The BOS-210 is the larger 2.2 L member of Yamato's BOS stainless oil-bath line, a solid stainless-steel bath chosen for good temperature stability and durability, with a remote PID controller for safe hands-off operation. The bigger φ170 × 140 mm bath and 425 W heater heat larger flasks to a 250 °C ceiling in synthetic, distillation, and rotary-evaporation work. This is the 220V variant; the 115V sibling is the BOS-200, and the glass-bath equivalent (for visibility) is the BOG-210.
Key Specifications
| SKU | BOS-210 |
| Type | Oil bath, stainless steel, remote PID controller |
| Bath capacity | Recommended (no load) ~1.7 L; maximum ~2.2 L |
| Internal bath dimensions | φ170 × 140 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, 425 W |
| External dimensions | φ185 × 240 × 180 mm (bath); controller 150 × 90 × 45 mm |
| Weight | ~3.4 kg total (bath + heater + controller) |
| Voltage / power | 220V, 50/60 Hz, 2.5 A (115V sibling = BOS-200) |
Application Profile
The 2.2 L stainless oil bath targets larger flask-scale synthetic and distillation chemistry where temperature stability and durability matter:
- Larger 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 425 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 is the BOS-210's bath capacity? Recommended ~1.7 L (no load), maximum ~2.2 L, in a φ170 × 140 mm solid stainless-steel bath.
What temperature can the BOS-210 reach? A control range of room temperature +5 °C to 250 °C, held to ±0.3 °C at 200 °C when stirring.
Why choose the stainless BOS over the glass BOG bath? The solid stainless bath is chosen for temperature stability and durability and reaches a 250 °C ceiling; choose the glass BOG-210 when visibility of the flask and oil level is the priority.
Is oil included? No. Fill to ~1.7 L (max ~2.2 L) with a suitable heat-transfer/silicone oil for your target set point. Oil is sold separately.
What voltage is the BOS-210, and what is the other option? This is the 220V variant; order the BOS-200 for 115V.
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 ~1.7 L (max ~2.2 L) of a suitable heat-transfer/silicone oil for the target set point. Oil is not included.
Confirm voltage. BOS-210 is 220V; order BOS-200 for 115V. For a glass bath (visibility) at the same 2.2 L class, choose BOG-210 (220V) / BOG-200 (115V).
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 / -110: 1 L stainless
- BOS-200 (2.2 L stainless, 115V · BOS-210 (this product)) 2.2 L stainless, 220V
