User manual - XS Instruments
Contents
1. for five seconds the meter restores to factory 8 pH 50 Version1 0 2012 9 7 default When the meter calibration or display is not normal please restore the meter to factory default then try re calibration 5 Attention 5 1 Frequency of meter calibration depends on the sample electrode performance and required accuracy For high accurate measurement lt 0 02pH please make calibration on time and use the buffer solution of high accuracy For general accuracy measurement lt 0 1pH the meter can be used for one week or even longer once calibrated However the meter must be re calibrated under the following situations a Electrode unused for a long time and new electrode b For measurement of concentrated acid pH lt 2 or concentrated alkaline pH gt 12 solution c For measurement of solution with fluoride and concentrated organic solution d The temperature of tested solution is much different from calibration temperature 5 2 There is some soaking solution in the protection bottle at pH electrode head the electrode head is soaked in the soaking solution to keep the glass bulb and junction activated Take off the cap when measuring and rinse the electrode with pure water After measuring re place the electrode in the protection bottle and put the cap on If the soaking solution becomes turbid or mouldy please clean the bottle and renew the soaking solution 5 3 How to make the electrode soaking solution take 30g pur2. calibration with pH 7 00 buffer solution and pH 10 01 buffer solution If the measuring range is wide or the electrode has been used for long time user should perform three point calibration to get the accurate reading Please note for initial use of pH electrode user should perform three point calibration in order to ensure that the meter slope is the same as pH electrode slope b When the 1 point calibration is done press z to confirm the meter enters into the measurement mode of the 1 point calibration Cal meas to confirm the meter enters into the When the 2 point calibration is done press measurement mode of the 2 point calibration When the 3rd point calibration is done the meter enters into the measurement mode of the 3rd point calibration c If uses pH combination electrode without temperature sensor please place pH electrode and temperature probe need purchase separately in the electrode clip make ATC pH calibration and testing or make manual temperature compensation press 4A or W gt to adjust temperature d When place pH combination electrode in the solution stir a while and place it still which can speed up the response of the electrode Especially when use plastic pH combination electrode stir it more forcefully since there 1s a small cavity between the protection cap of the electrode cap and pH glass bulb which easily causes bubbles and leads to bad contact 6 pH 50 Version1 0 2012 9 7 wit
3. Model pH50 Lab pH Meter Manual 1 Brief Introduction Thanks for purchasing and using Model pH50 Lab pH Meter referred to meter as below Before using this meter please read the manual carefully in order to use and maintain it properly On the basis of improving instrument performance constantly we reserve the right to change the manual and accessories without giving notice in advance This meter is perfect combination of the most advanced electronic sensor technology and software design and is the most cost effective lab pH meter suited for industrial and mining enterprises school and scientific research 1 1 eZ 13 1 4 los 1 6 ed E The meter has the following prominent features There are intelligent functions such as automatic calibration automatic temperature compensation data storage and self diagnose information etc Adopt advanced digital handling technology to improve the response speed of the meter and result accuracy O will appear when reading 1s stable 1 3 points automatic calibration automatically recognize pH buffer solution There are functions of calibration instruction automatic checking and error display Automatically display electrode slope percentage after calibration Large blue backlit display screen Simultaneous display of pH value and temperature value Two options of temperature units C and F Equipped with plastic pH three in one combination el
4. d recall of measured value 3 2 4 A p A v Plus and Minus key 3 pH 50 Version1 0 2012 9 7 For manual temperature compensation press plus or minus key press one time to change 0 1 C each time press continuously to change temperature rapidly 3 2 5 ca Switch key for pH and mV 3 2 6 ENTER Confirmation key 3 3 Socket 3 3 1 pH mV socket when measuring pH connect 201T F plastic pH electrode to the meter when measuring mV connecting ORP electrode or various ion selective electrode to the meter Attention BNC connector After measurement please cover the socket by the short circuit protection cap to maintain the socket clean 3 3 2 Temperature socket Connect the temperature connector of 201T F plastic pH three in one combination electrode or PHT temperature probe to the meter When connecting temperature probe to the meter the meter is under the state of automatic temperature compensation and can test the temperature of solution when removing the temperature probe the meter is under the state of manual temperature compensation and temperature can be adjusted by pressing C or Vs key 3 3 3 REF socket Connect reference electrode when using non combination pH or ion electrode 3 3 4 DC9V power connector Connect DC9V power adapter 4 Using Method 4 1 pH Test 4 1 1 Connect power press SD key to turn on the meter 4 1 2 Take off the short circuit protection cap in
5. e KCL dissolve it in 100mL pure water Avoid dipping the electrode in pure water protein solution and acid fluoride solution for long time and avoid contact with organic lipa 5 4 When calibrate meter with known pH standard buffer solution in order to improve the measuring accuracy pH value of buffer solution should be reliable The buffer solution should be renewed in time after frequently used 5 5 Keep the meter clean and dry especially keep meter and connector clean and dry avoid inaccurate measuring or invalidation If the electrode gets dirty clean it with cotton and alcohol and then dry it 9 pH 50 Version1 0 2012 9 7 5 6 The sensitive glass bulb at the head of the combination electrode should not touch hard objects any damage will invalidate the electrode Before and after measuring rinse the electrode with pure water and shake off the water on the electrode Please do not wipe the glass bulb with tissue paper which leads to unstable electric potential of the electrode and prolong response time After measuring sticky sample please rinse the electrode with pure water repeatedly to remove the sample stuck on the electrode or clean it with suitable dissolvent first and then rinse it with pure water 5 7 When an electrode has been used for long time the electrode will get passivated For example the electrode is not sensitive the response is low or the reading is not accurate The reason is that some measured solution contains
6. ectrode flexible electrode holder and pH buffer solution more convenient to use Technical Specifications pH 000 1400 i 1 pH 50 Version1 0 2012 9 7 Meter 0 01pH 1digit Meter with electrode 0 02pH digit Stability 0 01pH 1 digit 3h 0 100 C automatic or manual 2 2 mV Stability 0 1 FS 1 digit 2 3 Temperature Stability 5 60 C 0 5 C Other range 1 C 2 4 Other technical specifications ore conten Measured value serial number measured value 8 temperature value ATC or MTC na ton ia 1S09001 2008 CE and CMC 3 Introduction to Meter 3 1 LCD display sooo LILES stone BBD arc 2 pH 50 Version1 0 2012 9 7 1 Measured value 2 Measurement unit 3 Temperature compensation icon ATC automatic temperature compensation MTC manual temperature compensation 4 Temperature measured value and measurement unit Calibration icon 6 Storage and recall icon STORE Measured value storage icon RECALL Measured value echo icon 7 Measured value stabilization icon 3 2 Operation keys There are seven operation keys for the meter 3 2 1 AP Switch key 3 2 2 we Key for both calibration and measurement a Under measurement mode press this key to enter into calibration mode b Under other mode press this key to enter into measurement mode lib RE Storage and recall key for storage an
7. electrode 1s damaged 7 pH 50 Version1 0 2012 9 7 4 2 mV value measurement 4 2 1 Press GO key and switch meter to mV measurement mode 4 2 2 Connect ORP electrode or ion electrode need purchase separately and place it in sample solution stir it a while and place still get the reading when the measured value is stable which is ORP value or electric potential of the 10n electrode 4 3 Other Operation Instructions 4 3 1 Storage Recall a Storage oe to store measured value STORE icon and Under measurement mode press storage number 1 2 3 25 are displayed on LCD indicating the measured value is stored under the storage number and return to the normal mode immediately This meter can store 25 measured values and the 1st measured value is replaced with the 2 measured value if the storage exceeds 25 numbers b Recall Press So for two seconds RECALL icon and the last storage number are displayed on LCD then display the measured number then press W and A display alternately the storage number and the measured value c Exit Under the state of RECALL press qq to exit from the storage program then RECALL icon on LCD disappears d Clean away Under the state of RECALL press sh for five seconds to eliminate all storage data 4 3 2 Two options of C and F press Pi or a few seconds to select C or F 4 3 3 Restore to factory default press ENTER
8. h solution Therefore stir enough to ensure to remove bubbles or take off the protection cap of the electrode head and then make testing But be careful not to damage glass bulb e According to the isothermal measuring principle the more close the temperature of sample solution to that of the buffer solution the higher accuracy of measuring can be obtained Please comply with the principle during measurement f During the process of calibration and measurement the meter has self diagnosis functions indicating the relative information as the below Display Content Checking Icons 1 Check whether pH buffer solution is correct 2 Check whether the meter connects the electrode well 3 Check whether the electrode is damaged Electrode zero electric Check whether there are bubbles potential exceeds standard lt 60mV or gt 60mV Electrode slope exceeds standard lt 70 or gt 120 The recognition range of calibration solution exceeds standard in glass bulb Check whether pH buffer solution is correct Replace with new pH electrode Operation when measurement 1s not stable Check whether there are bubbles in glass bulb The measured value 1s not stable Replace with new pH electrode pH measuring range exceeds Check whether the electrode is standard lt 0 00 pH suspended or gt 14 00pH 2 Check whether the meter connects the electrode well 3 Check whether the
9. n detect electrode slope automatically please see the details at the item 4 1 4 and 4 1 5 If the slope is less than 70 please activate the electrode see the details at the item 5 7 or replace with a new electrode 6 Meter Kit 6 1 Model pH50 pH meter 1set 6 2 201T F plastic pH three in one combination electrode 1pc 6 3 pH4 00 7 00 10 01 buffer solution each 50mL 1 bottle 6 4 9V power adapter 1pc 6 5 Model 602 flexible electrode holder 1pc 6 6 Manual 1book 7 Warranty 7 1 Under the normal condition of usage within one year since the purchase date the repair replacement of the parts or the product is free of charge if the instrument fails to work because of manufacturing defects 7 2 pH electrode is not under warranty But if new pH electrode unused does not work the repair or the replacement is free of charge 7 3 This warranty does not apply to the damages which result from improper usage improper maintenance or unauthorized repair by the user 11 pH 50 Version1 0 2012 9 7
10. sert the two connectors of three in one combination electrode into pH and temperature sockets respectively dip the electrode with pure water and shake off water on the electrode 4 1 3 The 1 point calibration 4 pH 50 Version1 0 2012 9 7 Cal Meas a Press to enter into calibration mode CAL and 7 0 appear on the bottom of LCD indicating using pH 7 00 buffer solution to make the 1 point calibration b Place pH electrode in pH7 00 buffer and stir a while and place it still 7 0 appears at the bottom right of LCD indicating that the meter recognizes pH7 00 buffer solution C Wait for a moment until O appears at the top left press ENTER calibration is done when measured value twinkles three times on LCD Display stable pH calibration value on LCD meanwhile CAL 1con 1s twinkling at the bottom of LCD and 4 0 and 10 0 is displayed alternately indicating using pH4 00 or pH10 01 buffer solution to make the 2 point calibration 4 1 4 The 2 point calibration a Take out pH electrode rinse it with pure water and shake off water on the electrode Then place pH electrode in buffer solution pH 4 00 stir a while and place it still Then display stable 4 0 at the bottom right of LCD indicating the meter recognizes pH4 00 buffer solution b Wait for a moment until O appears at the top left press ENTER calibration 1s done when measured value twinkles three times on LCD First display
11. slope percentage then display stable pH calibrated value on LCD meanwhile CAL icon and 10 0 are twinkling at the bottom of LCD indicating using pH10 01 buffer solution to make the 3rd point calibration 4 1 5 The 3 Calibration a Take out pH electrode clean it with pure water and dry it Then place pH electrode in buffer solution pH 10 01 stir a while and place it still Then display stable 10 0 at the bottom right of LCD indicating the meter recognizes pH10 01 buffer solution b Wait for a moment until O appears at the top left press ENTER calibration is done when measured value twinkles three times on LCD First display slope percentage then display stable pH calibrated value on LCD Finally calibration is done and the meter enters into the measurement mode 5 pH 50 Version1 0 2012 9 7 4 1 6 Sample test Place pH electrode in the sample after rinse stir a while and place it still Get the reading value when the measured value is stable 4 1 7 Illustration a This meter can be calibrated automatically by one point two point or three point If the required accuracy is lt 0 1pH user only needs to perform one point calibration with pH 7 00 buffer solution If the measuring range is only within acid range pH lt 7 00 user can perform two point calibration with pH 7 00 buffer solution and pH 4 00 buffer solution If measuring range is only within alkaline range pH gt 7 00 user can perform two point
12. substance contaminating the sensitive glass bulb or causing jam in the junction In this case please take measures accordingly a The glass bulb is contaminated and aged dip the electrode into 0 1mol L diluted hydrochloric acid Preparation dilute 9mL hydrochloric acid with pure water 1000mL for 24 hours Rinse it with pure water then dip it in the soaking solution for 24 hours For serious passivation place the bottom of the electrode in 4 HF hydrofluoric acid for 3 to 5 seconds rinse it with pure water then dip it in the soaking solution for 24 hours to renew its performance b How to clean contaminated glass bulb and junction For reference Contaminant Abluent Inorganic metal oxide Dilute acid lt 1mol L Organic lipa Dilute abluent alkalescence Resinic macromolecule Dilute alcohol acetone ether Protein haematocyte sediment Acidic enzymatic solution such as yeast Pigment Dilute bleacher peroxide The material of electrode housing is polycarbonate Please use with caution the abluent such as tetrachloromethane trichloroethylene tetrahydrofuran and acetone because these abluents can dissolve polycarbonate which leads to the electrode invalidation 5 8 The lifetime of pH electrode is about one year but will be shortened due to bad 10 pH 50 Version1 0 2012 9 7 condition of usage or incorrect maintenance Replace with a new electrode in time when the electrode is aged or invalidated The built in chip of the meter ca
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