precision conductivity meter with temperature probe model 1154
Contents
1. 1 m 1 1 ps m 1 CU 1 ps m 1 picomho m The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 3 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 4 0 SUMMARY OF METHOD A sample of fuel is placed in the conductivity cell which is then connected in series with a DC voltage source and a sensitive DC ammeter The conductivity is calculated by Ohm s law from the cell characteristics the voltage across the cell and the almost instantaneous peak current reading 5 0 APPARATUS 5 1 Components of apparatus A are shown in Fig 1 5 2 The conductivity cell shown in Fig 1 consists of an inner electrode and an outer electrode separated with a teflon insulator The outer electrode and cap also provide a ground path and electrostatic shield 5 3 The measuring apparatus shown in Fig 1 will supply the fuel cell current and convert the output signal directly into ps m units A pushbutton selector allows selection of zero calibrate and 3 range selections 5 4 Electrical connections are completed by a triaxial cable 5 5 The temperature probe is connected to the thermocouple socket and is activa2. PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE MODEL 1154 OPERATION MANUAL EMCEE ELECTRONICS INC 520 Cypress Avenue Venice FL 34285 941 485 1515 FAX 941 488 4648 The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPY RIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE TABLE OF CONTENTS PAGE NO 1 0 SCOPE as we Lin Gee we EA at ee Sen ew ae E E R R Lap Qa 3 2 0 Significance 2 482 3 3 0 Definition ek es ts ete oe aoe eee tf 3 4 0 Summary of Method 4 4 5 0 Apparatus ra anes Gi ANS e a Ae E ARS eh An E 4 Figures 1 amp 2 Model 1154 Conductivity Meter with Fuel Cell and Temperature Probe 5 6 0 Preparation of Sample 6 7 0 Cell Cl aning s s ar bo oe beat KE ge em ae ce eet he ee 6 8 0 Test Procedure o e w ed Gee oe eo Cee eS 8 9 0 Report lt lt e s sos w Soe e Sw ew dea we amp Sf amp 9 10 0 Battery Replacement 9 Service amp Warranty Policy See Emcee Electronics Inc Service and Warranty Manual The information contained in the accompanying document is proprietary and confi
3. ature measurement 8 11 Allow some time for electric charges generated by handling the equipment to flow away if it is expected that the sample has a conductivity below 1 ps m 8 12 If the sample conductivity is known select the corresponding range position When conductivity is unknown first check the fuel on the 2000 ps m range position then read on lower scale if appropriate 8 13 Depress appropriate MEASURE SWITCH and record ps m value correct reading is highest value observed after 3 second delay In AUTO mode reading is stabilized after 3 seconds and held on display for 9 seconds In the MANUAL mode bias voltage is Maintained and the current is continuous as long as the switch is held The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 8 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 8 14 Repeat readings may be taken after 1 minute delay 8 15 Insert the probe in the center receptacle and read the sample temperature by depressing the TEMP switch 9 0 REPORT 9 1 Conductivity of the sample in ps m as the average of the last two determinations 9 2 Temperature at time of co
4. dential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 2 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 1 0 SCOPE This method applies to the laboratory determination of the rest electrical conductivity of aviation fuels and other similarly low conductivity liquids Several instruments are available for various ranges Model Multiplier Range 154 00 0001 X 1 0 2 000 pS m 154 00 0003 X 10 0 20 000 pS m 154 00 0004 xX 100 0 200 000 pS m The instrument will display units between 0 and 1999 The conductivity is equal to the reading times the instrument multiplier and is reported in picosiemens meter pS m The 2 0 SIGNIFICANCE The generation and dissipation of electrical charge in fuel depend largely on the ionic species present which may be characterized by the rest electrical conductivity 3 0 DEFINITION 3 1 Rest conductivity the conductivity of uncharged fuel in the absence of ionic depletion or polarization It is in effect the conductivity at the initial instant of a DC measurement 3 2 Picomho meter unit of electrical conductivity also often called a Conductivity Unit CU In the SI picosiemens replaces picomho 1 ps m 1 x 10 12
5. e is below 1 ps m Note If the conductivity of the n heptane after treatment is higher than 0 03 ps m the treatment should be repeated The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 7 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 8 0 TEST PROCEDURE 8 1 Remove cell and cable from meter 8 2 Set the AUTO MANUAL switch to MANUAL 8 3 Depress the 20 switch digital reading should indicate 0 00 02 ps m after 3 seconds 8 4 Depress the CAL switch digital reading should indicate 1000 3 8 5 If low battery indicator is displayed during measure or calibration the internal batteries should be replaced 8 6 Attach the cleaned cell to the CU meter as shown in Fig 1 8 7 Depress the ZERO switch digital reading should indicate 0 0 02 CU 8 8 Depress the CAL switch digital reading should indicate 1000 5 CU 8 9 Set the AUTO MANUAL switch to AUTO 8 10 Flush the cleaned cell three times with the sample empty the cell completely then fill the outer chamber until sample flows into center receptacle Allow the center receptacle to fill approximately 1 inch for temper
6. id taking the sample for test by pouring from the container pipette instead The sample should be clean and bright when tested Note Bottle samples should be tested immediately Since the glass surface tends to absorb from the fuel the conductive substances that the test is intended to measure 7 0 CELL CLEANING 7 1 The cleaning procedure to be used for the cell depends largely on the nature of the sample to be measured For samples above 20 ps m rinsing with a toluene isopropyl alcohol mixture and air drying is normally sufficient Below 20 ps m one of the following is recommended 7 1 1 If the sample to be measured is a fuel with a similar conductivity to that measured in the previous test the cell need only be rinsed a few times with treated n heptane Ref 7 4 7 1 2 If the sample to be measured differs in conductivity from that measured in the previous test or has a much lower conductivity the cell should be rinsed thoroughly for five times with fresh toluene isopropyl alcohol mixture followed by rinsing with treated n heptane 7 2 After cleaning check the cleanliness of the cell by measuring the conductivity of the treated n heptane This should be lower than 0 03 ps m The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any pu
7. nductivity measurement 10 0 BATTERY REPLACEMENT When batteries become weak a LOW BAT indication is made on the display during test On this occurrence remove the four bottom screws and replace all 6 standard 9 volt cells The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 9 of 9
8. rpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 6 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 7 3 If the conductivity of the treated n heptane is found to be higher than 0 03 ps m repeat the cleaning and checking procedures 7 4 Preparation of n heptane 7 4 1 Prepare by percolating ASTM reference fuel grade n heptane through silica gel as follows 7 4 2 Activate approximately 2000 g of 100 to 200 mesh silica gel by heating at 180 degrees C for 24 hrs Allow it to cool in a desiccator under nitrogen or in vacuum Soak approximately 0 5 g of glass wool for 24 hrs in clean n heptane 7 4 3 Take a tube of borosilicate glass having an inside diameter of 60 to 70 mm a length 1500 mm with a conically shaped lower end provided with a glass cock Place a perforated porcelain disk diameter 25 mm in the lower end of the tube and put the soaked glass wool on top of the disk Fill the tube with the activated silica gel while tapping to achieve homogeneous filling The silica gel layer will be approximately 1250 mm high Wrap the column in black paper to execute light 7 4 4 Percolate n heptane through the column at a rate of about 2 to 3 liter hr Discard the first 3 liters Never allow the column to run dry The silica gel charge is sufficient for the percolation of 1000 liters of n heptane provided the conductivity of the untreated n heptan
9. ted by pressing the Temp button as shown in Fig 2 The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 4 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE Figure 1 TRER aar Figure 2 The information contained in the accompanying document is proprietary and confidential and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics Inc The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics Inc COPYRIGHT 2002 EMCEE ELECTRONICS INC REVISION DATE October 28 2002 Page 5 of 9 PRECISION CONDUCTIVITY METER WITH TEMPERATURE PROBE 6 0 PREPARATION OF SAMPLE 6 1 The sample volume should be at least 0 7L 6 2 Use a clean new epoxy lined can or a new glass bottle that has been rinsed successively with hot water distilled water acetone and toluene isopropyl alcohol mixture then flushed with dry nitrogen Use only non contaminating caps 6 3 Rinse the container several times with portions of the fuel to be sampled If possible fill the container let stand then empty and refill Avo
Download Pdf Manuals
Related Search