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1. The potentiometer should be kept as clean as possible. Periodically

submerge the unit in solvent to remove cement and other materials.

2. Troubleshooting potential problems:

a. If consistency (voltage) readings fluctuate, examine the resistor and

verify that the top is smooth and consistent. If necessary, re-insert
the resistor and lightly smooth the resistor wire with emery cloth.

b. If the consistency (voltage) reading is zero, the resistor and contact

arm may have lost contact. Adjust the contact arm either up or
down. If this does not correct the problem, the resistor may have
sufficient space between the windings to prohibit conductance. If
this is the case, replace the resistor.

c. If the potentiometer will not hold a calibration, the spring is probably

either damaged or worn by corrosion. Replace the spring.

3. To install a new resistor:

a. Remove the four small screws holding the shaft-bearing retainer to

the potentiometer assembly.

b. Remove the contact arm.

c. Carefully lift the damaged resistor away from the potentiometer.

Clear the resistor groove of any foreign material.

d. Carefully place the new resistor into the groove and ensure that it is

centered between the two terminating contacts.

e. Push the resistor completely into the groove with either a mallet or a

piece of wood. It is very important to ensure that the resistor is
completely inserted into the groove and that the upper surface is
level.

Install a new contact arm and if necessary, bend the arm either up
or down to obtain consistent contact with the resistor.

g. Re-install the shaft-bearing retainer and calibrate the potentiometer

before use.

4. To install a new calibration spring:

a. Remove the contact arm and the shaft-bearing retainer.

b. Carefully lift the calibration spring from the potentiometer assembly.

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

Maintenance

Potentiometer

Содержание HTHP 100

Страница 1: ...20 05 Dual Cell Model 120 40 000 PSI 600 F 120 10 Single Cell 120 15 Dual Cell Instruction Manual Updated 11 15 2011 Ver 2 3 OFI Testing Equipment Inc 11302 Steeplecrest Dr Houston Texas 77065 U S A Tele 832 320 7300 Fax 713 880 9886 www ofite com Copyright OFITE 2011 ...

Страница 2: ...ler 15 Potentiometer Indicator 17 Operation 18 Filling the Slurry Cup 18 Loading the Test Cell 20 Completing the Test 23 Maintenance 24 Cleaning 24 Potentiometer Calibration 26 Potentiometer 28 Troubleshooting 30 Appendix 33 Cell Diagram 33 Slurry Cup Diagram 34 Plumbing Diagram 36 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 1 ...

Страница 3: ...ID temperature controller governs an internal heater which maintains the necessary temperature profile while a magnetic drive mechanism rotates the slurry cup assembly at 150 RPM A potentiometer controls an output voltage which is directly proportional to the amount of torque the cement exerts upon an API approved paddle A chart recorder registers cement consistency and temperature as a function o...

Страница 4: ... 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 3 Size 66 36 32 inches 168 92 82 cm Weight 1 400 lbs 635 6 kg Crated Size 74 44 40 inches 188 112 102 cm Crated Weight 1 600 lbs 726 4 kg Temperature Controller Digital PID 1 Resolution Pressure Indicator 100 PSI 690 kPa Resolution High and Low Pressure Alarms Slurry Cup 150 RPM Rotational Speed 316 Stainless Steel Expansion Chamber Specif...

Страница 5: ...0ML Qty 4 120 10 Model 120 HTHP Consistometer 40 000 PSI 600 F Single Cell 220V 120 001 Mineral Oil 1 Gallon Qty 3 120 101 Release Valve 60 000 PSI Qty 2 120 103 Autoclave Type Rupture Disk 45 000 50 000 PSI Prebulged 120 104 Rupture Disk 17 500 PSI 120 204 Heater Gasket 120 206 2500 Watt Heater 120 521 Slurry Cup with Extension 122 076 1 Amp Fuse 1 Qty 3 122 094 30 Amp Solid State Relay Qty 2 120...

Страница 6: ... 20 mm Qty 5 130 75 28 1 16 Allen Key 1 75 Long Qty 2 120 11 Spare Parts for 120 10 120 001 Mineral Oil 2 Gallons 120 103 Autoclave Type Rupture Disk 45000 50000 PSI Prebulged 1 4 Qty 2 120 202 4000 Watt Heater 120 203 Slurry Cup Thermocouple Qty 2 120 204 Heater Gaskets Qty 2 120 401 Metal O rings Qty 10 120 501 Slurry Cup Sleeve 120 502 Molded Diaphragm Qty 25 120 503 Paddle Pin Qty 12 120 504 P...

Страница 7: ...m Qty 6 120 607 Contact Strip Qty 6 120 608 Grounding Cable Retaining Screw 10 32 1 2 SHCSSS 120 684 Large Bronze Bearing Qty 2 122 072 1 Amp Fuse 5 mm 20 mm Qty 5 122 073 2 Amp Fuse 5 mm 20 mm Qty 5 130 75 28 1 16 Allen Key 1 75 Long Qty 2 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 6 ...

Страница 8: ...www ofite com 7 Timer Pressure Regulator Air To Cylinder Pressure Release Switches Potentiometer Indicator Chart Recorder Pressure Indicator Temperature Controller Water Supply Air Supply Fill Cell Thread Gland Cell Cap Thermocouple Receptacle Thermocouple Port Slurry Test Cell Switch ...

Страница 9: ...also on the back of the unit 5 Make sure all electrical switches are turned off and the unit is ground ed Make the necessary electrical connections in accordance with local codes 6 To fill the oil reservoir open the front cabinet door and remove the oil reservoir cap Using a funnel pour approximately four liters or until full of mineral oil into the reservoir Replace the cap Make sure the seal is ...

Страница 10: ...tory Under normal opera tion one drop of oil should be discharged into the air stream every 12 to 20 pump strokes This discharge can be observed through the clear control needle on top of the lubricator If adjustment is necessary turn the hex screw on top of the control needle until you observe normal dis charge Rotate the screw clockwise to decrease the oil flow rate and counter clockwise to incr...

Страница 11: ...recommended that you carefully study the Eurotherm Chessell 6100V instruction manual before using this equipment To manually archive test data 1 Press the Menu button 2 Press Operator from the menu 3 At the top of the screen press Security and then choose Log In 4 You will then be prompted for a UserID Touch the UserID field and choose Engineer from the list 5 Now touch the Password field At the b...

Страница 12: ... it is possible to restore your configuration from the disk that is shipped with the unit 1 Log in as Engineer as described in steps 1 through 5 above 2 At the top of the screen press Save Restore and choose Restore 3 Make sure all four options are selected then touch the File Name field 4 Press the up arrow to access the root directory 5 Select mediacard and press the down arrow to access the dis...

Страница 13: ...he Eurotherm Review software application 4 From the File menu select Transfer and then click Files 5 Click the Browse button then choose the appropriate drive for your removable media Open the History folder and select the files you wish to transfer 6 Type a name in the Name field and click OK At this point you will receive a warning message Click OK again 7 When the file transfer is complete go t...

Страница 14: ...own the CTRL button to select more than one Click OK 12 The software will now create the chart based on the data collected from the test 13 To jump directly to a specific data point click the Go To button at the top of the screen Choose the data point you wish to view and click OK OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 13 Go To ...

Страница 15: ...isplay shows the current pressure in KPSI This means a reading of 12 501 indicates a pressure of 12 501 PSI To set the high pressure alarm 1 Press the Page button until the display reads AL 2 Press the Enter button until the display reads 1FSH 3 Press the up and down arrows to set the high pressure setpoint OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofit...

Страница 16: ...e the values for that setting For the test described above you will want the following settings ProG List Setting Explanation Seg 1 segment 1 Type rmp r ramp rate other choices include ramp time and dwell Tgt 150 final temperature Rate 2 5 rate per minute Segm 2 segment 2 Type Dwell holds the temperature for the amount of time chosen for Dur below Dur 180 duration time Segm 3 segment 3 Type end En...

Страница 17: ...PERATURE CONTROLLER will display 1FSH If the SONALERT switch is turned on the unit will start to beep If the alarm condition is resolved the heater and pressure pump will automatically be turned back on OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 16 Temperature Controller RUN HOLD Page Scroll ...

Страница 18: ...pecified level an alarm condition is triggered and the heater pump and motor are automatically shut off To change the alarm setting perform the following steps 1 Push the Page key twice The display will read AL 2 Push the Enter key The display will read IFSH 3 Push the up arrow key once to read the current setting 4 Push the up or down arrow keys to change the setting 5 After choosing the appropri...

Страница 19: ...the paddle assembly with the two notches facing upward Tighten the locking ring completely using the provided slurry cup tool 5 Prepare the cement slurry as stated in API Specification 10 6 Pour the cement into the slurry cup through the open bottom of the cylinder 7 Place the metal o ring around the threads of the bottom cap Apply high temperature grease to the o ring and cap surface Screw the ca...

Страница 20: ...not add cement through the hole in the cap 8 Screw the pivot bearing into the hole in the center of the cap and tighten 9 Wipe the entire slurry cup clean to ensure that no cement remains on the outside OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 19 Slurry Cup Tool Slurry Cup Stand Slurry Cup Pivot Bearing Note ...

Страница 21: ...to start the motor briefly to confirm that the slurry cup is properly aligned inside the test cell 2 Lower the potentiometer mechanism into the test cell ensuring that the contact springs of the potentiometer are in alignment with the test cell contacts The slurry cup and potentiometer both have two holes near the top for the lift bail provided Use the lift bail to easily lower the slurry cup and ...

Страница 22: ...o the mark then use a rubber mallet to gently tap the cell cap into posi tion This will ensure that you do not accidentally over tighten If you tighten the cell cap past the marked position you must make a new mark and refer to it for the next test 5 Plug the thermocouple into the port on the side of the unit Insert the thermocouple into the hole in the top of the cell cap and tighten the thread g...

Страница 23: ...on on the timer display The timer displays elapsed time to the nearest tenth of a minute If an alarm condition occurs the timer will stop This is a troubleshooting measure that shows you the point during the test at which the alarm occurred The Timer switch provides power to the timer and the R reset switch resets the timer to zero 12 If the Alarm switch is not already on turn it on now If the Ala...

Страница 24: ... release the pressure very slowly to prevent damage to the equipment 6 Slowly turn the Oil Reservoir Valve to Vent 7 Open the Air To Cylinder valve counter clockwise Air pressure will force the oil back into the reservoir You will hear a hissing sound as air is released When the hissing sound stops close the valve clockwise 8 Carefully unscrew and remove the thermocouple Keep a rag or paper towel ...

Страница 25: ...ected over time 1 Make sure all switches are off and all valves are closed 2 Open the test cell and remove the slurry cup and potentiometer if they are still in place 3 Locate the cover and gland beneath the test cell and remove them 4 Pull the slurry cup table and rotor assembly up through the test cell opening 5 Clean any abrasive particles from the rotor assembly and lay the assembly on a clean...

Страница 26: ...or assembly 8 Insert the rotor assembly into the drive housing Press down on the slurry cup table until it falls into place 9 Replace the cover and gland underneath the test cell before begin ning another test OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 25 Rotor Assembly Rotor Assembly with Slurry Cup Table ...

Страница 27: ...ord hang over the wheel and off the table 5 Attach the hook to the cord 6 Apply the weights to the hook according to the chart below Steady the cord to minimize the amount of swinging When adding weights remember that the hook weighs 50 grams Therefore to test the potentiometer at 200g you only need to add 150g to the hook 7 Firmly tap the surface of the calibration stand with a pen or the blunt e...

Страница 28: ...age values in this chart are only examples Every potentiome ter is different and will therefore produce different voltages The cali bration process will help you interpret the potentiometer readings pro vided by the Consistometer A 400 g weight corresponds to approximately 100 Bc OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 27 Mass grams Approxim...

Страница 29: ...ur small screws holding the shaft bearing retainer to the potentiometer assembly b Remove the contact arm c Carefully lift the damaged resistor away from the potentiometer Clear the resistor groove of any foreign material d Carefully place the new resistor into the groove and ensure that it is centered between the two terminating contacts e Push the resistor completely into the groove with either ...

Страница 30: ...assembly and rotate the spring adjuster until the spring rests at a relaxed state f Ensure that the contact arm aligns with the contact strip and tighten the three set screws g Rotate the center shaft to ensure that the spring does not bind or rub the potentiometer housing h Replace the shaft bearing retainer and calibrate the potentiometer OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 ...

Страница 31: ...block discard the ruptured disk and install a new disk Then re install the block into the plumbing line When a test is complete it should take several minutes to drain the test cell of oil If it takes more than an hour to completely drain the cell the oil filter between the cell and the reservoir may be dirty 1 Locate the oil filter near the top of the unit cabinet in the back There are two hex sh...

Страница 32: ...h the sightglass on the front of the reservoir If the oil is cloudy it should be replaced 1 Make sure all pressure is released from the system and that the cell is open 2 Make sure the Fill Cell valve is set to Vent 3 Remove the reservoir cap 4 On the back of the reservoir inside the cabinet is a drain valve Place a container underneath the drain and open the valve 5 When the reservoir is empty cl...

Страница 33: ...d to each other 2 Check the following based on which controller is causing the alarm Temperature Make sure the thermocouple is plugged securely into the jack on the unit cabinet Pressure Open the panel on the side and locate the shunt The shunt has three positions out middle and in If it is either out or in not middle the controller will report the maximum pres sure causing an alarm Make sure the ...

Страница 34: ...ouston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 33 Sample Thermocouple 120 208 Cooling Jacket Cell Cap Test Cell Heater 120 202 Drive Table 120 147 017 Contact Set 120 00 097 Metal O ring 120 401 Cooling Jacket Test Cell Thermocouple ...

Страница 35: ...510 Paddle Shaft 120 520 Molded Diaphragm 120 502 Paddle 120 506 Gasket 120 513 Pivot Bearing Gasket 120 505 Shear Pin 120 511 Drive Disk 120 509 Expansion Chamber Lid 120 522 Diaphragm Support 120 515 Diaphragm Retaining Ring 120 508 Paddle Pin 120 503 Sleeve 120 501 Base 120 516 Drive Pin 120 512 Pivot Bearing 120 504 120 521 Slurry Cup Assembly With Expansion Chamber ...

Страница 36: ...t 120 507 Molded Diaphragm 120 502 Paddle 120 506 Gasket 120 513 Pivot Bearing Gasket 120 505 Shear Pin 120 511 Drive Disk 120 509 Expansion Chamber Lid 120 522 Diaphragm Support 120 515 Diaphragm Retaining Ring 120 508 Paddle Pin 120 503 Sleeve 120 501 Base 120 516 Drive Pin 120 512 Pivot Bearing 120 504 120 519 Slurry Cup Assembly Without Expansion Chamber ...

Страница 37: ...Appendix Plumbing Diagram OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 36 ...

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