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).
