WIKA CTD9300-165 Operating Manual

Operating Instructions Betriebsanleitung

Temperature Dry Well Calibrator

Temperatur-Blockkalibrator

CTD9300

Temperature Dry Well Calibrator CTD9300-165/650

Temperatur-Blockkalibrator CTD9300-165/650

Temperature Dry Well Calibrator Page 1 - 66

Temperatur-Blockkalibrator Seite 69 - 133

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Temperature Dry Well Calibrators CTD9300 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

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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WIKA Operating Instructions CTD9300 Rev. 1

Temperature Dry Well Calibrators CTD9300 Preface

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

1.1 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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Temperature Dry Well Calibrators CTD9300

1. General Instructions

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

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

2.1 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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Temperature Dry Well Calibrators CTD9300

2. Device Description

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

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

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

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

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

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

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

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

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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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

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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3. Moduses and Functions

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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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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3. Moduses and Functions

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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