OFITE Model 25 Constant Speed Blender

Introduction

OFITE's Model 25 Constant Speed Blender is engineered to prepare well cements and fracturing fluids for testing, adhering to the guidelines specified in API documents. Research indicates that the properties of these fluids are significantly influenced by mixing procedures. Studies have shown that using constant speed blenders/mixers leads to greater reproducibility in testing data and better correlation with results from other laboratories. The Model 25 is designed to provide a consistent method for preparing these fluids for testing purposes, suitable for mixing cements and fracturing fluids according to API procedures.

Description

The Model 25 Constant Speed Blender features two primary modes: Cement (for mixing cement slurries per API guidelines) and Frac (for mixing fracturing fluids).

Cement Mode

In Cement Mode, the user weighs the appropriate amount of mix water and pours it into the blender's mixing container. Upon pressing the CEM button, the blender automatically sets the rotational speed to 4,000 rpm for 15 seconds. The user then adds the dry cement to the mix water. After 15 seconds, the blender automatically increases the rotational speed to 12,000 rpm and mixes the slurry for an additional 35 seconds.

Frac Mode

In Frac Mode, the components for mixing are added to the blender's mixing container. After pressing the FRAC button, the blender automatically sets the speed to 1,500 rpm and the timer for 5 minutes.

The internal microprocessor ensures that the rotational speed remains constant, unaffected by fluctuations in line voltage or the viscosity of the fluid being mixed.

Components

Standard Components:

• #122-202: Stainless Steel Mixing Container, 1 Quart (For Cement)
• #122-203: Lid for Mixing Container
• #120-64-503: Blender Adapter
• #152-64: Glass Mixing Container, 1 Quart (For Fracturing Fluids)

Optional Components:

• #120-64-SP: Spare Parts Kit
• #122-200: Blending Assembly / Square Drive, Qty: 12
• #122-202: Blending Container, Stainless Steel
• #122-203: Lid for Blending Container
• #122-204: Bottom Gasket, Qty: 6
• #122-207: Blade

Specifications

• Hardened stainless steel mixing blades.
• 1-liter mixing container: Stainless steel for cement mixing, glass for fracturing fluids.
• Operation modes: One preset API mixing program, three user-defined programs, and variable speed operation.
• Speed Range (no load):
  • Cement Mode: 500 - 25,000 rpm
  • Frac Mode: 300 - 5,000 rpm
• Rotational speed is maintained at setpoint by microprocessor.
• Timer automatically controls mixing times at required RPM.
• Digital instrumentation provides excellent readability.
• Motor: 2 hp.
• Power Requirements: 115 VAC, 13 Amp / 230 VAC, 6.5 Amp.

Operation

Automatic Mode (Cement)

1. Press the POWER button to turn the unit on.
2. Fill the mixing container with the appropriate volume of water for your slurry.
3. Place the mixing container on the blender base.
4. Press the CEM button to start a cement mixing routine. The blender will automatically set the rotational speed to 4,000 rpm and the timer to 15 seconds.
5. Add the dry cement to the mixing cup within 15 seconds. The blender will automatically set the rotational speed to 12,000 rpm and the timer to 35 seconds.
6. When the timer is complete, the blender will stop. Remove the mixing container and continue with further testing.
7. After mixing is complete, clean the mixing container and lid as soon as possible to prevent any cement from building up.

Automatic Mode (Fracturing Fluid)

1. Press the POWER button to turn the unit on.
2. Fill the mixing container with the components to be mixed.
3. Place the mixing container on the blender base.
4. Press the FRAC button to start mixing. The blender will automatically set the rotational speed to 1,500 rpm and the timer to 5 minutes.
5. When the timer is complete, the blender will stop. Remove the mixing container and continue with further testing.
6. After mixing is complete, clean the mixing container and lid as soon as possible to prevent build up.

Manual Mode

1. Press the POWER button to turn the unit on.
2. Press the SPEED + / - buttons to adjust the rotational speed.
3. Press the TIME + / - buttons to adjust the timer. Set the timer to 0 for a user-timed operation.
4. Press the START/STOP button. The speed and time can be adjusted during mixing.
5. Press the STOP button to stop the blender immediately. Otherwise, the blender will stop when the timer reaches zero.
6. After mixing is complete, clean the mixing container and lid as soon as possible to prevent any cement from building up.

Programming

The Model 25 Constant Speed Blender features four program buttons. By default, they are programmed as follows:

In Cement Mode:

• CEM: Performs an API cement mixing protocol. Sets speed to 4,000 rpm for 15 seconds and then 12,000 rpm for 35 seconds. This program cannot be altered.
• P1: Sets speed to 4,000 rpm for 15 seconds.
• P2: Sets speed to 12,000 rpm for 35 seconds.
• P3: Sets speed to 4,000 rpm for a user-timed duration and then 12,000 rpm for 35 seconds.

In Frac Mode:

• FRAC: 1,500 rpm for 5 minutes.
• P1: 500 rpm with no time limit.
• P2: 2000 rpm with no time limit.
• P3: 5000 rpm with no time limit.

To change the programming of the P1, P2, or P3 buttons:

1. Press and hold the SPEED + and SPEED - buttons simultaneously for three seconds.
2. Press the button you wish to program (P1, P2, or P3). The CEM and FRAC buttons cannot be programmed.
3. Press the SPEED +/- buttons to adjust the speed.
4. Press the TIME +/- buttons to adjust the time.
5. Press the program button (P1, P2, or P3) to save these settings and move to the next step.
6. Repeat steps 3-5 for each step of the program. You can program up to 10 steps for each button.
7. When you have finished adding steps, press the START/STOP button.
8. Press the START/STOP button to exit programming mode and return to the home screen.

Configuration

1. To access the configuration menu, press and hold the TIME + and TIME - buttons simultaneously for three seconds.
2. Press the SPEED +/- buttons to select a setting.
3. Press the TIME +/- buttons to change the setting.
4. Press the START/STOP button to save the setting and exit.

Configuration Options:

• LARGE FONT: Select YES to use a large font during mixing.
• MAX TIME: This setting defines the maximum mixing time (MM:SS) allowed, ranging from 1 to 99 minutes in 1-minute increments. The time setting for all saved programs will be clipped to this limit. Lowering the MAX TIME limit may alter existing programs and cause them to perform unexpectedly.
• POWER OFF: Select AUTO to have the mixer power itself off after 30 minutes of inactivity. Select MANUAL to only turn off the mixer when the POWER button is pressed.
• FACTORY RESET: Select Y to reset all settings and programs to the factory defaults.

Warranty and Return Policy

Warranty:

OFI Testing Equipment, Inc. (OFITE) warrants its products to be free from liens and defects in title and to conform to the terms of the sales order and applicable specifications. Products are furnished subject to OFITE's standard manufacturing variations and practices. Unless otherwise extended in writing, the warranty applies for twelve (12) months from the invoice date. If a product or part thereof does not conform to these warranties and OFITE is notified in writing upon discovery, OFITE shall promptly repair or replace the defective product. OFITE's warranty obligations do not extend to products used under conditions more severe than recommended or to defects visually observable but not promptly reported.

If installation and commissioning services were purchased, the warranty extends for an additional twelve (12) months from the original warranty expiration.

For customized research and development services, OFITE will use its best efforts but makes no guarantees regarding product provision.

OFITE disclaims all other warranties, express or implied, including but not limited to warranties of FITNESS FOR PURPOSE, MERCHANTABILITY, AND OTHER STATUTORY REMEDIES, which are expressly waived.

Limited Warranty Exclusions:

This limited warranty does not cover losses or damages resulting from:

• Improper installation or maintenance.
• Misuse.
• Neglect.
• Adjustment by non-authorized sources.
• Improper environmental conditions.
• Excessive or inadequate heating/air conditioning or electrical power failures, surges, or other irregularities.
• Equipment, products, or material not manufactured by OFITE.
• Firmware or hardware modified or altered by a third party.
• Consumable parts (bearings, accessories, etc.).

Returns and Repairs:

Items returned must be carefully packaged to prevent shipping damage and insured against loss. OFITE is not responsible for damage due to insufficient packaging.

Non-defective items returned within ninety (90) days of invoice are subject to a 15% restocking fee. Items must be received by OFITE in original condition to be accepted. Reagents and special order items are not eligible for return or refund.

OFITE provides experienced service and repair for its own equipment and that of other companies. To expedite repairs, include a repair form with all equipment sent to OFITE. The form should detail your name, company, phone number, email address, description of work, purchase order number, and return shipping address. Repairs performed as "repair as needed" have a ninety (90) day limited warranty. "Certified Repairs" have a twelve (12) month limited warranty.

Returns and warranty repairs require a Return Material Authorization (RMA) number, obtainable from your sales or service representative.

Ship all equipment (with RMA number) to:

OFITE also offers service contracts for repairing and maintaining lab equipment, including that from other manufacturers. For more information, contact techservice@ofite.com.