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Summary of Contents for Megger KF-875
- Page 1 Megger KF-875 Moisture Meter User Guide (v0816)
- Page 2 Megger KF-875...
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Page 3: Table Of Contents
3.2 Connecting the Power Supply------------------------------------------- 9 3.3 Setting Up the Glassware------------------------------------------------- 10 3.3.1 Glassware Assembly------------------------------------------- 10 3.3.2 Connecting to the Megger KF-875------------------------- 10 3.3.3 Filling and Changing Reagents------------------------------ 11 3.4 Loading the Printer---------------------------------------------------------- 13 3.5 Connecting a USB Device------------------------------------------------ 14... - Page 4 Megger KF-875 Chapter 11 Conformity and Warranty-------------------------------------------------- 26 11.1 Declaration of Conformity--------------------------------------- 26 11.2 Quality Control----------------------------------------------------- 26 11.3 Customer Support and Service-------------------------------- 26 11.4 Warranty------------------------------------------------------------- 27 11.5 Warranty Exemptions---------------------------------------------27...
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Page 5: Chapter 1 Introduction
Introduction 1.1 Instrument Description The KF-875 model has a small footprint, is easy to use, and supplied complete with a specifically designed low drift cell which is also suitable for outdoor use. The built-in battery and carry case, provide the versatility required by the laboratory and also the ease of use and portability required by the field engineer. -
Page 6: Principle Of Measurement
Karl Fischer titration is simply a means to measure water content of samples. Modern instruments, such as the Megger KF-875, use the Coulometric principle, whereby the water present in the sample is coulometrically titrated to a predefined end point at which there is a minute excess of free iodine present. -
Page 7: Instrument Connections
Megger KF-875 1.3 Instrument Connections Various ports are located on the back plate of the instrument. Below is a list of ports that can be found: (1) Power Supply Port The power supply port is for connecting to an 18V mains power supply, using the supplied power adaptor. -
Page 8: Chapter 2 Safety Information
2.2 Electrical Safety The Megger KF-875 Moisture Meter complies with the international standard IEC 61010. Only operate this instrument within the mains voltage supply that is specified on the back of the instrument, an incorrect mains supply can damage the instrument. -
Page 9: Instrument Setup
3.2 Connecting the Power Supply The Megger KF-875 is powered by an external mains source, with a power pack to ensure this connection is the correct voltage of 18V DC for the instrument. Damage may occur beyond repair and the user may be subjected to electric static shocks if the incorrect power is supplied. -
Page 10: Setting Up The Glassware
Megger KF-875 3.3 Setting Up the Glassware 3.3.1 Glassware Assembly 3.3.2 Connecting to the Megger-KF 875 Moisture Meter (1) Position the titration vessel on the Titrator. (2) Position the electrodes on the titration vessel and tighten by hand. Note: The glass joints do not require PTFE sleeves or grease. -
Page 11: Filling And Changing Reagents
3.3.3 Filling and Changing Reagents Megger KF-875 Titrators have been designed to operate with all major Coulometric Karl Fischer reagents. For most routine applications generator electrodes with frit/diaphragm are used in conjunction with 100ml of anode reagent and 5ml of cathode reagent. We strongly recommend using Aquamax KF A and C Reagents as these have been specially formulated for oil samples. - Page 12 It is advisable to have the cathode reagent 2- 3mm lower than the anode reagent when first charging the titration vessel to speed up preconditioning. The Megger-875 Titrator is now ready to be switched on.
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Page 13: Loading The Printer
Megger KF-875 3.4 Loading the Printer To load the paper into the printer, first open the paper roll holder lid above the print head and remove the old roll and rollers. Now fit rollers to new paper roll, load as shown and insert the paper into the slot at the rear of the print head. -
Page 14: Connecting A Usb Device
Megger KF-875 3.5 Connecting a USB Device To use the memory store, insert Flash Drive into USB port A, the Titrator will see it and a symbol will appear on the display. The symbol will appear blacked out while the drive is being written to and then clear when idle. -
Page 15: Basics Of Operation
Basics of Operation 4.1 Switching ON and OFF The Megger KF-875 Moisture Meter has one I/O switch and is powered by either a mains power supply using an adaptor, or a built-in battery for power. Note: Refer to Chapter 3.2 for power supply connections. -
Page 16: Preconditioning
At the end of the precondition period the display will show: xxxx µg Drift Test After the initial drift has been calculated, in micrograms of water per minute, the Megger KF- 875 is ready for operation. Dft = 0 xxxx µg... -
Page 17: Chapter 5 Running A Test
5.2 Water Standard Test In principle, standardization of a Megger KF-875 is not necessary since the water titrated is a direct function of the coulombs of electricity consumed. However it is recognised that... -
Page 18: Drift Rate Compensation
This ensures that the displayed result is corrected for any ingress of atmospheric moisture during the titration period. Whilst in the Ready condition, the Megger KF-875 continually compensates for any drift caused by atmospheric moisture ingress or reagent decomposition and displays this information, which is updated every 10 seconds. -
Page 19: Overtitration
Megger KF-875 5.5 Overtitration If the detector electrode senses too much Iodine in the titration cell, usually caused by instrument being left unoperated for a long period, the display will read :- “OVERTITRATION - SEE INSTRUCTION MANUAL” OVER TITTRATION – SEE... -
Page 20: Chapter 6 Results
Megger KF-875 Chapter 6 Results 6.1 Printout Explanation The KF875 prints the calculated results in ppm (mg/Kg) along with time and date of the titration and run number. The KF875 automatically increments the next run number every time you press the start button. The run counter is reset to zero when power is switched off and back on again. -
Page 21: Chapter 7 Maintenance
(1) The physical size of the titration cell allows for 50 – 60mL of sample to be added. For the analysis of most liquid samples (e.g. solvents) Megger KF-875 Titrators normally only requires a few micro litres to be injected, therefore the maximum volume of 50 –... - Page 22 THE FASTER THE INSTRUMENT WILL STABILISE READY FOR OPERATION AFTER RECHARGING REAGENTS. Under normal conditions, the Megger KF-875 should be ready for operation within 5 – 10 minutes after reassembly, however it could take considerably longer before to completely stabilise if the drying procedure has not been properly carried out.
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Page 23: Chapter 8 Technical Specifications
Megger KF-875 Chapter 8 Technical Specifications Titration Method: Coulometric Karl Fischer Titration Electrolysis Control: Patented “ACE” Control System GB2370641 End Point Detection: AC Polarisation End Point Indication: Visual Display/Print Out/Acoustic Beep Titration Vessel: Low Drift Cell Design, no grease or PTFE sleeves required Measuring Range: Possible 1µg –... -
Page 24: Chapter 9 Parts List
Megger KF-875 Chapter 9 Parts List Part No: 6111-636 All the following parts are included as standard, but can also be purchased as single items. 18V Power Adaptor In-Car Adaptor Glassware Set LDC Twin Port Comprises of: Titration Vessel LDC... -
Page 25: Chapter 10 Troubleshooting
Megger KF-875 Chapter 10 Troubleshooting Overtitration Detector senses too much Iodine. Usually caused by old reagents or stirrer switched off. Check stirrer speed. Add 3-5 micro litres of water until detector bars activate, and allow to precondition. Excess Drift Indicates excess moisture ingress or condensation on cell walls. Switch OFF. Remove titration cell from clamp and gently swirl anode reagent around the cell walls. - Page 26 BS EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use. EMC requirements. General requirements. 11.2 Quality Control The Megger KF-875 is adequately and professionally Quality Controlled to ensure that it is fully functional and to ensure that it meets all of the requirements that the instrument supports.
- Page 27 3. Ensure the returns label is attached, or that the RA number is clearly marked on the outside of the package and on any correspondence, before sending the instrument, freight paid, to Megger. Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs. In the case of instruments requiring repair outside the warranty period, an immediate quotation can be provided when obtaining the RA number.
- Page 28 Megger KF-875...
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