The BOS-100 is a Yamato synthetic-chemistry oil bath with a solid stainless-steel bath chosen for good temperature stability and durability. Sized at the 1 L class (φ140 × 100 mm internal bath) with a remote PID controller operable at a distance, it heats round-bottom flasks for synthesis, distillation, and rotary-evaporation to a 250 °C ceiling. This is the 115V variant; the 220V sibling is the BOS-110, and the glass-bath equivalent (for visibility) is the BOG-100.
Key Specifications
| SKU | BOS-100 |
| Type | Oil bath, stainless steel, remote PID controller |
| Bath capacity | Recommended (no load) ~0.8 L; maximum ~1.0 L |
| Internal bath dimensions | φ140 × 100 mm |
| Temperature control range | Room temp. +5 °C to 250 °C |
| Temperature setting range | 0 °C to 260 °C |
| Temperature accuracy | ±0.3 °C (at 200 °C, when stirring) |
| Control system | PID control, Pt100Ω sensor, digital ▲▼ set (1 °C units) |
| Heater | Stainless-steel tube heater, 310 W |
| External dimensions | φ155 × 210 × 140 mm (bath); controller 150 × 90 × 45 mm |
| Weight | ~3.0 kg total (bath + heater + controller) |
| Voltage / power | 115V, 50/60 Hz, 3.5 A (220V sibling = BOS-110) |
Application Profile
The 1 L stainless oil bath targets flask-scale synthetic and distillation chemistry where temperature stability and durability matter:
- Round-bottom flask heating in organic synthesis and reflux
- Rotary-evaporation and distillation heat sources requiring stable oil temperatures to 250 °C
- Reactions above the water-bath ceiling. Oil enables set points well past 100 °C
- Stirred reactions. The bottom indent seats a magnetic-stirrer hot plate (compatible with Yamato MFD800/MFH800), and a PTFE stirrer and arbor ship with the unit
- Demanding or long-run heating where a rugged solid-stainless bath is preferred over glass
Choose the stainless BOS bath when temperature stability and durability are the priority (250 °C ceiling); choose the glass BOG bath when visibility of the flask and oil level is more important.
Design Architecture
A remote PID controller (150 × 90 × 45 mm) drives a 310 W stainless-steel tube heater via triac zero-cross switching, holding ±0.3 °C at 200 °C when stirring with a Pt100Ω sensor. Separating the controller from the hot bath lets the operator set and read temperature safely at a distance. An indent at the bath bottom integrates a magnetic-stirrer hot plate and prevents the bath from sliding. Optionally, a flask-inserted sensor pairs with the in-tank sensor for tighter control at the reaction site, and a triple-system configuration is available. Safety layers include self-diagnostic sensor-error detection, automatic overheat prevention, an independent overheat prevention device, a heater guard, and a 6.3 A short-circuit/overcurrent fuse.
Frequently Asked Questions
What temperature range does the BOS-100 reach? Its temperature control range is room temp +5 °C to 250 °C (setting range 0 °C to 260 °C), with ±0.3 °C accuracy at 200 °C when stirring.
What is the bath capacity of the BOS-100? The 1 L class bath (φ140 × 100 mm internal) takes a recommended no-load fill of ~0.8 L and a maximum of ~1.0 L.
Is oil included with the BOS-100? No. Oil is not included. Add ~0.8 L (max ~1.0 L) of a suitable heat-transfer/silicone oil for your target set point separately.
Is the BOS-100 available in 220V or as a glass bath? The BOS-100 is the 115V stainless variant; order the BOS-110 for 220V. For a glass bath at the same 1 L class (for visibility), choose the BOG-100 (115V) / BOG-110 (220V).
Can I add the BOS-100 to cart directly? Yes. It is a catalog-priced item with no quote gate. Confirm voltage at checkout.
Ordering & Configuration
In the box: heater guard (1 set), arbor (φ12 × 90 mm, 1), PTFE stirrer (~φ8 × 50 mm, 1), connector cap (1), and tag-attached cable ties (3).
Add oil separately. The recommended fill is ~0.8 L (max ~1.0 L) of a suitable heat-transfer/silicone oil for the target set point. Oil is not included.
Confirm voltage. BOS-100 is 115V; order BOS-110 for 220V. For a glass bath (visibility) at the same 1 L class, choose BOG-100 (115V) / BOG-110 (220V).
Catalog-priced; no quote gate. Confirm voltage at checkout.
Warranty: Per Yamato standard terms.
Yamato BOG/BOS oil bath family:
- BOG-100 / -110, 1 L glass · BOG-200 / -210, 2.2 L glass
- BOS-100 (this product): 1 L stainless, 115V · BOS-110, 1 L stainless, 220V
- BOS-200 / -210: 2.2 L stainless (115V / 220V)
