The BO-312A is Yamato's economy constant-temperature oil bath — a 5 L flat-bottomed bath (φ240 mm ID) with no heater or sensor inside the reservoir, making it easy to clean. Designed primarily as a rotary-evaporation heat source (compatible with Yamato RE202-A/212-A and REV-202M-A/212M-A evaporators), it delivers digital PID control to a 180 °C ceiling. This is the 200-230V variant; the 100-115V sibling is the BO-302A.
Key Specifications
| SKU | BO-312A |
| Type | Economy constant-temperature oil bath, flat-bottom, digital PID |
| Reservoir capacity | ~5 L (φ240 mm ID) |
| Temperature control range | Room temp. +10 °C to 180 °C |
| Temperature accuracy | ±2.0 °C |
| Control system | PID control, Pt100Ω sensor, white LED digital display (1 °C min. digit) |
| Heater | 1000 W aluminum sheathed heater |
| Bath reservoir | Stainless steel (flat-shaped, no internal heater/sensor) |
| Exterior | PBT (fiber-glass reinforced) |
| External dimensions | φ262 mm (max. D286) × H240 mm |
| Weight | ~4.5 kg |
| Service outlet | 2 A |
| Voltage / power | 200-230V, 5-6 A, 10 A fuse (100-115V sibling = BO-302A) |
Application Profile
The 5 L flat-bottom oil bath is built as a clean, high-capacity heat source for evaporation and constant-temperature work:
- Rotary-evaporation heat source — matched to Yamato RE202-A/212-A and REV-202M-A/212M-A rotary evaporators
- Constant-temperature oil heating to 180 °C for synthesis and sample conditioning
- Reactions above the water-bath ceiling — oil enables set points past 100 °C
- Wide, shallow flask immersion — the large φ240 mm bath accepts large evaporation flasks
- Workflows needing easy cleanup — the flat interior with no submerged heater or sensor wipes out cleanly
At ±2.0 °C control the BO-312A targets broad, stable heating rather than tight-uniformity metrology; for tighter control choose the BOG/BOS remote-controller series.
Design Architecture
A 1000 W aluminum-sheathed heater and Pt100Ω sensor sit outside the reservoir, driving PID control with a white LED digital display (1 °C minimum digit). Keeping heater and sensor out of the bath is what makes the flat stainless reservoir easy to clean. The PBT (fiber-glass) exterior resists heat and solvents. A built-in 2 A service outlet powers an attached rotary evaporator, and the unit resumes automatically after a power interruption. Safety layers include automatic overheat prevention, an independent overheat prevention device (fixed-temperature type), a temperature upper-limit error alarm, an overshoot alert, and an overcurrent-protection fuse.
Frequently Asked Questions
What is the reservoir capacity of the BO-312A? About 5 L, in a flat-bottomed stainless reservoir (φ240 mm inner diameter) with no heater or sensor inside the bath for easy cleaning.
What temperature range does it reach? Room temperature +10°C to 180°C, with ±2.0°C accuracy under PID control and a white LED digital display.
What is the BO-312A designed to be used with? Primarily as a rotary-evaporation heat source, compatible with Yamato RE202-A/212-A and REV-202M-A/212M-A rotary evaporators; a built-in 2A service outlet powers the attached evaporator.
Is oil included? No. Fill to about 5 L with a suitable heat-transfer or silicone oil for the target set point — oil is not supplied.
What voltage does it require? 200-230V, 5-6A, with a 10A fuse. The 100-115V sibling is the BO-302A.
Ordering & Configuration
In the box: 3 m power cable with inlet plug, and spare 10 A main-power fuse (large).
Add oil separately. Fill to ~5 L with a suitable heat-transfer/silicone oil for the target set point — oil is not included.
Confirm voltage. BO-312A covers the 200-230V range (choose a suitable power plug); order BO-302A for 100-115V. Note: at low ambient temperature or if source voltage falls below ~190 V, the maximum temperature may not be reached.
Optional accessory: BC102 Bath Protection Cover.
Catalog-priced; no quote gate. Confirm voltage at checkout.
Warranty: Per Yamato standard terms.
Yamato BO-302A/312A oil bath:
- BO-302A — 5 L, 100-115V
- BO-312A (this product) — 5 L, 200-230V
