Ametek JOFRA RTC-156 A User manual

Reference manual
Reference Temperature Calibrator
Jofra RTC-156/157/158/159/168/187/250/700
A/B/C

Reference Manual
Reference Temperature Calibrator
JOFRA RTC-156/157/158/159/168/187/250/700 A/B/C
Copyright 2012 AMETEK Denmark A/S

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About this manual….
•The structure of the manual
This manual is divided into 11 sections. These 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 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 that 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
injury
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.
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List of contents
1.0 Introduction...................................................................................................................................5
1.1 Warranty .....................................................................................................................................................7
1.2 Receiving the Reference Temperature Calibrator......................................................................................7
1.3 Dimensioning drawings...............................................................................................................................9
2.0 Safety instructions......................................................................................................................10
3.0 Setting up the calibrator for use ................................................................................................15
3.1 Preparing the dry-block calibrator.............................................................................................................15
3.1.1 When setting up the dry-block calibrator, you must….................................................................16
3.2 Choosing an insertion tube.......................................................................................................................17
3.2.1 Standard insertion tubes..............................................................................................................17
3.3 Inserting the sensors.................................................................................................................................19
3.4 Preparing the liquid bath calibrator (RTC-158/168/250 A/B/C only) .........................................................22
3.4.1 When setting up the liquid bath calibrator, you must… ...............................................................23
3.4.2 Selection of fluids.........................................................................................................................27
3.4.3 Handling of lids ............................................................................................................................28
3.4.4 Inserting the sensors....................................................................................................................28
3.4.4 Liquid container............................................................................................................................29
3.5 External reference sensor.........................................................................................................................29
4.0 Calibrator Interface .....................................................................................................................30
4.1 Keypad-Functions.....................................................................................................................................30
4.2 Display - Functions ...................................................................................................................................31
4.2.2 Main screen display information ..................................................................................................32
4.2.3 Main screen temperature values..................................................................................................33
4.2.4 Stability of temperature values.....................................................................................................33
4.3 Input/Output Connections.........................................................................................................................34
4.4 Input sections (B and C versions only).....................................................................................................35
5.0 Operating the calibrator..............................................................................................................36
5.1 Operating principle....................................................................................................................................36
5.1.1 Horizontal Menu...........................................................................................................................36
5.1.2 Vertical Menu...............................................................................................................................36
5.1.3 Parameter Fields..........................................................................................................................37
5.1.4 Working with lists .........................................................................................................................38
5.2 Starting the calibrator................................................................................................................................40
5.3 Setting the temperature ............................................................................................................................41
5.4 Calibration.................................................................................................................................................41
5.4.1 Running a calibration ...................................................................................................................42
5.4.2 Viewing calibration results ...........................................................................................................44
5.4.3 Displaying calibration information................................................................................................45
5.4.4 Deleting workorders.....................................................................................................................46
5.5 Switch test menu ......................................................................................................................................48
5.5.1 Running a switch test...................................................................................................................48
5.5.2 Showing switch test results..........................................................................................................50
5.6 Auto step menu.........................................................................................................................................53
5.6.1 Running an Auto step calibration.................................................................................................53
5.6.2 Auto Step test results...................................................................................................................55
5.7 Sensor Setup menu..................................................................................................................................56
5.7.1 Setting the additional stability time (A version)............................................................................56
5.7.2 Setting the parameters for TRUE – reference sensor (B and C versions only)...........................57
5.7.3 Setting the parameters for DLC– dynamic load compensation (B and C versions only) ............58
5.7.4 Setting the parameters for SUT– Sensor under test (B versions only) .......................................58
5.7.5 Viewing the Reference and DLC data (B and C versions only)...................................................60
5.8 Calibrator Setup menu..............................................................................................................................61
5.8.1 Setting the temperature parameters............................................................................................61
5.8.2 Setting the temperature resolution...............................................................................................62
5.8.3 Setting the sound, volume and operating mode..........................................................................63
5.8.4 Setting recalibration interval.........................................................................................................63
5.8.5 Changing language......................................................................................................................63
5.8.6 Changing the date and time.........................................................................................................64

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5.8.7 Saving a setup .............................................................................................................................64
5.8.8 Loading a setup ...........................................................................................................................65
5.8.9 Resetting the instrument setup to factory defaults.......................................................................65
5.8.10 Network Configuration (for service use only)...............................................................................65
5.9 Selecting the stirrer speed (RTC-158/168/250 A/B/C only)......................................................................67
5.10 Information Screen ...................................................................................................................................68
5.11 About the calibrator...................................................................................................................................68
5.12 Simulation or training................................................................................................................................69
6.0 After use.......................................................................................................................................70
6.1 Storing and transporting the calibrator .....................................................................................................70
6.1.1 Transporting the dry-block calibrator ...........................................................................................72
6.1.2 Transporting the liquid bath calibrator .........................................................................................72
6.2 Emptying the well (liquid baths only) ........................................................................................................72
7.0 Error messages (List of alarms).................................................................................................74
8.0 Returning the calibrator for service...........................................................................................77
9.0 Maintenance ................................................................................................................................79
9.1 Replacing the main fuses .........................................................................................................................79
9.2 Cleaning....................................................................................................................................................80
9.3 Adjusting and calibrating the instrument...................................................................................................81
9.4 Maintenance of STS-reference sensor.....................................................................................................82
9.5 Maintenance of DLC-sensor.....................................................................................................................83
9.6 Testing the overtemperature function.......................................................................................................83
10.0 Technical specifications.............................................................................................................84
11.0 List of accessories....................................................................................................................129

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1.0 Introduction
Congratulations on your new AMETEK JOFRA RTC Calibrator!
With this AMETEK JOFRA calibrator, you have chosen an extremely effective instrument, which
we hope will live up to all your expectations.
This RTC calibrator is a fast, timesaving, and reliable true industrial temperature calibrator
designed for on-site use.
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 are 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 RTC-156 A - Temperature calibrator
•JOFRA RTC-156 B - Temperature calibrator with sensor and reference inputs
•JOFRA RTC-156 C - Temperature calibrator with reference input
•JOFRA RTC-157 A – Temperature calibrator
•JOFRA RTC-157 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-157 C - Temperature calibrator with reference input
•JOFRA RTC-158 A – Temperature calibrator
•JOFRA RTC-158 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-158 C - Temperature calibrator with reference input
•JOFRA RTC-159 A – Temperature calibrator
•JOFRA RTC-159 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-159 C - Temperature calibrator with reference input
•JOFRA RTC-168 A – Temperature calibrator
•JOFRA RTC-168 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-168 C - Temperature calibrator with reference input
•JOFRA RTC-187 A – Temperature calibrator
•JOFRA RTC-187 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-187 C - Temperature calibrator with reference input
•JOFRA RTC-250 A – Temperature calibrator
•JOFRA RTC-250 B – Temperature calibrator with sensor and reference inputs
•JOFRA RTC-250 C - Temperature calibrator with reference input
•JOFRA RTC-700 A - Temperature calibrator
•JOFRA RTC-700 B - Temperature calibrator with sensor and reference inputs
•JOFRA RTC-700 C - Temperature calibrator with reference input
Model A
Model
B
Model
C

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Patented temperature calibrator technology.
•Patented DLC system that insures high uniformity in the calibration zone. All models.
•Patented fast cooling technology. RTC-700 only.
•Patented cooling technology giving the broadest temperature range for ultracooler calibrators.
RTC-159 only.
Beside patents the RTC series offers unique Jofra features and functions:
•Automatic Reference sensor protection
•Automatic Intelligent Recalibration Information - IRI
•Selectable Silent or fast mode operation
ISO-9001 certified
AMETEK Denmark A/S was ISO
-9001 certified in September 1994 by Bureau Veritas
Certification Denmark.
CE/UKCA-labels
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 and the RoHS Directive 2011/65/EU amended by
Directive 2015/863/EU.*
Your new temperature calibrator bears the UKCA label and conforms to The
Electromagnetic Compatibility Regulations 2016, The Electrical Equipment
(Safety) Regulations 2016, and The Restriction of the Use of Certain Hazardous
Substances in Electrical and Electronic Equipment Regulations 2012 (RoHS).
Technical assistance
Please contact the dealer from whom you acquired the instrument if you require technical
assistance.
* RTC-156 A / RTC-156 B / RTC-156 C from serial no. xxxxxx-01236, RTC-157 A / RTC-157 B / RTC-157 C from serial no. xxxxxx-01231, RTC-158 A / RTC-158 B /
RTC-158 C from serial no. xxxxxx-01348, RTC-159 A / RTC-159 B / RTC-159 C from serial no. xxxxxx-00689, RTC-168 A / RTC-168 B / RTC-168 C from serial no.
xxxxxx-00001, RTC-187 A / RTC-187 B / RTC-187 C from serial no. xxxxxx-00072, RTC-250 A / RTC-250 B / RTC-250 C from serial no. xxxxxx-00262 and RTC-700 A
/ RTC-700 B / RTC-700 C from serial no. xxxxxx-00832.

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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.
1.2 Receiving the Reference 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 RTC Calibrator
•1 USB memory stick containing electronic manuals and software package:
JOFRACAL, AMETRIM and CON050
•2 sets of test leads and test clips (2 black and 2 red – B versions only)
•Thermal protection shield (RTC-700 only)
•1 tool for insertion tube
•1 USB cable
•1 Calibration certificate (International traceable, A-versions)
•2 Calibration certificates (International traceable, C-versions)
•3 Calibration certificates (International traceable, B-versions)
•1 set of rubber cones for insulation plugs (RTC-156/157/158/159/168/187/250
only)
•1 insulation collar (RTC-156 only)

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•RTC-158/168/250 A/B/C only (liquid bath) – OPTIONAL :
•1 liquid bath kit consisting of :
-1 sensor basket with temperature equalizer tube
-2 lids for transportation / calibration (RTC-158/250)
-1 lid for transportation (RTC-168)
-1 lid for calibration (RTC-168)
-3 stirring magnet
-1 stirring magnet remover (RTC-158/250)
-1 liquid drainage syringe
-1 bottom shield
-1 silicone oil
-1 oil material safety data sheet
When reordering, please specify the part numbers according to the list of accessories,
section 11.0.
Optional parts can also be found in the list of accessories
Caution
Do not use the RTC-158/168 insulation plug (black POM) with the RTC-250 instrument
due to the risk of melting.
Always use the correct - yellow/brown PEEK - insulation plug with the RTC-250
instrument.
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1.3 Dimensioning drawings
RTC
-
156/157/187 A/B/C
RTC
-
158/168/250 A/B/C
RTC
-
159 A/B/C
RTC
-
700 A/B/C

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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.
The screen menus shown in this manual represent the menus displayed when
using a B
-
version.
Disposal – WEEE Directive
These calibrators contain Electrical and Electronic circuits and must be recycled or
disposed of properly (in accordance with the WEEE Directive 2012/19/EU).
Warning
About the use:
•Always supply the calibrator using a power circuit which is separate from essential
safety equipment and vital hospital equipment etc., to prevent fatal consequential
damages from a potential electrical failure.
•The calibrator must 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.
•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.
•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 free 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 (RTC-250/700 only).
•If the calibrator is wet or has been in a wet environment, do not apply power until
the moisture has been removed for example by storage at 50°C in a low humidity
environment for at least 4 hours.

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•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 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 in the dry-block calibrator and cleaning oil in the liquid bath
calibrator.
•Use protection shield when calibrating at high temperatures (RTC-700)
•The RTC-159 contains R-1270 and R-704 under pressure. The calibrator must
under no circumstances be stored at ambient temperatures above 50°C (122°F)
or operated at ambient temperatures above 40°C (104°F). Doing so may cause a
hazard.
•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:
•For B and C versions only, the sockets on the input module must NEVER be
connected to voltages exceeding 30V with reference to ground.
•Thermostats connected to the switch test input must not be connected to any other
voltage source during a test.
About insertion tubes, insulation plugs, well and sensor:
•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 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.
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.
About the liquid bath ( RTC-158/168/250 A/B/C only ):
•Product information on the fluid must be carefully investigated before use.
•When using liquids in the calibrator, ensure proper ventilation or local extraction to
handle vapor and other airborne particles, as recommended for the particular liquid
in accordance with the MSDS (Material Safety Data Sheet) of the liquid and in
accordance with the local environmental regulations.
•When handling the liquid, ensure to immediately wipe up and handle spillages in
accordance with the MSDS (Material Safety Data Sheet) of the liquid and in
accordance with the local environmental regulations.
•For liquid bath ensure that the sensor is absolutely clean and dry as a few drops of
water in the well (liquid baths) might cause a steam explosion.
•Do not pour cold fluid into a hot well – it might cause an explosion.
•AMETEK Denmark A/S does not take any responsibility, if the well is filled with
other fluids than those recommended.

127139 19 2021-10-26 page 12
•Liquid baths should only be operated by trained personal.
•Heat transfer fluids must only be used in calibrators prepared as a liquid bath. If
these fluids are heated above specified temperature they will create noxious or
toxic fumes. Proper ventilation must be used.
•To avoid hazards from treating fluids in a wrong manner, always reduce the "Max.
SET-temperature allowed” in the CALIBRATOR SETUP MENU according to the
specifications of the fluid to be used.
If using a calibrator outside of the fluids specifications there is a risk of fire hazards,
personal Injury or chemical release.
By reducing the "Max. SET-temperature allowed”, the calibrator cannot be used
outside this temperature range.
Be aware of the flash point, the boilling point and other fluid properties applicable to
the usage when setting the Max. SET-temperature. Read the MSDS (Material
Safety Data Sheet) of the liquid before use. The Max. SET-temperature must never
exceed (liquid flash point – 50°C).
•Always remove the liquid from the calibrator before transportation.
•Do not handle hot fluid.
•If the oil is heated beyond the flash point, it may constitute a fire hazard.
•Do not pour water or any other fluids into a bath filled with hot oil, because only a
few drops of water might cause a steam explosion, if poured into above 100°C hot
oil.
•Do not under any circumstances pour water on burning oil. It might cause a
dangerous steam explosion.
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 lid or the spill tray as the calibrator is heating up – they may be
very hot and cause burns (RTC-158/168/250 A/B/C only).
•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.
Caution – Cold surface
Below 0°C/32°F (applies only to the RTC-156/157/158/159/168/187 A/B/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 on the well. This, in turn, may cause the material surfaces
to oxidize.

127139 19 2021-10-26 page 13
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 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.
•Always place power cable and cables to attached accessories, such as sensors, in
a safe way to reduce the risk of tripping.
•When transporting (carrying) the calibrator, be extra careful not to drop it on other
materials, equipment, and body parts.
•Ensure that the allowed temperature range of the external sensors is not exceeded
by the calibrator’s temperature range. See section 5.8.1 to setup the calibrator’s
allowed temperature range.
•Acoustic noise emitted from the calibrator may contribute to the existing noise
environment. Be aware of the total noise exposure and act accordingly to maintain
a safe, healthy, and pleasant working environment.
About the liquid bath ( RTC-158/168/250 A/B/C only ):
•Before use, ensure that all external equipment and accessories in contact with the
liquid is suited to this exposure.
•Be careful not to overfill the well with liquid.
•Avoid getting silicone oil on the clothes. It is impossible to wash off.
•The silicone oil level rises several centimetres when the temperature is rising.
Please read instructions in section 3.4.2 about oil level. To stop overflow switch off
the main power or set a low temperature and the oil level will decrease when
cooled down.
•In case of liquid spillages into holes, slots or crevices in the calibrator, attempt to
wipe up the liquid as soon as possible. If the liquid is electrically conductive or
corrosive, immediately power off the calibrator and contact the dealer to send in the
calibrator for service.
•Carefully wipe off all silicone oil from the sensor under test to avoid spreading of
the silicone oil.
•Be careful to select the right oil for the right task. Using other than the
recommended oils might cause damage to the calibrator or degrade the
performance.
•Remove excess hot fluid with the outmost care, as it might be very hot.
•Do not attempt to remove hot fluid with the liquid drainage tube, as it might melt.
About the well, insertion tube and sensor:
•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.
•Do not use any alkali, acid or ionic fluids in the aluminium well as it might be
damaged.

127139 19 2021-10-26 page 14
•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 – 250°C (482°F) / 700°C (1292°F) - for a
period of minimum 30 minutes (RTC-250/700 A/B/C 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.
•The tip of the sensor should rest at the bottom of the sensor basket for optimum
results (liquid baths only).
•Be careful not to submerge the handle or wire inlet of the sensor-under-test in the
fluid, as this might damage the sensor (liquid baths only).
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 unauthorized spare parts.
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3.0 Setting up the calibrator for use
3.1 Preparing the dry-block calibrator
Warning
•The calibrator must 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.
•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.
•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 free 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 (RTC-250/700 only).
•If the calibrator is wet or has been in a wet environment, do not apply power until
the moisture has been removed for example by storage at 50°C in a low humidity
environment for at least 4 hours.
•The RTC-159 contains R-1270 and R-704 under pressure. The calibrator must
under no circumstances be stored at ambient temperatures above 50°C (122°F)
or operated at ambient temperatures above 40°C (104°F). Doing so may cause a
hazard.
Note …
The instrument must not be exposed to draughts.
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3.1.1 When setting up the dry-block 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.
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). 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.
B.
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

127139 19 2021-10-26 page 17
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 calibration in the RTC-250/700 instruments, the
insertion tubes must be heated up to maximum temperature 250°C (482°F) / 700°C
(1292°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 part number.
Alternatively, you may order an undrilled insertion tube and drill the required hole yourself. The
finished dimensions should be as follows:
•Sensor diameter ØD+0.2mm +0.05/-0
•DLC hole : Ø3.1mm +0.05/-0 (RTC-156/157/158/159/168/187/250 A/B/C)
Ø4.2mm +0.05/-0 (RTC-700 A/B/C)
•Reference sensor holes : Ø4.2mm +0.05/-0 and Ø6.55mm +0.05/-0
Note …
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
.
For RTC-156/157/158/159/168/187 A/B/C only:
In order to get optimum results and prevent ice from building up in the well of the cooling
calibrators, a proper sized insulation plug must be placed over the well during the calibration
process.
The holes in the plug must have a tight fit and unused holes must be covered using e.g. silicone
plugs (spare part no. 126280).
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
.
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127139 19 2021-10-26 page 18
PARTS NO. FOR UNDRILLED INSERTION TUBES
Sensor
Size
RTC-156/157/187
A/B/C
(Aluminium
tubes)
RTC-159 A/B/C
(Aluminium
tubes)
RTC-158 A/B/C
(Aluminium
tubes)
RTC-168 A/B/C
(Aluminium
tubes)
RTC-250 A/B/C
(Aluminium
tubes)
RTC-700 A/B/C
(Alu. Bronze
tubes)
Undrilled 127299 128453 124899 130489 127758 127197
Undrilled with
DLC hole 127300 128454 127829 130488 127834 127198
Undrilled with
DLC and ref.
holes 127301 128455 127831 130486 127835 127199
PARTS NO. FOR STANDARD INSERTION TUBES – MULTI-HOLE - METRIC
Insert type
RTC-156/157/187 A/B/C
(Aluminium tubes) RTC-159 A/B/C (Aluminium tubes) RTC-700 A/B/C (Alu. Bronze tubes)
Type M01 127329 128456 127200
Type M02 127330 128457 127201
Type M03 127331 128458 127202
Type M04 127332 128459 127203
Type M07 127241 128462 127244
Type M08 127242 128463 127245
Type M09 127243 128464 127246
Set of 4 pcs. Inserts, 3mm to
13mm. 127326 128466 127252
PARTS NO. FOR STANDARD INSERTION TUBES – MULTI-HOLE - IMPERIAL
Insert type
RTC-156/157/187 A/B/C
(Aluminium tubes) RTC-/159 A/B/C (Aluminium tubes) RTC-700 A/B/C (Alu. Bronze tubes)
Type M05 127327 128460 127204
Type M06 127328 128461 127205
Type M10 127247 128465 127249
Set of 3 pcs. Inserts, 1/8” to
1/2”(7/16”)* 127311 128467* 127254
PARTS NO. FOR STANDARD INSERTION TUBES – MULTI-HOLE - METRIC
Insert type
RTC-158 A/B/C
(Aluminium tubes) RTC-168 A/B/C (Aluminium tubes) RTC-250 A/B/C (Aluminium tubes)
Type M01 124897 130490 127759
PARTS NO. FOR STANDARD INSERTION TUBES – MULTI-HOLE - IMPERIAL
Insert type
RTC-158 A/B/C
(Aluminium tubes) RTC-168 A/B/C (Aluminium tubes) RTC-250 A/B/C (Aluminium tubes)
Type M02 124898 130491 127760

127139 19 2021-10-26 page 19
PARTS NO. FOR STANDARD INSERTION TUBES WITH HOLES FOR 4 MM AND /1/4” REF. SENSORS AND DLC
SENSOR - IMPERIAL
Sensor
size
RTC-156/157/187 A/B/C
(Aluminium tubes) RTC-159 A/B/C (Aluminium tubes) RTC-700 A/B/C (Alu. Bronze tubes)
1/8” 127302 128468 127164
3/16” 127303 128469 127165
1/4” 127304 128470 127166
5/16” 127305 128471 127167
3/8” 127306 128472 127168
7/16” 127307 128473 127169
1/2” 127308 128474 127170
9/16” 127309 128475 127171
5/8” 127310 128476 127172
Set of 9 pcs. Imperial inserts 127335 128491 127173
PARTS NO. FOR STANDARD INSERTION TUBES WITH HOLES FOR 4 MM AND /1/4” REF. SENSORS AND DLC
SENSOR - METRIC
Sensor
size
RTC-156/157/187 A/B/C
(Aluminium tubes) RTC-159 A/B/C (Aluminium tubes) RTC-700 A/B/C (Alu. Bronze tubes)
3 mm 127312 128477 127148
4 mm 127313 128478 127149
5 mm 127314 128479 127150
6 mm 127315 128480 127151
7 mm 127316 128481 127152
8 mm 127317 128482 127153
9 mm 127318 128483 127154
10 mm 127319 128484 127155
11 mm 127320 128485 127156
12 mm 127321 128486 127157
13 mm 127322 128487 127158
14 mm 127323 128488 127159
15 mm 127324 128489 127160
16 mm 127325 128490 127161
Set of 14 pcs. Metric inserts 127336 128492 127162
NOTE:
All insertion tubes (metric and imperial) for RTC-156/157/158/159/168/187/250 are supplied with a matching
insulation plug.
The insulation plug for the RTC-158 can be used in
both the RTC
-
158 and the RTC
-
168 instruments
.
The insulation plug for the RTC-168 can ONLY
be used in the RTC-168 instrument.