background image

- 47 -

13.5. Entering the reference temperature value

When  the  measurement  is  made  in   

  and 

  unit  and  the 

(compenstion)  has  been  chosen,  the  reference  temperature  value  may  be
entered.  The  range  is  10.0 ÷ 40.0 

0

C  with  possibility  of  setting  every  0.1 

0

C.

The most frequent value is 25 

0

C.

To enter the reference temperature:

- in the coductivity measuring mode press the 

 button until the reference

temperature  value  displays  (Pic.  27).  The 

  (reference  temperature)

symbol will appear;

- with the 

 , 

 buttons enter the reference temperature value.

- return to the measuring mode by pressing the 

 button.

Pic. 27.

The  result  will  be  calculated  with  use  of  the  introduced  reference
temperature.

Note:

pressing  both 

 , 

  buttons  simultaneously  sets  the

temperature to 25 

0

C.

Summary of Contents for CX-401

Page 1: ...WATERPROOF MULTIFUNCTION METER CX 401 USER S MANUAL...

Page 2: ......

Page 3: ...USER S MANUAL WATERPROOF MULTIFUNCTION METER CX 401 Before use please read the instructions carefully...

Page 4: ......

Page 5: ...ensation 30 9 Checking the electrode condition 31 9 1 Readout of the electrode parameters after calibration 32 10 pH measurement 34 11 Notices about the temperature compensation and interpretation of...

Page 6: ...ure measurement 81 25 Atmospheric pressure measurement 83 VI Redox potential and temperature measurement 85 26 Entering the potential offset parameters 87 26 1 Choosing the mode of measurement 87 26 2...

Page 7: ...1 I INTRODUCTION...

Page 8: ...2 User s manual for CX 401 multifunction meter v6 0x...

Page 9: ...it is necessary to choose a proper kind of electrode for solutions which are going to be measured e g sewage liquids with deposits meat cheese etc Therefore if you observe improper operation of the d...

Page 10: ...ption of automatic introduction of temperature influence on the value of pH buffer solutions NIST norm information about the pH electrode condition storing of the date and calibration characteristics...

Page 11: ...ibration data of each measuring function in the data transmission software microUSB output for connecting with PC and charging the rechargeable batteries large LCD backlit display with brightness cont...

Page 12: ...nted to NaCl KCl or TDS Waterproof housing enables work in difficult weather conditions or in humid environment CX 401 is used in food chemical pharmaceutical and power industries in water treatment s...

Page 13: ...ssible Pic 1 Next to the temperature value the symbol for automatic temperature compensation or the symbol for manual compensation is displayed The CAL symbol on the left informs that the meter is in...

Page 14: ...g shortly in this mode confirms the calibration result pressing shortly holds the reading on the display records the reading or starts the measuring series pressing and holding this button enters revi...

Page 15: ...9 Pic 2...

Page 16: ...n parameters of electrodes or cells have been lost After pressing the meter adopts standard characteristics offset 0 pH slope 100 for the pH electrode K constant 1 000 cm 1 for the conductivity cell o...

Page 17: ...m the conductivity cell therefore during the pH and the conductivity measurements both electrode and cell may be immersed in the same solution simultaneously 6 1 Choosing the kind of the temperature c...

Page 18: ...on the display symbol will appear Pic 4 with the buttons choose low resolution high resolution Pic 4 For the pH measurement 0 01 pH resolution 0 001 pH resolution For the conductivity measurement 3 di...

Page 19: ...ear Pic 5 the signalisation is switched on After pressing the button once again the READY symbol disappears and switches the signalisation off Pic 5 After switching the signalisation on each reading s...

Page 20: ...ch the calibration data will be stored Pic 6 Below the electrode number one of the following symbols will be displayed under this number there is no characteristic stored and the factory values are pr...

Page 21: ...st calibration will be displayed in the following format month day and the year will be displayed below Pic 7 On the left side of the display the electrode number is shown Blinking date informs about...

Page 22: ...ectrode is necessary To enter the time validity of the calibration in the measuring mode press the until the timeout Pic 8 symbol displays in the upper row of the display The number of days to the nex...

Page 23: ...n the symbol will appear and below the last set parameter will be displayed Pic 9 With the buttons choose each time the button will be pressed the current measurement readout will be recorded pressing...

Page 24: ...ctivating the HOLD function the button function has to be defined according to the previous subchapter Pressing the button will hold the reading on the display Below the reading the HOLD symbol will b...

Page 25: ...19 II pH MEASUREMENT...

Page 26: ...20 User s manual for CX 401 multifunction meter v6 0x...

Page 27: ...by gentle touching the glass with a tissue paper after work the electrode should be stored in the saturated KCl solution The protecting rings should be put on the junction and upper hole in case of l...

Page 28: ...bration validity expiry date In case of using this option calibration should be performed when the symbol of the electrode in use or is blinking For accurate calibration enter the pH values of the app...

Page 29: ...bration mode irreparably erases the electrode s characteristic stored under the chosen electrode number There is no possibility to perform calibration only in one point without changing the rest of th...

Page 30: ...on displays at the upper row and using the buttons choose symbol at the lower row calibration in buffers press the button At the lower row symbol the first buffer solution displays and at the upper ro...

Page 31: ...100 2 4 000 3 900 4 100 3 7 000 6 800 7 100 4 9 000 8 900 10 200 5 12 000 11 800 14 000 The meter recognises only the pH buffers values detected during calibration The pH values stored in unused calib...

Page 32: ...hoose the option from the lower row d return to the measuring mode pressing the button e connect the combination pH electrode prepared earlier and the temperature probe to the pH and t connectors resp...

Page 33: ...en The meter calculates only the pH buffers values detected during calibration The values entered earlier into the memory do not affect the results After finishing calibration in the first buffer rins...

Page 34: ...the button until the symbol is displayed in the upper row and with the buttons choose the calibration in standards option in the lower row Pic 14 d return to the measuring mode pressing the button e...

Page 35: ...mp 0 C 1 oxalate 2 phthalate 3 phosphate 4 di sodium tetraborate 5 calcium hydroxide 0 1 666 4 000 6 984 9 464 13 423 5 1 668 3 998 6 951 9 395 13 207 10 1 670 3 997 6 923 9 332 13 003 15 1 672 3 998...

Page 36: ...olution value to the meter s memory When the electrode is calibrated it is possible to calibrate two another electrodes choosing the remaining electrode numbers After choosing the electrode number ent...

Page 37: ...converting the reading in pH At 20 0 C each pH unit corresponds to 58 168 mV If the electrode has 0 2 pH offset multiply it by 58 168 mV to obtain the electrode potential value in mV SEM Standard Erro...

Page 38: ...heck press the button until the electrode number shows at the upper part of the display or symbol with the buttons choose the number of the electrode that is to be checked and press the button shortly...

Page 39: ...and escaping it without performing calibration at any point the meter takes into consideration an ideal electrode s characteristics and its actual parameters are unknown In such case in the electrode...

Page 40: ...result In case of measurement with automatic temperature compensation turn the meter on by pressing the button using the button choose the pH measurement function join the temperature probe and the c...

Page 41: ...is used or when the temperature probe was damaged In case of measurement with manual temperature compensation turn the meter on by pressing the button using the button choose the pH measurement functi...

Page 42: ...he temperature change Changes of the pH values with the temperature in the majority of solutions are rather slight however in e g pure water they tend to be significant Comparing values of solutions t...

Page 43: ...t cases results from clogged junction broken electrode or contaminated membrane It happens frequently as a result of irrelevant kind of electrode chosen for the kind of measured solution Storing the e...

Page 44: ...38 User s manual for CX 401 multifunction meter v6 0x...

Page 45: ...39 III CONDUCTIVITY AND SALINITY MEASUREMENT...

Page 46: ...40 User s manual for CX 401 multifunction meter v6 0x...

Page 47: ...onductivity changes along with temperature and salts concentration In order to enable comparison of the results the measured value is counted by the meter to the value which corresponds to measurement...

Page 48: ...measurement are going to be made 13 1 Choosing the unit The result of the measurement is displayed in units of conductivity or salinity Salinity can be counted to NaCl KCl or TDS content The result c...

Page 49: ...43 NaCl result counted to NaCl in g l Pic 21 Pic 21 KCl result counted to KCl in g l Pic 22 Pic 22 TDS result counted to TDS in g l Pic 23 Pic 23...

Page 50: ...ependence 1 of weight concentration C 10 000 ppm 10 ppt Resolution of measurement in of weight concentration is 0 001 or 10 ppm 13 2 Entering the WTDS coefficient In case of measurement of salinity wi...

Page 51: ...display the WATER symbol will be displayed non linear compensation for ultra pure water on the right side of the display the PURE WATER symbol will be displayed non linear compensation for ultra pure...

Page 52: ...emperature coefficient 2 oC In case of higher accuracy requirements it is necessary to determine the kind of measured solution and adjust the value of the coefficient To introduce the coefficient in t...

Page 53: ...ue is 25 0 C To enter the reference temperature in the coductivity measuring mode press the button until the reference temperature value displays Pic 27 The reference temperature symbol will appear wi...

Page 54: ...of measurements in distilled water Maintenance of the cell consists in accurate rinsing the measuring cell with distilled water In case of fat content in the measured liquids it is possible to clean...

Page 55: ...he most reliable In case of the user s calibration it is necessary to apply fresh accurately prepared standard solution accurately thermostatic at 250 C When these conditions are not kept the calibrat...

Page 56: ...the K constant of the cell The meter enables 5 point calibration in standard solutions of freely chosen value In case of 1 point calibration it is advisable to use a standard of value close to the an...

Page 57: ...conductivity measuring mode press the button till the symbol appears in the lower row on the LCD Pic 29 with the button choose the point P1 P5 of which value is to be entered with the buttons enter t...

Page 58: ...ppears on the display Pic 30 with the button choose the calibration point corresponding to the standard solution value the point number P1 P5 and the value entered for this point will apear for a mome...

Page 59: ...ce should be evenly moistened measure the temperature of the standard solution with a laboratory thermometer and adjust it to the set reference temperature press and hold the button until the CAL symb...

Page 60: ...ed Between the upper and the lower line the points are shown in which the cell was calibrated If the K constant value appears below the cell number it informs that it has been entered manually without...

Page 61: ...ductivity measuring mode and the unit section 13 1 if the conductivity cell was not calibrated calibrate it according to the chapter 15 immerse the conductivity cell and the temperature probe in the s...

Page 62: ...in the standard solution and hold the conductivity cell at least 1 cm away from the bottom and walls of the vessel The measuring cell should be filled up with the standard solution and should not inc...

Page 63: ...ng to the chapter 15 check or change the value of the reference temperature and the coefficient immerse the conductivity cell in the standard solution and hold it at least 1 cm away from the bottom an...

Page 64: ...s coefficient and the result of salinity is received in g l e g if the conductivity value is 2 mS cm the salinity is 1g l In practice the dependence between conductivity and salinity is not linear and...

Page 65: ...e drying it to constant weight in temperature 103 1050 C weighting and counting in volume ratio mg dm3 The received weight is lower than total dry mass in water because apart from the dissolved solids...

Page 66: ...olved Solids in g l conductivity of the sample in mS cm Note the TDS value should be counted to volume of sample equal to 1l 2 If the reading is to be displayed in of weight concentration WTDS TDS whe...

Page 67: ...easurements in ultra pure water with conductivity up to 10 S cm proceeded with temperature compensation the measurement accuracy has been improved with use of a special function in the meter which ena...

Page 68: ...water is not ideally clear but we do not know the type of contamination the best solution is to choose compensation for contamination with neutral salts PURE WATER Ultra pure water is a strong solvent...

Page 69: ...KCl 10 1 88 H2SO4 50 1 93 NaCl 10 2 14 HF 1 5 7 20 HNO3 31 1 39 Table 5 contains rough values of coefficient for KCl and NaCl depending on the temperature and concentration of the measured liquid Tab...

Page 70: ...the solution again This value will be different than in TR temperature GTx 6 Determine the coefficient using the following formula GTR GTX GTR TR TX x 100 0 C where TR reference temperature in 0 C Tx...

Page 71: ...65 IV OXYGEN CONCENTRATION MEASUREMENT...

Page 72: ...66 User s manual for CX 401 multifunction meter v6 0x...

Page 73: ...intaining activities of the sensor from the user s side It is worth remembering that during measurement the sensor absorbs oxygen from the environment of the membrane The sensor s manufacturers recomm...

Page 74: ...ssembled Depending on thickness of the membrane awaiting time for a stable result is about 1 1 5 min Accuracy of the measurement is connected with the temperature of calibration and measurement The gr...

Page 75: ...e displayed only in To choose the unit in the oxygen measuring mode press the button until the unit symbol displays in the upper row of the LCD with the buttons choose O2 measurement of oxygen concent...

Page 76: ...In order to do it enter the conductivity measuring function by pressing the button measure salinity of the solution in g l unit with conversion to NaCl accurate description in the section 17 1 after s...

Page 77: ...lution with any conductivity meter and read the salinity value from the table in the oxygen measuring mode press and hold the button until the salinity symbol displays in the lower row of the LCD Pic...

Page 78: ...11 6 00 38 23 35 65 40 81 12 6 61 39 23 99 66 41 46 13 7 21 40 24 64 67 42 11 14 7 83 41 25 29 68 42 75 15 8 45 42 25 93 69 43 40 16 9 07 43 26 58 70 44 05 17 9 70 44 27 23 71 44 70 18 10 35 45 27 87...

Page 79: ...ith use of build in atmospheric pressure sensor This influence is automatically counted during measurements in mg l There is a possibility of reading the atmospheric pressure value in the oxygen measu...

Page 80: ...rature of the tested solutions If it is impossible to calibrate the device the membrane of the sensor should be replaced according to the manufacturer s instruction This situation usually takes place...

Page 81: ...rinse it accurately with distilled water and leave it in the air when the reading stabilises press the button The reading will blink what will inform about recording the calibration value at the same...

Page 82: ...of the electrode that is to be checked and press the button shortly The last calibration date will be displayed in the following format month day year below Pic 41A Between the upper and the lower ro...

Page 83: ...ighest accuracy can be achieved by calibrating the sensor at the same temperature at which the measurement will be carried out The measurement error increases together with the difference between the...

Page 84: ...to make measurement with manual temperature compensation disconnect the temperature probe switch the meter on with the button choose the measuring function with the button choose the unit according to...

Page 85: ...ration measurement does not require additional measurements of temperature salinity and atmospheric pressure In order to make measurement connect the oxygen sensor to the O2 connector Pic 2 leave the...

Page 86: ...80 User s manual for CX 401 multifunction meter v6 0x...

Page 87: ...81 V ATMOSPHERIC PRESSURE MEASUREMENT...

Page 88: ...82 User s manual for CX 401 multifunction meter v6 0x...

Page 89: ...value turn the meter on by pressing the button with the button choose the oxygen measuring mode O2 press the button until the pressure symbol dispalys in the lower row of the LCD in the upper row the...

Page 90: ...84 User s manual for CX 401 multifunction meter v6 0x...

Page 91: ...85 VI REDOX POTENTIAL AND TEMPERATURE MEASUREMENT...

Page 92: ...86 User s manual for CX 401 multifunction meter v6 0x...

Page 93: ...e the required mode of measurement in the redox potential measuring mode press the button until the relative symbol will be displayed in the upper row with the buttons choose in the lower row the rela...

Page 94: ...pper row the reference potential symbol will be displayed Pic 45 with the buttons enter the reference potential value or press the button the meter will substitute the value which was measured at the...

Page 95: ...the button connect the temperature probe to the Chinch connector the symbol will be displayed put the temperature probe to the measured solution wait till the value in the lower row stabilises and ch...

Page 96: ...90 User s manual for CX 401 multifunction meter v6 0x...

Page 97: ...91 VII OTHER...

Page 98: ...92 User s manual for CX 401 multifunction meter v6 0x...

Page 99: ...one displays seconds The way of setting time is displayed below 29 2 Date The date is displayed in the Month Day Year system Pic 47 In the upper row current month and day are displayed and in the lowe...

Page 100: ...e time is counted from the last press of any button The value is changed with buttons If after choosing 1 minute the button is pressed instead of numbers the symbol displays The auto off function is d...

Page 101: ...ignalisation off button sound signalisation on READY button and stabilised reading sound signalisation on Rys 49 Return to the time mode by pressing the button 29 6 The LCD backlight mode In the time...

Page 102: ...to 50 makes the work time on one set of batteries two times longer with brightness which is sufficient for work While choosing the backlight mode section 29 6 it is possible to control brightness only...

Page 103: ...The upper row displays the software version number and the lower row shows the kind of internal power source to which the meter is prepared powered by two rechargeable R6 AA batteries powered by two...

Page 104: ...ery measuring function by pressing and holding the button until the number of the most recently recorded readings shows This number is displayed on turns with the stored reading Before recording choos...

Page 105: ...inutes Holding the button increases the change rate repetition In case of setting the parameter to or the position does not appear c the way of displaying the stored readings successively number of th...

Page 106: ...played it informs that the maximal number of readings has been reached 30 3 Collecting measuring series There is a possibility to store series of measurements in the meter s memory It is necessary to...

Page 107: ...highest or lowest number The reviewing mode is left by pressing the button 30 5 Deleting stored readings In order to delete stored readings press and hold the button with the buttons set the number f...

Page 108: ...ission use a special software of our production After inserting the CD to a drive the installation program will start automatically It is necessary to follow the given instructions In the upper wall o...

Page 109: ...he main function In this option choose Factory data downloads the meter s data name serial number calibration date Last calibration downloads only the last calibration in a chosen measuring function H...

Page 110: ...ing the batteries it is signalised by blinking elements in the symbol When this symbol starts lighting continuously it informs that the battery is fully charged During the charging process the meter c...

Page 111: ...pH Efficiency 85 105 Thermal stability of zero 0 001 pH 0 C Range of recognition and entering the pH buffer solutions Calibration point Range 1 0 800 2 100 2 3 900 4 100 3 6 800 7 100 4 8 900 10 200 5...

Page 112: ...0 00 0 C TDS coefficient range 0 20 1 00 Measuring range for conversion to KCl 0 239 g l Measuring range for conversion to NaCl 0 296 g l Measuring accuracy for conversion to TDS 1 0 Measuring accurac...

Page 113: ...ution accuracy 1 digit 50 0 199 9 0 C 0 1 0 C 0 1 0 C accuracy of the meter Final accuracy of the measurement depends on the accuracy of the applied Pt 1000 probe Temperature probe Pt 1000 platinum re...

Page 114: ...5V 1000mA USB power adapter 4 USB A microB cable 5 Data transmission software 6 Manual with warranty Additional equipment 1 Combination pH electrode glass membrane 2 Conductivity cell 3 Oxygen sensor...

Page 115: ...ate power adapter mechanical damage and breakdown caused by servicing or alterations made by unathorised individuals Conductivity cell oxygen sensor and pH electrode are equipped with separate warrant...

Page 116: ......

Page 117: ......

Page 118: ......

Page 119: ......

Page 120: ...Sp j 41 814 Zabrze Grzybowice ul Witosa 10 tel 48 32 2738106 fax 48 32 2738114 www elmetron com pl e mail info elmetron com pl...

Reviews: