Related Manuals for QUANTACHROME INSTRUMENTS MVP-6DC
Summary of Contents for QUANTACHROME INSTRUMENTS MVP-6DC
- Page 1 MULTIPYCNOMETER Instrument Models: MVP-6DC MVP-D160E OPERATING MANUAL P/N 05034 Rev F © Quantachrome Instruments, 2012-2014...
- Page 2 QUANTACHROME WARRANTY POLICY Quantachrome Instruments warrants its instruments to be free from defects in material and workmanship for a period of one year from date of shipment under normal use and conditions. For the period commencing with the date of shipment and ending one year later, Quantachrome will, at its option either repair or replace any part within an instrument that is found by us to be defective in material or workmanship, without charge to the customer, at our facility or at a customer’s facility if the instrument...
- Page 3 QUANTACHROME INSTRUMENTS’ TERMS AND CONDITIONS OF SALE Terms: Acceptance of this order is conditional on agreement by the Buyer to all terms herein. Buyer’s agreement is assumed unless we are notified to the contrary prior to our invoicing. None of the provisions, terms and conditions contained in this document may be added to, modified, superseded or otherwise changed except by a written instrument signed by the Seller’s authorized...
- Page 4 All claims for loss or damage in transit must be made against the carrier. Warranty: Quantachrome Instruments warrants all instruments that it manufactures for a period of twelve months from the date of delivery. This warranty includes all parts and labor. Quantachrome does not warrant any product against damage from corrosion, contamination, misapplication, improper specification, or wear and tear and operational conditions beyond the Seller’s control.
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Page 5: Table Of Contents
TABLE OF CONTENTS I. INTRODUCTION II. INSTALLATION AND COMPONENTS Location Mains Power Gas Tank Connections Sample Cells and Sample Cell Holder Toggle Valves Needle Valves Selector Valve Pressure Display and Transducer Pressure Relief Valve Calibration Status RS232 Port III. SAMPLE PREPARATION Purging Method Vacuum Method IV. - Page 6 MULTIPYCNOMETER CALIBRATION VALUES LARGE CALIBRATION SPHERE large = 56.5592 cm MICRO CALIBRATION SPHERES (2) 1.0725 cm each micro = 2.145 cm LARGE SAMPLE CELL VOLUME large = __________cm LARGE REFERENCE VOLUME large = __________cm SMALL SAMPLE CELL VOLUME small = __________cm SMALL REFERENCE VOLUME small = __________cm MICRO CELL VOLUME...
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Page 7: Introduction
INTRODUCTION “Pycnometer” is derived from the Greek word pyknos which has long been identified with volume measurements. The MULTIPYCNOMETER is an instrument specifically designed to measure the true volume of a variety of solid materials by employing Archimedes’ principle of fluid displacement and Boyle’s Law of gas expansion. - Page 8 Substituting into equation (3) P ) and P for n and n , respectively, gives – V − − − − − Then − − − Since P is made to read zero on the digital meter, that is, all pressure measurements are relative to P , equation (6) becomes −...
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Page 9: Installation And Components
INSTALLATION AND COMPONENTS Location Place the MULTIPYCNOMETER on a level surface away from sources of heat and cold such as radiators, air conditioning vents, direct sunlight, etc. Mains Power Ensure that the voltage selector at the rear of the unit matches your local mains supply. The MULTIPYCNOMETER is designed for operation on 100V, 120V, 220V or 240V, 50/60 Hz. -
Page 10: Gas Tank Connections
Gas Tank Connections Tools required: 7/16” wrench (not supplied). Attach a dual stage gas regulator to a cylinder of analysis gas, usually ultra-high purity helium or nitrogen. Connect the output of the regulator to the compression fitting on the right side of the cabinet using the 1/8”... -
Page 11: Toggle Valves
Toggle Valves Toggle valves are used to start and stop gas flow in and out of the unit (see Sections III and IV) and to select the appropriate reference volume according to the size of sample cell being used (see Section IV). -
Page 12: Pressure Relief Valve
When not used for prolonged times, the pressure transducer can exhibit some drift during the initial start up operation. To avoid this problem, it is recommended that after switching the unit on, the transducer undergo several pressurization/depressurization cycles prior to making an actual density measurement (or calibration). -
Page 13: Sample Preparation
III. SAMPLE PREPARATION Switch on the power to the unit using the mains on/off switch. Allow at least 15 minutes for the pressure transducer to warm up and stabilize, during which time you can prepare your first sample. Purging Method To purge contaminating vapors and atmospheric gases from the sample (and the system) attach a length of flexible plastic tubing to the hose barb connector on the right side of the MULTIPYCNOMETER and immerse the other end of the tubing into a beaker of water. -
Page 14: Sample Analysis
SAMPLE ANALYSIS Stepwise measurement instructions Ensure that the unit has been switched on for at least 15 minutes for the pressure transducer to warm up and stabilize. Select the appropriate REFERENCE VOLUME for the size of sample cell by using the toggle valves “I”... -
Page 15: Density Worksheet
MULTIPYCNOMETER WORKSHEET TRUE DENSITY REPORT SAMPLE I.D. ____________________________________ DATE ____________________ COMMENTS _____________________________________ OPERATOR _______________ PREPARATION CONDITIONS __________________________________________________ TOTAL WEIGHT (W ) ____________ g REFERENCE VOLUME (V ) ____________cm TARE WEIGHT (W ) _____________ g CELL HOLDERVOLUME (V ) __________cm SAMPLE WEIGHT (W ) ____________ g CALCULATE SAMPLE VOLUME: = Volume of sample (cm... -
Page 16: Calibration
CALIBRATION Page 6 of this manual contains calibration information for reference during calibration and analysis calculations. Print that page and enter the values as indicated on the Calibration Tag or Printout provided with your instrument. This includes the sample cell volumes (V ), the reference volumes ), the volume of the large calibration sphere (V large) and the volume of the micro calibration... - Page 17 Calculate the volume of the large Reference Volume (V large) using equation (9). large large − − − large large large large Where: large = volume of the large calibration sphere P′ large = pressure in V large with no sphere in the cell. P′...
- Page 18 Repeat steps 3-14 and calculate the small cell volume using equation (12). − small small small small (12) Where: ′ small = pressure in V small with no sphere in the cell. ′ small = pressure in V small + V small with no sphere in the cell.
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Page 19: Calibration Spheres
After solving equation (13) for V micro use this value in equation (14) to calculate V micro for the micro sample cell. micro micro micro micro/ micro NOTE: If only the large sample cell is to be used, it is not necessary to recalibrate the small and micro cells. -
Page 20: Sources Of Error
SOURCES OF ERROR Non-ideal gas behavior Equation (8) was derived using the equation of state for an ideal gas; therefore dry helium is recommended for use in the MULTIPYCNOMETER. However, dry nitrogen can also be used at room temperature often with no adverse effect. The use of gases which do not behave in a near ideal fashion at room temperature should be avoided. - Page 21 Figure 1. Gas input connection micro = a small = a + b Pressure transducer 25 psig large = a + b + c pressure relief valve Gas Flow In On/Off Gas Flow In Rate Selector valve Vent Vent Open/Close Vent Rate Sample cell holder...