Model 1154 - Precision Conductivity Meter - Manual 1

The information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002PRECISION CONDUCTIVITY METERMODEL 1154OPERATION MANUALEMCEE ELECTRONICS, INC.520 Cypress AvenueVenice, FL 34285(941) 485-1515FAX 941-488-4648PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 2 of 9TABLE OF CONTENTS PAGE NO. 1.0 Scope . . . . . . . . . . . . . . . . . . . . . . 3 2.0 Significance . . . . . . . . . . . . . . . . . . 3 3.0 Definition . . . . . . . . . . . . . . . . . . . 3 4.0 Summary of Method . . . . . . . . . . . . . . . . 4 5.0 Apparatus . . . . . . . . . . . . . . . . . . . . 4 Figures 1 - Model 1154 Conductivity Meter with Fuel Cell . . . . . . . . . . . 5 6.0 Preparation of Sample . . . . . . . . . . . . . . 6 7.0 Cell Cleaning . . . . . . . . . . . . . . . . . . 6 8.0 Test Procedure . . . . . . . . . . . . . . . . . 8 9.0 Report . . . . . . . . . . . . . . . . . . . . . 910.0 Battery Replacement . . . . . . . . . . . . . . . 9Service & Warranty Policy See Emcee Electronics, Inc Service and Warranty ManualPRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 3 of 91.0 SCOPEThis method applies to the laboratory determination of the "rest"electrical conductivity of aviation fuels and other similarlylow-conductivity liquids. Several instruments are available forvarious ranges. Model Multiplier Range 154-00-0000 X 1 0 – 20,000 pS/m 154-00-0002 X 10 0 – 200,000 pS/mThe instrument will display units between 0 and 19990. Theconductivity is equal to the reading, times the instrumentmultiplier and is reported in picosiemens/meter (pS/m). The2.0 SIGNIFICANCEThe generation and dissipation of electrical charge in fueldepend largely on the ionic species present which may becharacterized by the "rest" electrical conductivity.3.0 DEFINITION3.1 "Rest" conductivity - the conductivity of uncharged fuel inthe absence of ionic depletion or polarization. It is, ineffect, the conductivity at the initial instant of a DCmeasurement.3.2 Picomho/meter - unit of electrical conductivity, alsooften called a Conductivity Unit (CU). In the SI, picosiemensreplaces picomho. 1 ps/m = 1 x 10^-12 +/- ^-1 (m) ^-1 1 ps/m = 1 CU 1 ps/m = 1 picomho/mPRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 4 of 94.0 SUMMARY OF METHODA sample of fuel is placed in the conductivity cell which isthen connected in series with a DC voltage source and asensitive DC ammeter. The conductivity is calculated by Ohm'slaw from the cell characteristics, the voltage across the cell,and the almost instantaneous peak current reading.5.0 APPARATUS5.1 Components of apparatus A are shown in Fig. 1.5.2 The conductivity cell, shown in Fig. 1 consists of an innerelectrode and an outer electrode separated with a tefloninsulator. The outer electrode and cap also provide a groundpath and electrostatic shield.5.3 The measuring apparatus shown in Fig. 1 will supply thefuel cell current and convert the output signal directly intops/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 thermocouplesocket and is activated by pressing the “Temp” button as shown inFig.2.PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 5 of 9 Figure 1PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 6 of 96.0 PREPARATION OF SAMPLE6.1 The sample volume should be at least 0.7L.6.2 Use a clean, new epoxy-lined can, or a new glass bottlethat has been rinsed successively with hot water, distilledwater, acetone, and toluene-isopropyl alcohol mixture thenflushed with dry nitrogen. Use only non-contaminating caps.6.3 Rinse the container several times with portions of thefuel to be sampled. If possible fill the container, let stand,then empty and refill. Avoid taking the sample for test bypouring from the container; pipette instead. The sample shouldbe 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 CLEANING7.1 The cleaning procedure to be used for the cell dependslargely on the nature of the sample to be measured. Forsamples above 20 ps/m rinsing with a toluene-isopropyl alcoholmixture and air drying is normally sufficient. Below 20 ps/mone of the following is recommended:7.1.1 If the sample to be measured is a fuel with a similarconductivity to that measured in the previous test, the cellneed 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 fromthat measured in the previous test, or has a much lowerconductivity, the cell should be rinsed thoroughly for five timeswith fresh toluene-isopropyl alcohol mixture, followed by rinsingwith treated n-heptane.7.2 After cleaning, check the cleanliness of the cell bymeasuring the conductivity of the treated n-heptane. Thisshould be lower than 0.03 ps/m.PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 7 of 97.3 If the conductivity of the treated n-heptane is foundto be higher than 0.03 ps/m, repeat the cleaning and checkingprocedures.7.4 Preparation of n-heptane7.4.1 Prepare by percolating ASTM reference fuel graden-heptane through silica gel as follows:7.4.2 Activate approximately 2000 g of 100 to 200 mesh silicagel by heating at 180 degrees C for 24 hrs. Allow it to cool ina desiccator under nitrogen or in vacuum. Soak approximately0.5 g of glass wool for 24 hrs. in clean n-heptane.7.4.3 Take a tube of borosilicate glass having an insidediameter of 60 to 70 mm, a length 1500 mm, with a conicallyshaped lower end provided with a glass cock. Place a perforatedporcelain disk (diameter 25 mm) in the lower end of the tube andput the soaked glass wool on top of the disk. Fill the tube withthe activated silica gel while tapping to achieve homogeneousfilling. The silica gel layer will be approximately 1250 mmhigh. Wrap the column in black paper to execute light.7.4.4 Percolate n-heptane through the column at a rate of about2 to 3 liter/hr. Discard the first 3 liters. Never allow thecolumn to run dry. The silica gel charge is sufficient for thepercolation of 1000 liters of n-heptane, provided theconductivity of the untreated n-heptane 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.PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 8 of 98.0 TEST PROCEDURE8.1 Remove cell and cable from meter.8.2 Set the AUTO/MANUAL switch to MANUAL.8.3 Depress the 20 switch, digital reading should indicate0.00 +/- .02 ps/m after 3 seconds.8.4 Depress the CAL switch, digital reading should indicate1000 +/- 3.8.5 If low battery indicator is displayed during measure orcalibration, 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 indicate0.0 +/- .02 CU.8.8 Depress the CAL switch, digital reading should indicate1000 +/- 5 CU.8.9 Set the AUTO/MANUAL switch to AUTO.8.10 Flush the cleaned cell three times with the sample, emptythe cell completely, then fill the outer chamber until sampleflows into center receptacle. (Allow the center receptacle tofill approximately 1 inch for temperature measurement.)8.11 Allow some time for electric charges, generated by handlingthe equipment, to flow away, if it is expected that the samplehas a conductivity below 1 ps/m.8.12 If the sample conductivity is known select thecorresponding range position. When conductivity is unknown,first check the fuel on the 2000 ps/m range position thenread 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 ondisplay for 9 seconds. In the MANUAL mode, bias voltage ismaintained and the current is continuous as long as the switchis held.PRECISION CONDUCTIVITY METERThe information contained in the accompanying document is proprietary and confidential, and may not be copied in any mannerwhatsoever without prior written consent of Emcee Electronics, Inc. The document and the material therein may not be used for anypurpose other than that intended by Emcee Electronics, Inc.COPYRIGHT 2002 EMCEE ELECTRONICS, INC.REVISION DATE: October 28, 2002Page 9 of 98.14 Repeat readings may be taken after 1 minute delay.8.15 Insert the probe in the center receptacle and read thesample temperature by depressing the TEMP switch.9.0 REPORT9.1 Conductivity of the sample in ps/m as the average of thelast two determinations.9.2 Temperature at time of conductivity measurement.10.0 BATTERY REPLACEMENTWhen batteries become weak a LOW BAT indication is made on thedisplay during test. On this occurrence remove the four bottomscrews and replace all 6 standard 9 volt cells. Page #1 Page #2 Page #3 Page #4 Page #5 Page #6 Page #7 Page #8 Page #9