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OHS 200 Digital Overhead Stirrer

Overhead Stirrer with 200 Ncm torque, double speed gear, digital display and timer able to stir up to 100  l.
OHS 200 Digital F20100490
OHS 200 Digital F20110490

Safety and resistance for your lab

Safety and resistance for your lab
OHS 200 Digital is designed to guarantee the highest safety standards. The resistant sealed housing and the IP 54 Protection Rating guarantee durability even in the most aggressive environments.
  • Integrated overload, overtemperature, and overcurrent safety alarms will preserve the performance over time and stop stirring for maximum safety in your lab. 
  • Safe start and stop knob operation and lock key avoid unintended stat up and changes of the working conditions. 

OHS 200 Digital ensures continuous operation and is backed by 3 Years Warranty extension.

Best-in-class Stirring Power

Best-in-class Stirring Power
The OHS 200 Digital is the ideal solution for demanding applications operating with viscosities up to 100.000 mPa.  
The electronic controlled brushless motor of the OHS 200 Digital stirs up to 100 l  with a maximum torque of 200 Ncm, and ensures the longest lifespan. 

SpeedServoTM torque compensation technology keeps the speed constant automatically adjusting to viscosity changes. 

Thanks to the two-speed gears it provides the best performance for both high torque and high volume operations:
  • Speed gear 1: 6-400 rpm
  • Speed gear 2: 30-2000 rpm 

Constant torque at any speed

Constant torque at any speed
The brushless motor and the microprocessor guarantee excellent performance marking the difference between a conventional overhead and the VELP OHS Series.

The torque is stable throughout the whole speed range, ensuring stirring at maximum torque even at the highest speed.

This is a very important parameter for the reproducibility of your tests.

SmartChuck™ simplifies shaft accommodation

SmartChuck™  simplifies shaft accommodation
The OHS Digital SmartChuck™ technology simplifies the shaft accommodation process that can be carried out even with one hand and does not require any tool, making your life easier.

With two simple operations, you can unlock the protection ring to drive the shaft in and out with maximum ease.

The opening of the ring during the stirring process will automatically block the analysis and the instrument informs you for maximum safety.

Easy-to-use and precise

Easy-to-use and precise
All the necessary information are available at a glance and the dedicated Torque Display with 4 LED segments informs about viscosity changes during the operation.

The OHS Digital integrated timer allows unattended operations. Program your OHS Digital from 1min to 99.59h and walk away! 

USB interface facilitates software updates if required. 


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Choose the right stirring shaft for your application!

Choose the right stirring shaft for your application!
Overhead stirrers require stirring shaft for precise working. Choosing the correct stirring shaft is an important step to obtain the best stirring performance. 

It is important to evaluate the characteristics and the effects on the fluid of the stirring shaft, together with the volume and viscosity: 
  • Desired type of flow: Axial, Tangential, Radial; 
  • Speed range of your application 
Contact a VELP Specialist that will guide you to choose the correct shaft for your sample and application! 
Stirring Shaft Comparison

VELP H-Stand ensure stability and resistance for lab bench OHS application

VELP H-Stand ensure stability and resistance for lab bench OHS application
VELP H-Stands are the ideal solution when the overhead stirrer is working on laboratory benches. 

We have designed our H-Stand to guarantee the maximum stability thanks to the H-shape of the base and the maximum resistance choosing premium materials such as aluminum and stainless steel, properly treated in order to resist to chemicals and corrosion. 

The Telescopic H-Stand facilitates the daily operations being easy-to-use when raising and lowering the overhead stirrer from your sample. 

Safety first with the new Chuck Guard

Safety first with the new Chuck Guard
Chuck Guard is the new protective accessory for OHS Overhead Stirrers. The guard helps to protect operators from contact with the upper part of the chuck and prevents potential entanglement with the rotating shafts.

Chuck Guard is built with top quality material, ensuring resistance and excellent visibility.
  • Easy-to-use: just fix the support plate using two screws
  • Robust construction
  • Light weight


DisplayDigital Display
User InterfaceDigital
MotorBrushless DC
Stirring Volume (H2O)Up to 100 L
Speed Gears2
Max Torque200 Ncm
Stirring Speed Range6-400 rpm
30-2000 rpm
Speed Accuracy1 rpm
Speed ControlDigital
Max Viscosity100.000 mPa*s
Torque CompensationSpeedServo™
Chuck Range Ø from 1 to 13 mm
Shaft diamater Pass-Throughup to 8.5mm
Lock of the instrumentYes
Dimensions (WxHxD)90x315x235 mm
(3.5x12.4x9.3 in)
Weight4,6 kg
(10,1 lb)
Protection Class DIN EN 60529IP 54

Brochures & Leaflets

VELP Scientifica invites you to download brochures and leaflets in order to explore our premium quality solutions and to have all the major key arguments, features and specifications of a product in your hands, in any place, and at any time.

Instruction manuals

Download the instruction manual that contains all the main technical specifications of the instrument and the necessary information for its correct use.

Comparison tables

Select the category of products you are interested in and this tool will give you an easy overview of what is available at VELP in order to find the product that is perfect for you. These comparison tables provide a brief description with side by side features from basic equipment to the most advanced analytical solutions.


Our compliance to statutory rules and regulations worldwide.
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety.
The Certification Body (CB) Certificate is an international program created by the IECEE for the acceptance of product safety test results among participating laboratories and certification organizations around the world.
The cNEMKOus mark ensures this product is designed and manufactured in compliance with the International Directive on Safety IEC/EN 61010-1. The cNEMKOus mark has the same legal status as any other NRTL/SCC accredited marks, for U.S. and Canada.


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