Datcon DT9500 Operating Instructions Manual Download

Page: 68 / 100

DT9500

20220103-V2

10.3. Error messages

The instrument has a sophisticated self-testing function; it
is capable of detecting the majority of the errors. All
mnemonics (code words) presented on the display comes
from English expressions in abbreviated form.



A/D overflow

(

rror:

A/D

verflow)

The loop current is too high, it cannot be measured.

he Pt100 (or wiring) is faulty.



Error measurement

(

rror:

uremen

)

Measuring not possible.
The Pt100 is faulty (short-circuit or breaking).



Underflow

(

rror:

nder

low)

Temperature is lower than -200 ºC.



Overflow

(

rror:

ver

low)

ver

low (

rror:

ver

low)

Temperature is higher than 600 ºC.



Missing minimum - maximum value

(

rror:

issing

inimum-

aximum)

The minimum value and the maximum value that has been
continually stored since the latest deletion has got deleted
due to an operating fault.

Remedy

: there is nothing to do.

Summary of Contents for DT9500

Page 1: ...DT9500 Intrinsically Safe Temperature Meter Transmitter Operating Instructions ...

Page 2: ...ental instructions 6 3 Product description 7 3 1 Delivery configuration 7 3 2 Principle of operation 7 3 3 Settings 9 3 4 Storing and transporting 9 4 Mounting 10 4 1 General instructions 10 4 2 Main dimensions of the instrument 10 4 3 Mounting as a wall instrument 11 4 4 Mounting as a panel instrument 14 5 Connecting 16 5 1 Connecting into the current loop 16 6 The display and the operating devic...

Page 3: ...he user code 10 menu item 54 7 13 Changing the supervisor code 11 menu item 56 7 14 Display operating modes 12 menu item 58 7 15 Disable displaying the leader zeros 13 menu item 60 7 16 Clear minimum and maximum values 14 menu item 62 7 17 Resetting the default settings 15 menu item 63 8 Fault rectification 64 8 1 Fault finding 64 8 2 Repairing 64 9 Dismounting 64 9 1 Dismounting procedure 64 9 2 ...

Page 4: ...se personnel and put into practice by them 1 3 Symbolism used Information tip note This symbol indicates helpful additional information Caution warning danger This symbol informs you of a dangerous situation that could occur Ignoring this cautionary note can impair the person and or the instrument Ex applications This symbol indicates special instructions for Ex applications List The dot set in fr...

Page 5: ... its LCD display Between two settable temperature values it takes a linear 4 20 mA current signal from the power supply unit transmitter function Detailed information on the application range of the DT9500 is available in chapter Product description 2 3 Warning about misuse Inappropriate or incorrect use of the instrument can give rise to application specific hazards or demage to system components...

Page 6: ...areas These safety instructions are part of the operating instructions manual and come with the Ex approved instruments 2 7 Environmental instructions Protection of the environment is one of our most important duties Please take note of the instructions written in the following chapters Chapter 3 4 Storage and transport Chapter 9 2 Disposal ...

Page 7: ...1 instrument case 2 front panel with 3 membrane push buttons 3 2 Principle of operation Application fields The apparatus DT9500 is a loop powered intrinsically safe temperature meter and transmitter instrument fed by 4 20 mA loop current It works with a standard Pt100 measuring probe which is not an accessory of the instrument The device presents the temperature measurement values in digital forma...

Page 8: ...PI and PI lines are identical with each other the voltage dropping in these lines does not influence the accuracy of the measurement A built in microprocessor is used to calculate the temperature values The results are presented on a 4 and half digit LCD display The limit outputs work in accordance with the displayed temperature values The 4 20 mA current of the transmitter output could be assigne...

Page 9: ...ther factory default settings e g setting the device to 3 wire operating mode could be performed simply and easily by using the press buttons on the front panel The instrument doesn t need any internal adjustment 3 4 Storing and transporting This instrument should be stored and transport in places whose climatic conditions are in accordance with Chapter 10 1 Technical specifications as described u...

Page 10: ...and connecting the instrument and that minimises the hazard of water dust or dump getting into the instrument Mounting cable entries The insrument is equipped with two PG11 cable entry and one additional hole equipped with sealing plug One PG11 cable entry is accessory If required more than two cable entry see chapter 5 put out the sealing plug turning it in anticlockwise direction To put in the c...

Page 11: ...rivers with inappropriate head size may cause a damage in the screws heads or in the instrument front panel Remove the screws by turning them in anticlockwise direction as shown in the drawing Step 1 The screws are secured against falling out After this you can simply take away the front cover from the housing 2 and you can open it by turning it downwards 3 Plastic ties are used to fasten the fron...

Page 12: ...wing for the fastening of the housing The diameters of the holes are made for M3 screws Holes for mounting 1 Mark the places of the holes in accordance with the drawing 2 Make the holes for mounting ready 3 Remove any burrs from the ready made holes Please observe the safety rules throughout the operation ...

Page 13: ...ding on the material of the wall and in order to ensure the most practicable mounting method it is not mandatory of course to use the above described threaded joints Depending on the situation special screw types for wood or for metal sheets can also be used or the joint can be riveted too Mounting the front cover back to its place 1 Check if there are alien materials left in the housing like smal...

Page 14: ...3 V2 4 4 Mounting as a panel instrument Preparatory steps 1 Cut out the panel according to the figure shows below The cut out needs spetial tools it must be carried out by trained specialist personnel Cut out dimensions ...

Page 15: ...ep 2 3 Put the instrument into the prepared cut out until it possible and check the fitting of the seal between case and mounting surface 4 Put on the enclosed screw clamps onto the sides of the instrument case Figure step 4 1 4 2 Fix the instrument by turning the srews in clockwise direction Figure step 4 3 Pay attention not to let pointed sharp metal parts cause accidents ...

Page 16: ...tion cable A four wire twisted pair shielded cable should be used for connecting the measuring probe Pt100 to the apparatus It is also possible to use three wire cables but the measurement accuracy will deteriorate due to the asymmetry of the resistances of wires and due to the incertainty of contact resistances For connecting the loop feeding a two wire twisted pair shielded cable must be used Fo...

Page 17: ...onnected with each other see also Application example Be careful the polarity of the cables The most accurate measurement can be achieved by the 4 wire operating mode as the cable resistances and their possible asymmetry will not cause measuring errors In order to ensure accurate measurement its usage is absolutely recommended ...

Page 18: ... results in less accurate measurement than the 4 wire operating mode as the different resistances of the cable wires their asymmetry and the various temporary resistance values of contacts cause additional measurement errors The use of this mode is recommended only for those cases that are satisfied by less accuracy In all other cases it is practicable to use the 4 wire operating mode according to...

Page 19: ...flow over the cable screen In case of grounding on both sides for suppress the influence of high frequency interference signals this can be achived by use of a capacitor e g ceramic capacitor 1 nF 1500 V or separate potential equalisation The low frequency potential equalisation currents are thus supressed but the protective effect against high frequency interference signals remains Inserting the ...

Page 20: ...n the case of flexible cable ends you can facilitate opening the connection part by pushing down the white button 2 By pushing the wire in the self closing connection is being established Check it by pulling it outwards slightly 3 When you disassemble the cable push down the white button by a screwdriver and pull the cable end out There is no need to use great force for pushing the cable in neithe...

Page 21: ...r voltage if possible If the connection is perfect some numbers or a text appear on the display If nothing appears on the display most probably the apparatus does not get supply power With a voltage meter instrument check if there is voltage between I and I connection points If the measurement shows that the voltage value is higher than 12 V then this error possibility can be excluded In the next ...

Page 22: ...y If it is 123 7 C then As the factory default setting of the apparatus is 4 wires for Pt100 connection the displayed value will be accurate in that case only if actually 4 wires are used for the connection If a 3 wire physical connection is used the setting of the apparatus must also be changed to this mode in order to ensure accurate measurement Chapter 7 2 menu 04 In the case of error messages ...

Page 23: ...orm The following part gives a list of the possible mnemonics and their meaning The left side column shows the characters appearing on the display The right side column gives first the meaning then the full English word in brackets and after the hyphen and explanation may be given Login text DT Datcon instrument 9502 Type of the instrument The device is preparing for the measurement Error messages...

Page 24: ...in took place User A Supervisor login took place Supervisor During setting up The typed number is lower than allowed Low Limit The typed number is higher than allowed High Limit Low numeric value not possible to display High numeric value not possible to display Re type it please Re type Automatic escaping Auto Escape after 1 minute Exit from the setting Exit The instrument is making calculations ...

Page 25: ...Ximum Firmware version FiRMwareE Low numeric value not possible to display High numeric value not possible to display Limit values on the display Both limit outputs are switched off The limit output No 1 is switched on Limit 1 The limit output No 2 is switched on Limit 2 Both limit outputs are switched on ...

Page 26: ...ng the code password in when the right code has been given it enters into the menu During this time the measurement is suspended and the limit outputs don t change If no keys are pressed for a period of one minute the instrument restarts and the measurement goes on 2 button displaying minimum value maximum value firmware version The above values and the firmware version remains on the display as l...

Page 27: ...e as long as you see this The mnemonic indicates that it will be displayed the firmware version 6 Keeping the button pressed down after 1 5 sec the firmware version will be displayed as long as the button is pressed down Format Y M DD where Y year H month and NN day Comments Pressing the button repeatedly the above process starts from operation 1 enable to display the three values sequentially Whe...

Page 28: ...It s functionality depends on the operating mode of displaying the limits In default factory setting this function is switched off therefore pushing the button does not cause any changes Detailed description is in Chapter 7 3 Display modes of limit output status Other function in Alarm Mode it switches the limit output off ...

Page 29: ...g the code in 1 Press the MENU button The blinking mnemonic shows that the device is asking for the code 2 Three zeros appear The zero at the left side is blinking Pressing the button you can increase the value of the blinking number etc Pressing the button to select the next digit 3 Pressing the and the buttons type in either the user code or the supervisor code 4 Press the MENU button If a corre...

Page 30: ...splays the mnemonic Auto Escape after 1 minute has passed from the last pressing of a button and it RESTARTS i e goes back to the measuring mode This solution is due to security unauthorised persons after 1 minute will not be able to change the settings of the instrument should it be left alone for some reason ...

Page 31: ...perature 4 mA 43 page 06 Temperature 20 mA 45 page 07 Averaging number 47 page 08 Display refresh time 49 page 09 Tests 51 page 10 User code 54 page 11 Supervisor code 56 page 12 Display mode 58 page 13 Leader zeros 60 page 14 Min and max erase 62 page 15 Default 63 page Comment The menu items shown in grey appear only in the case of a supervisor level login ...

Page 32: ... state of limit outputs default factory setting Dynamic button Dynamic Button It displays the state of limit outputs as long as the ENTER button is kept pressed Timed button Timed Button It displays the state of limit outputs for a period as long as the ENTER button is kept pressed for 2 5 seconds Static button Static Button Displaying the state of limit outputs can be switched on off by pressing ...

Page 33: ... the given menu item and you see 2 If you want to change the settings you have done just now or if you just want to check what you have typed in go on with the operation from point 2 of the Sequence of operations 3 If you don t want to exit the menu you want to do further settings then you may select the desired menu items by pressing the button Exit from the menu 1 Press the MENU button First the...

Page 34: ... 1 Typing the code in You see on the display 2 Keep stepping by pressing the button as long as you see this menu item 3 Enter the menu item by pressing the ENTER button 4 You see the mnemonic on the display L1 Limit 1 means limit output No 1 SS Settings means settings Here you can define the operating mode for the limit output Enter by pressing the ENTER button the output is always in switched off...

Page 35: ...mit value Here you can define the numerical value by which the device will compare the measured physical values 9 Enter by pressing the ENTER button 10 You see this on the display and the arrow is blinking in the upper left corner The arrow indicates that the uppermost digit the half digit is being selected from the 4 and half digits and now it can be modified by pressing the button 11 Pressing th...

Page 36: ...ce of operations 16 Keep stepping by pressing the button as long as you see this sub menu item LH Low Hysteresis means the hysteresis of the low limit value Here you can define a numerical value which provides the hysteresis of the low limit value LL by having added to and subtracted from it Consequently the actual hysteresis is twice the value defined here View of the used terms Comment according...

Page 37: ...o further settings For finishing the operation go on with the steps from the part Exit from the menu item High limit value Sequence of operations Setting the high limit value and It s hysteresis is necessary in that case only if you had selected the or the operating mode 23 Pressing the button keep stepping as long as you see this sub menu item HL High Limit means the high limit value Here you can...

Page 38: ...e limit press the MENU button to exit from the sub menu item and you see this 31 L1 HL must not be lower than L1 LL Should the case be this the instrument call attention you by a blinking mnemonic and exchanges the wrong value to the lowest permissible value Hysteresis of the high limit Sequence of operations 32 Keep stepping by pressing the button as long as you see this sub menu item HH High Hys...

Page 39: ...to exit from the given menu item and you see this 2 If you want to change the setting you have done just now or if you just want to check what you have typed in go on with the operation from point 2 of the Sequence of operations 3 If you don t want to exit the menu you want to do further settings then you may select the desired menu items by pressing the button Exit from the menu 1 Press the MENU ...

Page 40: ...by pressing the button as you see this sub menu item Alarm Mode 5 Enter by pressing the ENTER button 6 You see this on the display The mnemonic is blinking 7 You can switch the alarm mode on by pressing the button the limit output will switch off automatically when the condition that had caused it to switch on ceases to exist default factory setting switching the limit output off is possible only ...

Page 41: ...from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has exited the menu and goes on with the measurement ...

Page 42: ...ault setting measuring with 3 wires it results in less accurate measurement therefore it is strongly recommended to use 4 wires for connecting the probe Pt100 to the apparatus and use the 4 wire measuring mode Exit from the menu item 1 After you have completed the setting press the MENU button With this you leave the menu item and you see this 2 If you want to change the setting you have just comp...

Page 43: ...to see how the code should be written in On the display you see this 2 Keep stepping with the button as long as you see this menu item 3 Enter the menu item by using the ENTER button 4 The number is visible on the display Digit 2 is blinking The blinking digit indicates which of the digits is selected The selection can be modified by using the button 6 Using the button you can go to the next digit...

Page 44: ...to check what you have written in go on with the operations from point 3 of the Sequence of operations 3 If you do not want to exit the menu as you want to do other settings too you may use the button to select the desired menu items Exit from the menu Press the MENU button First you see the script Save and then the script Exit With this the saving of the settings is ready The apparatus has left t...

Page 45: ... in to see how the code should be written in On the display you see this 2 Keep stepping with the button as long as you see this menu item 3 Enter the menu item by using the ENTER button 4 The number is visible on the display Digit 4 is blinking The blinking digit indicates which of the digits is selected The selection can be modified by using the button 6 Using the button you can go to the next d...

Page 46: ...yped in go on with the operation from point 3 of the Sequence of operations 3 If you don t want to exit the menu as you want to do further settings then you may select the desired menu items by pressing the button Exit from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has e...

Page 47: ... Chapter 7 1 Typing the code in You see on the display 2 Keep stepping by pressing the button as long as you see this menu item 3 Enter the menu item by pressing the ENTER button 4 You see this on the display The number is blinking 5 Pressing the button select the number of measurements to be averaged for the displayed numerical value The displayed value is the average of the last 8 measurements D...

Page 48: ...f the input signal 0 3 seconds Exit from the menu item 1 After finishing the setting press the MENU button to exit from the menu item and you see this 2 If you want to change the setting you have done just now or if you just want to check what you have typed in go on with the operation from point 3 of the Sequence of operations 3 If you don t want to exit the menu as you want to do further setting...

Page 49: ... way the code should be type in is described in Chapter 7 1 Type the code in You see on the display 2 Keep stepping by pressing the button as long as you see this menu item 3 Enter the menu item by pressing the ENTER button 4 You see this on the display It s meaning 0 5 seconds The 0 5 numerical value is blinking 5 Pressing the button select the time periods by which the instrument should display ...

Page 50: ...d in go on with the operation from point 3 of the Sequence of operations 3 If you don t want to exit the menu as you want to do further settings then you may select the desired menu items by pressing the button Exit from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has exit...

Page 51: ...e display get switched on By pressing the button several times you can select from several test patterns by which you can decide whether the display is good or not You may exit from the display test by pressing the MENU button You see this again 6 If you want to test the limit outputs press the button to switch to the mnemonic from the mnemonic It s meaning Output test 7 Press the ENTER button 8 Y...

Page 52: ...tween 4 mA and 20 mA in 1 mA steps 15 By pressing the button again you may select from among the following operating modes 4 mA 12 mA 20 mA Stepping the current automatically fast It decreases the current value from 20 mA to 4 mA in 1 mA steps then increases it from 4 mA to 20 mA in 1 mA steps then decreases again and so on A complete sequence of stepping up and down takes 1 6 seconds Stepping the...

Page 53: ...from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has exited the menu and goes on with the measurement ...

Page 54: ...digit on the left side is blinking Pressing the button you can increase the value of the blinking digit etc Pressing the button you can select the next digit 3 Pressing the buttons and type in the new user code 4 Press the MENU button 5 You have to type the new code in twice This prevents an error in defining the new code due to typing mistakes This is indicated by the mnemonic re type 6 Pressing ...

Page 55: ...already left the menu item Changing the user code you see this 2 If you want to change the setting you have performed just now or if you just want to check what you have typed in continue the operation from Point 3 of the Sequence of operations 3 If you do not want to exit from the menu as you want to perform further settings you may press the button to select the desired menu items Exit from the ...

Page 56: ... side is blinking Pressing the button you can increase the value of the blinking digit etc Pressing the button you can select the next digit 3 Pressing the buttons and type in the new supervisor code 4 Press the MENU button 5 You have to type the new code in twice This prevents an error in defining the new code due to typing mistakes This is indicated by the mnemonic re type 6 Pressing the buttons...

Page 57: ...he menu item Changing the supervisor code you see this 2 If you want to change the setting you have performed just now or if you just want to check what you wrote in continue the operation from Point 3 of the Sequence of operations 3 If you do not want to exit from the menu as you want to perform further settings you may press the button to select the desired menu items Exit from the menu 1 Press ...

Page 58: ...u item by pressing the ENTER button 4 You see this on the display The mnemonic is blinking 5 You may switch between the two operating modes by pressing button four and a half digit operating mode Default factory setting three and a half digit operating mode In the three and a half digit operating mode the possible range of numbers to display is reduced to the values being between 200 0 and 200 0 E...

Page 59: ...from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has exited the menu and goes on with the measurement ...

Page 60: ... Enter the menu item by pressing the ENTER button 4 You see this on the display The text is blinking 5 You may switch between the two operating modes by pressing button the leader zeros are shown on the display default factory setting the leader zeros are not shown on the display Comment one zero directly before the decimal point is always shown on the display Exit from the menu item 1 After you h...

Page 61: ...from the menu 1 Press the MENU button First the mnemonic Save then the mnemonic Exit are shown on the display With this the storing of the settings is completed The instrument has exited the menu and goes on with the measurement ...

Page 62: ... want to clear the minimum and maximum values after all press the MENU button This takes you out from this menu item and you see this 5 If you want to clear the minimum and maximum values press the button to change the NO to YES I do not want to clear I want to clear Exit from the menu item 1 After you have performed the setting press the MENU button This takes you out from the menu item and you s...

Page 63: ...e this on the display 2 Keep stepping by pressing the button as long as you see this menu item 3 Enter the menu item by pressing the ENTER button 4 The mnemonic is shown on the display The mnemonic is blinking Now you still have the possibility to exit If you want to exit as you do not want to reset the default settings after all press the MENU button This takes you out from this menu item and you...

Page 64: ...it is recommended to notice of the displayed error message as well as of the phenomenon seen These information please communicate to the Datcon service personnel 9 Dismounting 9 1 Dismounting procedure The steps described in Chapter 4 Mounting should be performed in reverse sequence Upon dismounting the instrument observing all the safety rules is mandatory like upon mounting Only qualified and au...

Page 65: ...tance of the measuring probe Pt100 α 0 00385 Connecting to the sensor 3 4 wires Wire resistance 50 Ω 400ºC ig 10 Ω 600 ºC ig Display range 200 ºC 600 ºC Measuring current 800 μA Sampling rate 15 measurements second Number of averaged samples 1 2 4 8 16 32 adjustable Measurement error 0 3 ºC 200 ºC 400 ºC 0 4 ºC 400 ºC 600 ºC referring to the nominal resistance value Display manual controls Display...

Page 66: ...t 10 mA Load rating 10 V 16 mA max Ex safety data Refreshing time same as the display s one Hysteresis 0 99 9 Environmental conditions Environmental conditions Operating temperature range 20 C Ta 60 C Storing temperature range 25 C Ta 70 C Relativ humidity 90 max non condensing Place of installation Zone 1 Zone 2 safe area Electromagnetic compatibility EMC In accordance with MSZ EN IEC 61326 1 202...

Page 67: ...DT9500 20220103 V2 67 10 2 Application example ...

Page 68: ...not be measured The Pt100 or wiring is faulty Error measurement Error MeaSuremenT Measuring not possible The Pt100 is faulty short circuit or breaking Underflow Error Underflow Temperature is lower than 200 ºC Overflow Error Overflow Overflow Error Overflow Temperature is higher than 600 ºC Missing minimum maximum value Error Missing Minimum Maximum The minimum value and the maximum value that has...

Page 69: ... The memory storing the operation parameters is faulty therefore changing the stored parameters in not possible Repairing by the service Calibration error Service Calibration The instrument must be re calibrated in the factory Repairing by service Default Factory Settings Service Default Factory Settings The instrument needs to be re calibrated and the operating parameters have also got damaged Re...

Page 70: ...witched ON OFF by ENTER Automatically when changes Auto Change For a period of 2 5 sec after a change has taken place in the output Disabling by ENTER Automatically periodical Auto Periodical Periodical ON OFF in each 2 5 seconds Disabling by ENTER Always ON ON Disabling by ENTER Limit output configuration sub menu No 1 Limit 1 Detailed description in the chapters 7 3 7 4 7 5 Limit output configur...

Page 71: ...isplay Refresh The instrument performs cca 15 16 measurements in each seconds It s too fast to see the changing of the measurement value Here you can define the time periods by which the instrument displays the new measurement values Default factory setting 0 5 sec The submenu that contains the test programs Test Display test Test LCD Checking if the display works well Output test Test Output Test...

Page 72: ...by supervisor code only Display mode LCD four and a half digit mode 19999 19999 three and a half digit mode 1999 1999 Default factory setting four and a half digit Access is possible by supervisor code only Disable displaying leader zeros Leader Null the leader zeros are displayed Space the leader zeros are not displayed only one standing before the integer Default factory setting leader zeros are...

Page 73: ...Low numerical value not possible to display This mnemonic is displayed in that case when you have switched the display mode from four and a half digit to three and a half digit and the numerical value of a previously defined parameter does not fit to the display format 4 lines at the top of the display High numerical value not possible to display This mnemonic is displayed in that case when you ha...

Page 74: ...ith no value are not written on the display Entering the menu Use the supervisor code to enter the menu Read chapter 7 1 Writing the code in to see how the code should be written in On the dipslay you see this Setting the temperature value that belongs to 4 mA 1 Keep stepping with the button as long as you see this menu item 2 Enter this menu item by using the ENTER button 3 By the button you may ...

Page 75: ...e the menu item and you see this Disabling the leader nulls 1 Keep stepping with the button as long as you see this menu item 2 Enter this menu item by using the ENTER button 3 The text is visible on the display The text is blinking 4 Use the button to switch to the text 5 Press the MENU button With this you leave the menu item and you see this Exit the menu Press the MENU button First the mnemoni...

Page 76: ... assigned to the limit output No 1 Limit 1 Low Limit means that this is the lower one among the two limit values The high limit value is designated as where High Limit means that this is the higher one among the two limit values As the names indicate the value of the high limit must not be lower than the value of the low limit Therefore if you increase the value of the parameter and it happens to ...

Page 77: ...depending on the value of the measured and displayed physical signal Default factory setting OFF Detailed description on the following page Low limit value Low Limit It is one of the numerical values to which the instrument compares the measured signal continuously Default factory setting 0 Lo limit value hysteresis Hysteresis for LL This is the half of the hysteresis value that belongs to the low...

Page 78: ...mit A range outside the low and high limits It switches ON when measured value low limit OR measured value high limit Always switched ON Independently from the measured value the output is always ON The essentials about the hysteresis To each limit values can be assigned different hysteresis values To belongs To belongs The essentials about the hysteresis It makes it possible that the output shoul...

Page 79: ...steresis 0 ºC Example Hysteresis 0 A hysteresis with a value of zero means that the limit detection has no hysteresis The output switches ON when the value on the display reaches or is in excess of ºC and switches OFF when it goes lower than ºC again The following figure shows the essentials of hysteresis when it s value is higher than zero Figure Hysteresis 0 Figure Hysteresis 0 The following fig...

Page 80: ... 0 ºC How does it affect the switching of the output Example Hysteresis 0 When the displayed value increases the output does not switch ON at 100 0 ºC only at the value 100 0 1 0 101 0 ºC After it has switched ON and the signal begin to decrease it does not switch OFF as long as the value reaches the value of 99 0 ºC 100 0 1 0 It can be seen that the difference between the switching ON and OFF tha...

Page 81: ...imit output is always switched OFF It switches ON when measured temperature low limit The output switches ON if the displayed temperature numerical value defined as the In this operating mode the value of the parameter is indifferent it does not influence the operation of the output Example for the application Switching a cooling system ON above a given temperature value ...

Page 82: ...N if the displayed temperature value is lower than the numerical value defined as the parameter In this operating mode the value of the parameter is indifferent it does not influence the operation of the output Example for the application Switching ON a heating system below a given temperature value ...

Page 83: ...AND measured value high limit The output switches ON when the displayed temperature value numerical value defined as the parameter AND besides it is numerical value defined as the Example for the application It indicates that the measured temperature is between the desired limits ...

Page 84: ...ple for the application It indicates that the measured temperature out of the desired limits Displaying the limit values Switching the displaying on from the 04 LD menu item Both outputs are OFF Output 1 is ON output 2 is OFF Output 1 is OFF output 2 is ON Both outputs are ON If the Alarm Mode is ON and the given output is in alarm status the above displays appear blinking The blinking stops only ...

Page 85: ...n only acknowledgement Alarm mode Of course if the condition that causes the output to switch on persists the limit output will switch on again when the ENTER button is released Similary to working of fire alarm gear generates fire alarm Not suffice to definitive liquidation receipt signal alarming but must liquidate fire generative cause After switching on the instrument After switching on the in...

Page 86: ...place in those cases when the temperature goes at any time lower than 50 ºC or when it goes higher than 95 ºC The settings of the limit outputs are as follows operating mode Switches ON when the temperature is lower than the low limit Low limit ºC Hysteresis of the low limit ºC High limit ºC it s value is indifferent Hysteresis of the high limit ºC it s value is indifferent Alarm mode Operating mo...

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