Ametek CTC-155, CTC-350, CTC-652, CTC-660, CTC-1205 User Manual

User Manual

Compact Temperature Calibrator

Jofra CTC-155/350/652/660/1205 A/C

Test Equip

ment Depot - 800.517.8431

- 99 Was

hington Street Melrose, MA 02176 - TestEquipmentDepot.com

Use

r Manual

Compact Temperature Calibrator

JOFRA CTC-155/350/652/660/1205 A/C

 Copyright 2016 AMETEK Denmark A/S

List of contents

1.0 Introduction ................................................................................................................... 3

1.1 List of equipment received………………………………………………………………………… 3

2.0 Safety instructions ........................................................................................................ 4

3.0 Setting up the calibrator ............................................................................................... 7

3.1 Before use……………………………………………………………………………………….….. 7

3.2 Keypad - Functions…………………………………………………………………………………. 9

3.3 Display…………………………………………………………………………………………….. 10

3.4 Connections……………………………………………………………………………………… 11

3.5 Stability of temperature values…………………………………………………………………… 11

4.0 Operating the calibrator .............................................................................................. 13

.1 Operating principle…………………………………………………………………………………13

4

4.2 System menu……………………………………………………………………………………….13

4.3 Starting the calibrator…………………………………………………………………………….. 15

4.4 Selecting a TRUE – reference sensor (C-models only)………………………………………. 16

4.5 Stability setting……………………………………………………………………………………. 17

4.6 Selecting the set-temperature…………………………………………………………………… 17

4.6.1 Editing the preset set-temperature…………………………………………………….. 18

4.7 Auto Step function………………………………………………………………………………….19

4.7.1 Running an Auto Step test………………………………………………………………..19

4.7.2 The calibrator's Auto Step procedure……………………………………………………20

4.8 Switch Test function……………………………………………………………………………….21

4.8.1 Running a Switch Test…………………………………………………………...............21

4.8.2 The calibrator's Switch Test procedure………………………………………………....22

5.0 Setting the mains voltage and replacing the main fuses ......................................... 24

5.1 Replacing the main fuses……………………………………………………………..…………..24

6.0 After use ....................................................................................................................... 25

6.1 Storing and transporting the calibrator…………………………………………………………..25

6.2 Switching off the calibrator………………………………………………………………………..26

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1.0 Introduction

CTC-calibrators are temperature calibrators designed to calibrate temperature sensors and
temperature switches.

Read this manual carefully before using the instrument and make sure that all safety
instructions and warnings are observed.

1.1 List of equipment received

When you receive the instrument, the following should be enclosed:

• 1 calibrator

• 1 USB memory stick containing electronic Reference manual and software package

JOFRACAL

• 1 mains cable

• 1 set of test cables (1 black, 1 red)

• 1 thermal protection shield (CTC-652/660 only)

• 1 tool for insertion tube

• 1 USB cable

• 1 Calibration certificate (International traceable)

129591 04 2019-12-16 3

2.0 Safety instructions

instructions and warnings must be observed.

Disposal

These calibrators contain Electrical and Electronic circuits and must be recycled or

disposed of properly (in accordance with the WEEE Directive 20

hazard,

damage or create poisonous fumes.

Read this manual carefully before using the instrument!

In order to avoid any personal injuries and/or damage to the instrument all safety

– WEEE Directive

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.

12/19/EU).

• 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-155/350/660) / 3000 m (CTC-652/1205).

• 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

129591 04 2019-12-16 4

• The calibrator must be switched off before any attempt to service the instrument

holders are prohibited and may cause a hazard.

•

Do not

touch the well or insertion tube when these are below 0°C/32°F

- they

is made. There are no user serviceable parts inside the calibrator.

• When cleaning the well or 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 front panel:

• 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 the insertion tubes and insulation plug:

• 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 optional 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

Caution – Hot surface

This symbol is visible on the grid plate.

• Do not touch the grid plate, the well or the insertion tube when 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.

129591 04 2019-12-16 5

Caution – Cold surface

elow 0°C/32°F (applies only to the CTC-155 models)

B

might create frostbite.

the CTC

-

1205 the ceramic well might crack.

in this manual or uses unauthorised spare parts.

• 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 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 (CTC­350/652/660/1205 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

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

129591 04 2019-12-16 6

3.0 Setting up the calibrator

CTC

-

1205 A/C:

650 VA max.

and which is approved for the

voltage and plug configuration in your area.

ENVIRONMENTAL SPECIFICATIONS

Ambient operating temperature range: 0-50°C / 32-122°F

Storage temperature range: -20-50°C / -4-122°F

Humidity range: 5-90% RH, non-condensing

IP protection class: IP10

Altitude: 0-2000 m / 0-3000 m (CTC-1205 only)

Electromagnetic Compatibility:

Tested for use in domestic establishment and in
establishments directly connected to low voltage
power supply network which supplies buildings
used for domestic purposes as well as in an
industrial electromagnetic environment as
described in EN61326-1:2013.

POWER SUPPLY SPECIFICATIONS

Line voltage/frequency: 90-127VAC / 180-254VAC 47-63 Hz

IEC protection class: Class I

Power consumption:

CTC-155 A/C: 140 VA max.
CTC-350 A/C: 1150 VA max.
CTC-652 A/C: 1150 VA max.
CTC-660 A/C: 1150 VA max.

3.1 Before use

Warning

• The calibrator m

ust not be used for any purposes other than those described in

this manual, as 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 m (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

129591 04 2019-12-16 7

• Always make sure to position the power cord and other connected cables in a

cause burns

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 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.

• 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.

• 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).

• 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)

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 handle of the calibrator during use – it may be very hot and

.

When setting up the calibrator, you must… (cf. figure next page):

1. Place the calibrator on an even horizontal surface where you intend to use it and away
from all draughts. 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.

Caution…

Do not use the instrument if the internal fan is out of order.

2. Ensure a free supply of air to the internal fan located at the bottom of the instrument

3. Check that the fuse size corresponds to the applied voltage on (pos. 2). The fuse is

contained in the power control switch (on/off switch (230V/115V)).

129591 04 2019-12-16 8

(pos. 1). The area around the calibrator should be free of draught, dirt, flammable
substances etc.

Warning

minimum 30 minutes.

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.

4. Check that the earth connection for the instrument is present and attach the cable.

5. Place the sensor (pos. 3) in the insertion tube (pos. 4) as shown in the figure below.

Caution…

Before

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

6. In order to protect the sensor and its connections use the thermal protection shield
(129264 – pos. 5) at high temperatures (CTC-652/660 only).

using new insertion tubes for the calibration in the CTC-350/652/660/1205

129591 04 2019-12-16 9

3.2 Keypad - Functions

1

direction.

5 4 3 2 6 7 8 9

10

11

Function keys - F1, F2, F3, F4

For operating the horizontal menu.

Arrow Keys

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

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.

System menu key

Enter the System menu.

Back key

Cancel a selection or return to previous menu.

3.3 Display

1) 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).

2) Process Indicator

Indicates the status of the current process.

3) “Time to stable” Selection

Shows the selected specified stability criteria and states a time when the stable situation can be
achieved.

129591 04 2019-12-16 10

4) 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.

5) Memory reading

Shows the current memory selected from the System menu.

6) Warning/Error symbols.

If a warning or an error symbol occurs during operation, action needs to be taken.

7) Real Time Clock and date display.

8) True temperature reading

Shows the numeric value of the temperature being measured. Can be either the internal reference
sensor or an external reference sensor.

9) Units

Shows the unit of the current measurement.

10) Internal Reference temperature reading
Shows the temperature of the well.

11) Set temperature reading

Shows the numeric value of the current set temperature selected.

3.4 Connections

Device

USB 2.0 Device Port, 1 x USB.

Switch Test

Connection for thermostat switch test. Note that this connection
is for voltage free switches.

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 in the reference manual for
information on how to change the fuse. The text above the
Power Control Switch indicates the fuse value.

3.5 Stability of temperature values

he stability of the TRUE temperature is indicated by the following messages:

T

• "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 and states a time (in minutes and seconds) when the stable situation can be
achieved.

129591 04 2019-12-16 11

• 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).

ot and cold symbols will be displayed in the upper black info bar when:

H

• the well temperature is below 5°C.

• the well temperature is above 45°C.

129591 04 2019-12-16 12

4.0 Operating the calibrator

4.1 Operating principle

The calibrator is operated using the Functions keys, the Arrow keys and the
Action/Enter key.

1. Press the Functions keys to operate the horizontal menu bar.

2. Press any of the (Arrow) keys to enter Navigation Mode. Editable fields will be

highlighted in blue.

3. Use the Arrow) keys to move between the configurable fields within the

display. Selected fields will be highlighted in dark blue..

4. Press the (Enter) key to access the selected field for editing.

5. Use the (Up) and (Down) Arrow keys to select a new value.

6. Press the (Enter) key to accept the new value

7. To exit the Navigation Mode press the (Back) key. The (Back) key is also

used to cancel a selection or to return to a previous menu.

4.2 System menu

The System menu can be accessed at any stage of operation:

1. Press the (System) key to display the System menu.

2. Use the (Up) and (Down) Arrow keys to scroll in the list.

• System Settings menu

se the (Enter) key and the (Up) and (Down) Arrow keys to access

1. U

editable fields, select new values and accept new values.

129591 04 2019-12-16 13

reference sensor, if connected.

Note…

• If the current set-temperature is higher than the new max-temperature, you will

need to adjust the set-temperature. The instrument will immediately begin to cool
(if required) as soon as the new max-temperature is accepted.

• The calibration interval can be set between 1 and 99 months. When the

calibration interval is exceeded, a yellow warning symbol will appear in the
upper part of the display. The recalibration interval is not used for the external
reference sensor. The interval for this sensor is stored in the intelligent sensor.

• If the Ext. reference input setting is disabled, it will not be possible to select the

external reference or SET follows true from the Mode menu. Only the internal
reference can be selected and displayed in the main display (C-models only).

• If Silent mode is selected, the cooling speed will be reduced.

• Presets menu

1. The preset temperatures can be changed manually using the (Arrows) keys.

Note…

Temperature range is limited by Min. SET Temp. and Max. SET Temp. settings

ditable in the System Settings menu and by the temperature range of the external

e

• System Info menu

1. In the System Info menu important information such as serial numbers and

calibration dates of both the instrument and the external reference sensor are
given.

It is not possible to edit any fields in this menu.

129591 04 2019-12-16 14

• Store menu (Save Settings)

After you have configured the instrument, you can save the setup for future use
using the Store function.

1. Use the (Up) and (Down) Arrow keys to select the Memory-setup you want to

modify, and press (Save). The new configuration is now saved.

F3

2. You can change the name of the highlighted saved setup by pressing (Enter),

and then using the (Up) and (Down) Arrow keys to change the characters.

The name is limited to seven (7) characters.

3. Press to save the new name.

ecall menu

• R

F3

To recall your memory setups select the Recall function.

1. Use the (Up) and (Down) Arrow keys to to scroll in the setup-list.

2. Select the requested setup, and press (Enter).

The name of the setup will appear in the upper-left corner of the display.

If selecting the Factory default function the active setup will be reset and change to
the initial setting.

4.3 Starting the calibrator

Switch on the calibrator using the power control switch.

start up screen is displayed and then replaced with the main menu screen:

A

The functions in the horizontal menu bar are available using the Functions soft keys
F1– F4. For Operating principle – See section 4.1.

129591 04 2019-12-16 15

4.4 Selecting a TRUE – reference sensor (C-models only)

1. Press one of the (Arrow) keys and the (Enter) key to access the Mode

menu.

You can choose between one of the following sensor constellations:

• Internal reference source (A and C models)

• External reference source (C models only)

• SET follows TRUE (C-models only)

• Internal reference source

The internal reference sensor will be displayed as the TRUE value on the main
screen.

The calibrator has a set of internal stability criteria it shall meet before stability is
indicated. The stability time may be set beyond the internal stability criteria.

The stability time can be set (in minutes) using integers from 5 – 99

ternal reference source (C-models only)

• Ex

The TRUE value on the main screen will be read from the Intelligent Reference
Sensor connected to the REF. INPUT on the front panel (see section 3.4). The
calibrator automatically reads the calibration data and serial number of the Sensor.

• SET follows TRUE (C-models only)

This function enables you to reach the TRUE temperature measured by the
External reference sensor.

The TRUE value on the main screen will be read from the Intelligent Reference
Sensor connected to the REF. INPUT on the front panel (see section 3.4). The
calibrator automatically reads the calibration data and serial number of the Sensor.

129591 04 2019-12-16 16

calibrator indicates

stability.

external reference sensor, if connected.

Note…

that when “SET follow true” is selected, the calibrator will control the temperature
to the TRUE temperature. This means that it could take longer time before the

4.5 Stability setting

True: Internal reference

When internal reference is selected the calibrator uses a set of minimum internal
stability criteria that shall be met before stability is indicated.

The stability time can be adjusted from the minimum internal stability time (typical
5 min) up to 99 min.

True: External reference

When internal reference is selected the user can adjust both stability tolerance and
stability time.

The Stability tolerance can be set between 0.01°C to 1.00°C. The tolerance should
be set low enough to utilize the good temperature stability of the calibrator –
however a low value also gives a longer time to be stable.

The stability time can be set from 1 – 99 minutes.

the specified Stability time, then the stability indicator in the main screen will turn
green.

When the TRUE temperature has reached the specified Stability tolerance during

4.6 Selecting the set-temperature

Note…

Temperature range is limited by Min. SET Temp. and Max. SET Temp. settings
editable in the System Settings menu and by the temperature range of the

The set-temperature can be entered both manually and by selecting a preset
temperature.

2. For manually use press (Set)

3. Use the (Arrow) keys to enter the temperature requested.

4. Press (Enter) to accept the entered temperature.

129591 04 2019-12-16 17

F1

1. For selecting the preset temperature press (Preset).

2. Select one of the 4 temperature options available from the menu bar by pressing

the correspondent Function key (F1 – F4).

3. The set-temperature is selected, once the Function key has been pressed.

The calibrator will now heat up / cool down.

T

he starting point is the last chosen set-temperature (even if the instrument has

been switched off).

The top display continuously shows the read-temperature and the lower display
shows the set-temperature.

F2

In the top display the calibrator will indicate the estimated time in whole minutes
until the calibrator will be stable.

When the calibrator is stable the display will show a green checkmark

symbol and the instrument will emit an audible alarm. The instrument will indicate

in minutes and seconds for how long the instrument has been stable.

4.6.1 Editing the preset set-temperature

It is possible to change the preset set temperature to whatever value desired.

1. Press (Preset).

F2

2. Press one of the (Arrow) keys and an editable field displaying the preset set

temperatures appears.

3. Navigate to the set temperature field using the arrows.

129591 04 2019-12-16 18

4. Press (Enter) to access the editable field and use the arrows (Up) and

(Down) to select a new set value.

5. Press (Enter) to accept the new set value.

6. Press (Back) to return to the previous menu.

4.7 Auto Step function

Auto Step is used to step automatically between a range of different calibration

emperatures. This is useful when calibrating sensors in places which are hard to

t
reach, and when calibrating sensors for which the output is displayed in a different
location.

Note…

Temperature range is limited by Min. SET Temp. and Max. SET Temp. settings
editable in the System Settings menu and by the temperature range of the
external reference sensor, if connected.

4.7.1 Running an Auto Step test

1. Press (Auto Step) to access the Auto Step setup. If you wish to return to

F3

the Main screen press (Main).

ress one of the (Arrow) keys to access the editable fields for new values:

2. P

F1

• No of steps: the number of temperature steps per direction (T

Tx) can be

1

set using integers from 2 to 12. You must select minimum 2
steps, maximum 12 steps.

• Hold time: defines the time (in minutes) the temperature is maintained

(after it is stable) for each step.

• Step v

129591 04 2019-12-16 19

alues: must be set within the sensors permitted range.

3. Press (F4) to start the Auto Step test.

The Auto Step test is now in progress.

While the Auto Step test is in progress, 4 options are available:

• Stop : Press (F1) to stop the Auto Step test. The process will

end.
Pressing the (F4) key the process will start again running
step 1.

• Previous : Press (F2) to force the test to jump a step backwards to the

previous running step regardless of the step’s stability.

• Next : Press (F3) to force the test to jump a step forwards to the

next running step regardless of the step’s stability.

• Pause : Press (F4) to pause the test. Pressing start (F4)

again, the process will continue running from the current step.

4.7.2 The calibrator's Auto Step procedure

) Once the Auto Step test is started, the calibrator starts working towards the given

1

set-temperature. An audible alarm will be emitted once the calibrator is stable.

2) The calibrator will wait the specified amount of hold time. The instrument indicates
this by counting down the amount of time remaining.

3) The calibrator will then go to the next step. The procedure is the same as for the
first step. This process will be repeated until the last step has been executed and
the function has been completed.

4) The measured TRUE temperatures for each step are displayed during operation.

129591 04 2019-12-16 20

4.8 Switch Test function

external reference sensor, if connected.

Switch Test automatically locates the switch temperature of a thermostat.

Three parameters are required:

• Start temperature (T

• End temperature (T

)

1

)

2

• Rate of change in temperature pr. minute (Rate).

Dead band of a thermostat can also be determined here. Where the dead band
determines the tolerance between the upper switch temperature and the lower switch
temperature of the thermostat.

4.8.1 Running a Switch Test

Warning

Thermostats connected to the switch test input m

source during test.

ust not be connected to any other

Note…

Before running the Switch Test, make sure that the switch is connected to the Switch
Test input.

Note…

Temperature range is limited by Min. SET Temp. and Max. SET Temp. settings

ditable in the System Settings menu and by the temperature range of the

e

1. Press (Switch) to access the Switch Test setup. If you wish to return to the

Main screen press (Main).

F4

F1

The small graph illustrates the current T1, T2 and dead band selections. Note that
T1 can be greater than T2.

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2. Press one of the (Arrow) keys to access the editable fields for new values:

....

....

....

• T

• T

First set temperature

1 :

2 :

Second set temperature

• Dead band : To determine dead band, toggle between "Yes" (a two-way-

temperature measurement) and "No" (a one-way-temperature
measurement). A dead band result is only measured when
dead band is set to “Yes”.

• Rate : The permitted range is 0.01 - 10.0°C/min. / 0.02 - 18.0°F/min.

• Test runs: Can be set from 1 to 3 making it possible to run the test more

than once.

Note…

the Rate should be set so that the thermostat sensor can follow the

3. Press (F4) to start the Switch Test.

temperature in the calibrator's well.

The Switch test is now in progress.

While the Switch Test is in progress, 2 options are available:

• Stop : Press (F1) to stop the Switch Test. The process will end and

the results will be deleted from the results list.
Pressing the (F4) key the process will start from the
beginning heating towards T1.

Results : Press (F3) to display the current Switch Test result. The

•

....

results change as the test progresses. The results list is also
accessible from the Switch Test menu screen.

4.8.2 The calibrator's Switch Test procedure

1) Once the Switch Test is started, the calibrator starts working towards T1 as quickly
as possible. The calibrator's temperature changes (heating or cooling) and switch
status are shown in the display.

2) When T1 is achieved and the temperature is stable, the text and the graphic in the
bottom of the screen will change accordingly.

3) The calibrator now starts working towards T2 at the specified Rate.

) In a normal situation, the thermostat changes state before T2 is achieved. If T2 is

4

achieved and the temperature is stable, no results will be displayed.

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....

....

....

5) When dead band is not selected (single temperature change) (the graphic
indicates the choice), the finished switch test result is displayed.

When dead band is selected (two switch changes), the calibrator starts working
towards T1 at the specified Rate.

) Normally, the thermostat changes state before T1 is achieved. If T1 is reached and

6

the temperature is stable, no results will be displayed.

7) The finished switch test results are displayed in the results list by pressing

....

(F3).
The results show the temperature when the thermostat has closed and the
temperature when it has opened – whichever comes first. The difference between
these 2 temperatures is calculated as the dead band.

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5.0 Setting the mains voltage and replacing the main fuses

5.1 Replacing the main fuses

Warning

• The calibrator must be switched off before any attempt to service the instrument is

made. There are no user serviceable parts inside the calibrator.

• 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.

A. Locate the main fuses in the fuse box in the power control switch and check the

voltage of the power control switch (on/off switch (230V/115V)). If the voltage of
the power control switch differs from the line voltage, you must adjust the voltage
of the power control switch.

B. Open the lid of the fuse box using a screwdriver and remove the fuse box.

C. Replace the fuses. The fuses must be identical and should correspond to the line

voltage.

 CTC-155/350/652/660: 115V: 10AF/250V = 60B302, 230V:
 CTC-1205: 115V: 8AT/250V = 127211, 230V: 4AT/250V = 127210

5AF/250V =127573

If the fuses blow immediately after you have replaced them, the calibrator should
be returned to the manufacturer for service.

D. Slide the fuse box into place with the correct voltage turning upwards.

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6.0

After use

prevent corrosion and frost expansion damages.

6.1 Storing and transporting the calibrator

Warning

Caution…

The following guidelines should always be observed when storing and transporting
the calibrator. This will ensure that the instrument and the sensor remain in good
working order.

• The calibrator m

is made. There are no user serviceable parts inside the calibrator.

• 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.

The following routine must be observed before the insertion tube is removed and the
instrument switched off:

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.

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.

ust be switched off before any attempt to service the instrument

• If the calibrator has reached a temperature below 0°C/32°F, ice crystals may form

on the insertion tube and on 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 min. 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

129591 04 2019-12-16 25

6.2 Switching off the calibrator

to happen.

1. Switch off the calibrator using the power control switch.

Note that the calibration procedure may be interrupted at any time using the

power control switch. Switching off the calibrator during the calibration process
will not damage either the instrument or the sensor.

2. Remove the insertion tube from the calibrator using the tool for insertion tube
supplied with the instrument as shown in the figure.

Insertion tube

Tool for insertion tube

Caution – Hot surface

Do not

than 50°C/122°F

Caution…

• 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

129591 04 2019-12-16 26

remove the insert from the calibrator before the insert has cooled down to less

• If the calibrator is to be transported long distances, the insertion tube must be

not removed from the CTC

-

1205 the ceramic well might crack.

removed from the well to avoid damage to the instrument. If the insertion tube is

Warning

• 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 optional aluminium carrying case after
use, you must ensure that the instrument has cooled 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.

• Do not touch the well or insertion tube when these are deep frozen – they might

create frostbite.

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