1. Refrigeration system: It adopts low-noise air-cooled hermetic compressor unit, which has the advantages of fast refrigeration speed and strong temperature stability.
2. Control system: new special software research and development of self-made temperature control technology, equipped with high-standard Pt100 and all imported electronic components.
3. Circulation system: It is composed of internal and external circulation. During the external circulation, the constant temperature liquid in the tank can be introduced outside, and a second constant temperature field can be established. It can also be used as a cold source to guide the refrigerated liquid in the tank to the external experimental container to cool down. When circulating, the temperature of the liquid in the tank can be very uniform and stable.
4. Protection system: Refrigeration has overheating and overcurrent protection. The control system has functions such as over-temperature chirp alarm, upper and lower limits of temperature can be set for over-temperature alarm temperature, and the load can be automatically cut off when over-temperature.
5. High-end large LCD control instrument, easy to operate, strong temperature stability, PID can be automatically searched or manually adjusted.
6. The accurate temperature correction function can reach 0.01°C, and the temperature fluctuation can reach up to ±0.005-0.01°C (depending on the model).

Figure 1: Outline structure of constant temperature bath

Figure 2: Bath control panel
| model | temperature range | power | volume | groove depth |
| BD0506 | -5~100 | 0.8 | 6L | 150 |
| BD1006 | -10~100 | 0.9 | 6L | 150 |
| BD2006 | -20~100 | 1 | 6L | 150 |
| BD3006 | -30~100 | 1.5 | 6L | 150 |
| BD4006 | -40~100 | 2.1 | 6L | 150 |
| BD0510 | -5~100 | 1.3 | 10L | 200 |
| BD1010 | -10~100 | 1.5 | 10L | 200 |
| BD2010 | -20~100 | 1.8 | 10L | 200 |
| BD3010 | -30~100 | 2 | 10L | 200 |
| BD4010 | -40~100 | 2.1 | 10L | 200 |
| BD0515 | -5~100 | 2.1 | 15L | 200 |
| BD1015 | -10~100 | 2.2 | 15L | 200 |
| BD2015 | -20~100 | 2.3 | 15L | 200 |
| BD3015 | -30~100 | 2.4 | 15L | 200 |
| BD4015 | -40~100 | 2.5 | 15L | 200 |
| BD0520 | -5~100 | 2.3 | 20L | 300 |
| BD1020 | -10~100 | 2.4 | 20L | 300 |
| BD2020 | -20~100 | 2.5 | 20L | 300 |
| BD3020 | -30~100 | 2.6 | 20L | 300 |
| BD4020 | -40~100 | 2.7 | 20L | 300 |
| BD0530 | -5~100 | 2.5 | 30L | 230 |
| BD1030 | -10~100 | 2.6 | 30L | 230 |
| BD2030 | -20~100 | 2.7 | 30L | 230 |
| BD3030 | -30~100 | 2.7 | 30L | 230 |
| BD4030 | -40~100 | 3 | 30L | 230 |
| same parameters | ||||
| resolution | 0.001°C | |||
| Volatility | ±0.005-0.01℃ | |||
| cycle mode | Inner loop | |||
| Unit: ℃/Kw/mm | ||||