IKA RW 20 Digital Mechanical Overhead Mixer Instruction Manual

IKA RW 20 Digital Mechanical Overhead Mixer

Specifications

• Model: RW 20 digital
• Operating Instructions Language: English (EN)
• Speed Range: Variable from min to max RPM
• Motor Power: PM = PW
• Motor Speed Display: nnMW
• Output   Shaft Torque: MW
• Motor Torque: MM

Product Usage Instructions

• Safety Instructions
  • Always ensure good stability of the entire structure.
  • Remove the chuck key from the chuck before turning on the device.
  • Avoid operating the instrument with stirrer tools rotating freely to prevent accidents.
  • Wear appropriate personal protective equipment based on the materials being processed.
  • Be cautious of flammable materials and potential glass breakage due to mechanical shaking power.
• Commissioning
  • Unpack the product carefully.
  • Secure the device in a stable position.
  • Switch on the machine following safety guidelines.
• Maintenance and Cleaning
  • Regularly clean the equipment to prevent damage.
  • Refer to the user manual for specific maintenance instructions.

FAQs

• Q: What should I do if the medium splashes out of the vessel?
  • A: Reduce the speed to prevent splashing due to high speed.
• Q: How can I ensure safety while using the product?
  • A: Wear appropriate personal protective equipment, avoid loose clothing or jewelry that can get caught, and follow all safety instructions provided in the manual.

Declaration of conformity

• We declare under our sole responsibility that this product corresponds to the regulations 2014/35/EU, 2006/42/EC, 2014/30/EU, and 2011/65/EU and conforms with the following standards or standardized documents: EN 61010-1, EN 61010-1-2-051, EN 61326-1, EN 60529 and EN 12100.
• A copy of the complete EU Declaration of Conformity or further declarations of conformity can be requested at sales@ika.com.

Explication of warning symbols

• DANGER
  • Indicates an (extreme) hazardous situation, which, if not avoided, will result in death, or serious injury.
• WARNING
  • Indicates a hazardous situation, which, if not avoided, can result in death, or serious injury.
• CAUTION
  • Indicates a potentially hazardous situation, which, if not avoided, can result in injury.
• NOTICE
  • Indicates practices that, if not avoided, can result in equipment damage.

Safety Instructions

• Read the operating instructions in full before starting up and follow the safety instructions.
• Keep the operating instructions in a place where it can be accessed by everyone.
• Ensure that only trained staff work with the instrument.
• Follow the safety instructions, guidelines, occupational health and safety, and accident prevention regulations.
• Because the options for combining products, tools, stirring vessels, experiments, and mediums are nearly endless, user safety cannot be ensured simply with design requirements on the part of the product. For this reason, it may become necessary for users to take other precautionary safety measures. For example, glass apparatus or other stirring vessels that are sensitive to mechanical stress can be damaged or shattered by an imbalance, increasing the speed too quickly or too little distance between the stirring element and the stirring vessel. Users can suffer serious injury from glass breakage or the freely rotating stirring element.
• Uncontrolled reactions can be triggered by mixing the heated material insufficiently or by the energy generated by selecting a speed that is too high. In case of these and other increased operational hazards, users must take additional appropriate safety precautions (e.g. shatter protection). In any case, when using critical or hazardous materials in your processes, IKA® recommends using additional appropriate measures to ensure safety in the experiment. For example, users can implement measures that inhibit fire or explosions or comprehensive monitoring equipment. Furthermore, users must make sure that the OFF switch of the IKA® product can be accessed immediately, directly and without risk at any time, and above all, in case of fault.

CAUTION If the mains switch cannot ensure this access at all times, an additional EMERGENCY STOP switch that can be easily accessed must be installed in the work area.

• Only process media that will not react dangerously to the extra energy produced through processing. This also applies to any extra energy produced in other ways, e.g. through light irradiation.
• Do not operate the instrument in explosive atmospheres, with hazardous substances or underwater.
• Process pathogenic materials only in closed vessels under a suitable fume hood. Please contact IKA® application support if you have any questions.
• The instrument is not suitable for manual operation.
• The high torque developed by the RW 20 digital requires particular care in the choice of stand, cross sleeve, and anti-rotation element for the agitating vessel.
• Set up the stand in a spacious area on an even, stable, clean, non-slip, dry and fireproof surface.
• You must ensure that the stirring element is securely clamped in the chuck!

WARNING: Remove the chuck key from the chuck before turning on the device.

• Use stirring shaft protective equipment!
• The agitated vessels used for stirring have to be secured. Consider on the good stability of the entire structure.

WARNING Please pay attention to the dangerous parts of the equipment in Fig. 8.

• Protect the instrument and accessories from bumping and impacting.
• Check the instrument and accessories beforehand for damage each time when you use them. Do not use damaged components.
• Safe operation is only guaranteed with the accessories described in the ”Accessories” section.
• Always switch the mains switch in the OFF position or disconnect the power before changing the stirring element and fitting allowed accessories.
• The instrument can only be disconnected from the mains supply by pulling out the mains plug or the connector plug.
• The socket for the mains cord must be easily accessible.
• The socket must be earthed (protective ground contact).
• The voltage stated on the type plate must correspond to the mains voltage.
• Please observe the permitted speed for the stirring element. Never set a higher speed.
• Make certain that the unit is set at the lowest speed before commissioning; otherwise, the unit will begin running at the speed set in last operation. Gradually increase the speed.
• Pay attention when setting the speed to any imbalance of the stirrer tools and possible spraying of the medium to be stirred.

WARNING: Never operate the instrument with the stirrer tools rotating freely. Ensure that parts of the body, hair, jewelry or items of clothing cannot be trapped by the rotating parts.

WARNING: The operation of a free-rotating shaft end is dangerous. Therefore, for safety reasons, only insert the stirring tool over the upper edge of the housing at a standstill.

WARNING: Wear your protective equipment per the hazard category of the medium to be processed. Otherwise, there is a risk of:

• splashing of liquids
• projectile parts
• body parts, hair, clothing and jewelry getting caught.

NOTICE Beware of the risk of:

• flammable materials
• glass breakage as a result of mechanical shaking power.

NOTICE Reduce the speed if:

• the medium splashes out of the vessel because the speed is too high
• the instrument is not running smoothly
• the instrument begins to move around because of dynamic forces
• an error occurs.

WARNING: Do not touch rotating parts during operation!

• There may be electrostatic activity between the medium and the output shaft which could cause a direct danger.
• It is important to note that the surfaces of the motor (cooling fins) and certain parts of the bearing may get very hot during operation.
• Never cover the ventilation slots or cooling fins on the motor or the instrument.
• Avoid knocking and impacting on the lower end of the shaft and the chuck gear teeth. Even minor, invisible damage can lead to imbalance and uneven shaft action.
• Ensure that the stand does not start to move.
• Imbalance of the output shaft, the chuck, and in particular the stirring tools can lead to uncontrolled resonant vibrational behavior of the instrument and the whole assembly. Glass apparatus and stirrer containers can be damaged or shattered by this. It can cause injury to the operator and also can damage the rotating stirring tool. In this case, exchange the stirring tool for one without imbalance or remedy the cause of the imbalance. If there is still imbalance, return it to the dealer or the manufacturer along with a description of the fault.
• If the instrument is operated too long in overload or if the ambient temperature is too high, the instrument switches off permanently.
• The machine must only be opened by trained specialists, even during repair. The instrument must be unplugged from the power supply before opening. Live parts inside the instrument may still be live for some time after unplugging from the power supply.

NOTICE: Covering or parts that are capable of being removed from the unit without accessory equipment have to be reattached to the unit for safe operation in order to prevent, for example, the ingress of fluids, foreign matter, etc..

NOTICE: The unit must be switched off (motor standstill) before changing to another gear speed, otherwise the toothed gears in the reduction stage will be damaged.

Correct use

• Use:
  • For mixing/stirring liquids with low to high viscosity use various stirring tools.
  • Intended use: Stand device (Chuck downward).
• Range of use (indoor use only):
  • Laboratories
  • Schools
  • Pharmacies
  • Universities

This equipment is suitable for use in all areas except:

• Residential areas
• Areas that are connected directly to a low-voltage supply network that also supplies residential areas.

The safety of the user cannot be guaranteed:

• If the instrument is operated with accessories that are not supplied or recommended by the manufacturer
• If the instrument is operated improperly or contrary to the manufacturer’s specifications
• If the instrument or the printed circuit board are modified by third parties.

Unpacking

• Unpacking:
  • Please unpack the device carefully.
  • In the case of any damage a detailed report must be sent immediately (post, rail or forwarder).
• Delivery scope:
  • RW 20 digital overhead stirrer
  • user guide
  • chuck key
  • warranty card.

Useful information

• The speed can be infinitely adjusted between 60 and 2000 rpm 50 Hz; and 72 and 2400 rpm 60 Hz. The machine can be operated continuously and warms up during operation.
• The generously proportioned cooling surfaces enable the distribution and transference of heat to be as even as possible.
• The two-meter-long mains lead makes it possible to work on stands – even with high glass apparatus under vapor extraction hoods – without extension leads.
• The precision stirrer shaft is designed as a hollow shaft to allow the stirrer shanks to be inserted.

Drive

• The motor can be infinitely adjusted via a friction wheel drive unit but is operated in one position only.
• The power output, rotational speed, and torque of the motor are regarded as constant and are optimized for this operating position.
• After the friction wheel drive the motor power output is transmitted to the output shaft of the stirrer via either the first or second stage of the subsequent manually adjustable toothed gear train.
• Neglecting all losses, the power at the output shaft during power transmission (conversion) is always as great as the power output of the motor. The gear train merely provides rpm and torque conversion, which can be described in purely theoretical terms by the characteristic curve plotted in Fig. 2.
• Friction wheel wear is kept low by a helical clutch matched to the gear train. The down-pressure required at the friction wheel is adjusted by the helical clutch according to the moment acting on the stirrer shaft. A low torque results in a low down pressure; a high torque results in a high down pressure.

Motor circuit breaker

• The ball race capacitor motor is maintenance-free. In its winding, it carries a special overheating circuit breaker (self-locking temperature limiter) which shuts down the motor permanently if the permissible motor temperature is exceeded.
• This special type of circuit breaker is used when the automatic reactivation of the protected unit after overheating is undesirable or impermissible. The principle of the temperature limiter is that of a switch that heats up and isolates the motor from the power supply when the maximum permissible temperature is reached.
• When the self-locking temperature is exceeded, Err. 5 is shown on the display (see section “Error codes“).
• In this case, the unit can only be switched back on after it has been switched off for approx. 4-5 minutes by pressing the rocker switch (A, see Fig. 1) on the front or by disconnecting the mains plug.
• After this short cooling, the contacts in the current circuit are closed again and the unit is operational once more. (Fig 3)
• The gears could be taken out of the mesh by turning in a counterclockwise direction to the bearing bushing on the black knurled surface (E, see Fig. 1) above the chuck. The center axis of the stirring device is thus shifted in a radial direction.
• The bearing bushing is then axially positioned up or down per the range that is to be set.
• The gears are put back into mesh by turning the bearing bushing back (clockwise) and the center axis of the agitator is swiveled into the original position until the bearing bush engages again.
• It should be necessary to change the gear speed in the course of setting up an experiment or process with glass apparatus, then attention must be paid to the movement of the stirrer element by the eccentric bearing bush and to the movement in the axial direction. If this is unacceptable, the stirrer element must be loosened in the chuck.
• WARNING: Only change the gear position at a standstill!

Output shaft

• The clamping chuck and output shaft permit clamping IKA® recommend stirrer tools (see “Permitted IKA® Stirrer tools“ section).
• The output shaft is designed as a hollow shaft, and the opening on the top side of the housing is closed with a stirrer cover.
• When the stirrer cover is opened, the stirring shaft can be pushed out over the top edge of the housing at a standstill, e.g. during the changing container.
• For safety reasons, the stirrer cover must be pushed back into the opening of the housing so that it is properly closed.
• This is the only way to ensure that working with the unit is safe and that media cannot enter the instrument.
  • NOTICE: Please see section “Safety instructions“!

Speed display

• The rotation speed is adjusted utilizing the rotary knob (B, see Fig. 1) of the overhead stirrer.
• The rotational speed is displayed directly in revolutions per minute (rpm) on the display (C, see Fig. 1).

Commissioning

• Assemble the overhead stirrer and all necessary accessories on a stable, even, non-slip surface. The RW 20 digital overhead stirrer must be secured to a stable stand with a crosssleeve.
• The stirring vessel must always be securely fixed for safety reasons. You must also ensure that the mounting device (stand) is set up in such a way that it is not liable to topple and does not start to move during the stirring procedure.
• Accessories must be assembled according to the following assembly instructions (Fig. 4 to Fig. 8).
• If the above conditions are met, the instrument is ready for operation after plugging in the mains plug.

Securing

Securing the stirrer to the stand

• Diagram (see Fig. 4)
• Attach the cross sleeve (H) to the upright of the stand (I).
• Attach the extension arm (J) to the side of the cross sleeve not in use, with the opening facing upwards.
• Tighten both clamping bolts (G) firmly once the desired position for the stirring procedure has been adjusted correctly.
• Check that the stirrer is held in position firmly before each use and also at regular intervals. The position of the stirrer must only be adjusted when the equipment is stationary and the power supply is disconnected.

Securing a stirring element using the chuck

WARNING: Remove the chuck key from the chuck before turning on the device.

• Diagram (see Fig. 5)
• Slide the stirring tool (M) into the chuck (L). Tighten the chuck firmly using the chuck key (K).
• The stirring tool must only be changed when the equipment is stationary and the power supply is disconnected.

Securing the stirring shaft protector

• Diagram (see Fig. 6)
  • Use a stirring shaft protector (Q), e.g. R 301, to protect against injury when working with the equipment.
  • Use the bolts (U) to attach the plastic half-shell pieces to the stirrer (T), as shown in Fig. 6. The screw (S) can be used to adjust the length of the stirring shaft protector.
  • Check that the stirring shaft protector is held in position securely before each use and also at regular intervals.
  • The position of the stirring shaft protector must only be adjusted when the equipment is stationary and the power supply is disconnected.

Securing the mixing vessel to the stand

• Diagram (see Fig. 7)
• First, fix the strap clamp (X) to the stand (I). Adjust the strap clamp (X) position according to the position of the stirrer and mixing vessel (V) before tightening the clamp bolt (Y).
• Clamp the mixing vessel (V) with the flexible clamping band (W).

Switching on the device

• Check whether the voltage given on the type plate corresponds to the available mains voltage.
• The socket used must be earthed (fitted with earth contact).
• If these conditions have been met, the machine is ready to operate when the mains plug is plugged in.
• If these conditions are not met, safe operation is not guaranteed and the machine could be damaged.
• During the commissioning of the machine, the output shaft starts to run at the last speed set. Ensure that the speed set is suitable for the test medium selected.
• If in doubt, set the speed knob to the lowest speed. In case of doubt use the rotary knob (B, see Fig. 1) to set the lowest speed and set the drive at the lowest speed position (backside, refer to the attachment on the side of the overhead stirrer).
• The unit starts to run when the rocker switch (A, see Fig. 1) is switched to the I position.
• If the unit has not been used for some time, a knocking noise will be heard when switched on, which is due to the preload on the friction lining of the friction wheel drive.
• This has no detrimental effect on the function of the unit, and the knocking noise will disappear after a short running-in period.

Maintenance and cleaning

The equipment is maintenance-free. It is only subject to the natural wear and tear of components and their statistical failure rate.

Cleaning:

For cleaning disconnect the main plug!

Use only cleaning agents that have been approved by IKA® to clean the instrument.

• Dirt /Cleaning agent
  • Dye isopropyl alcohol
  • Construction material water containing tenside/ isopropyl alcohol
  • Cosmetics water containing tenside/ isopropyl alcohol
  • Foodstuff water containing tenside
  • Fuel water containing tenside

For materials that are not listed, please request information from IKA®. Wear protective gloves while cleaning the instrument. Electrical devices may not be placed in the cleansing agent for cleaning. Do not allow moisture to get into the equipment when cleaning. Before using another than the recommended method for cleaning or decontamination, the user must ascertain with IKA® that this method does not destroy the instrument. When cleaning the unit, take particular care not to bring substances containing oil or grease into contact with the running surfaces of the cone pulley and the friction wheel. This would substantially reduce the frictional coefficient resulting from the pairing of the friction wheel and cone pulley materials and would impair power transmission in the unit.

Spare parts order When ordering spare parts, please give:

• machine type
• serial number, see type plate
• item and designation of the spare parts, see www.ika.com.

Repair:

• Please send equipment for repair only after it has been cleaned and is free from any materials that may constitute a health hazard.
• For repair, please request the “Decontamination Certificate” form IKA® or use the download printout of it from
• IKA® website: www.ika.com.
• If you require servicing, return the equipment in its original packaging. Storage packaging is not sufficient. Please also use suitable transport packaging.

Error codes

The fault is shown by an error code on the display (C) as follows if the error occurs, e.g. Err. 5.
Proceed as follows in such cases:

• Switch the device switch (A) off.
• Remove the stirrer tool and remove the instrument from the assembly.
• Reduce the speed and switch on (instrument switch (A)) the device without the stirrer tool.

–  Decrease the motor’s load and restart again

Err. 4| Motor blocked or overloaded| motor off| – Switch off the instrument

If the actions described fail to resolve the fault or another error code is displayed then take one of the following steps:

• Contact the service department
• Send the instrument for repair, including a short description of the fault.

Warranty

• Following IKA® warranty conditions, the warranty period is 24 months.
• For claims under the warranty please contact your local dealer. You may also send the machine directly to our factory, enclosing the delivery invoice and giving reasons for the claim. You will be liable for freight costs.
• The warranty does not cover worn-out parts, nor does it apply to faults resulting from improper use, insufficient care, or maintenance not carried out per the instructions in this operating manual.

Accessories

• R 1825 Stand
• R 1826 Stand
• R 1827 Stand
• R 182 Cross-sleeve
• RH 3 Strap clamp
• FK 1 Flexible coupling
• R 301 Stirrer shaft protection
• R 301.1 Support holder

Permitted IKA® stirrer tools

recommended speed (rpm)

• R 1311 Turbine stirrer ≤ 2000
• R 1312 Turbine stirrer ≤ 2000
• R 1342 Propeller stirrer ≤ 2000
• R 1381 Propeller stirrer ≤ 2000
• R 1382 Propeller stirrer ≤ 2000
• R 1389 Propeller stirrer (PTFE) ≤ 800
• R 1300 Dissolver stirrer ≤ 2000
• R 1303 Dissolver stirrer ≤ 2000
• R 1330 Anchor stirrer ≤ 1000
• R 1352 Centrifugal stirrer ≤ 2000

recommended speed (rpm)

• R 3000.1 Moebius stirrer ≤ 800
• R 3001.1 Moebius stirrer ≤ 800
• R 3003 Spiral stirrer ≤ 800
• R 3003.1 Spiral stirrer ≤ 800
• R 3003.2 Spiral stirrer ≤ 800
• R 3004 Blade stirrer ≤ 1000
• R 3004.1 Blade stirrer ≤ 1000
• R 3004.2 Blade stirrer ≤ 1000

Technical data

Speed range:                 (50 Hz stage I ) (50 Hz stage II ) (60 Hz stage I ) (60 Hz stage II )| rpm| 60–500

240–2000

72–600

288–2400

---|---|---
Speed adjustment|  | Stepless
Speed display|  | Display (LED)
Speed setting accuracy| rpm| ± 1
Speed measurement deviation| rpm| ± 30
Max. torque at stirrer shaft: (at 60 rpm)

(at 100 rpm)

(at 1000 rpm)

| Ncm| 300 (overload)

150

24

Maximum stirring quantity (water)| ltr| 20
Max. viscosity| maps| 10000
Permitted on-time| %| 100
Nominal voltage| VAC| 230 ± 10 % / 115 ± 10 %
Frequence| Hz| 50 / 60
Input power| W| 72 (230 V / 50 Hz)

87 (115 V / 60 Hz)

Output power| W| 35
Output power shaft

(measured at 400 rpm in stage I , 230V 50 Hz)

| W| 35
Protection type to EN 60529|  | IP 20
Protection class|  | I (protective earth)
Excess voltage category|  | II
Contamination level|  | 2
Protection at overloaded|  | Yes / temperature sensor in motor winding
Ambient temperature| °C| + 5 … + 40
Ambient humidity (rel.)| %| 80
Drive|  | Rib-cooled capacitor motor with friction wheel drive and subsequent 2-stage toothed gear train
Clamping chuck − clamping range| mm| 0.5–10
Hollow shaft internal diameter (Ø)| mm| 10.5
Extension arm (Ø x L)| mm| 13 x 160
Housing|  | Coated aluminum casting and thermoplastic plastic
Dimension (W x D x H) (without extension arm)| mm| 88 x 212 x 294
Weight (with extension arm and clamping chuck)| kg| 3.1
Operation at a terrestrial altitude| m| max. 2000

Subject to technical changes!

CONTACT INFORMATION

• USA
  • IKA Works, Inc.
  • Phone: +1 910 452-7059
  • Email: sales@ika.net
• MALAYSIA
  • IKA Works (Asia) Sdn Bhd
  • Phone: +60 3 6099-5666
  • Email: sales.lab@ika.my
• JAPAN
  • IKA Japan K.K.
  • Phone: +81 6 6730 6781
  • Email: info_japan@ika.ne.jp
• VIETNAM
  • IKA Vietnam Company Limited
  • Phone: +84 28 38202142
  • Email: sales.lab-vietnam@ika.com
• KOREA
  • IKA Korea Ltd.
  • Phone: +82 2 2136 6800
  • Email: sales-lab@ika.kr
• CHINA
  • IKA Works Guangzhou
  • Phone: +86 20 8222 6771
  • Email: info@ika.cn
• INDIA
  • IKA India Private Limited
  • Phone: +91 80 26253 900
  • Email: info@ika.in
• Thailand
  • IKA Works (Thailand) Co. Ltd.
  • Phone: +66 86 375 7451
  • Email: sales.lab-thailand@ika.com
• BRAZIL
  • IKA Brazil
  • Phone: +55 19 3772 9600
  • Email: sales@ika.net.br
• POLAND
  • IKA Poland Sp. z o.o.
  • Phone: +48 22 201 99 79
  • Email: sales.poland@ika.com
• UNITED KINGDOM
  • IKA England LTD.
  • Phone: +44 1865 986 162
  • Email: sales.england@ika.com
• Turkey
  • IKA Turkey A.Ş.
  • Phone: +90 216 394 43 43
  • Email: sales.turkey@ika.com.
  • Discover and order the fascinating products of IKA online: www.ika.com.
  • Technical specifications may be changed without prior notice.

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