The Yamato LR-500BA is the complete-set configuration of the LR-500B overhead stirrer, the LR-500B digital main body plus the stand and rod needed to mount and run it, packaged together. It is the same higher-speed, medium-viscosity overhead stirrer (gearless direct-drive, 100–1000 rpm, 0.98 N·m / 10 kgf·cm, 100 W brushless motor) delivered ready to operate rather than as a bare main body. The $315 premium over the LR-500B main body is the added stand and rod.
Key Specifications
| SKU | LR-500BA |
| Type | Overhead (top-drive) digital laboratory stirrer: complete set (main body + stand + rod) |
| Speed range | 100–1000 rpm (no load) |
| Max torque | 0.98 N·m (10 kgf·cm) |
| Motor | Brushless DC, 100 W |
| Drive | Gearless direct-drive |
| Shaft diameter | ø10 mm |
| Speed control | Speed feedback control (holds set rate under changing load) |
| Display | Digital 3-digit speed / green-LED torque, 2 steps + overload display |
| Safety | Stops automatically when overloaded |
| Power source | AC 100–125V, 3.5A, 50/60 Hz |
| Included | LR-500B main body, stand, rod, stainless-steel stirring shaft (ø10 x 500 mm), 75 mm 4-blade propeller, clamp |
| Main-body-only SKU | LR-500B ($1,886.50) |
| Speed twin (set) | LR-500AA (34–340 rpm, 1.96 N·m) |
| List price | $3,145.00 |
Author confidence note: the stirrer specifications are fully itemized in the LT/LR brochure. The stand and rod are listed there generically as an "operational accessory" without a dimensioned part number in this brochure. Confirm exact stand/rod specification with Yamato at order.
Application Profile
- Medium-viscosity mixing at speed. Solutions and suspensions needing faster blending than the high-torque LR-500A/AA provides.
- Turn-key overhead stirring. Arrives mounted-ready with stand and rod, so no separate stand purchase is needed.
- Overhead stirring of large / open vessels. Top-driven stirring for volumes and geometries a magnetic stir bar cannot serve.
- Homogenization, dispersion and blending. Higher-rpm shear for emulsions, dispersions and dissolutions.
Overhead vs magnetic: when to pick the LR-500BA: choose an overhead set when the sample is too viscous or the vessel too large for a magnetic stir bar, and you want a complete stand-mounted rig out of the box. Within the LR-500 sets the LR-500BA is the higher-speed / lower-torque option; step to the LR-500AA when the sample demands 1.96 N·m at low speed.
Design Architecture
The LR-500BA is the LR-500B drivetrain on a stand. A 100 W brushless DC motor turns the ø10 mm shaft directly (gearless direct-drive) at 100–1000 rpm, delivering 0.98 N·m to the sample with no gear noise or gear wear. The brochure notes the brushless motor's safety advantage, no brushes, no sparks, no brush replacement.
Speed feedback control holds the set rate despite viscosity changes mid-stir. Load appears on a green-LED two-step + overload torque display beside a 3-digit tachometer; exceeding maximum load lights the overload lamp and stops the motor automatically. The included stand and rod provide the mounting the bare main body lacks. At 3.5A the LR-500BA draws slightly more than the LR-500AA, consistent with its higher-power motor.
Frequently Asked Questions
What does the LR-500BA complete set include? The LR-500B digital main body plus the stand, rod, stainless-steel stirring shaft (ø10 × 500 mm), 75 mm 4-blade propeller, and clamp, ready to run.
What speed and torque does it deliver? 100–1000 rpm at 0.98 N·m (10 kgf·cm) from a 100 W gearless direct-drive brushless motor with speed feedback control.
How is the LR-500BA different from the LR-500B? Same drivetrain; the LR-500BA adds the stand and rod (a $315 premium over the LR-500B main body).
When should I choose the LR-500AA instead? Choose the LR-500AA (34–340 rpm, 1.96 N·m) when the sample needs higher torque at lower speed; the LR-500BA is the higher-speed / lower-torque option.
What voltage does it use? AC 100–125V, 3.5A, 50/60 Hz.
Ordering & Configuration
In the box: LR-500B main body, stand, rod, stainless-steel stirring shaft (ø10 x 500 mm), 75 mm 4-blade propeller, and clamp, a complete stand-mounted stirring rig.
Optional accessories: propellers in various types/sizes, vacuum adapter, extra-long stirring shaft (ø10 x 800 mm), glass stirring shaft.
At $3,145.00 the LR-500BA is quoted rather than added directly to cart. Confirm at quote:
- Set vs main body. LR-500BA (this SKU, includes stand + rod) vs LR-500B main body ($1,886.50) if a stand already exists.
- Speed/viscosity fit. 100–1000 rpm / 0.98 N·m (this set) vs LR-500AA's 34–340 rpm / 1.96 N·m.
- Shaft, propeller and stand. Confirm the exact stand/rod specification and any long-shaft / alternate-propeller needs.
Warranty: per Yamato standard terms. Confirm at quote.
LR-500 family: LR-500BA (100–1000 rpm set, this product) · LR-500AA (34–340 rpm set) · LR-500A / LR-500B (main bodies only).
