The Yamato BM-401 is a 7-liter digital constant-temperature water bath — the largest-capacity model in Yamato's economy BM series. A PID microprocessor holds ±1 °C at 60 °C across an RT +5 to 95 °C range, set simply with ▲/▼ keys on an LED display. A protected water tank and integrated drain make it safe and easy to run daily, and at roughly 7 kg it stays a benchtop instrument while offering more working volume than the 4–5 L baths in the same line.
Key Specifications
| SKU | BM-401 |
| Model | Yamato BM401 — BM-series economy water bath |
| Type | Digital constant-temperature water bath |
| Operating temperature range | RT +5 to 95 °C |
| Control accuracy | ±1 °C (at 60 °C) |
| Control system | PID by microprocessor; digital ▲/▼, LED, 1 °C resolution |
| Bath capacity | ~7 L |
| Heater / sensor | SUS316 pipe heater, 1 kW / K thermocouple |
| Operation functions | Fixed temperature, auto start, auto stop, quick auto stop |
| Additional functions | Calibration offset, power-failure recovery, keypad lock |
| Safety | Bath protection cover; self-diagnostics; circuit protector; thermal fuse |
| Drainage | Equipped with drain |
| External dimensions | W310 × D360 × H230 mm; approx. 7 kg |
| Power source | AC115V, 11 A (50/60 Hz single phase) |
| Country of origin | Japan |
Application Profile
A water bath is the standard tool for gentle, even, water-mediated heating — thawing, warming reagents, or incubating samples — rather than the dry, higher-temperature heat of an oven. The BM-401 covers RT +5 to 95 °C, the practical span for aqueous work, and its PID microprocessor keeps the setpoint to ±1 °C at 60 °C so temperature-sensitive samples stay stable. Water's high thermal mass gives a bath far better uniformity than a hot plate, and the 7 L tank accommodates larger vessels or higher sample counts than the 4–5 L models in the line. The protected water tank keeps the SUS316 heater away from hand contact to prevent burns, the built-in drain avoids tipping a full tank, and calibration offset trims the reading against a reference. Safety is layered — bath protection cover, self-diagnostics, circuit protector, and thermal fuse. As with any open bath, maintain water level and use a cover near the top of the range to limit evaporation.
Frequently Asked Questions
Is the BM-401 analog or digital? Digital. Temperature is set with ▲/▼ keys and shown on an LED display with 1 °C resolution, under PID microprocessor control. (The analog models in this series are the BM100/110.)
Does it have a drain? Yes — the BM-401 is equipped with a drain, so you can empty the ~7 L tank without lifting or tipping it, and the protected tank keeps the heater away from hand contact.
What voltage does it use? AC115V at 11 A. The BM401 is listed only as a 115 V unit; if you need a 200–240 V bath, the BM510 is the sibling model. Confirm supply voltage at order.
Ordering & Configuration
Confirm at quote: supply voltage (BM401 is 115 V) and any optional bath cover or accessories for your vessel format. Warranty: per Yamato standard terms — confirm coverage at quote. Add the Yamato BM-401 to a quote to confirm configuration and lead time.
Choosing within the BM line: BM302-A/312-A (5 L digital) use a flat-bottom tank with no internal heater for easy cleaning; BM100/110 (4 L analog) are the simplest option; BM500/510 (4 L digital) add a removable tank and agitation control (BM510 is 200–240 V). Pick the BM-401 for the most bath volume with digital control and a drain on a 115 V bench.
