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2 Operational Procedures

A

NALYSIS

R

ESULTS

Report Options on page 3 - 20

Press

CHOICE

to display the options. Press

ENTER

to select.

There are several methods for working with analysis results:

n

View

n

Print

n

Transmit

n

E-mail

V

IEW

A

NALYSIS

R

ESULTS

As the analysis is performed, operational status messages are displayed. An example message is
shown below:

A. Number of points collected
B. Number of points requested

C. Current pressure (mmHg)
D. Quantity adsorbed (cm

3

STP)

E. Rate of change for quantity adsorbed

During analysis, the quantity (Q) value equals the quantity adsorbed by the sample in cm

3

STP. At

all other times, the Q value equals the reading of the differential transducer in cm

3

STP. This

reading indicates the amount of gas in the balance side of the system above the amount in the
sample side of the system. This value is usually near zero (0) when an analysis is not in progress.

When the analysis is complete, the analyzer beeps three times. If data have been collected and
surface area or pore volume calculations have been selected, press

CHOICE

to view the results.

2 - 16

Gemini VII Keypad Operator Manual

239-42801-01 (Rev E) — July 2021

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Summary of Contents for GEMINI VII KEYPAD

Page 1: ...OPERATOR MANUAL 239 42801 01 July 2021 Rev E GEMINI VII KEYPAD SURFACE AREA ANALYZER...

Page 2: ...ndows are registered trademarks of Microsoft Corporation Smart VacPrep is a trademark of Micromeritics Instrument Corporation Copyright The software described in this manual is furnished under a licen...

Page 3: ...ons of this warranty will be limited under the following conditions 1 Certain products sold by MICROMERITICS are the products of reputable manufacturers sold under their respective brand names or trad...

Page 4: ...esting of catalysts The company has R D and manufacturing sites in the USA UK and Spain and direct sales and service operations throughout the Americas Europe and Asia Micromeritics systems are the in...

Page 5: ...70 662 3696 www Micromeritics com Instrument Service or Repair Phone 1 770 662 3666 International contact your local distributor or call 1 770 662 3666 Service Helpdesk Micromeritics com Micromeritics...

Page 6: ...all references to the Gemini VII and Gemini VII Confirm environments unless otherwise noted The following symbols or icons indicate safety precautions and or supplemental information and may appear in...

Page 7: ...assist in moving the instrument The Gemini 2390 weighs approximately 32 kg 75 lb n Always pay attention to the safety instructions provided on each label affixed to the instrument and do not alter or...

Page 8: ...he exception of a continuous P0 measurement and a few reports The instrument is intended to be operated by trained personnel familiar with the proper operation of the equipment recommended by the manu...

Page 9: ...limits as described in SJ T11363 2006 x Hazardous substance is above the specified limits as described in SJ T11363 2006 The Environmentally Friendly Use Period EFUP for all enclosed products and the...

Page 10: ......

Page 11: ...i VII 1 9 Keypad Window Keys and Functions 1 12 Keypad Window 1 12 Keys 1 12 Keypad and Keyboard Functions 1 14 2 Operational Procedures 2 1 Define Set Up Groups 2 1 Prepare for Analysis 2 5 Verify Re...

Page 12: ...ds 3 3 Analysis Conditions 3 14 Report Options 3 20 Communications 3 34 System Options 3 38 Analyze Functions 3 44 QuickStart 3 47 Review Functions 3 48 Po Command 3 50 Print 3 51 Transmit 3 52 Manual...

Page 13: ...livery Tubes 5 18 Lubricate the Elevator Drive Assembly 5 18 Power Instrument On and Off 5 18 A Data Format A 1 Report Format Single Column A 1 Report Format Spreadsheet A 5 B Supported Printers B 1 C...

Page 14: ......

Page 15: ...mple safety shield Closes to cover the Dewar Power indicator light Blinks when power is applied to the analyzer illuminates when the analysis program is initiated and ready for operation Balance port...

Page 16: ...e represents the balance tube installed on the left port The filled tube represents the sample tube installed on the right port Elevator Allows placement of the Dewar around the sample and P0 tubes Th...

Page 17: ...oss over ethernet cable can be used since the analyzer will adapt to either type Helium inlet port Attaches the helium gas supply Keypad connection Connects the keypad to the analyzer Power connector...

Page 18: ...ternal devices such as printers bar code readers and keyboards This connector is used to install software upgrades Vacuum pump connector Attaches the vacuum pump hose Rear Panel Components continued 1...

Page 19: ...KEYPAD COMPONENTS A Keypad window B Keys A Contrast adjustment B Keypad cable port Keypad Components Gemini VII Keypad Operator Manual 239 42801 01 Rev E July 2021 1 5...

Page 20: ...temperatures ramp rates and soak times per sample are individually controlled by the analyzer program so that all degas information is integrated into the sample data file for future reference Samples...

Page 21: ...t port for connection to the analyzer A device to reduce oil vapor backstreaming is recom mended The vacuum pump must have an anti suckback valve to prevent oil from being admitted into the analyzer s...

Page 22: ...measurement and nitrogen is used as the adsorbate gas they should be of the following purity or better n Helium purity of 99 9 For analysis of materials with very low surface areas Micromeritics recom...

Page 23: ...max Pollution degree of the intended environment 2 Degree of Ingress Protection IPX0 Environment Adsorbate Optimized for nitrogen in a liquid nitrogen sample bath Gemini may be used with non corrosive...

Page 24: ...y and Linearity transducer manufacturer specification Better than 0 5 full scale Pressure Measurement Standard Tube n Gemini VII 2390a and 2390p 0 95 cm 3 8 in OD 15 5 cm 6 1 in long with 6 5 cm3 of v...

Page 25: ...is required to prevent oil from being admitted into the analyzer should there be a power failure A device to reduce oil vapor backstreaming is also recommended Vacuum System Due to continuous improvem...

Page 26: ...e keys on the keypad are used to execute commands and to enter information at prompts displayed Some keys on the keypad perform a primary and an alternate function n The primary function is indicated...

Page 27: ...Manual Enables manual mode in order to perform certain functions that may be requested by a service representative Alt 2 Set Up Edits copies or transmits Set Up groups Alt 3 Transmit Transmits analys...

Page 28: ...Alt 4 Ctrl A Performs an analysis Diagnostics Alt 7 Ctrl D Performs certain diagnostics Escape Alt Clear Esc n Discards all data entered in the current mode and return to display mode n Cancels an aut...

Page 29: ...munication parameters and sys tem options Transmit Alt 3 Ctrl T Transmits analysis or calibration data over the serial line Transmits a partial report if an auto matic operation is in progress Alterna...

Page 30: ......

Page 31: ...Press ENTER to select A Set Up group can be defined by n Editing an unused Set Up group n Copying the values of a Set Up group and editing them n Resetting a Set Up group to factory defined Set Up gr...

Page 32: ...ID was entered used is displayed n If the Set Up group has not been defined unused is displayed n If the Set Up group is being used and has been reset to a default configuration factory defaults is di...

Page 33: ...nter the Setup number to copy from 4 At Copying settings enter the Setup no to copy to RESET 1 Enter the Setup number or select an existing number 2 Select Resetting Setup to Setup ID 3 When the reset...

Page 34: ...Setup 3 Make the applicable selections as prompted PRINT OR TRANSMIT A Set Up group cannot be printed or transmitted while it is being edited Press Alt 6 to print the Set Up group or Alt 3 to transmi...

Page 35: ...nsure that it is greater than 200 psig Pressures less than 200 psig may cause the sample to be inadequately saturated resulting in inaccurate data or termination of analysis VERIFY VACUUM The vacuum l...

Page 36: ...too much detergent is used it may be difficult to rinse from the sample tubes Ensure the deter gent is dissolved before placing the sample tubes and filler rods into the water 4 Fill the sample tubes...

Page 37: ...and filler rods from the oven and allow to cool Do not insert the filler rods at this time Filler rods are inserted before the sample tube is installed on the analysis port 10 Blow out the sample tub...

Page 38: ...30 m2 in the tube total it may not be necessary to determine the free space difference between the two tubes as a part of the analysis Smaller quantities are required for samples having high surface a...

Page 39: ...le tube set from the Mass of sample tube set plus sample DEGAS THE SAMPLE Sample Data Worksheet for Gas Adsorption on page E 1 After the sample has been weighed use a degassing unit to remove any cont...

Page 40: ...ce area of 1 0 m2 or less use filler rods in the sample and balance tubes See Analyze Samples with a Total Surface Area of 1 0 m2 or Less on page D 1 3 Attach the sample tube to the analysis port Ensu...

Page 41: ...e the Dewar cover under the sample and balance tubes and slide upward until it is 7 5 cm 3 in from connector nuts Sample Tube Installation Gemini VII Keypad Operator Manual 239 42801 01 Rev E July 202...

Page 42: ...For best results if the Dewar has not been used for a while allow approximately 30 minutes for the temperature of the Dewar to stabilize with the bath liquid then recheck the level of the bath liquid...

Page 43: ...nsulated gloves n When pouring liquefied gases from one container to another o cool the receiving container gradually to minimize thermal shock o pour the liquified gas slowly to prevent splashing o v...

Page 44: ...isable any of the prompts before every analysis make the change in System Options To start an analysis using the default analysis parameters 1 At Select Setup enter the Set Up group to use for the cur...

Page 45: ...elected in System Options the previous prompt is not displayed 5 Enter the temperature of the bath liquid from 0 to 999 999 K 6 Enter the evacuation rate from 1 0 to 1000 0 mmHg min Use a lower evacua...

Page 46: ...e of change for quantity adsorbed During analysis the quantity Q value equals the quantity adsorbed by the sample in cm3 STP At all other times the Q value equals the reading of the differential trans...

Page 47: ...f Printer is selected as the report destination in Report Options If not print a report by pressing Alt 6 during or after an analysis TRANSMIT ANALYSIS RESULTS A report can be transmitted through the...

Page 48: ...uring the saturation pres sure in the Po tube but should be plugged if tubes are not installed 2 Add liquid nitrogen LN2 to the Dewar 3 Place the Dewar support on the elevator then place the Dewar on...

Page 49: ...remove the message from the keypad window If an analysis is being canceled and enough data have been collected for calculation results are displayed If there were not enough data collected the followi...

Page 50: ...puter to the instrument s Ethernet port These steps assume an IP address has already been assigned If an address has not been assigned follow the steps in Communications to assign one 1 Open a web bro...

Page 51: ...tifications are not used the name Untitled is assigned and is appended numerically for each file 5 Click the applicable file to view the data results Or click the file for a current operation to monit...

Page 52: ......

Page 53: ...rompting to make an entry The type of entry requested is displayed on the third line The fourth line is used for the entry The following prompt displays when performing an analysis and requests a valu...

Page 54: ...n action The following prompt displays when pressing Alt decimal to measure the saturation pressure Po Press ENTER to start the measurement or Escape Alt CLEAR to cancel and return to the Reload promp...

Page 55: ...ions to report BET multipoint Langmuir BET single point t method report options the area of the adsorbate gas molecule and the density conversion factor to use for calculating total pore volume Commun...

Page 56: ...500 P Po Adsorb pressure 3 0 2000 P Po Adsorb pressure 4 0 2500 P Po Adsorb pressure 5 0 3000 P Po Analysis mode Equilibrate Equilibration time 5 s Scan rate 10 min analysis Analysis Conditions Parame...

Page 57: ...lity 5 0 atm Report Option Parameters continued Field Default ID for Setup 1 factory defaults Request sample ID Yes Request sample mass Yes Request Sat Press During analysis Request Evac Rate Yes Syst...

Page 58: ...0 P Po Adsorb pressure 3 0 3000 P Po Adsorb pressure 4 0 4000 P Po Adsorb pressure 5 0 5000 P Po Analysis mode Equilibrate Equilibration time 2 s Scan rate 10 min analysis Analysis Conditions Paramete...

Page 59: ...0 A Area correction 1 000 Ads pore volume No Report BJH No Report H K No Molecular area 0 162 nm2 Density conversion 0 0015468 Nonideality 5 0 atm Report Option Parameters continued Field Default ID f...

Page 60: ...sorb pressure 3 0 1000 P Po Adsorb pressure 4 0 2000 P Po Adsorb pressure 5 0 3000 P Po Adsorb pressure 6 0 4000 P Po Adsorb pressure 7 0 5000 P Po Analysis mode Equilibrate Equilibration time 2 s Sca...

Page 61: ...ximum thickness 6 500 A Area correction 1 000 Ads pore volume No Report BJH No Report H K No Molecular area 0 162 nm2 Density conversion 0 0015468 Nonideality 5 0 atm Report Options Parameters continu...

Page 62: ...00 P Po Adsorb pressure 4 0 2000 P Po Adsorb pressure 5 0 3000 P Po Adsorb pressure 6 0 4000 P Po Adsorb pressure 7 0 5000 P Po Analysis mode Equilibrate Equilibration time 2 s Scan time 10 min analys...

Page 63: ...ckness 4 200 A Maximum thickness 6 500 A Area correction 1 000 Ads pore volume No Report BJH No Report H K No Molecular area 0 162 nm2 Density conversation 0 0015468 Nonideality 5 0 atm Report Options...

Page 64: ...er at the Select Setup and Use Setup prompts Function Description Edit Setup Edits the selected Set Up group Choices n Edit Setup n Copy another setup n Reset to default n Reset to N300 700 n Reset to...

Page 65: ...detailed in the previous sections When resetting a Set Up group only group specific parameters are reset Setup Type Selects the setup type Choices Analysis Conditions Report Options Communications Sys...

Page 66: ...mple for the sample mass were selected when specifying System Options Enter the mass of the empty sample tube Range 0 0000 to 999 9999 g Evacuation Time Length of time that the sample will be evacuate...

Page 67: ...accuracy without the additional time required for free space measurement This method also includes a balance volume correction and a nonideality correction The free space correction is calculated by d...

Page 68: ...ace Replaces the currently stored pressure table with a new table of evenly spaced points Enter the First rel pressure for data collection Range 0 00001 to 1 0000 P Po Enter the Last rel pressure for...

Page 69: ...er This request is made for each pressure in the table or until 1000 points have been entered An entry of 0 0000 terminates the table An entry of 1 0000 specifies a saturation pressure measurement and...

Page 70: ...olume adsorbed When the rate of adsorption volume adsorbed during the equilibration time divided by total volume adsorbed falls below 0 01 and the variance from 11 consecutive readings falls below 0 1...

Page 71: ...nt rate based on the pressures to be achieved and the length of the analysis Enter the scan time length of time for the analysis Range 1 to 10000 min analysis Analysis Condition Prompts continued Anal...

Page 72: ...s Choices Yes No If Yes is selected select the type of printer Transmit Report Transmits the analysis data automatically after the operation via serial line communication Choices Yes No E mail Report...

Page 73: ...CL 6XL n Epson ESCP2 n Postscript n HP PCL 3 n Canon Bubble Jet Transmission Format Selects the format to be used when transmitting reports Choices Single Column Spreadsheet Area points from Enter the...

Page 74: ...ata points only the first 50 points are used to calculate surface area Individual points after analysis may be selected or deselected Range Area points from value to 1 0000 P Po Report BET multi pt Ch...

Page 75: ...BET 1 pt Choices Yes No Pass Fail If Pass Fail is selected enter the appropriate range Report t method Choices Yes No Pass Fail If Pass Fail is selected specify ranges for external area micropore area...

Page 76: ...or calculating t method micropore volume Range 0 0 to 1 0 P Po Default 0 0 P Po Enter the relative pressure at which to stop selecting collected data points for calculating t method micropore volume R...

Page 77: ...able parameters Parameter Range Default 1 0 0001 to 9999 00 3 540 2 0 0001 to 9999 00 5 000 3 0 01 to 1 00 0 333 Report Options continued 1 Harkins W D and Jura G An Adsorption Method for the Determin...

Page 78: ...s Range Minimum thickness to 99 99 angstroms Default 5 0 A Johnson2 recommends a surface area correction factor of F 0 975 for oxide type catalysts to get the BET area and external surface area to agr...

Page 79: ...the appropriate ranges Des pore volume Calculates the pore volume from the highest point of the desorption isotherm Displays only for the Gemini VII 2390t Choices No Yes Pass Fail If Pass Fail is sele...

Page 80: ...roms Default 3000 0 A Specify if report adsorption is used Choices No Yes Pass Fail If Pass Fail is selected enter the appropriate ranges Specify if report desorption is used Choices No Yes Pass Fail...

Page 81: ...No Yes Pass Fail If Pass Fail is selected specify ranges for volume and width Choices Yes No If Yes is selected at any of the Pass Fail prompts enter the appropriate ranges If Yes is selected enter t...

Page 82: ...used for report calculations Input into this field is slightly different from that of other fields The significand and the exponent can be edited For example the prompt shown above displays 3 49 as th...

Page 83: ...lected for Pore geometry enter the mean zero diameter Range 0 0 to 99 9999 angstroms Default 2 5915 A The mean zero diameter is the gas solid nuclear separation at zero interaction energy where ZS is...

Page 84: ...cal parameters refer to the Calculations document found on the Micromeritics web page www Micromeritics com Cheng Yang corr Choices Yes No If Yes is selected the Cheng Yang correction is applied to th...

Page 85: ...e adsorptive gas Range 0 001 to 1 000 nm2 Density conversion Enter the adsorptive gas to liquid density conversion factor Range 0 0000001 to 1 0000000 Nonideality Nonideality is calculated when a free...

Page 86: ...s to a web browser to view analysis results Results from 5 analyses are stored on the controller and can be viewed in a web browser The IP address is assigned automatically When requesting the DHCP ad...

Page 87: ...IP address Enter the numerical IP address include periods nnn nnn nnn nnn Enter the subnet Mask number using the same format as the IP address The Gateway address is used for communicating outside of...

Page 88: ...outside the local network a gateway address must be specified Enter the e mail address E mail Server Enter the numerical address of the SMTP server the computer that is going to deliver the results Yo...

Page 89: ...s At the Data Bits prompt select either 7 or 8 Stop Bits At the Stop Bits prompt select either 1 or 2 Parity At the Parity prompt select either None Even or Odd Xon Xoff Protocol At the Xon Xoff Proto...

Page 90: ...or example the next prompt displays in Italian if Italiano was selected However any error messages that may be in the message queue remain in English or the current selected language are not translate...

Page 91: ...use this field to identify each analyzer on printed or transmitted reports Date DD MM YY Range Day 1 to 31 Month 1 to 12 Year 00 to 99 Press decimal on the keypad to enter a slash Time MM HH SS Range...

Page 92: ...tering the sample mass or for entering criteria to have it calculated automatically Choices Yes Tube and tube sample No Yes displays a prompt for entering the sample mass Tube and tube sample displays...

Page 93: ...n Entered A prompt is displayed when the analysis is started allowing for entry of a saturation pressure Request Bath Temperature Choices Yes No If No is selected this prompt does not appear when usin...

Page 94: ...s Conditions select Measure as the free space option After the analysis record the reported free space difference and use it for these two tubes only for future calculated runs Enter the difference in...

Page 95: ...eter Width Radius Pressure unit Choices mmHg kPa mbar Pressure symbol Choices P Po p po System Options Functions continued This prompt is specific to a Set Up group System Options Gemini VII Keypad Op...

Page 96: ...up factory defaults Enter the number of the Set Up group to use for the current analysis Choices 0 through 9 Sample ID user entered Displays if Request Sample ID is set to Yes Enter the sample ID Pres...

Page 97: ...use the ENTER button refer to the manufacturer s manual for information on transferring the value Enter the sample mass Range 0 0001 to 999 9999 g Default 1 0000 g Empty tube mass Tube sample mass The...

Page 98: ...ed here If not enter the saturation pressure Range 500 00 to 900 00 mmHg Default Measured value 760 00 mmHg or previous entry Bath temperature Enter the bath temperature Range 0 to 999 999 kelvins Eva...

Page 99: ...ameters for the last Set Up group used will be applied to the QuickStart ana lyses The information displayed on the third and fourth lines of this prompt and subsequent prompts depends on the paramete...

Page 100: ...uring analysis Function Description Sample ID Displays when Request Sample ID is set to Yes The sample ID entered in the Analyze function is displayed Enter a new sample ID if applicable Sample Mass D...

Page 101: ...nction Saturation pressure Displays if Saturation Pressure is set to Previously measured or Entered The last measured saturation pressure entered in the Analyze function is displayed Enter a new satur...

Page 102: ...to install tubes on both ports if Po tube is selected Select the preferred method for measuring the saturation pressure This prompt displays when using the 2390a model Before beginning ensure that em...

Page 103: ...e Reports are also sent to the window regardless of the specified destination Reports are generated after analysis and remain available for viewing or printing until another analysis is performed When...

Page 104: ...ing the standard ASCII data format When captured with an asynchronous serial communications program the report data can be used in spreadsheet and data manipulation programs This window indicates that...

Page 105: ...ectly may cause damage to the instrument or one of its components This template shows the keys used for manual mode functions When performing the manual control functions pertinent information is disp...

Page 106: ...d the balance servo is disabled For this command press Alt 8 Servo valves The 4 5 and 6 keys operate servo valves ON OFF Turns the servo valves on and off An asterisk appears next to the servo valve l...

Page 107: ...ress Alt 1 For the vacuum valve press 1 HELIUM Opens and closes the helium valve NITROGEN Opens and closes the nitrogen valve RESERVOIRS Opens and closes the balance and sample reservoir valve in unis...

Page 108: ......

Page 109: ...tored offsets service request only Some of the diagnostics require operator attention and a beep sounds at that time The beeping continues at intervals until the operator performs the task shown in th...

Page 110: ...ed in the prompts cannot be edited n IP Address n Controller Boot n Last Measured Po n Sample Offset n Sample Slope n Adsorbed Offset n Adsorbed Slope n Balance Offset n Balance Servo n Sample Servo L...

Page 111: ...ure gauge reading A Gas tubing to instrument B Gas regulator shut off valve OPEN C Low pressure gauge 15 18 psig D High pressure gauge E Gas cylinder shut off valve CLOSED F Regulator connecter nut G...

Page 112: ...ENTER At the end of the test a Passed or Failed prompt is displayed n If Failed displays in the window tighten all gas line connections for the adsorptive gas and restart the test n If Passed display...

Page 113: ...Gas regulator shut off valve OPEN C Low pressure gauge 15 18 psig D High pressure gauge E Gas cylinder shut off valve CLOSED F Regulator connecter nut G Regulator control knob OPEN H Brass reducer fit...

Page 114: ...ENTER At the end of the test a Passed or Failed prompt is displayed n If Failed displays in the window tighten all gas line connections for the adsorptive gas and restart the test n If Passed display...

Page 115: ...this test A series of prompts displays each time ENTER is pressed Some prompts may request a task to be performed Always perform the task before pressing ENTER n Informative prompt Indicates how long...

Page 116: ...or Failed is displayed n If Failed displays in the window tighten all gas line connections for the adsorptive gas and restart the test n If Passed displays in the window continue with the next step 4...

Page 117: ...inning this test ensure that the n sample tubes or plugs are installed on the sample and balance ports n helium gas inlet is plugged or if helium is attached the regulator shut off valve is closed n a...

Page 118: ...s test ensure that clean empty sample tubes are installed on the sample and balance ports Verify that clean empty sample tubes of the same size are installed on the sample and balance ports This promp...

Page 119: ...much analysis bath fluid in the Dewar at the start of an analysis n Entry of incorrect system volume for analysis n Impure gas supply When unexpected analysis results occur check the above first Some...

Page 120: ...ium Line tests to determine if a leak exists See Diagnostics on page 4 1 Unable to reach a satisfactory vacuum Cause A Vacuum pump oil level is low or needs to be changed Action A Inspect the oil to s...

Page 121: ...e E Loose internal connection or broken wire Action E Call a Micromeritics Service Representative for repair or replacement inform ation Valves cannot be operated Cause Cable from computer to the inst...

Page 122: ...meter available at most hardware or electronic supply houses or a multimeter There should also be sufficient outlets for the computer monitor printer and any other peripheral devices The analyzer and...

Page 123: ...g and con tinued safety of the equipment after servicing Protective measures for these risks n Electrical The majority of electrical components operate at low voltage 24V or less and pose low risk whe...

Page 124: ...ded period of time to remove ambient gases When possible avoid placing gas cylinders in remote locations It is always best to have gas cylinders located near the analyzer n Use a retaining strap or ot...

Page 125: ...the analyzer to the regulator shut off valve A report is generated at the completion of the test to verify that it has passed or failed Always confirm the state for valves and the low pressure gauge...

Page 126: ...rning the knob counterclockwise Gas will be ven ted from the regulator 4 Turn the regulator control knob clockwise to open and vent any remaining gas Both gauges should read at or near zero If not mak...

Page 127: ...or the large Dewar Always handle glass Dewars with care Any product incorporating a vacuum is a potential safety hazard and should be treated with caution If in doubt contact your safety officer 7 Clo...

Page 128: ...alysis results match those shown within the tolerance level on the bottle the analyzer is ready to use n If the analysis results are not within the tolerance level repeat steps 2 through 10 to analyze...

Page 129: ...eplace as required Vacuum pump exhaust filter Replace as required or every 12 months Tube analysis Blank as required CLEAN THE INSTRUMENT The exterior casing of the instrument may be cleaned using a c...

Page 130: ...n cause pore volume measurement errors in those samples exhibiting high isotherm slope above 0 97 relative pressure Accumulated ice is likely to melt and form a pool of water in the Dewar if all liqui...

Page 131: ...the frit becomes contaminated the contaminant may adsorb or desorb during analysis affecting the results A contaminated frit on the analysis port may be indicated as a leak or a free space reading muc...

Page 132: ...he sample tube connector nut to drop onto the bottom of the tube as it may break the tube Use the proper size frit for the sample port The analyzer will not operate properly if an incorrect size is us...

Page 133: ...O ring is in place insert the sample tube back into the sample port until it is fully seated 6 Slide the sample tube connector nut up the tube until it comes in contact with the port fitting the ferru...

Page 134: ...s to be measured If helium is unavailable contact a Micromeritics service representative for an alternative method of performing this procedure The following procedure is performed using water at ambi...

Page 135: ...lowing parameters Parameter Entry Sample ID user entered Sample mass 1 00 g Saturation pressure 760 mmHg Evacuation rate 1000 mmHg min 9 Press ENTER to begin the analysis 10 Review the analysis result...

Page 136: ...or screw is lubricated before it leaves the factory and should not require lubricating If the elevator starts to vibrate or becomes noisy when traveling contact a Micromeritics Service Representative...

Page 137: ...ORT FORMAT SINGLE COLUMN Record Number Information Conveyed Form 1 Software version number 21 characters 2 Instrument ID 20 characters 3 Set Up group number 1 integer 4 Setup ID 20 characters 5 Sample...

Page 138: ...1 integer 20 Thickness parameter 1 1 floating point 21 Thickness parameter 2 1 floating point 22 Thickness parameter 3 1 floating point 23 Minimum thickness 1 floating point 24 Maximum thickness 1 fl...

Page 139: ...loating point 44 t method micropore volume Pass Fail result 1 integer 45 t method micropore area 1 floating point 46 t method micropore area Pass Fail result 1 integer 47 t method external surface are...

Page 140: ...integer 63 Absolute pressure number of points 1 floating point 64 Quantity adsorbed number of points 1 floating point 65 Saturation pressure if During analysis selected 1 floating point 66 Elapsed tim...

Page 141: ...cuation rate 1 floating point 10 Evacuation time 1 integer 11 Free space method 0 none 1 previous 2 measured 3 calculated 1 integer 12 Free space cm3 STP 760 mmHg 1 floating point 13 Nonideality 1 flo...

Page 142: ...parameter 1 1 floating point 28 Thickness parameter 2 1 floating point 29 Thickness parameter 3 1 floating point 30 Minimum diameter 1 floating point 31 Maximum diameter 1 floating point Horvath Kawaz...

Page 143: ...Fail result 1 integer 53 BJH adsorption total pore volume 1 floating point 54 BJH adsorption total pore volume Pass Fail result 1 integer 55 BJH desorption total pore volume 1 floating point 56 BJH d...

Page 144: ...0 Not selected 1 Selected for surface area 2 Selected for t method 3 Selected for both n Absolute pressure n Quantity adsorbed n Saturation pressure if During Analysis is selected A 8 Gemini VII Keyp...

Page 145: ...must be USB 2 00 or newer n must have a printer language supported by one of the printer drivers listed above n cannot be host based Printers that do not meet these criteria will not interface proper...

Page 146: ......

Page 147: ...zer 3 TXD Transmit data From analyzer 4 DTR Data terminal ready From analyzer 5 GND Ground N A 6 DSR Data set ready To analyzer Pin Assignment The Gemini uses the DTR and DSR signals for hardware flow...

Page 148: ......

Page 149: ...w precise measurement of adsorbed gas This technique can be performed by the following methods n Using glass beads in the balance tube n Using filler rods in the sample and balance tubes Some users fi...

Page 150: ...53 thermal correction no units Note that the volume of one glass bead is approximately 0 014 cm3 Therefore if the measured free space is less than 0 02 cm3 it is unnecessary to correct the free space...

Page 151: ...ube 5 Ensure that the filler rods are equidistant from the top of each tube If they are not add or remove sample until they are the same distance from the top of the tube Packing of some powders may r...

Page 152: ...tube Ensure that the filler rods are equidistant from the top of each tube If they are not add or remove sample until they are the same distance from the top of the tube 3 If using bulbous sample tube...

Page 153: ...as After Degas After Analysis 1 Mass of empty sample tube set g 2 Mass of sample tube set plus sample g g g 3 Mass of sample step 2 minus step 1 g g g Degas Information Degas apparatus Temperature C T...

Page 154: ......

Page 155: ......

Page 156: ......

Page 157: ...tions 1 14 keypad components 1 5 functions 1 12 1 14 INDEX A about this manual iv adsorptive line test 4 3 analysis conditions 3 14 prepare for 2 5 reference 5 9 results 2 16 start 2 14 analyze functi...

Page 158: ...port frit 5 13 sample tube O ring 5 14 U unit configuration 4 2 window 1 12 M maintenance clean and verify the gas line 5 7 clean instrument exterior 5 11 connect gas cylinder 5 8 disconnect gas cylin...

Page 159: ...V vacuum 2 5 W warranty i worksheet sample data E 1 Z zero test 4 10 Index Gemini VII Keypad Operator Manual 239 42801 01 Rev E July 2021 Index 3...

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