I.  Introduction
 
In clinical conditions, the infusion fluid is often different with patient’s body in terms of temperature, which may cause patient suffering hypothermia and mentality atrophic, and the same cause syndrome of hypodynamia easily, ague, spasm of blood vessel muscle, arthritis ache and stomachache, even threaten the life if seriously. If the transfused solution is preheated in order to reduce the temperature difference with the blood, the patient can feel better, and the drug can be easily dissolved in the solution, thus enhancing absorption.
 
II. Working principle
The Warmer is an indirect heating device (dry warmer) and can be used repeatedly. The transfused fluid is heated up when it passes the infusion tube and the Warmer conducts heat to the solution via the infusion tube.
III. Main technical specifications
1. Environmental conditions of transportation and storage

1. Ambient temperature: -40～+55℃
2. Relative humidity: ≤ 80%

2. Environmental conditions of operation

1. Ambient temperature: 5～40℃
2. Relative humidity: ≤ 80%
3. Power supply: AC 100-240V
4. Frequency: 50Hz  

3. Input power ≤ 80W     
4. Temperature controlling    
a) Liquid temperature at the exit:
Low 30～38℃;  (default: Low)
Middle 32-40℃,
High 34～40℃ 
b) Displaying error of temperature: ≤ 2℃ 
5. Safety measure:     
Normaly, the Warmer shall keep the temperature within preset range, but if the heating panel exceeds 41℃, the Warmer shall automatically stop heating, and meanwhile give an alarm signal (to alert the user) along with yellow “ALARM” LED glimmering. When the heating panel cools down to temperature below 41℃, the “ALARM” LED shall automatically turn off.
6. Suitable speed of infusion liquid: 40～80 drops/min   
7. Four tubing channels: Suitable for tubings of different lengths (23cm, 32cm, 41cm, 50cm). Two tubings can be warmed at the same time.
8．Max. Weight: ＜650g