Model 300 Magnetic Stirrer

The Model 300 Magnetic Stirrer is a motorless magnetic stirrer that operates by generating a rotating electromagnetic field in the stirring heads. The liquid to be stirred has a magnetised stirring bar placed in it. The bar and therefore the liquid, is rotated by the magnetic field produced in the heads.

Modern microprocessor electronics have been used to deliver higher performance whilst maintaining the price levels of previous models of magnetic stirrer.

The Model 300 provides great flexibility for use with different sizes and types of vessels; it is particularly suitable for small specialised sample holders frequently used in electrochemical and spectrometric applications.

The magnetic stirrer has several advantages over conventional motor driven stirrers:

The stirring heads produce less electrical noise than motor type stirrers. With no moving parts they are very reliable.
Multiple heads can be connected to a single magnetic stirrer control box all stirring at the same speed.
Stirring head size is not constrained by motor sizes.

Main Features

Display of stirring speeds.
Four stirring modes:
- Constant speed, clockwise.
- Constant speed, counter clockwise.
- Auto reversing mode, slow acceleration.
- Auto reversing mode, fast acceleration.
37 discrete stirring speeds from 100 to 1800 rpm.
Capture Button to allow stirrer bar pick up without having to adjust the stirring speed.
Memory feature allows the stirrer to operate exactly as before switch off, with soft start on power up to ensure stirrer bar pick up.
Outputs protected from overloading by current limiting circuit.
Three output sockets allow up to twelve heads (depending upon type) to be simultaneously driven at the same speed from one magnetic stirrer control box.
Stirring speed independent of sample viscosity; limited only by power of Stirring Head.

Technical Data

Stirrer Control

Controls:

Power On/Off switch.
Speed increase button.
Speed decrease button.
Mode selector button - to select stirring mode.
Capture button - stops stirrer momentarily to allow stirring bar capture.
Four digit display of stirring speed.
Decimal point indicates stirring mode.

Supply Voltage:

User selectable 100/110V or 220/240V AC 50/60Hz.

Outputs:

3 off 5 pin DIN sockets for stirring heads. Maximum drive capability 15V 8W protected by current limiting circuitry. Will control up to:
- 3 off Type 1 Stirring Heads.
- 2 off Type 2 Stirring Heads.
- 12 off Type 3 Stirring Heads (requires multiple heads wired to each plug).
Plus various combinations up to specified output limit.

Stirring Speed:

37 speeds between 100 and 1800rpm.
Display accuracy ±2%.
Speed stability better than 300PPM.

Dimensions of Stirrer Control Box:

58mm (h) x 215mm (w) x 215mm (d).
1.2kg (excluding stirring head and power lead).

Stirring Heads

Type One:: Designed for use with the Rank Brothers range of Oxygen Electrodes. The stirrer body is 38mm diameter stainless steel tube with an acrylic base 89mm diameter. The overall height is also 89mm and weighs 0.45kg. The unit is sealed and may be immersed in water baths with a temperature range of 10-50°C.
Type Two:: A stirring head for general laboratory use; suitable for beakers and flasks up to one litre. The head is 90mm in diameter, 68mm high and weighs 1.2kg.
Type Three:: A stirring head designed for use with 10ml cuvettes. The head is 12mm square and 7.5mm high and weighs 30g. Up to four heads may be wired to a single plug to enable twelve heads to be powered by a single stirrer control unit. Rank Brothers are able to modify most spectrophotometer cell holders to incorporate the stirring head without raising the cuvette to ensure no interference with the beam. Thermostatting of the cell may also be possible.

Instruction Manual

The manuals on this website are provided as PDF files, please see the Downloads page for links to reader software.

Model 300 Electronic Stirrer Manual (225KB)

Ordering Information

When ordering a Model 300 please specify the stirring heads and stirring bars appropriate to the application.

Order Code	Description
MAG007B	Stirrer Model 300 Control Box only
MAG101A	Electronic stirring head Type 1
MAG102A	Electronic stirring head Type 2
MAG103A	Electronic stirring head Type 3
MAG300A	Magnetic stirring bar for cuvette
OXY328A	Stirring Bar for 1ml and 2.5ml Oxygen Electrodes
OXY329A	Stirring Bar for 4ml Perspex Oxygen Electrodes
OXY330A	Stirring Bar for 6ml and larger Oxygen Electrodes

Rank Brothers Ltd reserves the right to change specifications in the light of continuing development.

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