Coming Soon:
M121 Dissolved-Oxygen Measurement System
Introducing the Rank Brothers M121, a next‑generation dissolved‑oxygen measurement system engineered for high‑precision fluid analysis.
It employs a fully digitised architecture that combines the strengths of the analogue Model 10 and Model 20 into a single platform, improving signal
stability, response accuracy, and calibration reliability.
The M121 retains proven Clark‑type sensing while incorporating modern
electronics, lower‑noise performance, and streamlined control interfaces
for robust, repeatable oxygen quantification across a broad measurement
range.
If you would like to find out more about the M121 ahead of its release, please contact our team.
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Key Features
Touchscreen Display.
Four stirring modes:
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Constant speed clockwise.
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Constant speed anticlockwise.
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Automatic reversing mode, slow acceleration.
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Automatic reversing mode, fast acceleration.
Stirring speeds from 100-1800 rpm.
Capture functionality to grab a dislodged stirring bar without having to adjust the speed.
Soft start to ensure stirrer bar pickup.
3 output sockets for a variety of heads to be driven simultaneously.
Size
Width
100mm
Depth
155mm
Height
75mm
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Key Benefits
Precision
A rapid‑response Clark‑type sensor engineered for high sensitivity, even at low oxygen levels.
Customisation
Flexible chamber designs that support specialised or unconventional samples
beyond fixed‑format multiwell systems.
Versatility
Compatible with a wide range of sample volumes and biological sample types.
Affordability
A lower‑cost alternative to
high‑throughput platforms, with reduced long‑term operating expenses
Modern interface
A modern 7" touch screen interface that streamlines stirring control, calibration, and data viewing.
Scalability
A compact accessory range that expands lab capability without replacing existing hardware.
Advantages over motor driven stirrers
The stirring heads produce considerably less electrical noise than motor driven type stirrers making them ideal for applications where sensitive electronic instrumentation is used to monitor the fluid.
No moving parts make the heads very reliable.
All heads driven from the control unit run at exactly the same speed.
The lack of any moving parts reduces the heat generated by the head, protecting the sample from any excessive heat incurred from a motor driven stirrer.
Expansion module
Increase the controller's ability to stir more cuvettes by adding up to 3 of our expansion ports.
Each port facilitates 3 cuvette stirrers to be added to the controller, but each will use one of the control unit's ports:
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Add 1 port = 5 cuvette stirrers.
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Add 2 ports = 7 cuvette stirrers.
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Add 3 ports = 9 cuvette stirrers.
The same control unit powers all.
Specifications
Width
100mm
Depth
50mm
Height
40mm
Stirring bars
We offer a range of stirring bars in both glass and PTFE
encapsulation.
Need something specific? Challenge us to make it for you.
OEM
We’ve partnered with many spectrometer manufacturers in the past to provide cuvette stirrers to their exact requirements.
Alternatively, purchase our existing design without the plug, ready to incorporate straight into your cell holders.
Coming soon! OEM-controlled PCB, let us do the difficult electronic control. All you need to do is send the required PCB running speeds and off you spin!