor
size CTC-155
CTC-350 CTC-
652
CTC-660
CTC-1205
3 mm
4 mm
5 mm
6 mm
7 mm
8 mm
9 mm
10 mm
11 mm
12 mm
13 mm
14 mm
15 mm
16 mm*
18 mm*
20 mm*
129407
129408
129409
129410
129411
129412
129413
129414
129415
129416
129417
-
-
-
-
-
129429
129430
129431
129432
129433
129434
129435
129436
129437
129438
129439
129440
129441
129442
129443
129444
130156
130157
130158
130159
130160
130161
130162
130163
130164
130165
130166
130167
130168
130169
130170
130171
129459
129460
129461
129462
129463
129464
129465
129466
129467
129468
129469
129470
129471
129472
129473
129474
130015
130016
130017
130018
130019
130020
130021
130022
130023
130024
-
-
-
-
-
-
Undrilled
Undrilled/ref.
hole
1/8”
3/16”
1/4”
5/16”
3/8”
7/16”
1/2”
9/16”
5/8”
11/16”*
13/16”*
3/4”*
129418
129419
129420
129421
129422
129423
129424
129425
129426
129427
129428
-
-
-
129445
129446
129447
129448
129449
129450
129451
129452
129453
129454
129455
129456
129457
129458
130154
130155
130172
130173
130174
130175
130176
130177
130178
130179
139180
130181
139183
130182
129475
129476
129477
129478
129479
129480
129481
129482
129483
129484
129485
129486
129487
129488
130006
130007
130008
130009
130010
130011
130012
130013
130014
-
-
-
-
-

129375 06 2019-12-06 15
Insert the sensor as shown below in fig. 2.
Check that the insulation plug fits the diameter of the sensor. Otherwise replace it (CTC-
155/CTC-1205 only).
In order to spare the sensor and its connections it is recommended to use a thermal
protection shield (129264) at high temperatures (CTC-652/660 only).
Caution…
•The well and the insertion tube must be clean before use.
•Do not pour any form of liquids in the well. It might damage the well.
•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.
Caution – Hot surface
•Do not touch the grid plate, the well or the insertion tube as the calibrator is
heating up – they may be very hot and cause burns.
•Do not touch the tip of the sensor when it is removed from the insertion tube/well
– it may be very hot and cause burns.
• Do not touch the handle of the calibrator during use – it may be very hot and
cause burns.
• Do not remove the insertion tube from the calibrator before the insertion tube has
cooled down to less than 50°C/122°F.
Sensor under test
Insertion tube
Thermal protection shield
Fig. 2
Inserting sensor and
insertion tube

129375 06 2019-12-06 16
Caution – Cold surface
Below 0°C/32°F (applies only to the CTC-155 models)
•Do not touch the well or insertion tube when these are below 0°C/32°F - they might
create frostbite.
•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 the material surfaces to
oxidize
To prevent this from happening the insertion tube and the well must be dried. This is
done by heating up the calibrator to 100°C/212°F until all water left has evaporated.
Remove the insulation plug while heating up.
It is very important that humidity in the well and insertion tube is removed to prevent
corrosion and frost expansion damages.
3.4 External reference sensor
The following JOFRA STS Reference sensors can be used with the varies models:
CTC-155 CTC-350 CTC-652 CTC-660 CTC-1205
STS-102 A 030 STS-120 A 935 STS-200 A 970 STS-120 A 966 STS-TC-N-A-1205
STS-120 A 915 STS-120 A 966 STS-150 A 966
STS-150 A 912 STS-150 A 935 STS-200 A 970
STS-150 A 915 STS-150 A 966
STS-200 A 915 STS-200 A 970
STS-200 A 916
Use the configuration software CON050 supplied with CTC to program and to update
calibration information in STS sensors.
For instructions read the software manual for CON050 installed on the USB key.

129375 06 2019-12-06 17
4.0 Calibrator Interface
4.1 Keypad - Functions
4.2 Display - Functions
Function keys
F1, F2, F3, F4
To operate the horizontal
menu bar use the
Functions keys.
Arrow Keys
Serve different functions
depending on the mode of
operation.
Navigation mode: Use the
four keys to move the
cursor in the desired
direction.
Edit mode: The Up and
Down Arrow keys scroll
through the lists of options.
If entering a number, the
Left and Right Arrow keys
move the cursor one
character in the desired
direction.
Action key / Enter key
Action function: Open and
close edit fields or a menu
button. The action key also
accepts the selected
option or entered value.
Enter function: Accept
selected options or
entered values. When a
value is entered with the
Enter Key the cursor
selects the next
configurable field in the
list.
Back key
Press the key to cancel a
selection or return to
previous menu.
System menu key
Press the key to enter the
System menu.
Horizontal menu bar
Provides you with the relevant menu
options that can be selected at the
present point.
Each option can be
selected and activated by pressing the
function keys (F1, F2, F3 and F4).
True temperature
reading
Shows the numeric value
of the temperature being
measured. Can be either
the internal reference
sensor or an external
reference sensor.
Real Time Clock and
date display.
Memory reading
Shows the current
memory selected
from the System
menu.
Reference sensor info
Shows the reference sensor
selected. The serial number
of the external reference
sensor is read from the
intelligent reference sensor
and displayed in this field.
Set temperature reading
Shows the numeric value
of the current set
temperature selected.
Internal Reference
temperature reading
Shows the temperature of
the well.
Units
Shows the unit of the
current measurement.
Process Indicator
Indicates the status of the
current process.
“Time to stable”
Selection
Shows the selected
specified stability criteria
and states a time when the
stable situation can be
achieved.
Warning/Error
symbols
. See 4.2.2

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4.2.1 Main screen temperature values
Two temperatures are always displayed:
•TRUE temperature: This is the reference temperature of the calibrator. The TRUE
temperature can either be the internal reference or the external reference.
•SET temperature: This is the target temperature for the well. SET temperature displays the
last value entered. If no value has been entered previously, "---,--" is displayed.
Additional temperatures displayed:
•If External reference is selected as TRUE temperature, the temperature of the internal
reference is also displayed.
4.2.2 Stability of temperature values
The stability of the TRUE temperature is indicated by the following messages:
•"Not stable": Indicates that the measured temperature is not yet within the specified
stability criteria.
•Indicates "Time to stable": The temperature changes are within the specified stability
criteria (see section 10.0) and states a time (in minutes and seconds) when the stable
situation can be achieved.
•Indicates that the “stable” situation is achieved and for how long the calibrator has
been stable. When the calibrator has been stable for more than 99 minutes, only the
stable sign is displayed (time is no longer displayed).
•If External reference is selected as TRUE, the stability criteria will refer to this.
The criteria can be changed, however, if the temperature stability criteria is set
wider or the stability time is set shorter, the calibrator may not reach the SET
temperature.
When the instrument is heating up and cooling down indication of this will be shown as
following symbols:
•The instrument is heating up.
•The instrument is cooling down (CTC-155 only).
•The instrument is cooling down (CTC-350/652/660/1205 only).
Heating and cooling symbols will be displayed in the upper black info bar when:
•the well temperature is below 5°C.
•the well temperature is above 45°C.
Warning and error symbols will be displayed in the upper black info bar indicating that action
needs to be taken:
•Warning symbol.
•Error symbol.

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If a warning or an error symbol occurs during operation, a list of alarms will be displayed
showing the warning and/or error messages. See section 7.0 – Error messages.
Note…
A warning will always surpass an error, even if the error occurs after the warning.
4.3 Input/Output Connections
Warning
•The input terminals must NEVER be connected to voltage exceeding 30V with
reference to ground.
Device
USB 2.0 Device Port, 1 x
USB.
Reference Sensor
Input for reference
sensor.
Power Control Switch
With a cable connection
and On/Off switch. It also
contains the main fuse.
See section 3.1 for
information on how to
change the fuse. The text
above the Power Control
Switch indicates the fuse
value.
Switch Test
Connection for
thermostat switch test.
Note that this connection
is for voltage free
switches.
Fig. 3
Input and Output