IKA RW 20
Objektnummer | B00012744 |
---|---|
ID-number | 012744 |
Object name | IKA RW 20 |
Status | Archiv |
Status, terms of delivery and payment
Verification of devices
The second-hand devices are verified by Labexchange Service GmbH before delivery. You are receiving only fully functional devices.
Dispatch time
The stated dispatch times are the shortest possible ones for each article. The effective dispatch times can vary. The effective dispatch times will be stated in the order confirmation.
As a matter of principle, we are offering collective deliveries. The shipping time is calculated based on the position with the longest lead time. A partial delivery is possible on explicit request.
Shipping methods
Parcel services, forwarding agencies, self-pickup, delivery by Labexchange fleet.
Delivery information
Prices exclude shipping costs. Stated shipping costs are to be expected. Deviations are possible. If transport costs are not specified, please ask separately for them.
The stated transport and packing charges apply to the most favorable route if transport and are to be understood as subject to verification due to unexpected cost increases. By reason of unpredictable events, cargo rates and delivery times can change at any time and therefore have to be adapted to the recent situation. Import formalities and possible customs charges will be borne by the purchaser. Incoterm coding according to Incoterms 2010: For persons who collect the devices themselves: EXW, for dipatch by sea: CFR, by air freight: CPT, other shipments: DAP. Note for international shipments: A proof of preference/EUR1 will not be issued by us. When self-collecting/ordering EXW from countries within or outside the European Union, 16% VAT will be retained as a deposit until we have received the corresponding confirmation of arrival/bill of delivery from the buyer.
Terms of payment
We do not accept payment by letter of credit, PayPal, etc. In each case the invoice amount is payable without deduction. Discount is not granted.
Country |
Possible payment methods |
Comment |
DE, AT, CH |
Payment by invoice, payment in advance, paymet by credit card |
Payment by invoice is only possible for corporate clients. |
NL, BE, LU |
Payment by invoice, payment in advance, payment by credit card |
Payment by invoice is only possible for corporate clients |
Other countries |
Payment in advance, payment by credit card |
|
Our General Terms of Sale, Delivery and Payment are valid and are available for download here.
The goods are offered subject to prior sale.
Definition of status
All articles are used articles, except an article is listed especially as a new device.
Status |
Condition |
Comment |
Immediately available |
Used | The article is fully functional and in impeccable condition. It can be shipped immediately. |
In stock |
Used |
The article is on stock. Our service technicians will verify the article before delivery. You are receiving only a fully functional article. |
Published |
Used |
The article is still with the provider. After your order the article will be purchased and verified by us before being shipped to you. A certificate of operativeness as well as a service report are included in delivery. |
New device |
new |
The article is brand new and unused. Regarding new equipment the guarantee/warranty conditions of the corresponding manufacturer apply. |
Labprocure |
Used |
Labprocure GmbH, as the advertiser, is responsible for the content of this device offer. Labprocure assumes liability for the offers advertised here and for the photos and offer texts included. Labprocure GmbH, Bruckstraße 58, 72393 Burladingen. |
The following illustrations and descriptions are referring to the instrument model and are drawn from brochures. They are not representing the delivery volume. The exact delivery content you will find only in the offering text.
Correct use
Stirrers in the RW20.n series are suitable for stirring and mixing Iiquids with Iow or high viscosity. They are designed for use in the laboratory. For correct use the machine must be fixed to a stand.
Useful facts
In buying this machine you have chosen a high quality product. Ease of use is guaranteed with its handy shape and simple operation. ration. The housing offers protection against ingress of liquids. The materials used and their precise identification make recycling possible and simple, and enables re-use of the parts. The speed can be infinitely adjusted between 60 and 2000 rpm 50 Hz; 72 and 2400 rpm 60Hz. The machine can be operated continuously and warms up during operation. The generously proportioned cooling surfaces enable distribution and transference of heat to be as even as possible. The two metre Ion mains lead makes it possible to work on stands - even with high glass apparatus under vapour 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 method of operation of the motor is characteristic of the operating behavior of the RW 20.n series units. 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 After the friction wheel drive the motor power position. output is transmitted to the off-drive shaft of the stirrer via either the first or second stage of the subsequent manually adjustable toothed gear train.
Neglecting all Iosses, the power at the off-drive 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.
Friction wheel wear is kept Iow 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 Iow torque results in a Iow down-pressure; a high torque results in a high down-pressure.
In order to be able to process high-viscosity media, the RW 20 DZM.n P4 does not have the second switchable reduction stage, but features instead a planetary gear train with a gear ratio of 3.7 1 immediately after the first toothed gear stage. This provides a speed range of 16 to 135 rpm at 50 Hz and 20 to 160 rpm at 60 Hz.
Gear Speed Change
RW 20.n and RW 20 DZM.n only
Should it 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 attachment by the eccentric bearing bush and to the movement in the axial direction. If this is unacceptable, the stirrer attachment must be loosened in the chuck.
Turning (Counter-clockwise) the bearing bush at the black knurled surface over the chuck disengages the gears. The center axis of the stirrer attachment shifts 2.2mm in the radial direction. The bearing bush is then moved 5.5mm up or down in the axial direction according to the range to be set. Turning back (clockwise) the bearing bush re-engages the gears and swings the center axis of the stirrer attachment back to its original position.
Motor Circuit Breaker
The ball race capacitor motor, protected to IP 42, is maintenancefree. 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 sensor is tripped, the yellow glow lamp (B) on the front plate of the unit lights up to indicate the motor overload and the stoppage of the motor. 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) on the front plate or by disconnecting the mains plug.
After this short cooling period, the contacts in the current circuit are closed again and the unit is operational once more.
Speed Display
The rotation speed is adjusted with the rotary knob (C) on the front plate of all RW 20.n stirrer units.
RW 20.n In the RW 20.n unit, a defined rotational speed is set via the scaling of the rotary knob position. The plate (Fig. 5) attached to the side of the unit lists the speeds attained at the set scale values. (The values apply only when Iow Ioads are acting on the stirrer shaft.)
RW 20 DZM.n In the RW 20 DZM.n unit, the rotational speed is displayed directly in revolutions per minute (rpm) on the LCD display (D). The display can only Show speeds up to max. 1999 rpm, which means that the off-drive shaft may be moving at a faster speed than displayed when there are Iow Ioads acting on the stirrer shaft.
RW 20 DZM.n P4 In the RW 20 DZM.n P4 unit, the rotational speed is displayed directly by the LCD display (D), as in the RW 20 DZM.n. As the toothed gear train is no longer adjustable and is set to the lowest speed, the entire rpm range can be displayed.
Commissioning
For correct use, the stirrer machine must be fixed with a cross sleeve (eg R181) to a stable stand (eg R1822). The stirrer container should always be fixed with a tensioner for safety reasons.
Output shaft
lf the unit has not been used for some time, a knocking noise will be heard when switching 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.
The chuck and off-drive shaft allow stirrer attachments with shank diameters of up to 10mm to be clamped and inserted (except RW20DZM.n P4). The opening at the top of the housing allows stirrer attachments to be pushed up above the top edge of the housing, e.g. in order to change the stirring bowl with the unit switched off.
Accessories
RW 20.n and RW 20 DZM.n
R 1823 Plate stand RH 1 Tensioner
R 181 Cross sleeve FK(1 Flexible coupling
R 182 Cross sleeve
RW 20 DZM.n P4
R 2723 Telescopic stand RH 2 Tensioner
R 261 Cross sleeve R 263 Bowl clamp
R 271 Cross sleeve
Associated standars and regulations
Associated EU guidelines
EMV guidelines: 89/336/EC
Machine guidelines: 89/392/EC
Construction in accordance with the following safety Standards:
EN 61 010-1 /VDE 411-1 EN 60 204-1
EN 50 081 EN 292-1, -2
EN 50 082-1 EN 414
EN 55 011 IEC 1010-1
EN 55 014-1 UL 3101-1
EN 60 555-2, -3 CAWCSA C22,2 (1010-1)
Technical data
Speed range
(RW20.n 1 RW20 DZM.n)
( 50Hz stage 1) min -1 60 - 500
( 50Hz stage II ) min -1 240 - 2000
( 60Hz stage 1 ) min -1 72 - 600
( 60Hz stage Ii ) min -1 288 - 2400
(RW20 DZM.n P4)
( 50Hz stage 1 ) min -1 16 - 135
( 50Hz stage II ) min -1 20. 160
Max torque stirrer shaft
(RW20.n 1 RW20 DZM.n) Ncm 185
(RW20 DZM.n P4) Ncm 700
Permitted on-time: % 100
Speed adjustment: Toggle knob
Speed display:
(RW20.n) Scale on front plate of unit
(RW20 DZM.n and RW20 DZM.n P4) LCD display
Measurement fault: max. ±0,5% ±30 Digit
Nominal voltage: VAC 230±10%
VAC 115±10%
Frequency: Hz 50 EURO
Hz 60 USA
Input power: W 72 EURO
W 87 USA
Power output: (short term) W 35
(constant operation) W 20 +35%
Overall efficiency: % 40
Protection type to DIN 40 050: IP 20
Exess voltage category: II
Contamination level: 2
Protection at overloaded: Temperature sensor in motor winding
Fuse (on mains plate): A 4 T (IKA ident.no. 25 85100)
Ambient temperature: °C +5 to +40
Ambient humidity: (rel.) % 80
Operating position:
on stand, clamping chuck pointing down
Drive: Rib-cooled capacitor motor wich friction wheel drive and subsequent 2-stage toothed gear train.
(RW 20 DZM.n P4 fixed at stage 1; planetary gear train i=3.7:1)
Maximum stirring quantity - water:
Itr 20
For viscosity:
(RW20.n 1 RW20 DZM.n) MV
(RW20 DZM.n P4) HV
Viscosity |
mPa - s |
|
|
VLV very low viscosity
LV Iow viscosity
MV medium viscosity
HV high viscosity |
0 100
100 1000
1000..10000
10000 100000 |
Water up to thin‑ bodied oil Thin-bodied oil up to thick-bodied oil Thick-bodied oil up to honey at approx. 20 °C Honey at approx. 20 °C up to inks/dyes |
Clamping chuck clamping range: mm 0,5 -10
Hollow shaft internal diameter: mm 10,5
Etension arm:
(RW20.n 1 RW20 DZM.n) mm 13x160 long
(RW20 DZM.n P4) mm 16x160 Iong
Housing: Al diecasting, thermoplastic
RW20.n RW20 DZM.n RW20 DZM.n P4
Dimensions without exten‑
sion arm (WxDxH) mm 88x188x292 88x210x292 88x210x402
Gewicht mit Ausleger
und Spannfutter: kg 2,9 3,1 4,6