Baker Hughes Druck Dry TC 165 User manual

Druck.com
Dry TC 165
Dry TC 650
Liquid TC 165
Liquid TC 255
Temperature Calibrators
Instruction Manual

Copyright 2013 Baker Hughes Company.
English–Dry TC / Liquid TC Temperature Calibrators | i
Introduction
This technical manual provides operating instructions for the Druck Dry TC and Liquid TC
temperature calibrators.
Scope
This technical manual contains a brief description, operation and testing procedures for the user
of this equipment.
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual:
• Do not use this equipment for any other purpose than that stated. Incorrect use can prevent
the protection given by the equipment from working.
• Use suitably qualified* Technicians and good engineering practice for all procedures in this
publication.
Maintenance
The equipment must be maintained using the manufacturer’s procedures and should be carried
out by authorized service agents or the manufacturer’s service departments.
Technical Advice
For technical advice contact Druck or subsidiary manufacturer of this product.
* A qualified technician must have the necessary technical knowledge, documentation, special test equipment
and tools to carry out the required work on this equipment.

Copyright 2013 Baker Hughes Company.
ii | Dry TC / Liquid TC Temperature Calibrators–English
Marks and Symbols on the Equipment
Symbol Description
This equipment meets the requirements of all relevant European safety directives. The
equipment carries the CE mark.
This equipment meets the requirements of all relevant UK Statutory Instruments. The
equipment carries the UKCA mark.
This symbol, on the equipment, indicates that the user should read the user manual.
This symbol, on the equipment, indicates a warning and that the user should refer to the user
manual.
Ce symbole, sur l'appareil, est un avertissement qui indique que l'utilisateur doit consulter
le manuel d'utilisation.
This symbol warns the user of the danger of electric shock.
Ce symbole alerte l’utilisateur sur le danger de choc électrique.
This symbol warns the user of the danger of hot surfaces.
Ce symbole alerte l’utilisateur du danger des surfaces chaudes.
Druck is an active participant in Europe’s Waste Electrical and Electronic Equipment
(WEEE) take-back initiative (directive 2012/19/EU).
The equipment that you bought has required the extraction and use of natural resources for
its production. It may contain hazardous substances that could impact health and the
environment.
In order to avoid the dissemination of those substances in our environment and to diminish
the pressure on the natural resources, we encourage you to use the appropriate take-back
systems. Those systems will reuse or recycle most of the materials of your end life
equipment in a sound way. The crossed-out wheeled bin symbol invites you to use those
systems.
If you need more information on the collection, reuse, and recycling systems, please contact
your local or regional waste administration.
Please visit the link below for take-back instructions and more information about this
initiative.
https://qrco.de/dsweee

Copyright 2013 Baker Hughes Company.
English–Dry TC / Liquid TC Temperature Calibrators | iii
Abbreviations
The following abbreviations are used in this manual; the abbreviations are the same in the
singular and plural.
Abbreviation Description
A Ampere
ac Alternating Current
cm Centimetre
cSt Centistokes
dc Direct Current
DUT Device Under Test
e.g. For example
etc. And so on
FS Full Scale
h Hour
i.e. That is
lbs Pounds
LED Light Emitting Diode
m Minute
max Maximum
min Minimum or minute
mm Millimetre
n/a Not Applicable
PC Personal Computer
PID Proportional Integral Differential
PV Primary Variable
SP Set Point
Ref Reference
RH Relative Humidity
SP Set Point
TRRoom Temperature
V Volts
VA Volt Ampere
°C Degrees Celsius
°C/min Degrees Celsius per minute
°F Degrees Fahrenheit

Copyright 2013 Baker Hughes Company.
iv | Dry TC / Liquid TC Temperature Calibrators–English

Copyright 2013 Baker Hughes Company.
English–Dry TC / Liquid TC Temperature Calibrators | v
Contents
1. Description 1
1.1 Models 1
1.2 Unpacking 1
1.3 Intended Purpose 2
1.4 Warranty 2
1.5 Exclusion of Liability 2
2. Safety Instructions 2
2.1 Qualified Personnel 3
2.2 General Safety Instructions 3
2.3 Special Safety Instructions 3
2.4 Calibration Liquid Safety Instructions 4
2.4.1 Water 4
2.4.2 Silicone Oil 4
2.4.3 Mineral Oil 4
3. Construction and Function 5
3.1 Construction 5
3.2 Function 6
3.2.1 Operation Procedure 6
4. Commissioning and Operation 6
4.1 Operating Conditions 7
4.2 Electrical Connection 7
4.2.1 Electrical Connection Procedure 8
4.3 Calibrator Preparation 8
4.3.1 Adaptor Sleeve Insert 8
4.3.2 Air Shield Insert 9
4.3.3 Infrared Insert 10
4.3.4 Surface Insert 11
4.3.5 Micro Bath 11
4.4 Switching On, Cool Down and Switching Off 17
4.4.1 Switching On 18
4.4.2 Cooling Down the Calibrator 19
4.4.3 Switching Off 19
4.5 Operating Modes 19
5. Operation 20
5.1 Controller Overview 20
5.2 Calibration Mode 21
5.2.1 Reference and Set Point Temperature Display 21
5.2.2 Display of Heating Control 21
5.2.3 Display of Fan / Cooling Control 22
5.2.4 Display of Heating / Cooling Capacity and Operating Duration 22
5.2.5 Configuration Menu 23
5.3 Temporary Set Point Mode 23
5.4 Main Menu 23

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vi | Dry TC / Liquid TC Temperature Calibrators–English
5.4.1 Automatic Control 24
5.4.2 Manual Control 26
5.4.3 Set Point Memory 28
5.4.4 Gradient Control / Temperature Profile 30
6. Testing Process / Calibration 36
6.1 Testing Temperature Sensors 36
6.2 Testing Procedure 36
6.2.1 Before Starting 36
6.2.2 Performing the Testing 36
6.2.3 Canceling the Testing 37
6.2.4 After the Testing 37
7. Troubleshooting 37
8. Maintenance, Cleaning and Transportation 38
8.1 Maintenance 38
8.1.1 Before Use 38
8.1.2 Annually 38
8.1.3 Recalibration 38
8.1.4 Calibration Liquid 38
8.1.5 Magnetic Stirrer 38
8.1.6 Mains Fuses 38
8.2 Recalibration 39
8.3 Cleaning 39
8.3.1 Exterior Chassis 39
8.3.2 Vent Grilles for Inlet Air 39
8.3.3 Inserts 39
8.3.4 Micro Bath 39
8.4 Return Goods/Material Procedure 40
8.4.1 Safety Precautions 40
9. Decommissioning and Disposal 40
9.1 Before Decommissioning 40
9.2 Decommissioning 40
9.3 Disposal of Calibration Liquid 41
9.4 Disposal of Calibrator 41
10. Specification 41
10.1 Shared Specification 41
10.2 Dry TC Specification 42
10.3 Liquid TC Specification 43
10.4 Heating and Cooling Times 44
10.4.1 Dry TC 165 44
10.4.2 Dry TC 650 45
10.4.3 Liquid TC 165 45
10.4.4 Liquid TC 255 46

Copyright 2013 Baker Hughes Company.
English–Dry TC / Liquid TC Temperature Calibrators | 1
1. Description
The Dry TC / Liquid TC calibrators are used to test and calibrate temperature measuring
instruments and temperature sensors, as well as for measuring temperatures. Typical
applications include the test and calibration of thermometers, temperature switches/thermostats,
resistance thermometers and thermocouples.
The portable instruments are of compact and robust construction so can be used on-site or in a
laboratory.
The Dry TC / Liquid TC series may be used for service purposes, or industrial and laboratory
applications.
1.1 Models
1.2 Unpacking
1. Carefully unpack the unit to prevent any damage.
2. Check the completeness of the delivery based on the delivery note.
Model Temperature Range Function
Dry TC 165 -35°C to 165°C
(-31°F to 329°F) Dry Block
Dry TC 650 TR to 650°C
(TR to 1202°F) Dry Block
Liquid TC 165 -35°C to 165°C
(-31°F to 329°F) Micro Bath
Liquid TC 255 TR to 255°C
(TR to 491°F) Micro Bath
INFORMATION The temperature calibrators are delivered in special
protective packaging. Save the packaging for returning the instrument safely to
the manufacturer for calibration or repair.
Table 1: Delivery Checklist
Item Dry TC 165
Dry TC 650
Liquid TC 165
Liquid TC 255
Druck Temperature Calibrator  
Mains cable.  
Test certificate.  
Dry TC 165 Dry TC 650 Liquid TC 165 Liquid TC 255
Dr
y
TC
1
65
Dry TC 650
L
i
qu
id TC 165
Li id TC 2

Copyright 2013 Baker Hughes Company.
2 | Dry TC / Liquid TC Temperature Calibrators–English
1.3 Intended Purpose
The Dry TC and Liquid TC series of calibrators may only be used for the testing and calibration
of suitable temperature measuring instruments, temperature sensors and for measuring
temperatures.
The calibrators may not be used for warming up or heating materials or gases. The calibrators
have been designed for indoor use only.
The micro baths may only be used with a suitable calibration liquid. Permitted liquids are silicone
oils, mineral oils and water. See Section 2.4.
Hazardous media (flammable or explosive liquids or gases) may not be used.
The operational safety of the calibrator is only guaranteed by intended use. The specified limits
may under no circumstances be exceeded. See Section 10.
It is your responsibility to select the instrument which is suitable for your specific application, to
connect it correctly, to carry out the tests safely and to maintain all components.
1.4 Warranty
The calibrator is under guarantee for 12 months from the date of delivery for construction errors
or material defects. The guarantee is limited to repair or replacing the calibrator.
Druck also provides an extra 5-year guarantee for calibrators which are calibrated and inspected
annually by the Druck's affiliated DAkkS laboratory in Germany.
Opening the calibrator, unauthorized repairs or incorrect use or installation of the calibrator
automatically result in the warranty being rendered null and void.
1.5 Exclusion of Liability
We accept no liability for any damage or malfunctions resulting from incorrect installation,
inappropriate use of the calibrator or failure to follow the instructions in this operating manual.
2. Safety Instructions
Before you use the calibrator, read through this operating manual carefully. If the instructions are
not followed, in particular the safety guidelines, this could result in danger for people, the
environment, and the calibrator and the system it is connected to.
The calibrator represents state-of-the-art technology. This encompasses accuracy, operating
function and the safe operation of the calibrator.
Directions on how to download the instruction manual.  
Protective packaging and transportation protection.  
Insert exchange tool. 
Transport cover. 
Work cover with five silicone plugs. 
Sensor cage. 
Magnetic stirrer. 
Magnetic lifter. 
Drain syringe. 
Table 1: Delivery Checklist
Item Dry TC 165
Dry TC 650
Liquid TC 165
Liquid TC 255

Copyright 2013 Baker Hughes Company.
English–Dry TC / Liquid TC Temperature Calibrators | 3
In order to guarantee that the calibrator operates safely, the operator must act competently and
be conscious of safety issues.
Druck provides support for the use of its products either personally or via relevant literature. The
customer verifies that our product is fit for purpose based on our technical information. The
customer performs customer-specific and application-specific tests to ensure that the product is
suitable for the intended use. With this verification, all hazards and risks are transferred to our
customers; our warranty is not valid.
2.1 Qualified Personnel
• The personnel in charge of the installation, operation and maintenance of the calibrator must
hold a relevant qualification. This can be based on training or relevant instructions.
• Personnel must be aware of this operating manual and have access to it at all times.
2.2 General Safety Instructions
• In all work, the existing national regulations for accident prevention and safety in the
workplace must be complied with. Any internal regulations of the operator must also be
complied with, even if these are not mentioned in this manual.
• Ensure that the complete operating instructions are always available at the calibrator
installation site.
• Degree of protection according to EN 60529. Ensure that the ambient conditions at the site
of use does not exceed the requirements for the stated protection rating, see Section 10.1.
• Structural safety in accordance with EN 61010-1. The calibrator must be installed in such a
way that the requirements for structural safety are met.
• Only use the calibrator if it is in perfect condition. Damaged or faulty calibrators must be
checked without delay and, if necessary, replaced.
• If problems cannot be remedied, immediately shut down the calibrator and ensure that it
cannot be started up accidentally.
• Never leave the calibrator unattended when it is in operation or in the cooling phase.
• Do not remove or destroy type plates or other markings on the calibrator, or the warranty is
rendered null and void.
2.3 Special Safety Instructions
• Thermal protection fuse.
a. The calibrator is equipped with a thermal protection fuse that works independently. If
there is an over-temperature inside the housing, the power supply to the heating
system is cut off. The thermal protection fuse is non-resettable. The calibrator cannot
be used anymore.
b. After the calibrator has cooled, return the calibrator to Druck.
• Risk of injury from hazardous gases.
a. When liquids are heated, evaporation can result in dangerous gases being released.
• The calibrator may not be used in a potentially explosive atmosphere.
INFORMATION The transport cover has a pressure relief safety valve. The
valve opens when the micro bath pressures exceeds ~1.5 bar. This can result in
hot vapor being released.
Remove the transport cover before using the micro bath.
Wait until the micro bath has cooled down before screwing on the transport
cover.

Copyright 2013 Baker Hughes Company.
4 | Dry TC / Liquid TC Temperature Calibrators–English
a. Remove all the easily flammable media from the vicinity of the calibrator.
b. Ensure that the calibrator cannot come in contact with easily flammable or explosive
media.
• Operate the calibrator only in the temperature range permissible for the DUT.
• Ensure that the DUT is held securely in the calibrator.
a. Use only suitable inserts.
b. When doing so, also ensure that the structural safety of the calibrator is retained.
2.4 Calibration Liquid Safety Instructions
Before using calibration liquids, read the entire safety data sheet thoroughly. Pay particular
attention to the information on the physical and chemical properties.
Only use calibration liquids that are suitable for the required temperature range and which are not
flammable.
Always wear safety goggles when handling calibration liquids. Druck recommends the following
calibration liquids:
2.4.1 Water
• Only use distilled water, otherwise excessive limescale and soiling will build up in the
calibrator micro bath tank.
2.4.2 Silicone Oil
• Use only the silicone oil recommended in Table 2.
• Always read the safety data sheet supplied with the silicone oil before using it.
• Always ensure adequate ventilation when working with silicone oil, since hazardous
substances can be released.
• Prevent silicone oil from coming into contact with your eyes.
• Since silicone oil is hygroscopic, always use the transport cover to close the calibration bath
after use.
2.4.3 Mineral Oil
• Druck supplies silicone oil with the calibrators.
• Using mineral oil is possible, but must be done at your own risk. The danger and the risk
must be borne by the user and our warranty will be rendered null and void.
Table 2: Calibration Liquids
Calibration Liquid Calibration Range Flashpoint
Distilled Water 2 °C to 95 °C
(35.6 °F to 203 °F) none
XIAMETER™ PMX-200 Silicone Fluid 5 cSt -40 °C to 123 °C
(-40 °F to 253.4 °F)
133 °C
(271.4 °F)
XIAMETER™ PMX-200 Silicone Fluid 10 cSt -35 °C to 155 °C
(-31 °F to 311 °F)
165 °C
(149 °F)
XIAMETER™ PMX-200 Silicone Fluid 20 cSt 7 °C to 220 °C
(44.6 °F to 428 °F)
230 °C
(446 °F)
XIAMETER™ PMX-200 Silicone Fluid 50 cSt 50 °C to 270 °C
(122 °F to 518 °F)
280 °C
(536 °F)

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English–Dry TC / Liquid TC Temperature Calibrators | 5
• Please follow the safety data sheet of the mineral oil used.
• The safety instructions for silicone oil apply equally to mineral oils as well. The same also
applies to the corresponding sections for silicone oil in this operating manual.
3. Construction and Function
3.1 Construction
Figure 1: General View
The calibrator consists of a robust steel housing (2) with integral carrying handle (1). The display
(3) is located on the front panel of the unit. Liquid TC calibrators have a thumb wheel (10) to
control the speed of the magnetic stirrer.
The mains inlet, switch and fuses (5) are located on the front of the unit. The service and data
interface (4) is located underneath the display (3).
During operation, cooling air is drawn in from the base of the unit (11, 12) and expelled through
grilles (7, 9). Dry TC calibrators expel air through the top of the unit (7). Liquid TC calibrators
expel air through side grilles (9).
The rear section of the housing contains the insulated dry block or micro bath. Heating elements,
together with an integrated temperature sensor, are used to regulate the temperature of the dry
block / micro bath. Some models contain cooling elements. These allow the temperature to be
regulated below room temperature.
1 Carrying handle. 2 Steel housing.
3 Controller display and keypad. 4 Service and data interface.
5 Mains inlet, switch with fuses. 6 Dry block.
7 Exhaust cooling air through upper housing grilles. 8 Micro bath with transportation cover.
9 Exhaust cooling air through side housing grilles. 10 Magnetic stirrer speed control. (Liquid TC only)
11 Inlet air for housing cooling. 12 Inlet air for dry block / micro bath cooling.
9
10
1
2
3
5
6
7
4
8
11
11
12

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6 | Dry TC / Liquid TC Temperature Calibrators–English
3.2 Function
The function of the calibrator is determined by the calibrator model and the installed insert.
Figure 2 shows an overview of the available inserts. Table 3 shows the compatibility of insert,
calibrator model and function.
Figure 2: Insert Overview
3.2.1 Operation Procedure
1. Install a suitable insert into the calibrator, see Section 4.3. Ensure that the insert has a
secure fit to ensure optimum heat transfer to the DUT.
2. Once all preparations have been completed, switch on the calibrator. See Section 4.4.1.
3. The calibrator heats or cools the dry block, or calibration liquid, to the set point temperature.
As soon as the temperature is stable, the DUT can be calibrated.
4. Repeat step 3 for all of the required calibration set points.
4. Commissioning and Operation
For safe operation of the calibrators, a formal commissioning procedure is necessary.
Commissioning includes the installation, electrical connections, preparation for the calibration as
well as correct switching on and off of the calibrator.
Table 3: Insert Compatibility
Ref Insert Function Dry TC 165
Dry TC 650
Liquid TC 165
Liquid TC 255
1 Adaptor Sleeve Dry Block  
2 Air Shield Dry Block 
3 Infrared Infrared 
4 Surface Surface 
5 Tub Micro Bath 
6Micro Bath (Direct Filling)a
a. Direct filling of the micro bath with calibration liquid, Liquid TC models only.
Micro Bath 
WARNING The calibrator may become very hot during operation. If the
calibrator is operated without supervision, third-party persons in the vicinity
could get injured. Moreover, flammable material could come into contact with
the calibrator and cause significant harm to personnel and/or damage to
property.
Never leave the calibrator unattended when it is in operation or in the cooling
down phase.
12 3 4 5
6

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Further, a visual inspection for damage is required before use.
The required steps are described in the following sections.
4.1 Operating Conditions
Select a safe installation site for commissioning the calibrator.
Considerations for selecting a safe installation site and calibrator operating position:
• Only suitable for indoor use, do not use outdoors.
• Operate only in the vertical position on an even surface. The surface must be stable, clean,
and dry.
• If the operational conditions do not conform to the above, the structural safety and the
specified properties of the calibrator cannot be guaranteed.
• At high testing temperatures, it is recommended to use a sufficiently large, fire-resistant,
supporting surface.
• Ensure sufficient clearance around the calibrator. On the front side > 1m, behind and to the
sides > 0.5 m. Ensure that there is sufficient head clearance and sufficient clear space
above the calibrator.
• Ensure sufficient ventilation.
• Do not operate in the vicinity of flammable materials.
• Do not install in a cupboard or other similar confining location.
• The ventilation openings must not be blocked or covered.
• The calibrator must be installed so that it can be switched off at any time.
4.2 Electrical Connection
Check the following points before you connect the calibrator:
1. Check the specified operating mains supply voltage range for the calibrator. See Section 10.
2. Ensure that the mains voltage range is the same as that specified on the rating plate.
3. Only connect the calibrator to a properly installed and earthed 3-pole socket for mains plugs
with earthing contact.
4. Only use extension cables or adaptor plugs with a protective earth connection.
INFORMATION The plug of the mains connecting cable serves as a
emergency stop device. Ensure that the plug is always easily accessible and
easy to reach. In an emergency, pull the plug so that the calibrator is isolated
from the mains.
RISK OF ELECTRIC SHOCK Calibrators that have been exposed to high
humidity for long periods have an initial higher than normal earth leakage
current. Ensure that the calibrator is always connected to a protective earth.
Always use a known good mains cable with an appropriate power plug.
Use only a Druck specified mains cable.
Ensure that the mains outlet is adequately rated and has a protective earth
connection.
Before turning on the power, make sure that the calibrator is properly connected
to the protective earth. The protective earth is connected to the calibrator
through the mains plug.

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8 | Dry TC / Liquid TC Temperature Calibrators–English
4.2.1 Electrical Connection Procedure
1. Insert the mains cable into the mains inlet socket of the calibrator.
2. Insert the plug of the mains cable in a suitable mains outlet with earthing contact.
4.3 Calibrator Preparation
The preparations for the micro bath must be carried out with the calibrator switched off and cooled
to room temperature.
The function of the calibrator is determined by the installed insert. The required insert is installed
into the opening of the dry block or micro bath. By using inserts, it is easy to switch between dry
block, infrared, surface and micro bath functions.
For an overview of insert compatibility, see Section 3.2 on page 6.
4.3.1 Adaptor Sleeve Insert
Adaptor sleeves with single or multiple holes are used for the calibration of straight temperature
sensors. For adaptor sleeve insert compatibility, see Section 3.2 on page 6.
Figure 3: Adaptor Sleeve Inserts
To achieve the specified accuracy of the calibrator, the DUT and the adaptor sleeve must be
matched to one another:
1. The borehole of the adaptor sleeve must be no greater than 0.5 mm of the DUT diameter.
2. The measurement element of the DUT must be located in the homogeneous temperature
zone of the adaptor sleeve. See Figure 3, dimension h.
HOT SURFACE The calibrator may become very hot when in operation.
Touching hot parts can result in serious injuries.
Never touch the dry block, micro bath, inserts or the DUT at temperatures above
35 °C (95 °F) or below 10 °C (50 °F).
Allow the calibrator to cool before you remove the DUT, change the insert or
switch off the calibrator.
INFORMATION Empty and clean the micro bath tank after usage (Liquid TC
models only). Otherwise inserts may become stuck in the calibrator.
1 Brass adaptor sleeves. (Dry TC models only)
2 Aluminum adaptor sleeves. (Liquid TC models only)
3 Insert exchange tool.
d Borehole diameter.
h Homogeneous zone. 40 mm (1.6″)
d
h
3
2
1

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4.3.1.1 Installation
The adaptor sleeve is inserted into the dry block using the insert exchange tool, see Figure 3
item 3.
4.3.1.2 Removal and Cleaning
1. Allow the calibrator cool before the adaptor sleeve is removed.
2. Pull the adaptor sleeve out of the dry block with the help of the insert exchange tool, see
Figure 3 item 3.
3. Clean the adaptor sleeve and the dry block to prevent inserts from getting stuck in the dry
block.
4.3.2 Air Shield Insert
The air shield insert provides optimum radial and axial temperature distribution. The borehole
divider provides a flexible and cost-effective adaptation to various calibration tasks. For air shield
insert compatibility, see Section 3.2 on page 6.
Figure 4: Air Shield Insert
4.3.2.1 Installation
The air shield is inserted into the dry block using the insert exchange tool, see Figure 4 item 2.
4.3.2.2 Removal and Cleaning
1. Allow the calibrator cool before the air shield is removed.
2. Pull the air shield out of the dry block with the help of the insert exchange tool, see Figure 4
item 2.
3. Clean the air shield and the dry block to prevent inserts from getting stuck in the dry block.
INFORMATION Use only Druck adaptor sleeves.
If in doubt, contact Druck.
1 Air shield insert.
2 Insert exchange tool.
2
1

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10 | Dry TC / Liquid TC Temperature Calibrators–English
4.3.3 Infrared Insert
The infrared insert is used for contact-less measurement infrared thermometers. The infrared
insert has a specially designed surface and surface coating on the inside. As a result, an
emissivity of 0.9994 (black body) is achieved.
Figure 5: Infrared Insert
The additional holes in the border, see Figure 5 item 2, are for external reference sensors. This
allows the exact temperature of the inside face of the infrared insert to be determined.
4.3.3.1 Installation
1. The infrared insert is inserted into the dry block using the insert exchange tool, see Figure 5
item 3.
2. Centre the infrared insert so that there is an even air gap between the infrared insert and the
dry block.
4.3.3.2 Removal and Cleaning
1. Allow the calibrator cool before the infrared insert is removed.
2. Pull the infrared insert out of the dry block with the help of the insert exchange tool, see
Figure 5 item 3.
3. Clean the infrared insert and the dry block to prevent inserts from getting stuck in the dry
block.
4.3.3.3 Application Tips
1. The measuring spot of the infrared thermometer must project itself onto the floor of the
infrared insert during the calibration. The measuring spot must be smaller than the inner
diameter and must not touch the wall of the infrared insert.
2. Ice or condensation can form in the infrared insert at temperatures of less than 0 °C (32 °F)
in high humidity levels. This can affect the emissivity of the infrared insert and degrade the
calibration accuracy. Ice or condensation formation can be reduced by:
a. Covering the measuring opening of the infrared insert.
b. Keeping the measuring opening closed for as long as possible.
c. Only opening the measuring opening briefly for the calibration.
Note: Ice or condensation can be removed by gently heating the infrared insert.
1 Infrared insert.
2 External sensor bore holes:
2 × 3.5 mm (0.138″)
1 × 4.5 mm (0.177″)
3 Insert exchange tool.
3
1
2

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4.3.4 Surface Insert
The surface insert is used for calibrating surface temperature sensors. The surface insert is
hollow in construction. When installed, the top portion of the surface insert protrudes above the
dry block.
Figure 6: Surface Insert
The additional holes in the border, see Figure 6 item 2, are for external reference sensors. This
allows the exact temperature of the surface insert to be measured.
The two threaded boreholes in the border are for the accompanying exchange tool.
4.3.4.1 Installation
1. The surface insert is inserted into the dry block using the exchange tool, see Figure 6 item 3.
2. Centre the surface insert so that there is an even air gap between the surface insert and the
dry block.
4.3.4.2 Removal and Cleaning
1. Allow the calibrator cool before the surface insert is removed.
2. Pull the surface insert out of the dry block with the help of the exchange tool, see Figure 6
item 3.
3. Clean the surface insert and the dry block to prevent inserts from getting stuck in the dry
block.
4.3.4.3 Application Tips
When using an external reference sensor, insert the sensor into the borehole so that its
measuring element is situated under the middle of the calibration surface.
4.3.5 Micro Bath
The micro bath is used for calibrating sensors with special shapes or dimensions. Direct contact
between the sensor and the calibration liquid ensures excellent heat transfer.
1 Surface insert.
2 External sensor bore holes:
1 × 3.0 mm (0.118″)
1 × 3.1 mm (0.122″)
1 × 4.5 mm (0.177″)
3 Insert exchange tool.
WARNING Wear safety goggles. Calibration liquid may be ejected when
working with the micro bath. Always wear safety goggles when handling
calibration liquids.
3
2
1

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12 | Dry TC / Liquid TC Temperature Calibrators–English
The calibration liquid is poured directly into the micro bath tank / tub insert.
The micro bath includes the following accessories:
• Transport Cover
• Work Cover
• Sensor Cage
• Magnetic Stirrer
• Drain Syringe
• Magnetic Lifter
Note: A removable tub insert is available as an optional accessory.
The accessories are described in more detail in the following sections.
4.3.5.1 Transport Cover
The transport cover seals the micro bath, preventing spillage of the calibration liquid during
transportation.
Figure 7: Transport Cover
4.3.5.2 Work Cover
Figure 8: Work Cover
The work cover is used to:
a. Reduce evaporation of the calibration liquid.
b. Reduce the cooling of the surface of the calibration liquid.
c. Provide stable positioning of the DUT in the micro bath.
WARNING Remove the transport cover before using the micro bath.
The transport cover has a pressure relief safety valve. The valve opens when the
micro bath pressures exceeds ~1.5 bar. This can result in hot vapor being
released.