Premium Lab & Industrial Agitators – Overhead Stirrers | 1 L–500 L | Absolute Control & Corrosion Resistance

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Premium Lab Stirrer & Industrial Agitators – Overhead & Magnetic Stirrers | 20 L–500 L

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“Discover Aarohi Scientific’s overhead stirrers and magnetic agitators—precision-engineered for chemical, pharmaceutical, and pilot-plant applications. Available in glass, PTFE-lined, and stainless steel, our systems offer unmatched flexibility, corrosion resistance, and high torque control.”

overhead stirrer

Aarohi Scientific offers a full range of high-precision laboratory stirrers and industrial agitator drives designed for use with glass reactors and process vessels ranging from 1L to 500L. Our overhead stirrers, magnetic stirrers, and PTFE-lined drives are engineered to meet the demanding requirements of chemical processing, R&D, and pharma applications. Whether you require gentle mixing or high-torque agitation, our solutions deliver performance, reliability, and chemical resistance. Our modular, corrosion-resistant agitator systems offer unmatched flexibility, safety, and automation, ensuring superior results whether you’re operating at bench scale or kilo-scale.

 

Standard Models & Dimensions

Vessel Volume (L) (A) (B) (C) (D)
20 L825 mm250 mm150 mm450 mm25 mm
50 L1050 mm300 mm200mm600 mm50 mm
100 L1200 mm300 mm250 mm700 mm50 mm
200 L1450 mm300 mm300 mm900 mm50 mm
300 L1275 mm300 mm25 mm1000 mm50 mm
Agitator Stirrer Shaft

Other sizes available up to 500 L on request.

Download Catalogue

Chuck and Seal Assembly for Glass Reactors

Our Chuck and Seal Assembly is designed for leak-proof stirring in glass process reactors under vacuum or pressure conditions, even in highly corrosive environments. Only PTFE and Borosilicate Glass are exposed to process fluids, ensuring full chemical resistance — ideal for pharmaceutical, specialty chemical, and bulk drug manufacturing.

Bellow seal can be used under vacuum down to 10mm Hg absolute. Mechanical seal can be use under vacuum 1mm Hg absolute or under pressure permitted into glass vessels. A reducer adapter is generally required to connect the chuck and seal unit to the top flange or neck of the glass reactor. This ensures proper alignment and secure mounting of the stirring shaft with the drive system.

Cat.Ref. Bellow Seal
Cat.Ref. Mechanical Seal
Vessel
DN
L
CSA1
CSM1
20 L
50
300
CSA1.5
CSM1.5
50L, 100L, 200 L
80
360

STIRRER WITH TEFLON BLADES

These stirrers are used with liquid of low viscosity.

Cat.Ref.
Vessel
L
L1
L2
L3
d
D
STB10
10
600
300
15
175
25
100
STB20
20
825
300
25
200
25
100
STB50
50
1050
300
25
200
47
150
STB100
100
1200
300
30
250
47
175
STB200
200
1450
300
30
325
47
200
STB300
300
1550
350
30
425
59
275

Stirrer with Teflon Blades

VORTEX STIRRER

These stirrers are used with liquid of low viscosity containing small solid particles.

Cat.Ref.
Vessel
L
L1
L2
d
STV50
50
1050
300
50
47
STV100
100
1200
300
65
47
STV200
200
1450
300
65
47

Vortex Stirrer

PROPELLER STIRRER

These stirrers are used with liquid of high viscosity or liquid with big solid particles.

Cat.Ref.
Vessel
L
L1
L2
d
STP50
50
1050
300
50
47
STP100
100
1200
300
65
47
STP200
200
1450
300
65
47

Propeller Stirrer

STIRRING ASSEMBLY WITH MECHANICAL SEAL

This stirrer assembly is designed for easy and secure installation on glass process vessels. It includes a glass stirrer, mechanical seal with chuck, and an appropriate reducer to ensure perfect alignment and leak-proof operation.

The complete assembly consists of:

a. Glass Stirrer
Type: STB / STV / STP — depending on the process requirement (anchor, turbine, or propeller type)

b. Chuck with Mechanical Seal
Model: CSM — provides a tight seal for vacuum or pressure conditions while allowing smooth rotation

c. Reducer
Model: PR — used to connect the seal and chuck assembly to the top neck or flange of the reactor

This modular setup is ideal for use in chemical processing, R&D, and pilot plant operations, offering excellent chemical resistance, easy assembly, and compatibility with various vessel configurations.Pilot Plant Stirrer

Cat. Ref.
For Vessel
Stirrer
Chuck & Seal
Glass Reducer
STBM20
20L
STB20
CSA1
PR4/2
STBM50
50L
STB50
CSA1.5
PR6/3
STBM100
100L
STB100
CSA1.5
PR9/3
STBM200
200L
STB200
CSA1.5
PR12/3
STBM300
300L
STB300
CSA2
PR16/4
STVM50
50L
STV50
CSA1.5
PR6/3
STVM100
100L
STV100
CSA1.5
PR9/3
STVM200
200L
STV200
CSA1.5
PR12/3
STVM300
300L
STV300
CSA2
PR16/4
STPM50
50L
STP50
CSA1.5
PR6/3
STPM100
100L
STP100
CSA1.5
PR9/3
STPM200
200L
STP200
CSA1.5
PR12/3
STPM300
300L
STP300
CSA2
PR16/4

SS PTFE LINED STIRRER ASSEMBLY

SS PTFE Lined Stirrer Assembly

Cat. Ref.
For Vessel
Stirrer
Chuck & Seal
Glass Reducer
STBM20/P
20L
SS PTFE LINED
CSA1
PR4/2
STBM50/P
50L
SS PTFE LINED
CSA1.5
PR6/3
STBM100/P
100L
SS PTFE LINED
CSA1.5
PR9/3
STBM200/P
200L
SS PTFE LINED
CSA1.5
PR12/3
STBM300/P
300L
SS PTFE LINED
CSA2
PR16/4
STVM50/P
50L
SS PTFE LINED
CSA1.5
PR6/3
STVM100/P
100L
SS PTFE LINED
CSA1.5
PR9/3
STVM200/P
200L
SS PTFE LINED
CSA1.5
PR12/3
STVM300/P
300L
SS PTFE LINED
CSA2
PR16/4
STPM50/P
50L
SS PTFE LINED
CSA1.5
PR6/3
STPM100/P
100L
SS PTFE LINED
CSA1.5
PR9/3
STPM200/P
200L
SS PTFE LINED
CSA1.5
PR12/3
STPM300/P
300L
SS PTFE LINED
CSA2
PR16/4

FLAMEROOF AGITATOR DRIVE

Agitator Drive

A 1400 RPM 3 Phase flameproof motor coupled with reduction gear is supplied along with a flexible shaft. Motor is mounted on a metal base frame, which is designed to install easily with a Glass Assembly.

Cat.Ref.
HP
RPM
FSD 0.5
0.5
192
FSD 1
1
192

VARIABLE FREQUENCY DRIVE (VFD)

VARRIABLE FREQUENCY DRIVER (VFD)

3 Phase non-flameproof regulators and Flameproof VFD Type regulator are available to control the speed of stirrer drives.

Cat.Ref.
Phase
Type
VFD 0.5
3
VFD

EXPLOSION PROOF STIRRER DRIVE

Explosion Proof Stirrer Drive

We also offer Ex certified motor coupled with bonfiglioli gearbox for better safety and performance.

Cat.Ref.
HP
RPM
FSD 0.5/ Ex
0.5
192

🔍 Key Features

  • 3 Material Options: Borosilicate glass, Stainless Steel (SS 316L), or PTFE-lined for maximum corrosion resistance.

  • 5 Stirrer Styles:

    • Impeller-blade (turbo/marine) for low-viscosity fluids

    • Vortex stirrer for slurries and particle suspensions

    • Propeller stirrer for high-viscosity liquids

    • Anchor stirrer for gentle, viscous mixing

    • Paddle stirrer for paste-like media

  • 2 Drive Options: Flameproof and non-flameproof motors at 192 RPM, with Variable Frequency Drive (VFD) from 50–192 RPM.

  • 2 Sealing Technologies: Bellow seals (vacuum to 10 mm Hg) or mechanical seals (vacuum to 1 mm Hg or pressurized).

  • Quick Assembly: Easy installation via chuck, seal, and reducer set—ensuring leak-free performance.

Stirring Assemblies by Application

Impeller Stirrer (Glass/PTFE/SS) for low viscosity liquids:

  • Perfect for water-like fluids and gentle mixing.

  • Available in PTFE or glass-bladed models (STB series).

Vortex Stirrer for slurries & solids:

  • Robust design for suspending small solids without damaging blades (STV series).

Propeller Stirrer for higher viscosity fluids:

  • Efficient for mixing viscous media, ideal for pigment dispersion and emulsions (STP series).

Anchor & Paddle Stirrers available via custom request—ideal for pastes or high-viscosity materials.

Sealing & Agitator Drive Units

  • Bellow Seal Assembly (CSA models): Ideal for vacuum operation down to 10 mm Hg; only glass/PTFE contacts process fluid.

  • Mechanical Seal Assembly (CSM models): Full vacuum (1 mm Hg) or pressurized applications within vessel limits.

  • Reducers (PR) connect seal-to-chuck configurations and match vessel neck sizes.

Agitator Drive Motor Options:

  • Non-flameproof motor (0.5 HP, 192 RPM)

  • Flameproof motor with gearbox (0.5 HP, 192 RPM) — suitable for hazardous environments.

  • VFD Controllers (VFD 0.5, VFD3): Provide precise speed control and torque management.

Advanced Benefits

  • Corrosion Resistance: Designed for aggressive chemicals—glass and PTFE wetted surfaces eliminate contamination issues.

  • Versatility: One drive system supports multiple vessel sizes via modular chuck & reducer sets.

  • Safety & Compliance: Explosion-rated drives and ATEX-ready options ensure compliance with safety standards.

  • Precision Mixing: Select stirrer type to match fluid viscosity and process requirements.

  • Easy Maintenance: Modular components—seals, blades, and motors—can be replaced quickly with minimal downtime.

Typical Industries & Use Cases

  • Chemical Synthesis – Precise reaction control in glass reactor systems

  • Pharmaceutical Production – API suspension and crystallization processes

  • Biotechnology – Cell culture and fermentation mixing

  • Pilot Plants & R&D – Flexible agitation for versatile experimental setups

  • Specialty Chemicals – Viscous slurry mixing and emulsification processes

Custom Configuration Support

Need something tailored? We can assemble agitator systems to your exact requirements:

  1. Choose Vessel Volume – 20 L to 500 L

  2. Select Stirrer Type – Impeller / Vortex / Propeller / Anchor / Paddle

  3. Pick Wetted Material – Glass / PTFE / Stainless Steel

  4. Seal Selection – Bellow, Mechanical, or PTFE-lined

  5. Drive Preference – Non-flameproof or Flameproof + VFD

  6. Additional Options – Explosion-proof motor, ATEX compliance, stainless steel bearing stands

📞 Ask for a FREE CONFIGURATION CONSULTATION to optimize your mixer for fluid characteristics and production targets.

Installation, Support & Documentation

  • Step-by-Step Assembly Guides

  • Performance Test Data and Compliance Certificates

  • Spare Part Availability and Global Support Network

  • Training & Calibration services upon request

FAQs

Q1: What is an overhead stirrer used for?
A: Overhead stirrers are ideal for high-viscosity liquids and large volume mixing in reactors.

Q2: What is the difference between magnetic and overhead stirrers?
A: Magnetic stirrers are best for small volumes and gentle mixing. Overhead stirrers handle higher torque and are better for viscous or reactive fluids.

Q3: Are your stirrers compatible with PTFE-lined vessels?
A: Yes, we offer fully compatible stirrers and sealing assemblies for PTFE-lined systems.

Why Choose Aarohi Scientific?

  • In-house design and precision fabrication

  • Wide range from 1L to 500L

  • Custom configurations and motor options

  • Reliable after-sales support

Contact Us Today!
Looking for the right stirring solution for your lab or pilot plant? Get in touch with our team to receive expert assistance and a quick quotation.