WIKA CTD9300-165 Operating Manual
Operating Instructions
Betriebsanleitung
Temperature Dry Well Calibrator
Temperatur-Blockkalibrator
CTD9300
GB
D
Temperature Dry Well Calibrator CTD9300-165/650
Temperatur-Blockkalibrator CTD9300-165/650
GB
Temperature Dry Well Calibrator Page 1 - 66
D
Temperatur-Blockkalibrator Seite 69 - 133
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Temperature Dry Well Calibrators CTD9300
Contents
Contents
Contents
1. General Instructions 5
2. Device Description 9
3. Moduses and Functions 21
4. Operating the Calibrator 51
5. Technical Data 60
6. Appendix 64
GB
Information!
This symbol identifies information, instructions or useful hints.
Caution!
General point of hazard! Please heed the operating instructions.
Danger!
Hazard of personal injury through electric voltage.
Danger!
Hazard of personal injury through high temperatures.
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Temperature Dry Well Calibrators CTD9300
Preface
GB
Preface
Congratulations on buying a WIKA temperature dry well calibrator
of the CTD9300 family. For the time being, this family of
calibrators comprises two devices for the following temperature
ranges:
CTD9300-165 from -30 °C to 165 °C
CTD9300-650 from 40 °C to 650 °C
Since the operation of the devices is identical, we have decided to
combine the operating instructions for the two devices.
The operating instructions are intended for skilled workers and
semi-skilled workers. Thoroughly read the associated instructions
prior to every work step and adhere to the sequence specified.
Read the "General Instructions" section especially attentively.
Memorise the pictograms and their significance.
The device is designed for calibrating temperature switches,
thermocouples, resistance thermometers and mechanical
thermometers. Please use them in compliance with their intended
use.
If you encounter any problems or if you have any questions, please
revert to your supplier or directly to the manufacturer.
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
D-63911 Klingenberg
Germany
Phone no.: (+49) 93 72/132-0
Fax no.: (+49) 93 72/132-406
info@wika.de
www.wika.de
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1. General Instructions
1. General Instructions
1.1 Fundamental Safety Instructions
When performing any work on the device, always heed the national
safety instructions and accident prevention regulations as well as
the following safety instructions in the present operating
instructions.
Through the power cable, the device is supplied with a voltage
hazardous to people.
The faultless and safe operation of the device requires appropriate
transport, professional storage, setup, and use as intended as well
as cautious operation and servicing.
Applications other than those described in the present operating
instructions is regarded to be improper use and must thus be
excluded.
If faults cannot be eliminated, the device must be shut down
immediately and protected against inadvertent startup.
Danger!
Only the manufacturer is authorized to perform repairs.
Manipulation and modifications of the device are illegal.
Before replacing the safety fuse, the device must be disconnected
from the mains voltage by pulling the power plug out of the mains
socket.
For other important safety instructions, please refer to the
individual sections of these operating instructions.
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5WIKA Operating Instructions CTD9300 Rev. 1
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1. General Instructions
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1.2 Safety Instructions Relating to Operation of the Device
The temperature dry well calibrators of the CTD9300 series have
been developed and manufactured in compliance with the state of
the art. This applies to the accuracy of measurement, the mode of
operation and the safe operation of the devices. To guarantee safe
operation, however, the operator must behave in an expertly and
safety-conscious manner.
Relevant instructions are included in this section. Warnings relating
especially to individual functional sequences and tasks are also
included in the respective sections of the present operating
instructions. These warnings are identified by special symbols.
Caution:
Use the calibrator exclusively in compliance with the descriptions
included in the present operating instructions. Failure to observe
the safety instructions and operating instructions will impair the
protective measures provided.
Danger!
Before touching the dry well or the adapting sleeve, check the
current dry well temperature since a heated device bears the
imminent risk of burns.
Since there are high temperatures on the top of the calibrator
directly in front of the dry well bore, the following warning has been
attached to this area:
Fig. 1: Warning sign
Caution!
Directly to the right of the power switch the warning symbol is
displayed. It advises you to read the corresponding chapters
(e.g. chapter 2, chapter 3) of the operating instructions.
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1. General Instructions
Safety Instructions:
Remove all highly combustible media from the vicinity of the
device and ensure that it cannot come into contact with easily
inflammable or explosive substances.
Make sure that the integrated fans can always deliver sufficient
cooling air. Do not impair the air supply by placing the devices
on a soft, resilient surface.
Connect the devices to a power circuit with minimum risk of a
power failure, since it will no longer be possible to supply
cooling air in the case of a power failure
Make sure that the adapting sleeves and probes are not
contaminated with any substances (e.g. oil) that may cause
ignition or explosion during heating.
Never remove adapting sleeves from a heated dry well since
heated adapter inserts bear a fire hazard.
Never remove probes from a heated dry well since these bear the
imminent risk of burns.
Never leave a heated device unattended.
Always let a heated device cool to below 50 °C before
disconnecting it from the mains.
Never try to repair the device yourself, always revert to the
manufacturer.
Since the housing of the calibrator is made of metal, only power
cables with ground wire may be used. Operate the calibrator
exclusively with the power cable provided. The power cable
connector is on the bottom of the calibrator, i.e. when using a
different type of cable, the calibrator may topple over.
If the calibrator is not used for an extended period of time, humidity
may penetrate into the heating element due to the material used.
After transporting or storing the calibrator in a humid environment,
the heating elements must thus be heated slowly when starting the
calibrator. During the drying process, the calibrator will not have
attained the isolation voltage required for protection class I.
The noise ramps of all dry well calibrators of the CTD9300 series
are below 70 dbA.
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1. General Instructions
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1.3 Ground Wire Monitoring
For checking the basic isolation of the heater, the calibrator is
equipped with a ground wire monitor. The monitoring unit operates
independently of the other controller components and switches off
the power supply of the heater as soon as the calibrator loses the
connection to the ground wire system of the isolation. Once the
connection to the ground wire system has been re-established, the
monitoring unit automatically reconnects the heating circuit to the
power system.
1.4 Duty to Take Due Care of the Operator
For safe operation of the device, the operator must especially
ensure that:
the device is exclusively used as intended (refer to the section
"Intended Use" in chapter "Device Description") and that no
hazardous media are used and all the technical specifications
are adhered to.
the device is operated in faultless, fully functional condition
only.
the present operating instructions are always available in legible
condition and complete at the application site of the device.
only authorised and qualified personnel operates, maintains and
services the device.
the operator of the device is periodically instructed in all
applicable operational safety and environmental protection
issues and that he/she is familiar with the operating
instructions, especially with the safety instructions contained
therein.
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2. Device Description
2. Device Description
2.1 Intended Use
The calibrators of the CTD9300 series may be used exclusively for
the calibration and verification of thermocouples, resistance
thermometers, mechanical thermometers and temperature
switches.
The introduction of foreign substances such as oil or heat
conductive paste with the aim of enhancing the heat transfer to the
probe can damage the calibrator and the adapting sleeve.
In addition, there is a risk of injury due to abruptly evaporating
fluids and hazardous gases that may form when fluids evaporate.
Always ensure that the testing temperature is not too high for the
probe. Otherwise, the probe may be destroyed.
Remove all highly combustible media from the vicinity of the
device and ensure that the device cannot come into contact
with easily inflammable or explosive media.
2.2 Structure
Temperature dry well calibrators consist of an electrically heated
metal block and a control unit. The two components are
accommodated in a robust metal housing together with a fan. The
metal block is fitted with a bore in its centre for holding the
adapting sleeve. This adapting sleeve contains one or several bores
of different diameters for thermically coupling thermometers of
various thicknesses optimally to the heated metal block. Good
thermal coupling between the block, the adapting sleeve and the
thermometer is very important for keeping measuring uncertainty
during calibration to a minimum.
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9WIKA Operating Instructions CTD9300 Rev. 1
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2. Device Description
GB
Calibrators for Low Temperatures
If the calibrator generates temperatures lower than the ambient
temperature, it must be able to cool actively. In this case, the
isothermal block is made of aluminium and is cooled and heated
through Peltier elements. Depending on the polarity of the voltage,
the Peltier element will heat up on the top side while the opposite
side is cooled. One side of the element always makes contact to the
isothermal block. The other side is connected to a cooling element
that is cooled by a strong fan.
Through reversing the polarity and controlling the voltage at the
Peltier elements, the block can be heated and cooled. For technical
reasons, the max. attainable temperature with Peltier elements is
limited to approx. 165 °C. Depending on the model, the min.
attainable temperature is -50 K to -60 K relative to the ambient
temperature.
Calibrators for High Temperatures
High-temperature calibrators for temperature ranges of from 40 °C
to 650 °C generally work with resistance heating elements.
Depending on the upper limit temperature, different block materials
are used. Brass, bronze or scale-resistant steels.
Due to the low temperatures caused by the permanently decreasing
cooling capacity of the air flow surrounding the block, the control
unit starts working sufficiently fast only at 20 K above the
respective ambient temperature. This limits the lower working
temperature of a device of this kind to approx. 40 °C.
The upper limit is defined through the block material used and the
temperature resistance of the heating elements used.
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2. Device Description
Description of the Controls
Fig. 2: User Interface of a
CTD9300
The control panel with the keyboard, the pilot lamp and the graphic
display are on the front of the calibrator.
Description:
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A Standby / On pilot lamp
B Standby / On switch
C Cursor and Select keys for
marking and selecting
D Back key for going back one
step
E Enter and Clear keys for
F Measure / Control switch
G Block of 12 keys for
entering numbers with
sign
H Status bar of the display
I Main display area
K Info line of the display
entering and deleting data
The power socket and the 9-pin Canon socket of the RS 232
interface are on the rear of the device, the power socket and safety
fuse are arranged in the bottom of the device. For this reason, a
power cable with an angled inlet connector must be used.
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2. Device Description
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Fig. 3: Power switch and RS 232 connector
Power switch
The power switch (I/0 toggle switch) on the rear
of the calibrator is used to switch on the power
supply of the calibrator. Switch setting "I"
switches the power supply on, switch setting
"0" switches the power supply off.
Directly to the right of the power switch is a warning symbol.
It means: "Caution, general point of hazard"
RS 232 Connector
Devices that are connected to the RS 232 interface must comply
with the IEC 60950 standard.
The exact location of the power switch can be seen in the
illustration of the mechanical structure in the next section.
Mechanical Structure
Fig. 4: Mechanical structure of a
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2. Device Description
2.3 Functional Description
The two devices have identical operating functions, independent of
the different heating principles - Peltier elements in the case of the
165 °C version and resistance heating elements in the case of the
650 °C type.
CTD9300-165 for the range from -30 °C to 165 °C
CTD9300-650 or the range from 40 °C to 650 °C
Both the temperature dry well calibrators are fitted with an
electronic temperature-controlled heating block. This heating block
is fitted with a 28 mm x 150 mm bore for holding the adapting
sleeve.
In this heating block, you can insert adaptor inserts, generally
referred to as adapting sleeves, with one or multiple test bores,
which act as an adapter between the probe (temperature switch,
thermocouple, thermometer or resistance thermometer) and the
heating block bore. The heating block is thermically insulated
against the housing wall.
In the central area of the graphic display (I), the temperature of the
heating block and the set nominal value is displayed with a
resolution of 0.01 K.
The desired heating block temperature is predefined using the
block of 12 keys (G). After confirming the new nominal value with
the ENTER key (E) and switching from measuring to control mode
with the CONTROL key (F), the control unit will start setting the
calibrator to the topical nominal temperature.
In the Info line (K), the displayed mode will change from MEASURE
to CALIBRATE. The operating status HEAT UP, COOL DOWN and
TEMP. STABLE is displayed in the status bar (H).
The temperature is considered STABLE when it changes by less
than 0.1 K within 5 s. Only when the ramp program is enabled does
the STABLE display depend on the set stability criteria tolerance
and duration.
In addition to the topical block temperature, the set nominal value
and the standard deviation or the minimum and maximum values of
the block temperature can be displayed. Using this information, it is
possible to draw a conclusion about the stability of the temperature
in the calibrator at first glance.
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2. Device Description
GB
Standard deviations as well as the min. and max. values can be
reset at any time by pressing the ENTER (E) key.
2.4 Standard Accessories
Power Cable
A power cable with a 90 ° angled inlet connector for the power
supply is included with every calibrator. Depending on the country
the calibrator is delivered to, the power cable is fitted with the
locally used power plug.
Adapting Sleeve
Each calibrator is delivered ex works with an adapting sleeve with
an inside diameter of 6.5 mm. Most of the industrial thermometers
can be adapted to the calibrator through this sleeve.
If the diameters of your thermometers differ, please order the
desired adapting sleeve with an internal bore matching the diameter
of your thermometer plus 0.5 mm.
Sleeve Removal Tool
A sleeve removal tool for simple and easy removal from and
insertion of the adapting sleeve into the calibrator block is included
in the standard set of accessories of every temperature calibrator of
the CTD9300 series.
Data Cable
A data cable for connecting the calibrator to the RS 232 interface is
included in the scope of delivery of each device. The PIN layout
plan for 9-pin and 25-pin Sub-D connectors can be found in the
Appendix, refer to section 6.6: PC Connection.
2.5 Special Accessories
The special accessories are not included in the standard scope of
delivery.
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2. Device Description
2.5.1 Special Adapting Sleeves
Sleeves for CTD9300-165 calibrators are made of aluminium,
sleeves for CTD9300-650 calibrators are made of brass. The
outside dimensions of the two sleeves are Ø 28 mm x 150 mm of
length.
Special adapting sleeves can be customized in various designs.
Sleeves with multiple bores are also available. Limits are placed
only by the mechanical machinability of the sleeve blanks.
When choosing the sleeve design, however, please observe that the
overall measurement uncertainty declines with an increasing
number of bore holes and with increasing bore diameter.
The actual measuring uncertainty when using a special adapting
sleeve can be determined only when the bore diameter and the
number of bores as well as the design and material of the
thermometers to be calibrated is exactly known.
If you require multiple sleeves, please take the following into
consideration:
if possible, the bores should be arranged on a pitch circle to
ensure uniform temperature distribution.
for product engineering reasons, there must be a minimum
distance between the bores and to the edge of the sleeve. As a
rule, this distance should not be less than 2 mm.
the bore diameter should be larger than the thermometer to be
tested by at least 7 %.
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2.5.2 Transport Case
As an option, we offer a robust transport case for your calibrator.
We recommend the use of a transport case, if you frequently use
the device for on-site calibrations and thus need to transport it
often.
The case does not only protect your calibrator against environmental influences such as dust, dirt and humidity but also against
mechanical damage that may occur due to impacts and vibrations.
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2. Device Description
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2.5.3 Integratable Measurement Value Logging
In the measurement and control workshop, a measuring instrument
is required for connecting the probe that measures thermovoltages, resistance and 4-20 mA standard signals and displays
them in degrees centigrade.
In combination with the calibrators of the CTD9300 family, the
integratable measuring instrument CTI 9350 is a useful supplement
to your calibration equipment. The measuring instrument can be
integrated in the housing of the CTD9300 calibrators. Order the CTI
9350 directly or upgrade your device later on. We offer you the
choice. In the case of an upgrade, the front panel is simply replaced
in the works.
The temperatures of the two thermometers - of the reference and
the probe - can be displayed at the same time and simply compared
to one another.
The following can be connected as probes:
Resistance thermometers: Pt 100, Pt 500 und Pt 1000 in 2, 3 or
4 wire circuits
Thermocouples of the K, J, N, E, R, T, B, S, L and U types
4-20 mA power signals from temperature transducers, with and
without supply voltage
Temperature switches with "normally open" and "normally
closed" contacts.
The reference resistance thermometer is connected using a 7-pole
connector.
Three different connection possibilities have been provided for the
probe:
Binding posts for 4 mm connectors, spade connectors and
blank wires
Standard thermo-connector
Miniature thermo-connector
The 4 mm sockets (1, 2, 3 and 4) are generally used for connecting
the resistance thermometer, temperature switches and 4-20 mA
signals. All the three connection versions are available for
thermocouples.
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2. Device Description
All the thermometer signals are linearised according to their signal
type and displayed in °C, °F or in K.
The sensor type, input and switch technology are set in the menu
for measuring instrument setup.
Circuit of the Integrated Measuring Instrument
Fig. 5: Connectors of the instrument
External Reference Thermometer
The integrated measuring instrument
permits parallel connection of a probe
and, if desired, of an external reference
resistance thermometer. It takes the
characteristic curve of the reference
thermometer into consideration for the
linearisation using an individual
correction function, refer to the
adjustment menu.
An external reference may be required for certain calibration tasks,
e.g.:
when calibrating especially short sensors
for additional safety
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2.5.4 Software
Powerful software is available for all devices of the CTD9300
series. This software enables remote control of the calibrator and
the integrated measuring instrument through a computer and
automatic calibrations. The program runs on all IBM compatible
PCs.
Temperature Ramp Function
The temperature ramp function permits the recording of a
temperature curve that automatically approaches up to 20 settable
test points. This is a typical procedure for calibrating electric
thermometers.
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2. Device Description
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When thermometers are calibrated that cannot be read out
electrically, a dialog box for entering the measured value will be
opened. In this case, an integrated instrument is not required.
Fig. 6: Temperature ramp function
Temperature Cycle Function
The temperature cycle function permits the recording of a
temperature curve that automatically switches between two
adjustable set values. In this case, the dwell time of the lower and
upper temperatures as well as the heating and cooling rates can be
set in K/min. The number of temperature changes is preset in the
beginning.
Series of Probes Testing Function
If multiple probes are to be calibrated at the same temperature, e.g.
when testing goods received, the "Check Series of Measurement"
mode must be selected. After the measured values have been
recorded, they can be output as a table and graphically in the form
of a histogram.
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2. Device Description
Temperature Switch Testing Function
Recording of the heating and cooling switch points of
temperature switches within an adjustable temperature range.
Fig. 7: Temperature switch test function
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Remote Control
This function is used for displaying topical measured values of the
probe and calibrator as well as for programming the temperature
calibrator. It permits a simple check of the communication between
the devices.
Evaluation
Display and printing of the recorded temperature curves in the form
of a table or graphics as well as documentation of the measured
values in the form of a plant calibration certificate. The calibration
data are saved in a database and archived and are thus also
available for evaluations later on.
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2. Device Description
DGB
System Requirements
IBM-compatible PC with min. 486 processor with Windows 95, 98,
NT 4.0, 9x, ME, 2000 and XP operating system and a main memory
of at least 64 MB, CD-ROM drive or 3 ½" FDD 1,44 MB, VGA
graphics board and monitor, free RS 232 serial interface and
Microsoft-compatible mouse.
2.5.5 DKD Calibration Certificate
The DKD calibration certificate gives the user the certainty that the
calibration results are based on national standards and the errors of
measurement do not exceed the error limits specified.
DKD calibrations are optionally available for all temperature
calibrators. They are an option, the price of which depends on the
number of test points required. For temperature dry well calibrators,
DKD calibrations are generally performed at 6 test temperatures.
The measuring uncertainty specified in the DKD calibration
certificate depends on the device and temperature.
Calibration is a matter of trust. For this reason, entrust only our
competent DKD calibration workshop that has been certified in
compliance with the applicable standard (currently DIN EN ISO/IEC
17025) with the calibration of your valuable devices.
DKD laboratories are subject to periodical inspections by the PTB
(Physikalisch-Technische Bundesanstalt = the German National
laboratory). The laboratory employees are permanently trained and
educated further. Regular inter laboratory comparisons prove that
the minimum measuring uncertainty are really adhered to.
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3. Moduses and Functions
3. Moduses and Functions
After switching on the calibrator, an information window will be
displayed for approx. 5 s. Then the device switches to measuring
mode. The current block temperature is displayed. The control unit
is switched off.
In the following, the menu structure is displayed in simplified form.
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Fig. 8: Menu structure of a
CTD9300
The menu items for datalogger, RTD, TC and mA tests as well as
switch tests are accessible only, if a measuring instrument is
integrated, otherwise they will be hidden.
The two operating modes for measuring and calibrating and the
functions of the Setup menu are described in the following.
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3. Moduses and Functions
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3.1 Setup Menu
Press the SELECT key in the measurement or calibration mode to
access the Setup menu. It is subdivided into:
Basic setup menu
Measuring instrument setup menu
Adjustment setup menu
Select the individual menu items using the cursor keys and the
SELECT key. Press the BACK key to exit the menus.
If you make a selection within a menu, it must be confirmed with
the SELECT key before exiting the menu.
Fig. 9: Setup menu with user interface of a
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3. Moduses and Functions
3.1.1 Basic Setup Menu
The basic setup menu is used for typical settings relating to the
general operation of the device, e.g. for calling the Info window that
provides information on the current hardware and firmware
versions or enables editing of the system and display parameters.
The step menu, e.g. can be used to create temperature profiles and
approach them cyclically.
3.1.1.1 Info Menu
The Info menu displays data on the measuring range, the date of
the last calibration, the current firmware ramp and the serial number
of the device.
Depending on the device type, one
of the following measuring ranges
will be displayed:
CTD9300-165 the measuring
range of from -30 °C / 165 °C
CTD9300-650 the measuring
range of from 40 °C / 650 °C
Fig. 10: Info menu of a
CTD9300
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The user cannot edit the settings in this window. The firmware
ramps will change accordingly after an update.
The individual serial number of the calibrators is displayed in the
Info menu and additionally on the type label on the rear of the
device.
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3. Moduses and Functions
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3.1.1.2 Display
The display menu is used for selecting the unit for displaying the
temperature and the desired calibration menu. In addition, the
averaging function of the temperature display can be set.
The desired menu item is
"enabled" using the cursor keys
and selected by pressing the
SELECT key. Selected units and
functions are identified by an
arrow.
Fig. 11: Display adjustment
Unit Selection
You can choose between degrees Celsius °C, degrees Fahrenheit
°F or Kelvin.
Calibration Menu Selections
If a measuring instrument is not integrated, you can choose
between the min./max. value and standard deviation menu items.
If a measuring instrument is integrated, the selection will be
supplemented with:
TC-Probe
Pt-Probe
mA-Probe
switch test
Only one menu can be selected at a time.
Min/max value
Apart from the current block temperature, the minimum and
maximum value of the block temperature will be displayed. Press
ENTER to set min. and max. to the topical measured value.
Using this function, it is easy to assess the maximum limits of
variation of the block temperature in stationary mode.
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3. Moduses and Functions
Standard Deviation
Instead of the min./max. value, the standard deviation is displayed
here, i.e. the mean quadratical error of the block temperature across
the last n measured values. After pressing ENTER, n = 0 is set and
the standard deviation will be recalculated.
Switch Test
Test menu for temperature switches, refer to
section 3.1.2 Measuring Instrument Setup Menu.
TC-Probe Menu
Calibration menu for thermocouples, refer to
section 3.1.2 Measuring Instrument Setup Menu.
Pt-Probe Menu
Calibration menu for resistance thermometers, refer to
section 3.1.2 Measuring Instrument Setup Menu.
mA-Probe Menu
Calibration menu for thermometers with temperature transducers,
refer to section 3.1.2 Measuring Instrument Setup Menu.
Display Averaging
The actual value of the block temperature displayed by the device
can correspond to the current temperature or be an average across
2 to 99 measured values. The average is continuously calculated
from the last n measured values according to the FIFO method. A
measuring rate of approx. 4 values/s, the following settings result
for the number of average values:
1, averaging disabled
40, averaging for 10 s
99, averaging for 25 s
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To ensure a steady display, we recommend averaging across 50
measured values, which corresponds to an integration time of 13 s.
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3. Moduses and Functions
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3.1.1.3 System
This menu is used for setting the system functions.
Language Selection
In this menu, the user can
select one of the languages
German, English, French or
Spanish using the cursor keys.
The selection must be
confirmed with SELECT.
Fig. 12: System adjustment
Time and Date
The system time and date are selected block by block using the
cursor keys and entered via the numeric keypad. [ hh -> mm -> ss ]
and [ 20yy -> mm -> dd ]. Confirm your entry with ENTER.
Display Settings
Brightness and contrast can be set via the numeric keypad within
the range of from 0 % to 100 %.
Confirm your entry with ENTER.
The following settings are recommended:
Brightness: 80 %
Contrast: 60 % (contrast settings < 50 % are not advisable)
Alarm
When the preselected alarm temperature is exceeded, "temp. to
high" flashes in the information line. The alarm temperature is
entered via the numeric keypad and must be confirmed with
ENTER.
Cut-out
When the preselected switch-off temperature has been exceeded,
the device will automatically be reset to the measuring mode, i.e.
the control unit is switched off. "temp. to high" will flash in the
information line. The device will cool to ambient temperature. The
switch-off temperature is entered via the numeric keypad and must
be confirmed with ENTER.
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Temperature Dry Well Calibrators CTD9300
3. Moduses and Functions
Operating Hours
The operating hours counter continuously counts the time in
hours, for which the device is switched on.
Heat units
The heat units factor is a characteristic value for the thermic load of
the device. It permits conclusions on the average working
temperature of the temperature calibrator. The average working
temperature in °C is calculated as follows by approximation:
t
= t
average
where t
+ ( heat units x 100 / operation hours )
amb.
is the ambient temperature in °C.
amb.
3.1.1.4 Ramp Program
The ramp program with the associated auxiliary parameters is
enabled in the ramp menu. It is used, e.g. for checking recording
temperature measuring instruments.
Another field of application is
the temperature change test,
which makes it possible to draw
conclusions on the
reproducibility, the hysteresis
and the long-term and shortterm stability of temperature
sensors.
Fig. 13: Ramp menu
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If a measuring instrument is integrated in the calibrator, the
measured values of the probes can be recorded at the selected
temperature ramps. Please also refer to the section DataLogger in
Chapter Measuring Instrument Setup Menu.
Temperature Ramp Function
The temperature ramp program is switched on by selecting the UP
and/or DOWN function with the cursor. The default setting is OFF.
In the ramp program, 6 different temperature ramps can be enabled
individually or together. For this purpose, the ramps are selected
with the cursor and enabled/disabled with the SELECT key. Every
single temperature ramp can be set to any desired temperature
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Temperature Dry Well Calibrators CTD9300
3. Moduses and Functions
GB
within the operating range of the calibrator.
The resolution is 0.01 K.
The individual temperature ramps are serially numbered from 1 to 6.
If the "UP" function is enabled, the ramps are approached in the
order 1, 2, 3, 4, 5 and 6. If the "DOWN" function is enabled, the
ramps are approached in the order 6, 5, 4, 3, 2 and 1. If both
functions are enabled, the ramps are approached in the order 1, 2,
3, 4, 5, 6, 5, 4, 3, 2 and 1. Disabled ramps are skipped.
Gradient
Using the gradient function, defined heating and cooling of the
calibrator can be set. The value for the gradient is set in K/min with
a resolution of 1 K.
The upper ramp for the gradient is determined through the heating
power of the respective device. This means that the device with the
gradient function enabled cannot heat at a faster rate than with the
gradient function disabled. The gradient function is primarily used
for checking temperature switches. To prevent the switch point of a
temperature switch from being exceeded during heat-up, the
calibrator is heated only slowly. Gradients between 1 K/min and
5 K/min are typical. Especially for temperature switches with large
immersion tube diameters, this prevents that the temperature of the
switch lags behind that of the calibrator.
Tolerance and Duration
Using the Tolerance and Duration functions, the stability and
length of the dwell time on a temperature ramp can be set. If the
dwell time is to be 5 minutes with a stability of ±0.1 K after the
nominal temperature has been reached, the duration must be set to
5 min and the tolerance to 0.1 K. In this case, the timer will start
when the actual temperature differs by less than 0.1 K from the
nominal temperature. If the temperature remains within this
tolerance for 5 min, the time period for the next ramp will be
approached after the present time period has elapsed. If
fluctuations occur during this time that exceed the set tolerance,
the timer is reset and restarted. When the tolerance has been
reached, TEMP. STABLE is displayed in the status bar.
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Temperature Dry Well Calibrators CTD9300
3. Moduses and Functions
The tolerance can be set within the limits of 0.01 K and 5.00 K,
the duration within the range of from 1 min to 100 min.
Cycles
Using the Cycles function, the calibrator can approach the ramps
continuously. If e.g. the temperature ramps 1, 2 and 3 are enabled
and the "UP" function has been selected, the ramps 1, 2 and 3 are
approached one after the other depending on the set cycles: with a
number of cycles of 3 this would be 1, 2, 3, 1, 2, 3, 1, 2 and 3.
If the "UP" and "DOWN" functions have been selected, the
calibrator will proceed as follows: 1, 2, 3, 2, 1, 2, 3, 2, 1, 2, 3, 2
and 1.
This function is especially useful for temperature change tests on
temperature sensors.
If the ramp program is enabled, set-values cannot be entered
via the keyboard. The keyboard will remain locked until the
temperature ramp function is disabled.
3.1.2 Measuring Instrument Setup Menu
The measuring instrument setup menu is available only if the
calibrator is equipped with an integrated measuring instrument.
The menu is used for configuring the data logger and the
calibration processes of temperature switches, thermocouples,
resistance thermometers and 4-20 mA temperature transmitters.
The menu is hidden if the calibrator is not equipped with an
integrated measuring instrument.
The integrated measuring instrument makes it possible to measure
various sensor signals and to convert them to degrees Centigrade
according to standardised characteristic curves. It is also possible
to detect switch points of temperature switches. The data logging
function permits storing as many as six probe temperatures and the
nominal temperature per probe given by the calibrator. In total, the
calibration data of up to eight probes can be recorded.
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29WIKA Operating Instructions CTD9300 Rev. 1
Temperature Dry Well Calibrators CTD9300
3. Moduses and Functions
GB
The following devices are supported:
Pt resistance thermometers with characteristic curves in
compliance with EN 60751
Thermocouples in compliance with EN 60584 and DIN 43710
2-wire temperature transducer with an output signal of
4-20 mA
Temperature switches with "normally closed" or "normally open"
contacts.
3.1.2.1 Data Logger
This menu is used for configuring the data logger. The data logger
permits the storage of calibration results of up to eight calibrations.
In this case, a calibration can include up to six testing
temperatures. A prerequisite is that the ramp program is enabled
and the desired testing temperatures have been set in advance in
this program.
The last cycle is always stored,
independent of whether the
levels were approached from
bottom to top or vice versa. For
this reason, it is best to set the
number of cycles to 1 when
recording measured values.
Fig. 14: "Data Logger"
setup menu
When the data logger is disabled, sets, i.e. the measured value
storages can be selected via the cursor keys. It is possible to select
Set1 to Set8.
One set may hold up to 6 measuring results. If e.g. only four
measurements are made, the remaining two rows of the value table
remain empty.
When the data logger is switched on, the measuring results are
stored in the current set. It is not possible to change the set when
the data logger is enabled.
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