Ametek CHANDLER ENGINEERING 7322 User manual

INSTRUCTION MANUAL
MODEL 7322
PRESSURIZED CONSISTOMETER
Revision P –May 2023
P/N 7322-0005
S/N __________
2001 N. Indianwood Ave.,
Broken Arrow, Oklahoma 74012
Tel: [phone] Telefax: 918-459-0165
E-mail: [e-mail]
Website: www.chandlereng.com

Copyright 2023, by Chandler Engineering Company, LLC
P.O. Box 470710 Tulsa, Oklahoma 74147
All rights reserved. Reproduction or use of contents in any manner is prohibited without express permission from Chandler Engineering Company, LLC.
While every precaution has been taken in the preparation of this manual, the publisher assumes no responsibility for errors or omissions. Neither is any
liability assumed for damages resulting from the use of the information contained herein.
This publication contains the following trademarks and/or registered trademarks for: AMETEK and CHANDLER ENGINEERING. These trademarks or
registered trademarks and stylized logos are all owned by AMETEK, Inc. All other company, product and service names and logos are trademarks or
service marks of their respective owners.

TABLE OF CONTENTS T-1
Table of Contents Page
General Information ....................................................................... P-1
Application of the Consistometer........................................................................................................P-1
Description of Apparatus.....................................................................................................................P-1
Safety Requirements............................................................................................................................P-4
Where to Find Help..............................................................................................................................P-4
Section 1 –Installation....................................................................1-1
Unpacking the Instrument....................................................................................................................1-1
Utility Requirements............................................................................................................................1-1
Tools and Equipment Required ...........................................................................................................1-1
Setting up the Instrument.....................................................................................................................1-1
Connecting Air and Water..............................................................................................................1-1
Connecting Power to the Consistometer........................................................................................1-2
Section 2 –Operating Instructions...................................................2-1
Preparing the Instrument for a Test .....................................................................................................2-1
Configuring the Consistency Display ............................................................................................2-1
Programming the Temperature and Pressure Controllers ..............................................................2-1
Hesitation Squeeze.........................................................................................................................2-2
API Slurry Cup Preparation ...........................................................................................................2-2
Running a Test.....................................................................................................................................2-3
After the Test is Complete...................................................................................................................2-4
Draining the Test Cell of Oil..........................................................................................................2-5
Section 3 - Maintenance ..................................................................3-1
Chillers.................................................................................................................................................3-1
After Every Test...................................................................................................................................3-1
Pressure Cylinder ...........................................................................................................................3-1
Potentiometer Mechanism..............................................................................................................3-1
Slurry Cup .................................................................................... 3-Error! Bookmark not defined.
Thermocouple (Slurry Cup) ...........................................................................................................3-1
Thermocouple (Oil)........................................................................................................................3-2
Monthly................................................................................................................................................3-2
Potentiometer Mechanism..............................................................................................................3-2
Resistor Replacement.....................................................................................................................3-2
Calibration Spring Replacement ....................................................................................................3-2
Potentiometer Calibration ..............................................................................................................3-3
Magnetic Drive...............................................................................................................................3-3
Thermocouple and Temperature Control System ..........................................................................3-4
Three Months.......................................................................................................................................3-4
Oil and Filter ..................................................................................................................................3-4
Drive Motor....................................................................................................................................3-4
Six Months...........................................................................................................................................3-5

T-2 TABLE OF CONTENTS
Timer..............................................................................................................................................3-5
Air Operated Valve ........................................................................................................................3-5
Annually...............................................................................................................................................3-5
Pump...............................................................................................................................................3-5
Reservoir ........................................................................................................................................3-5
Heater .............................................................................................................................................3-5
Thermocouple and Temperature Controller...................................................................................3-5
Section 4 –Troubleshooting Guide.................................................4-1
Section 5 - Replacement Parts.........................................................5-1
Section 6 - Drawings and Schematics..............................................6-1

PREFACE P-1
General Information
Application of the Consistometer
Cements have numerous applications in the drilling, completion, work-over, and
abandonment of wells. For each application, the cement is designed with special properties
and is given additives that provide predictable slurry density, volume, viscosity, compressive
strength, and thickening time. Thickening time, or the time a cement slurry remains able to
be pumped into the well, is one of the most critical properties in designing a slurry. A short
thickening time is desired, while maintaining the special properties of the cement's design.
The thickening time of a slurry can be measured in a laboratory by testing a sample of the
slurry in a Pressurized Consistometer. The elapsed time between an initial application of
pressure and temperature on the slurry sample and the development of 100 Bearden units of
consistency (Bc) is the thickening time for the sample at a particular specification test
schedule [Table 8.2, API Spec 10(1)].
Description of Apparatus
The Model 7322 is designed so that closure, heating, and pressurization can be achieved
quickly.
The pressurized consistometer incorporates a rotating, cylindrical slurry cup equipped with a
stationary paddle assembly enclosed in a pressure chamber designed for a working pressure
of 154 MPa (22,000 psi) at a maximum temperature of 205°C (400°F). An air-operated
hydraulic pump generates pressure to the cylinder assembly. The hydraulic system
incorporates a reservoir, piping, valves and filters. Heat is supplied to the chamber by a
2200-watt, internal, tubular heater. Thermocouples are provided for determining the
temperatures of the oil bath and cement slurry.
The programmable temperature controller automatically controls the rate of temperature rise
(i.e. temperature gradient). When the slurry reaches the desired temperature, the controller
will hold the temperature at that level. Hydraulic pressure is generated with an air operated
high-pressure pump. Pressure settings are maintained through the control of a pressure relief
valve and air pressure available to the pump.
The slurry container is rotated at a constant speed of 150 +/- 15 rpm by a magnetic drive.
Drive torque is transmitted from a set of outside drive magnets, through a non-magnetic
housing, to permanent magnets attached to the rotating shaft within the cylinder. Permanent,
rare earth magnets are used to ensure high torque and a long magnetic-field life.
The viscosity (i.e. consistency) of the cement slurry is recorded on a chart as BC (Bearden
Units) obtained from a potentiometer installed within the pressure cylinder. The
potentiometer contains a standardized torsion spring, which resists the rotating force of the
paddle. Rotational force is proportional to consistency of the cement slurry.
REFERENCES
(1) American Petroleum Institute; API Specification for Materials and Testing for Well Cements, Latest Edition; Dallas, TX.

P-2 PREFACE
In the Model 7322, pressure is controlled using a dynamic, programmable pressurization
system. The temperature, pressure and the viscosity of the slurry are recorded on a strip chart
in the electronics module. An interface is also included for PC based data acquisition. The
Chandler Model 5270 Instrument Control System is specifically designed for this interface.
Using the Model 5270 software, hesitation squeeze treatments can also be simulated using
the programmable motor and pressure control capabilities.

PREFACE P-3
Table 1 - Specifications
This unit is in complete compliance with API Spec 10A
Model 7322
Maximum Temperature:
205°C (400°F)
Maximum Pressures:
22,000 psi (150 MPa)
Heater Power:
2200 Watts
Slurry Cup Rotational Speed:
150 rpm
Viscosity Range:
0-100 Bc (Bearden Units)
Pressurizing Medium:
White Mineral Oil
Features Summary
•Programmable Temperature Control
•Rapid Cool Down
•Digital Chart Recorder
•External Chiller Capable
•Dynamic Pressure Control
•Hesitation Squeeze Simulation
•Instrument Control with 5270 System
Mechanical and Electrical
•Input Voltage: 220 VAC ± 15% 50/60 Hz
•Input Power: 3.0 kVA
•Heater Wattage: 2200 Watts
Environment and Utility
•Operating Temperature: 10° to 49°C (50° to 120°F)
•Compressed Air: 75 to 125 psi (517 to 862 kPa)
•Cooling Water: 20 to 80 psi (138 to 552 kPa)

P-4 PREFACE
Safety Requirements
READ BEFORE ATTEMPTING OPERATION OF INSTRUMENT
Any instrument that is capable of the extremely high temperatures and pressures as a
Consistometer should always be operated with CAUTION. The instrument is designed for
operator safety, however to ensure that safety:
•Locate the instrument in a low traffic area.
•Post signs where the instrument is being operated, to warn non-operating personnel.
•Read and understand instructions before attempting instrument operation; observe
caution notes!
•Observe and follow the Warning Labels on the instrument.
•Never exceed the instrument maximum pressure and temperature ratings secured on the
machine.
•Always disconnect main power to the instrument before attempting any repair; HIGH
VOLTAGE CAN KILL!!!
•Keep front access door closed when operating instrument.
•Turn off the heater at completion of each test! Oil in an open cylinder exposed to
atmospheric conditions can result in fire, if heated past its "flash" point.
•A fire extinguisher, Type 8 BC should be located within 50 feet of instrument.
Before attempting to operate the instrument, the operator should study the drawings provided
in the Drawings/Schematics section of this manual to become totally familiar with the
Consistometer operation.
Where to Find Help
On site training classes are available. For more information, contact our Sales Department at
Chandler Engineering (Telephone: [phone], Fax: [phone], e-mail:
[email protected], or visit our website at: www.chandlereng.com.)
In the event of problems, your local sales representative will be able to help or you can
contact the personnel at Chandler Engineering using the following:
Telephone: [phone]
FAX: [phone]
E-mail: [email protected]
Website: www.chandlereng.com

SECTION 1 –INSTALLATION 1-1
Section 1 –Installation
Unpacking the Instrument
After the consistometer is unpacked, the operating equipment and spare parts on the packing
list should be checked to affirm that all have been received and none are damaged.
File an insurance claim with your freight carrier if damage has occurred during shipment.
Utility Requirements
Your unit will require dry, oil-free compressed shop air (not instrument quality) of 75 to 125
psi (517 to 862 kPa), and a water supply of 20 to 80 psi (138 to 552 kPa). The unit is capable
of operating in ambient temperatures from 10°C to 49°C (50°F to 120°F).
Tools and Equipment Required
A standard maintenance or mechanics tool set is adequate for the installation, operation, and
maintenance of the instrument. No special tools are required.
This unit is supplied with an installation kit, which includes the necessary hardware for the
water, air, and electrical hook-ups. The water and air hose may be cut to length and the
appropriate barbed fittings inserted into the hose and clamped into place.
Caution: The laboratory electrical power wiring must be capable of a 30-ampere load
and comply with local electrical codes. The instrument must be securely
connected to an appropriate earth ground. The ground wire must have a larger
diameter than that of the supply voltage conductors.
Setting up the Instrument
Make the appropriate electrical hook-ups between the top and bottom cabinets according to
the rear view of the enclosed Model 7322 Assembly drawing.
The weight of the slurry cup paddle should be recorded prior to using in order to establish the
original weight. Weight the paddle after every 20 tests. Replace paddle when the original
weight has dropped by 20%.
ConnectingAirandWater
Water and air hose hook-ups are located at the lower rear of the instrument. Use the adapters
provided in the accessory kit for each of these connections. All of the fitting threads are
1/4” NPT.
1. Connect the air supply line to the inlet labeled AIR.
2. Connect the water supply line to the inlet labeled WATER IN.
3. Connect the water drain line to the outlet labeled WATER OUT.

1-2 SECTION 1 –INSTALLATION
ConnectingPowertotheConsistometer
1. Connect the supplied twist-on power connector to the receptacle at the rear of the unit.
2. Connect the power plug to an appropriately rated power source and receptacle. For user
safety a power plug and mating receptacle are required.
Note: This receptacle MUST be properly grounded.

SECTION 2 –OPERATING INSTRUCTIONS 2-1
Section 2 –Operating Instructions
The chart recorder is configured at the factory and will be ready for use at power-up. A
manual has been enclosed for your reference.
The Bearden unit indicator is pre-configured at the factory to alarm at 100 Bc. The alarms
control four items. First, an audible alarm is triggered; second, the heater current is cut off;
third, the motor is shut off; and fourth, the timer is stopped.
Preparing the Instrument for a Test
Prior to running a test, the following steps must be performed.
ConfiguringtheConsistencyDisplay
1. Turn on the instrument.
2. Press (Scroll) twice (BC THRESHOLD is displayed).
3. Use or (Up or Down) to change the alarm limit.
A manual has been enclosed for your reference.
Programming theTemperatureandPressureControllers
The programming for the temperature and pressure controllers is identical. The following is
a brief procedure for programming the controllers. For complete instructions, see the Model
9050, 9051, 9060, 9061, 9080 Controller Manual (9050-1050).
Up to 10 Programs can be stored in the device. Press (Page) and then (Scroll); use or (Up
or Down) to select the Program Number. The 5270 DACS software utilizes Program 1 when
a profile is downloaded to the controller for an automated test.
1. Press the Page Key several times until P.Set is displayed. Press Up or Down to
select Program Number 1.
2. Press the Scroll Key several times until S.NUM 1 (Segment Number 1) is displayed.
3. Press the Scroll Key (S.TYPE is displayed). Press the Up or Down keys to
select the segment type.
4. Press the Scroll Key to advance through the Segment Type settings (Target Setpoint
or TimeToTarget). Press the Up or Down keys to change the Segment settings.
5. Press the Page Key at any time to return to the Segment Number prompt.
6. Press the Page Key again to return to the Program Number prompt.
7. Press the Page Key again to return to the Program Setup List.
8. Press the Page Key again to return to the Home Display.
9. From any point press Page and Scroll to return to the Home Display.
10. To manually start or stop a program, press the F1 key to toggle Automatic and Manual
Mode (the Hand icon indicates Manual Mode). Press the F2 key to Run or Reset the
Program.

2-2 SECTION 2 –OPERATING INSTRUCTIONS
HesitationSqueeze
The motor can be programmed to run a hesitation squeeze schedule using the 5270 DACS
software. To allow the motor to run continuously during a test, place the motor switch in the
ON position. To allow the 5270 DACS software to control the motor, place the motor switch
AUTO position. Refer to the 5270 online help files for detailed information on setting up
hesitation squeeze schedules.
API SlurryCupPreparation
For an accurate thickening time test to be performed, it is important for the slurry cup to be
properly maintained and prepared. The following procedure should serve as a guideline for
slurry cup preparations. While assembling the slurry cup, refer to drawing 07-0031 in the
Drawings section of this manual.
1. Thoroughly clean all parts and verify that all parts are in good condition.
2. Lightly grease all interior surfaces of the slurry cup with white lithium grease or the
equivalent.
3. Install the diaphragm support ring, the diaphragm, and the diaphragm backup plate onto
the paddle assembly. The diaphragm should be oriented so that the larger brass piece is
at the top.
4. Slide the shear pin assembly onto the paddle shaft. Place the potentiometer mechanism
on the paddle shaft until it seats. Using an Allen wrench, align the shear pin assembly
into the bottom of the potentiometer mechanism and tighten the set screw to secure it in
place. Remove the potentiometer mechanism from the paddle shaft.
Diaphragm
Back-up Plate
Diaphragm
Support Ring
Diaphragm

SECTION 2 –OPERATING INSTRUCTIONS 2-3
5. Install the complete paddle assembly into the slurry cup.
6. Screw the diaphragm lock-down ring into the top of the slurry cup while checking to
make sure the paddle turns freely.
7. Invert the slurry cup into the slurry cup support.
8. Prepare the cement slurry in accordance with API Spec 10.
Caution: According to API specs: The cement has to be under test (under pressure)
within 5 minutes of mixing.
9. Fill the cup with prepared cement slurry to the bottom of the threads.
10. Remove the plug (pivot) from the center of the bottom cap.
11. Replace the bottom cap without the plug. Slowly screw the cap into place and add
cement through the hole if required.
12. Grease the plug and replace.
13. Rinse the exterior surfaces of the slurry cup.
Running a Test
1. Remove the test cell plug, if it is not already removed from a previous test.
2. Attach the long bail through the holes on the top of the prepared slurry cup and insert it
into the test cell, rotating it until the bottom pins engage the cup drive table. Remove the
bail.
3. After the slurry cup is loaded into the cell, the potentiometer mechanism (pot. mech.) is
pushed onto the slurry cup paddle shaft and the test cell contact pins. Attach the short
bail to the top of the potentiometer and lower the pot mech into the test cell. When
properly engaged, the top of the paddle shaft will be flush with the top of the torque
measurement potentiometer bearing. Remove the bail.
4. Check to be certain that the slurry cup and pot mech are properly engaged. Turn the
Motor switch to ON. No rubbing noise should be heard.
Shear Pin
Assembly

2-4 SECTION 2 –OPERATING INSTRUCTIONS
5. Screw the test cell plug into the cylinder by hand. The last turn of the plug seats the O-
Ring seal and will offer slight resistance.
Note: Do not over-tighten the test cell plug. Hand-tightening the plug is sufficient
for a complete seal.
6. Slide the thermocouple through the test cell plug into the slurry cup paddle shaft. Start
the threads of the sealing gland into the test cell plug, but do not tighten the thermocouple
at this time. Verify that the thermocouple is plugged in at the rear of the instrument.
7. Next, fill the test cell with oil. To accomplish this, close the Pressure Release Valve, and
turn the CYLINDER Control Valve to the FILL position. When oil escapes from the top
thermocouple high-pressure fitting, tighten the sealing gland with a 5/8” wrench.
8. Turn the Pump Switch to the AUTO position to apply the initial pressure to the test cell.
When the pressure reaches the desired level, turn the Pump Switch to the OFF position.
Adjust the pressure as required throughout the test by turning the Pump Switch to FILL
to increase pressure or by slowly cracking open the Pressure Release Valve to relieve
pressure. Use care to open the Pressure Release Valve slowly when attempting to bleed
pressure.
9. To begin the test, the Temperature Controller and Pressure Controller programs must be
started as follows.
10. Press the F1 key to toggle between Automatic and Manual Mode (the Hand indicator
should turn off). Press the F2 button to start the program. The Program Status
indicator should turn on, the Percent Output Power value and Bar Graph should start
increasing and the “1”light should begin flashing indicating the control output to the
heater and/or pump.
11. Turn the Heater and Pump Switch to the ON position, and start the timer. (The heater
and pump will not start until the program start up is initiated through the controller.)
Note: Turn the coolant control switch to ON if an external chiller is used.
After the final temperature is reached for the schedule being run, the controller will continue
on a programmed soak until the schedule is completed.
Note: Once a program has been entered into the controller it may be reused by
pressing the F1 and F2 buttons to run the program again.
After the Test is Complete
A buzzer will sound, signaling the slurry has reached the required consistency. The
controllers must now be shut down as follows:
1. Turn the alarm switch to ‘Off.”
2. Press the Page and Scroll keys on the Consistency display to reset the alarm
condition.
3. Set the heater switch to ‘Off.”

SECTION 2 –OPERATING INSTRUCTIONS 2-5
4. If the program status light is displayed on the temperature or pressure controller screen,
press the F2 button to stop the program. Press the F1 button to toggle to Manual Mode
(the Hand indicator should turn on).
5. Start cooling the cylinder by placing the Coolant Switch to the ON position.
Allow the cylinder to cool to 190º F (90º C) or less before continuing to the next step.
The following steps are necessary in order to transfer the hydraulic oil from the pressure
cylinder back into the reservoir. When cool-down is complete, set the pump switch to ‘Off.’
Warning: When the temperature of the sample is above 212°F, leave at least 500
psig on the sample during cool-down.
Warning: If the cylinder is opened while its temperature is above 100°C (212° F),
steam will escape, and the operator can be injured! Be sure the cylinder
temperature is below 100°C (212°F).
DrainingtheTestCell ofOil
After the cell has cooled and all of the pressure has been relieved, perform the following
steps to drain the oil.
1. Open the T-handled manual pressure release valve to relieve pressure in the cylinder
(slowly opening and closing the valve to release pressure in increments will prevent
rupture of the slurry cup diaphragm).
2. Set the “Cylinder” control rocker switch to the ‘Drain’ position to transfer the oil from
the cylinder into the reservoir. (Completion of the oil transfer will be indicated by a
bubbling or hissing noise in the reservoir.)
3. Set the “Cylinder” control rocker switch to the ‘Off’ position to stop the oil transfer.
4. Loosen the thermocouple seal gland to vent the remaining air pressure from the cylinder.
Warning: If the cylinder is opened while its temperature is above 100ºC (212 ºF), steam
will escape, and the operator can be injured! Be sure the cylinder temperature
is below 100°C (212°F).
5. Remove the thermocouple from the cylinder head.
6. Remove the cylinder head by tapping the cylinder head handles with a rubber mallet to
jar the head loose and then remove the head itself.
7. Using the pot mech bail, reach into the cylinder and remove the pot mech.
8. Using the slurry cup bail, reach into the cylinder and remove the slurry cup. The cup
should be immersed immediately in a container of cold water.
9. Clean the slurry cup thoroughly and coat it with grease. Also, disassemble and clean the
diaphragm hub and apply grease liberally to the hub O-rings.

2-6 SECTION 2 –OPERATING INSTRUCTIONS
This page is intentionally left blank.

SECTION 3 –MAINTENANCE 3-1
Section 3 - Maintenance
The operating life of the consistometer can be extended measurably if operating and
maintenance instructions provided in this manual are adhered to. Avoidance of down time
and parts replacement depends on the proper cleaning, lubrication, replacement of filters, and
calibration of instrumentation and controls. The following procedures will correspond with
the maintenance schedule time intervals included in this manual.
Chillers
Instruments using a chiller sometimes produce condensation when used. The use of a fan or
air-conditioned environment will help in keeping the moisture level lower. Wipe away any
condensation that may occur inside the cabinet.
After Every Test
Pressure Cylinder
1. Inspect and replace the O-ring on the cylinder plug if cuts, damage, or imbedded particles
are present. If none of these conditions are noted, wipe the O-ring and the plug groove
free of cement particles or other foreign matter and lubricate the O-ring with a light film
of grease or oil.
2. The thread of cylinder plug has been lubricated with molybdenum disulfide grease by the
factory. If molybdenum disulfide grease is not immediately available, a mixture of white
lead and lubricating oil will be a satisfactory substitute.
PotentiometerMechanism
The potentiometer mechanism (pot mech) must be cleaned after every test. Using a nylon
brush, lightly brush down the unit with mild dish washing soap. Clean all cement sediment
from the contact springs, resistor, and exterior surfaces. Rinse the assembly thoroughly with
water. Apply a light coat of mineral oil to the resistor surface and bearings to prevent
oxidation.
SlurryCup
All components of the slurry cup must be cleaned and inspected thoroughly after every test to
ensure proper operation of the consistometer.
1. Inspect the plug for any wear such as dishing or rounding out of the inner taper.
Excessive wear of the tapered seat will prevent the proper centering of the paddle shaft
and result in binding the paddle to the interior wall of the slurry cup.
2. Inspect the shaft tip for wear and ensure that the shaft is straight. Excessive wear of the
sharp tip or a bent shaft will prevent the shaft from centering in the cup base plug. Either
of these conditions will result in binding of the paddle to the interior wall of the slurry
cup. Inspect the shaft that is in contact with the diaphragm, replacing when worn.
3. Replace the paddle any time damage such as bent or broken vanes exists. The paddle
weight should be recorded before the first use. Weigh the paddle after every 20 tests.
When the original weight of the paddle has dropped by 20%, replace the paddle.

3-2 SECTION 3 –MAINTENANCE
4. Replace the diaphragm (07-0038 or 07-1006) when the diaphragm is no longer flexible.
Note that these diaphragms are consumable items, use at temperatures above 300°F
reduces the useful life.
Thermocouple(SlurryCup)
Inspect the thermocouple to ensure that it is straight, and the threaded collar is positioned
with two threads showing on the lower side. Inspect the threaded collar and gland nut for
clean and well-formed threading. Worn threading on either part presents a safety hazard to
the operator. If the threads are damaged, the thermocouple may blow out under pressure.
Inspect the exterior of the probe for thinning or nicking. Replace any or all components as
required.
Thermocouple(Oil)
Inspect the thermocouple to ensure that the threaded collar is positioned with two threads
showing on the lower side. Inspect the threaded collar and gland nut for clean and well-
formed threading. Worn threading on either part presents a safety hazard to the operator. If
the threads are damaged, the thermocouple may blow out under pressure. Inspect the exterior
of the probe for thinning or nicking. Replace any or all components as required.
Monthly
PotentiometerMechanism
The potentiometer mechanism must be completely disassembled and cleaned. If any of the
following components exhibit signs of wear, they must be replaced as follows.
ResistorReplacement
1. Remove the shaft bearing retainer and contact arm.
2. Remove the oil resistor, using care not to damage the slot.
3. Position the new resistor, straight side down, with equal overlap from the contact strips to
the end of the winding.
4. Seat the resistor firmly in the slot (use a block of wood to press into position). The
top surface of the resistor must be level.
5. Lightly burnish the resistance wire by rubbing the top surface with a hardened drill rod
shank. This will ensure that the contact arm slides smoothly.
6. Rotate the contact arm by hand. Affirm that the arm rotates smoothly and maintains
contact with the resistor from contact strip to contact strip with no dragging. If necessary,
adjust the arm by bending it up or down.
7. Adjust the position of the stop arm on the center shaft in order to obtain strip-to-strip
travel of the contact arm. All set screws must be tight.
8. Replace the shaft bearing retainer.
9. Calibrate the potentiometer.
CalibrationSpringReplacement
1. Remove the shaft bearing retainer and contact arm.

SECTION 3 –MAINTENANCE 3-3
2. Remove the old calibration spring.
3. Install a new spring (when the center shaft of the potentiometer mechanism is turned
counterclockwise, the spring is wound tighter).
4. Replace the contact arm.
5. Loosen but do not remove three screws on underside.
6. Rotate the spring adjuster until slack is out of the spring and the contact arm lines up with
the contact strip. Tighten the screws.
7. Replace the shaft bearing retainer.
8. Calibrate the potentiometer.
PotentiometerCalibration
Depending on the frequency of its use, the potentiometer mechanism should be recalibrated
regularly and whenever the spring, contact arm, or resistor is adjusted or replaced. Higher
operating temperatures in the pressure chamber require more frequent recalibration of the
potentiometer.
Refer to the enclosed drawings of the calibration table assembly and Model 7322 assembly.
The step-by-step calibration procedure is as follows:
1. Rotate the pot mech calibration table out to the side of the instrument.
2. Install the potentiometer on the calibration table and insert the wedge into the open slot as
shown.
3. Wrap the steel cable around the potentiometer frame and over the pulley. Place the
hanger weight hook in the cord eye.
4. Install the wire-end clips to the potentiometer tabs. (Note the wire locations.)
5. Insert the plug on the end of the calibrator wires into the calibrator socket.
6. Turn on the master switch and place 400 grams of weight on the hanger.
7. The Bearden unit gauge should read 100 Bc. (100 Bearden Units is 1 volt). The contact
points of the spring should be oiled, the weights lifted and released, and the calibrator
lightly tapped to offset friction during the calibration. If the unit does not read 100 Bc,
manually adjust the pot mech calibration screw located on the face panel of the top
cabinet.
8. Refer to Drawing 07-0520, which is a typical calibration curve. The radius of the
potentiometer mechanism is 5.2 centimeters and is multiplied by the total weight on the
hanger to obtain gram centimeter torque.
9. Slurry consistency is expressed in Bearden units where 100 Bc is equivalent to the spring
deflection observed with 2080 gcm of torque (400 grams weight) using the weight-loaded
calibration device.
10. For further calibration details, refer to API Spec 10 booklet. This unit is supplied with
weights to accommodate the full range of tests per API specs.
MagneticDrive
The magnetic drive should be flushed with clean water or oil whenever cement spills into the
cylinder or particles contaminate the drive. More frequent flushing of the drive is required
when high-temperature, high-pressure tests are run.

3-4 SECTION 3 –MAINTENANCE
The inner magnetic shaft must be pulled and inspected. Replace the complete assembly if the
magnet sleeve is worn through or bulging at the center. Remove the magnetic housing drain
plug and flush all cement sediment from the cylinder using water. Dry any remaining water
on the cylinder floor using towels. Inspect and replace the following components as
required.
•Carbon bearing: Remove and clean all cement from the O.D. and I.D. of the bearing. Clean
all cement from the external grooving. Replace the carbon bearings when excessive
chipping is visible. Replace the carbon bearing if the O.D. or I.D. has lost .010” of
material. The bearing must fit snugly on the shaft with no visible wobble.
•Bronze bearing: Remove and clean all cement from the O.D. and I.D. of the bearing. Clean
all cement from the perimeter weep holes. Replace the bronze bearing if when the upper
collar has lost .030” off its original height.
•Thrust ring: Replace the ring if a groove is present on the lower side. The lower surface
should be flat with no cutting or gouging occurring from contact with the bronze bearing
collar.
•O-ring & Backup ring: Replace at every cleaning or any time the drain plug is removed.
•Before the center shaft of the magnetic drive is reinstalled, the drain plug should be screwed
in (but not tightened) and the drive filled with clean oil. Then install the center shaft and
pressurize the cylinder with oil (air supply pressure only) to ensure that air is not trapped
in the lower part of the drive. Oil passing by the plug will purge the air.
ThermocoupleandTemperatureControl System
API specs require that the temperature measuring system be verified for accuracy monthly.
No equipment is supplied with the unit for performing these tests. Review your API specs
for details and contact Chandler Engineering.
Three Months
OilandFilter
The mineral oil in the reservoir should be drained and replaced when it becomes dirty. At the
same time, the oil filter element should be replaced. A drain plug is provided on the oil
reservoir, and a fill plug is located on top. Additions of mineral oil prior to oil drainage and
replacement may be made by pouring oil into the pressure cylinder. The mineral oil supplied
with the instrument is white technical oil (API gravity approximately 24.2, pour point 40°C,
flash 214°C, and viscosity 60 to 63 SSU at 38°C). This oil may be ordered from the factory.
DriveMotor
API requires that the speed be checked and maintained at 150 rpm +- 15 rpm. A motor speed
adjustment screw is located on the rear of the electrical cabinet. A tachometer for this test is
user supplied.