The BM-100 is Yamato's entry-level analog water bath, a 4 L stainless tank with a simple dial-set, liquid-operated thermoregulator and a bar-thermometer readout. It is the 115V variant of the BM series 4 L bath (the 230V sibling is the BM-110). Built for routine benchtop water-bath heating where a controller display and digital PID are unnecessary: sample warming, reagent thawing, gentle constant-temperature incubation, and teaching-lab use.
Key Specifications
| SKU | BM-100 |
| Type | Analog water bath, dial set |
| Tank capacity | 4 L |
| Tank dimensions | Φ20 cm × depth 12 cm (Φ7.9 in × 4.7 in) |
| Temperature range (operation) | Room temp. +5 °C to 95 °C |
| Temperature setting range | 0 °C to 100 °C |
| Temperature accuracy | ±2 °C at 60 °C |
| Control system | ON/OFF control, analog set-up |
| Thermoregulator | Liquid-operated thermoregulator |
| Display | Bar alcohol thermometer (−10 to 110 °C) |
| Heater | SUS316 pipe heater, 500 W |
| External dimensions (W×D×H) | 24 × 30 × 15 cm (9.4 × 11.8 × 5.9 in) |
| Weight | 3.5 kg (7.7 lb) |
| Bath medium | Water |
| Voltage | 115V, 50/60 Hz (230V sibling = BM-110) |
Application Profile
The 4 L analog bath is sized for single-user, routine constant-temperature work rather than production throughput:
- Reagent and sample warming to physiological or set-point temperatures
- Gentle thawing of frozen aliquots, media, and buffers
- Constant-temperature incubation of small tube batches and reaction vessels
- Enzyme and molecular-biology steps requiring stable sub-boiling water temperatures
- Teaching laboratories where a rugged, low-cost, dial-set bath is preferred over digital instrumentation
With an operating ceiling of 95 °C (sub-boiling) and ±2 °C control at 60 °C, the BM-100 targets applications where broad stability, not tight uniformity, is the requirement.
Design Architecture
The bath uses a liquid-operated thermoregulator driving ON/OFF control of a 500 W SUS316 pipe heater, a proven, serviceable analog scheme with no digital controller to configure. Temperature is set by dial and read directly on a supplied bar alcohol thermometer. The stainless tank holds 4 L of water (Φ20 × 12 cm interior). A paddle power switch and power-on lamp complete the front controls, and the unit protects itself with an overcurrent fuse. After a power interruption, the bath resumes operation at its previous dial setting.
Because the BM series uses water as its medium, the practical ceiling is well below boiling; for higher-temperature or non-aqueous work, an oil bath (Yamato BOG/BOS or BO series) is the correct selection. See the water-bath-vs-oil-bath selection guidance.
Frequently Asked Questions
What temperature range does the BM-100 reach? The BM-100 operates from room temperature +5 °C up to 95 °C, with a dial setting range of 0 °C to 100 °C. Because it uses water as the bath medium, its practical ceiling stays below boiling.
Is the BM-100 available in a 230V version? The BM-100 is the 115V, 50/60 Hz variant. For 230V/50Hz supply, order the BM-110. It is the same 4 L bath in the 230V configuration.
What is included with the BM-100? It ships with a bar alcohol thermometer (−10 to 110 °C), a spare fuse, the instruction manual, and a guarantee card.
How accurate is the BM-100's temperature control? The BM-100 uses a liquid-operated thermoregulator with ON/OFF control and holds ±2 °C at 60 °C, sized for broad stability rather than tight uniformity.
Can the BM-100 be used with oil for higher-temperature work? No. The BM series is a water bath. For non-aqueous or above-100 °C work, a Yamato oil bath (BOG/BOS or BO series) is the correct selection.
Ordering & Configuration
In the box: bar alcohol thermometer (−10 to 110 °C), spare fuse, instruction manual, and guarantee card.
Confirm voltage. The BM-100 is the 115V variant; order the BM-110 for 230V/50Hz supply. Both are the same 4 L bath.
Fill with water only. The BM series is a water bath, roughly 3 L working fill is typical for the 4 L tank. Drain and dry the tank before extended storage.
A catalog-priced benchtop instrument; no quote gate. Confirm supply voltage matches the SKU (115V) at checkout.
Warranty: Per Yamato standard terms, guarantee card included.
Yamato BM analog water bath family:
- BM-100 (this product): 4 L, 115V
- BM-110: 4 L, 230V
For non-aqueous or >100 °C work, step to a Yamato oil bath (BOG/BOS glass or stainless, or BO-302A/312A 5 L).
