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Patent No. 6,766,028 - OFI Testing Equipment, Inc.

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com

6

Shear Stress Conversions

To convert from units on left side to units on top, multiply by factor @ intercept.

Dyne/cm

2

Pa

lb/100ft

2

lb/ft

2

DR

Dyne/cm

2

1

0.1

0.2084

0.002084

0.1957

Pa

10

1

2.084

0.02084

1.957

lb/100ft

2

4.788

0.4788

1

0.01

0.939

lb/ft

2

478.8

47.88

100

1

93.9

DR

5.107

0.5107

1.065

0.01065

1

What Bob & Spring Should I Use?

There is often confusion or misunderstanding about what a viscometer can 

actually measure.  For example, a viscometer with an R1B1 F1 combination 

can measure water fairly well at 100 RPM and higher, but at 3 RPM, the 

readings would be shaky at best. While on the other hand, a linear fluid with a 

viscosity of 15000, could not get past 6 RPM with the same combination.

To estimate which spring might be best, use the formula below to calculate a 

Minimum Spring factor, where one establishes the maximum RPM the fluid is 

going to be tested at, as well as what the expected “Apparent Viscosity” of the 

fluid at that RPM.  If the Factor comes out as .87, then an F 1.0 spring should 

be used.  If it comes out as .16, then an F 0.2 spring would be best.  To cover 

all ranges, it may be necessary to use more than one spring.

Always run the TransCal procedure (steps 10 - 14 on page 51) after 

changing the bob or spring.

Minimum Spring Factor (F) =

RPM(max) * AV(max)

BOB(F)*90000

Bob (F)

R1B1

1.0

R1B2

8.9

R1B3

25.4

R1B4

50.7

R1B5

2.4

Содержание 900

Страница 1: ...RCADA Model 900 Software Instruction Manual Updated 1 4 2017 Ver 14 0 Patent No 6 766 028 OFI Testing Equipment Inc OFI Testing Equipment Inc 11302 Steeplecrest Dr Houston Texas 77065 U S A Tele 832 3...

Страница 2: ...dalone 19 With Computer 23 Software 25 Options 25 Save Rate Settings 26 Test Builder 27 Select Analysis Outputs 30 Saved Test Data 31 Calibration History 33 Import Export 34 Onboard Program Manager 35...

Страница 3: ...aft with a biasing spring The viscous drag exerted by the fluid creates a torque on the bob and is monitored by the transducer that measures the angular displacement of the bob Using the angle of disp...

Страница 4: ...7 AC Power Cord 115 Volt 152 38 AC Power Cord 230 Volt Optional 130 76 LSK Low Shear Kit 132 56 S Rotor R1 Slotted 132 58 5 Bob B1 Slotted 134 05 2 Bob Shaft Bearing 134 10 2 Torsion Spring Assembly F...

Страница 5: ...olution 1024 768 pixels Rotor Bob R1B1 R1B2 R1B3 R1B4 R1B5 Rotor Radius RR cm 1 8415 1 8415 1 8415 1 8415 1 8415 Bob Radius RB cm 1 7245 1 2276 0 8622 0 8622 1 5987 Bob Height L cm 3 8 3 8 3 8 1 9 3 8...

Страница 6: ...4 5 12 7 25 1 2 Maximum Viscosity d 0 01 RPM 10 000 000 89 000 000 255 000 000 500 000 000 23 000 000 a Computed for standard Torsion Spring F 1 0 For other torsion 160 92springs multiply by F factor...

Страница 7: ...ter fairly well at 100 RPM and higher but at 3 RPM the readings would be shaky at best While on the other hand a linear fluid with a viscosity of 15000 could not get past 6 RPM with the same combinati...

Страница 8: ...ction of the protective earth terminal is likely to make the instrument dangerous under some fault conditions Intentional interruption is prohibited If the equipment is used in a manner not specified...

Страница 9: ...o not tighten the bob against the stop pin If the bob or spring is being changed run the TransCal procedure steps 10 14 on page 51 Bob Shaft Wrench 130 76 08 Bearing Shield 132 57 2 Some viscometers a...

Страница 10: ...ation With Computer section on page 16 for instructions on calibrating the unit with the ORCADA Software 8 Place a properly prepared sample of test fluid if an R1B1 bob is being used approximately 165...

Страница 11: ...has the FTDI chipset Using a converter without the FTDI chipset could result in poor communication erroneous results or even damage to your machine The computer must be running Windows 2000 or newer F...

Страница 12: ...I specifications These tests ignore the Dead Time and DAQ Time settings on the Options screen Temperature control which is disabled during custom Auto Mode tests is available during a Mud or Cement te...

Страница 13: ...option the time remaining in the conditioning cycle will be 4 minutes However if the test is unpaused using the Override option the time remaining in the conditioning cycle will be five minutes making...

Страница 14: ...the Model 900 Cool This field is not used on the Model 900 Clear This button removes all data from the graph Analysis Model This field below the graph displays the current Analysis Model being used i...

Страница 15: ...button The viscometer will display the Zero Offset This shows how much the bob has drifted since the last calibration If this value is greater than 1 make sure the bob is properly installed on the un...

Страница 16: ...libration internally in a series of sweeps and return to the main screen 8 Turn the unit OFF 9 Loosen the lock nut on the platform while holding the bottom of the platform with your other hand Slowly...

Страница 17: ...he sample will have to be heated or cooled to be within the acceptable range before calibration Do not attempt a calibration if the sample is not within the appropriate temperature range 2 Choose a se...

Страница 18: ...ity Reference the ideal viscosity of the sample as calculated by the software Temp the temperature of the sample at the time viscosity was measured S S Best Fit shear stress value demonstrated by the...

Страница 19: ...so edit an existing batch by selecting it in the Batch Selector list 2 In the Batch field type a name for the batch OFITE recommends using the lot number and viscosity from the Certification Chart tha...

Страница 20: ...quickly and directly changed by pressing the numbered pads No programming or any other entry is necessary 3 CLEAR STOP Used to end a test sequence or to re enter 4 NEXT Used for sequencing functions 5...

Страница 21: ...s to be controlled Either 0 or 1 will be displayed New To change from existing mode 0 Auto Temperature controlled from Viscometer 1 Manual Temperature controlled by Heat Cup Knob Press ENTER and then...

Страница 22: ...SET UP see page 19 to set shear stress units 8 CEM By pressing this button once the viscometer will automatically measure calculate and display shear stress dial readings as per API Recommended pract...

Страница 23: ...Temp 1 10 Sec 2 10 Min 3 Temp 9 In addition to the pre installed programs MUD and CEM the OFITE Model 900 contains 8 slots for custom programs created with the ORCADA Software Refer to page 35 for in...

Страница 24: ...and SS is the two digit number of seconds and select the shear stress units from the drop down menu 3 Enter a temperature in the Temp field and choose Celsius or Fahrenheit 4 Select the Enable checkb...

Страница 25: ...ar stress units from the drop down menu 3 Highlight a test to run from the list in the upper left hand corner of the Main Screen Refer to page 27 for instructions on creating custom tests 4 Enter a na...

Страница 26: ...he pH and Temp pH fields in the process variable area of the Main Screen It will also make pH an option on the key to the graph RPM DAQ Settings RPM High RPM Med and RPM Low Dead Time DAQ Time These f...

Страница 27: ...to monitor 3 In the field after the variable name enter the variance required to initiate a save point For example if you want the software to record a data point when the temperature increases or dec...

Страница 28: ...test select the test from the list in the upper left hand corner of the screen 2 Enter a name in the Test Name field 3 Choose an Analysis Model a RP 39 Power Law Model records the Power Law calculati...

Страница 29: ...d i RPM 1 2 3 etc The RPM fields set the speed of each step of the sweep 5 Repeat step 4 in the following record fields until you have completed building your test 6 Click the OK button to save the te...

Страница 30: ...aph If it is not checked only the currently highlighted record will be plotted The graph below the records provides a visual representation of the current test Each line represents one aspect of the t...

Страница 31: ...e bottom of the Main Screen will show the various data points being calculated by the viscometer based on the chosen Analysis Model This chart however is customizable You can choose which data points...

Страница 32: ...data you are looking for and click the small sign next to it This will show you all of the data for tests run that month including any comments you added 3 Select the test you are looking for and cli...

Страница 33: ...t the test data to a file You will be asked to select a filename and destination and then click OK The resulting file can then be opened in Microsoft Excel for further analysis Print Click this button...

Страница 34: ...he calibration test you are looking for and click the small sign next to it This will show you all of the calibration tests run that month including the fluid batch and any comments you added after th...

Страница 35: ...lable for import To find this folder first navigate to the folder specified in the Data Archive Directory field in the Options screen see page 25 for details From there go to the ORCADA folder and the...

Страница 36: ...en select the desired temperature units F C 4 Enter the required information in the Program Steps box To insert or delete a row click the corresponding Program Actions button a Temperature temperature...

Страница 37: ...he steps from the Program Steps box into the selected onboard program The selected program will be overwritten and the new program will be copied to the Model 900 unit Delete This button deletes the s...

Страница 38: ...process variable This is the actual temperature of the sample f S S shear stress g Gel S S gel shear stress h 300 RPM DR If the Cmd Char is m this will show the 300 RPM dial reading i 600 RPM DR If th...

Страница 39: ...7300 Fax 713 880 9886 www ofite com 38 a Locate the folder for the date of the saved data b Click the small sign next to the folder c Select the data set you wish to view and click OK d The data set w...

Страница 40: ...ic or sulfuric It will damage the equipment The Model 900 utilizes a stepper motor timing chain drive and a non contact rotational transducer detection system which is extremely accurate and sensitive...

Страница 41: ...he bob and rotor 3 Remove the five screws along the base of the outer housing cover and gently lift off the cover Warning Risk of electrical shock 4 Loosen the set screw on the zero calibration knob 5...

Страница 42: ...8 Unscrew the three standoffs 9 Pull the bearing guide up and out of the body 10 On units with a KlikLock bob unscrew and remove the upper magnet assembly Use the supplied bob shaft wrench 130 76 08...

Страница 43: ...the bob shaft is completely out of the bearing guide remove the upper bearing 14 Slide a new bearing onto the shaft to replace the upper bearing The oils from your skin can damage bearings Always wea...

Страница 44: ...the torsion spring 22 Locate the notch on the transducer body Turn the transducer counterclockwise all the way against the stop Adjust the position of the notch on the transducer so that it rests on...

Страница 45: ...forward to loosen the chain freeing it from the sprocket 4 With a small flat head screwdriver remove the split ring from on top of the main shaft bearing Without the split ring the main shaft assembly...

Страница 46: ...ace the split ring on top of the main shaft bearing It is easier to replace the split ring if upward pressure is applied to the main shaft assembly from below 9 Again make sure the belt fits around th...

Страница 47: ...spring can now be removed from the top of the bob shaft 4 Carefully place the new spring into the top of the bob shaft 5 Tighten the three screws on the transducer clamp to secure the torsion spring...

Страница 48: ...mperature and 100 C Then set the temperature offset and slope on the Model 900 This process only applies to firmware version 1 43 and later 1 Press SET UP 2 Press 600 3 times 3 Press NEXT 11 times The...

Страница 49: ...n Enter the Offset value from step 10 and press ENTER If the Offset value is negative include a at the end For example if the Offset is calculated as 2 2 enter 2 2 on the Model 900 12 Press NEXT to go...

Страница 50: ...se and hold it firmly against the stop 4 While holding the bob shaft against the stop turn the transducer until the P value reads approximately 17 000 The P value can be viewed either on the display s...

Страница 51: ...ocess only applies to firmware version 1 43 and later 1 Make sure the computer is connected to the Model 900 viscometer and that the ORCADA software is not open Lower the thermocup and remove the roto...

Страница 52: ...ompt 6 Type M1 and press Enter The characters you type will not appear on the screen 7 Type C and press Enter 8 Ignore the instructions on the screen Slowly turn the bob until it hits one of the stops...

Страница 53: ...upplied by OFITE 12 On the Manage Devices screen right click the Viscometer in the list and select Default Device Then click Done If the Viscometer does not appear in the list select the correct COM p...

Страница 54: ...tware driver CD to the computer and select the file labeled CDM v2 1200 WHQL Certified exe 2 A prompt will open asking if you want to run this file Press Enter or click Run 3 The FTDI CDM Driver will...

Страница 55: ...lling the software Wait for it to finish installing 8 Once the installation is complete navigate to the Device Manager Click the Start Menu Open the Control Panel Click the Hardware and Sound link Cli...

Страница 56: ...ation port COM Port the USB Serial Port is located in The window below is indicating that this sample port was connected to COM3 which can be a different COM depending on the computer and the port it...

Страница 57: ...lled and grounded If an extension cord is necessary make sure it has three prongs and is compatible with the electrical cord provided with the equipment Do not modify the electrical cord provided with...

Страница 58: ...s Improper environment Excessive or inadequate heating or air conditioning or electrical power failures surges or other irregularities Equipment products or material not manufactured by OFITE Firmware...

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