The Yamato BM-302A is a ~5 L digital water bath with PID temperature control and a white LED display, operating from room temperature +10 °C to 90 °C at ±1 °C. The Yamato BM-302A uses a flat-shaped bath with no heater or sensor inside the reservoir, so the tank wipes clean easily, and a 1000 W aluminum sheathed heater with a Pt100Ω sensor delivers stable, accurate sub-boiling temperatures. It is a compact, precise benchtop bath for reagent and sample warming, thawing, and constant-temperature incubation. It is the 100–115 V unit; the 200–230 V sibling is the BM-312-A.
Key Specifications
| Spec | Value |
| Model (focus) | Yamato BM-302A (BM-series, 5 L digital) |
| Type | Digital water bath, PID control |
| Bath capacity | ~5 L |
| Operating temperature range | Room temperature +10 °C to 90 °C |
| Temp. adjustment accuracy | ±1 °C |
| Control system | PID control by microprocessor |
| Setting / display | White LED digital display, ▲/▼ key entry, 1 °C min. digit |
| Heater | 1000 W aluminum sheathed heater |
| Sensor | Pt100Ω |
| Reservoir design | Flat-shaped bath, no heater or sensor inside (easy cleaning) |
| Additional functions | Overshoot alert, auto-resume (selectable), calibration offset |
| Safety | Automatic + independent overheat prevention, temperature upper-limit error, overcurrent protection fuse |
| External dimensions | φ262 mm (max. D286) × H240 mm |
| Weight | Approx. 4.5 kg |
| Bath medium | Water |
| Country of origin | Japan/China (brochure: China) |
| Included | Power cable, spare main fuse, spare 2 A service-outlet fuse |
| Optional | BC102 bath protection cover |
| Power supply | 100–115 V, 10–12 A, 50/60 Hz |
Application Profile
A water bath is the standard tool for holding samples at a stable, sub-boiling temperature where dry heat would be uneven or too harsh. The BM-302A's PID control and Pt100Ω sensor give tighter regulation (±1 °C) than a simple analog bath, which matters for enzyme and molecular-biology steps, reagent equilibration, gentle thawing of frozen aliquots and media, and constant-temperature incubation of tubes and small vessels. The 90 °C ceiling keeps operation safely below boiling for aqueous work (see water-bath-vs-oil-bath-selection).
The bath's defining practical feature is its flat-shaped reservoir with no heater or sensor inside, nothing protrudes into the water to trap residue, so the 5 L tank cleans quickly between applications and there is less risk of contamination carrying over. Convenience functions (overshoot alert, selectable auto-resume after a power interruption, and calibration offset) plus layered overheat and overcurrent protection make it dependable for daily unattended use. For higher-temperature or non-aqueous work, an oil bath (Yamato BO/BOG/BOS series) is the correct selection; the optional BC102 bath protection cover reduces evaporation and heat loss during extended runs.
Frequently Asked Questions
What temperature range does the BM-302A reach? Room temperature +10 °C to 90 °C, regulated by PID control to ±1 °C, a sub-boiling range for aqueous work.
How is it different from an analog bath like the BM-100? The BM-302A uses digital PID control with a white LED display and Pt100Ω sensor for tighter regulation, whereas the BM-100/110 are analog dial-set baths. The BM-302A's flat reservoir also has no internal heater or sensor, making it easier to clean.
What capacity is the tank? Approximately 5 L. A protective cover (BC102) is available as an option to limit evaporation and heat loss.
Why does it clean so easily? The heater and sensor sit outside the flat-shaped reservoir, so nothing protrudes into the water to trap residue, the tank wipes clean directly.
What voltage does it use? The BM-302A is the 100–115 V (10–12 A) unit. The 200–230 V sibling is the BM-312-A.
Ordering & Configuration
quote-based. The BM-302A is a benchtop digital water bath sold through a quote. At quote we confirm 100–115 V service, whether you want the optional BC102 bath protection cover, and lead time. Warranty terms are confirmed with the quote. Request a quote to add the BM-302A to your bench.
BM digital water bath, by voltage: the BM-302A (this unit, 100–115 V) and the BM-312-A (200–230 V) are the same 5 L PID digital bath on different mains. Choose the BM-302A for precise sub-boiling aqueous work; step to a Yamato oil bath (BO/BOG/BOS) for temperatures above ~90 °C or non-aqueous media, and add the BC102 cover to cut evaporation on long runs.
