Wide-range precision oil conductivity meter/oil conductivity meter Model: DPCM-11DPCM-11 type wide-range oil conductivity meter is used for precision measurement of high cleanliness or serious pollution of various oils in various industries (for example) Conductivity of toluene, transformer oil, aviation fuel, gasoline, kerosene, diesel, engine oil, edible oil, lubricating oil, paints, etc. By measuring the conductivity, you can understand the electrostatic safety of the oil, compare the amount of additives, cleanliness, or the degree of contamination. Following the design and manufacture of YX1154 and YX1154B in the past 2004, it has been improved to DPCM-11 in 2011. The positive and negative polarity are used to measure the conductivity, so as to eliminate oil polarization, oil-electrode contact potential difference and instrument zero. The error caused by the bit. DPCM-11 type oil conductivity meter has a wide measuring range from 0.01pS/m to 199,9nS/m (200,000pS/m) with high precision. Its upper limit is 10 times higher than the US EMCEE 1154 model, and the accuracy is higher. It is 100 times wider than the 1152 type. The technical basis of this instrument - refer to American Standard ASTM D4308-89 "Method for Determination of Conductivity of Aviation Fuel Containing Antistatic Additives", International Standard: ISO6297 "Measurement Method of Oil Conductivity"; According to National Standard: GB6950-2001 "Light Oil Products" Safety static conductivity]; GB/T6539-1997 "Aeronautical fuel and distillate fuel conductivity measurement method"; GB/T-12582-90 "Liquid hydrocarbon conductivity measurement method"; GB13348-1992 "Liquid petroleum product electrostatic safety regulations ", designed as required. The technical support of this instrument——from the old experts of electrostatic instruments that solved the electrostatic measurement technology and static elimination technology of airport oil tankers and oil depots in China in the 1970s and 1990s, and the old experts who mainly drafted the national standards for the above-mentioned oil conductivity measurement method Design and manufacture. I. Technical parameters 1, range and accuracy: Range 20pS/m 200pS/m 2000pS/m 20nS/m 200nS/m Measurement range 0~19.99pS/m 0~199.9pS/m 0~1999pS/m 0~19.99nS /m 0~199.9nS/m Conductivity value accuracy ±(5%+2d) ±(3%+1d) ±(2%+1d) ±(2%+1d) ±(2%+1d) Highest resolution : 0.01pS / m; conductivity cell structure constant and accuracy: 1.00 / m ± 0.5%; calibration electric field: ± 0.5V / mm; pS / m is the conductivity unit, and the United States cu conductivity unit is equal; 1pS / m = 1 pico-Siemens conductivity / m = 1 pico m / m = 1cu 2, reading mode: three and a half (1999) LCD digital display; with self-test 1000 pS / m button; with conductivity starting value automatically Number retention function. It has positive and negative polarity to measure conductivity. 3. Power supply: Built-in 6F22 type 9 volt laminated battery with six sections, intermittent power supply. 4, working environment: temperature: 0 ~ +40 ° C relative humidity: ≤ 85% suitable for use in airports, petrochemical plants or research institutes, refineries, oil depots, gas stations and other oil testing laboratories. 5, structural performance: use on the table, small structure 6, external dimensions: host: 250 × 140 × 210mm electrode: φ57 × 125mm 7, weight: host + electrode a total of 2 kg Second, the working principle: The instrument measures the conductivity of oil liquid The principle is: the conductance of the current through an oil liquid with an area of ​​0.01 square meters and a distance of 0.01 meters under a prescribed electric field force. The basic formula is; K = QG = QU / I = Q / R = (L / A) / R K - - ------ conductivity (pS / m) Q - ------ electrode constant (1/m) G-------- conductance between two electrodes (pS) U-------- voltage applied by the electrode (V) I-------- flow Current through the measured oil (pA) R-------- resistance between two electrodes (TΩ) L-------- effective distance between two electrodes (required = 0.01 m) A-------- Effective area between two electrodes (requirement = 0.01 square meters) III. Preparation of oil sample and instrument inspection: 1. Preparation of oil sample: The sampling process of fuel oil sample should comply with static electricity. Safe operation, for example, the human body should be electrostatically connected to the ground, the pump oil should be stopped for three minutes, and the container should be no less than 1 liter. After three times of cleaning and rinsing, the sample needs more than three sets to measure the most reliable conductance. Rate reading. Some oils must not be in the air for a long time, otherwise the air moisture will cause the conductivity to rise and so on! ! 2. Check if the power supply battery in the instrument is normal: the instrument has been installed in the instrument when it is shipped from the factory. Operate the instrument power switch up and down. After the power is turned on: When the power indicator light is not lit, it indicates that the battery 'Group A' is insufficiently powered; if the range indicator is off, the 'B group' battery power is insufficient; when the 'Measure' button is pressed, 'Measurement If the indicator 'not lit', the 'C group' battery power is insufficient. This instrument uses the common 9V laminated battery in the market, the model is 6F22 type, the total number is six. Use a Phillips screwdriver to open the base of the conductivity meter and replace the nut of the battery holder to replace it. These batteries are available for approximately 100 hours of continuous operation. 3. Check the host (check before the host is connected to the battery cable): 1), the host zero adjustment: After the power supply of the instrument is checked, select the 'timing' switch as 'continuous' and select the 'range' switch. '20pS/m range', then turn the power switch on. When the power is turned on for one minute to stabilize, adjust the 'zero' knob to adjust the digital zero so that the digital display reading should be '0.00pS/m'. 2), the host self-test: After the above zero adjustment of the instrument, when the two buttons 'check' and 'measure' are pressed, the instrument display should be between '980~1020' and it is normal work. If the reading is below '980', the battery power is often insufficient. You can open the instrument and replace the battery with a new one. If the deviation of the reading is more than 1000±20 in the case of a new battery (the system error of the instrument is increased by more than 2%), if the instrument is not seriously wet or the insulation of the input plug socket is seriously polluted, it should be sent. Go to the instrument manufacturing department for repair and recalibrate the instrument. 4. Accessing the conductivity cell: When the instrument is not connected to the power supply, connect the conductivity cell to the input socket of the instrument main unit through a dedicated cable. Before the conductivity cell has not been poured into the fuel, cover the conductivity cell cover, and then the instrument. Turn on the power, press the '20pS/m range' and 'measure' buttons, and then check the instrument zero position. At this time, the zero reading of the instrument should also be kept at 0.00±0.01. Note: The sensitivity of the 20pS/m range of this instrument is very high, and the user often feels unstable. This is because the cable is slightly shaken, the temperature difference between the oil sample and the conductivity cell or the shaking of the conductivity cell will also cause static electricity. stable. If the zero deviation is not much, you can re-zero. If the zero position is unstable or deviates too much, the plastic king or cable plug and socket of the conductivity cell is contaminated. It can be cleaned with analytically pure isopropanol or alcohol, then warmed and blown dry. If necessary, open the conductivity cell base to clean all structural components. 4. Measurement operation: After the above inspection of the instrument is completed, it indicates that the instrument works well, and then the conductivity of the oil is measured: 1. Turn the instrument 'power' switch up and turn on the power; 2. Turn the 'timing' switch Dial down, select to work continuously; 3, turn the 'polar' switch up, select '+' polarity; 4, slowly inject the measured oil into the ring gap between the inner and outer electrodes of the conductivity cell, fill it to overflow The remaining oil cup of the inner electrode. After the end, cover the end of the conductivity cell; 5, select the range as needed (use 2000pS/m range if you don't know the approximate conductivity of the measured oil), then press the 'Measure' button of the instrument, this The instrument can display the conductivity reading of the oil being tested. If the instrument reading shows an overflow of '1***', it means that the conductivity is high and a higher range is required. When the reading is less than two digits, the range can be increased to 200pS/m→20pS/m. If the reading of the instrument is less than 00.02 pS/m, the measured oil conductivity is very low (it is generally impossible to have such a low-purity high-purity oil, only very high-purity xylene, toluene, etc. can reach such a low Conductivity), it is very likely that the instrument's input cable, conductivity cell or instrument input is not electrically connected. 5, the measurement of oil conductivity, often requires reading the starting value, at this time, before the 'measurement' button presses the timing switch to select 'timing', after the 'measurement' switch is pressed, the meter keeps starting A three second reading is taken to read the initial conductivity of the oil. If it is necessary to eliminate the effects of polarization and zero drift, reverse the measurement of the 'polarity' switch and take the average of the absolute values ​​of the two readings. 6. End: After the instrument is used, turn off the power switch. The conductivity cell is cleaned with isopropyl alcohol or alcohol several times, and dried at 120 °C and stored in a dry box. V. Cautions 1. The fuel oil measurement operation should comply with the safety regulations—the human body, the instrument, etc. should be grounded electrostatically (for earth resistance below 100 MΩ), and the oil sample measurement is allowed to take only two minutes after the pump oil operation is stopped. 2. It is not allowed to open the instrument at the dangerous site. 3, the input impedance of the instrument is extremely high, the insulation material of the input plug socket and the preamplifier is most afraid of sweat contamination! Therefore, please do not touch the insulation of these parts. If the weather is wet or long-term use is not affected, then there will often be zero aberrations. At this time, you can use a hair dryer to blow the insulation of the conductivity cell, cable plug and socket with a slight hot air, or even open the host to blow a blow, so that the plastic king is equal. Water marks on the insulation are contaminated by cracks. 4. The instrument should be stored in an instrument box with dry silica gel. When not in use for a long time, please open the back cover of the instrument to remove the battery to prevent the battery from leaking and damaging the instrument. 5. Each adjustment terminal in the instrument is used for error and calibration signal adjustment; please do not adjust it at will! ! 1) DPCM-11 type oil conductivity meter mainframe.........1 2) Conductivity cell..........................................1 3) Cable (0.6 m) ......... ...........................1 to 4) Instruction manual....................................1 5) Instrument inspection certificate..............................1 copy
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