Surge Scientific · Model OHS-60D
Overhead Laboratory Stirrer
60 Liter · 60 N·cm Torque
Brushless DC Motor · 50–2000 RPM · Dual Viscosity Rating · 160 W Output · ±1% Speed Accuracy
The OHS-60D is the top of the Surge Scientific stirrer range — 60 liters of usable batch volume, 60 N·cm of shaft torque, and a dual viscosity rating that tops out at 10,000 mPa·s for slow, high-shear work on heavy dispersions. When a reaction thickens to resin, paste, or slurry and a smaller unit would stall, the OHS-60D's 160 W brushless drive holds your setpoint and keeps turning.
Why a Dual Viscosity Rating Matters
Large-format stirrers force a real-world compromise buyers rarely see in the spec sheet: at high RPM, a motor can move thin fluids fast but gives up on thick ones. At low RPM, it can develop massive torque on thick fluids but can't generate vortex speed in thin ones. Single-rating units hide this trade-off behind one optimistic number — usually the thin-fluid one.
The OHS-60D is rated honestly at both ends of its operating window: 5,000 mPa·s at 2000 RPM for fast mixing of moderately viscous batches, and 10,000 mPa·s at 1000 RPM for slow, sustained torque into heavy resins, polymers, and high-solids dispersions. You pick the operating point; the controller delivers.
60 N·cm Shaft Torque
Rated for 60 liters of batch volume with viscosity headroom up to 10,000 mPa·s at 1000 RPM — the working range of resin synthesis, heavy slurries, and pilot-scale dispersions.
160 W Output Power
The largest motor in the Surge overhead range, driving through a brushless DC controller with no brushes to wear and no carbon dust to contaminate sensitive samples.
Triple-Layer Safety
Proprietary torque-overload cutoff, independent over-temperature protection, and dedicated motor protection — with four audible fault codes for instant diagnosis.
±1% Speed Accuracy
Closed-loop control holds 50–2000 RPM in stepless 10 RPM steps. The LED display alternates set and actual speed so you see the controller working under real load.
"10,000 mPa·s at 1000 RPM. 5,000 mPa·s at 2000 RPM." — A dual-rating stirrer built for the reality of viscous mixing — sustained torque at low speed, clean vortex at high speed, held to ±1% across both.
Key Features
- Max torque 60 N·cm at the shaft
- Max batch volume 60 L (water)
- Max viscosity 10,000 mPa·s @ 1000 RPM
- Max viscosity 5,000 mPa·s @ 2000 RPM
- Max output power 160 W
- Speed range 50–2000 RPM
- Stepless 10 RPM increment
- ±1% speed accuracy (closed loop)
- Bright LED display — set and actual speed alternating
- Maintenance-free brushless DC motor
- Through-shaft housing — adjustable impeller height
- 0.5–10 mm keyed clamping chuck
- Overload torque cutoff circuit
- Independent over-temperature protection
- Dedicated motor protection circuit
- Four fault codes with audible alarm
- Large knob — push to start / stop, turn to set speed
- IP42 dust and splash protection per DIN EN 60529
- Dual voltage: 100–240V, 50/60 Hz
- Compact 71 × 174 × 240 mm drive head
- 2.5 kg head weight — easy to reposition
- Factory-tested before shipment
Ideal Applications
Resin & Polymer Synthesis
Crosslinking reactions, resin blending, and thermoset development where viscosity climbs into the 10,000 mPa·s range mid-run.
High-Solids Dispersions
Paint, ink, adhesive, and coating formulation — large batches with heavy filler loadings that stall smaller drives.
Pilot & Process Development
Pilot-plant work, process-scale QC, and production-support mixing at volumes where benchtop stirrers run out of headroom.
What's in the Box
Every OHS-60D ships with the components needed to begin stirring — support stand, extension arm, chuck, and drive head. Impellers are sold separately to match your sample's viscosity and geometry.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model / SKU | OHS-60D |
| Max Torque at Shaft | 60 N·cm |
| Max Stirring Quantity | 60 L (H₂O) |
| Max Viscosity @ 2000 RPM | 5,000 mPa·s |
| Max Viscosity @ 1000 RPM | 10,000 mPa·s |
| Speed Range (Normal Load) | 0 / 50–2000 RPM |
| Speed Increment | Stepless, 10 RPM |
| Speed Accuracy | ±1% |
| Motor Type | Brushless DC, maintenance-free |
| Max Output Power | 160 W |
| Rated Power | 65 W |
| Display | LED — set / actual speed alternating |
| Clamping Chuck Range | 0.5–10 mm |
| Overload Protection | Yes |
| Motor Protection | Yes |
| Over-Temperature Protection | Yes |
| Ingress Protection | IP42 (per DIN EN 60529) |
| Permissible Ambient Temp | 5–40°C |
| Permissible Relative Humidity | ≤ 80% |
| Voltage / Frequency | 100–240V, 50/60 Hz |
| Dimensions (D × W × H) | 71 × 174 × 240 mm (without extension arm) |
| Weight | 2.5 kg (with extension arm and chuck) |
Surge Scientific Warranty & Support
This instrument is sold through Surge Scientific, your trusted laboratory equipment partner. Our product specialists are available Monday–Friday for assistance. The OHS-60D is backed by a 2-year all-inclusive manufacturer's warranty. Contact us at info@surgescientific.com or reach out directly to our support team at 855.943.3344 for pre-sales questions, impeller selection, quotes, and technical assistance.