Definition
The three-hole thermostatic circulation tank is a laboratory temperature-controlled equipment that transports thermostatic liquids to three independent working holes through a built-in circulation pump, providing a stable and uniform temperature environment for external experimental equipment. It is usually used in situations where multiple synchronous temperature control is required, and its design takes into account the accuracy of temperature control and the convenience of multitasking.
Principle
The core of the equipment is composed of a constant temperature tank, a heating and cooling system, a circulation pump and a temperature control system. The temperature control system drives the heating or cooling unit to work according to the real-time temperature difference between the set temperature and the sensor feedback, so that the temperature of the medium reaches and maintains the set point. The built-in circulation pump pumps thermostatic media to three parallel output holes, which are connected to external jackets, reactors, or other components that require temperature control through pipelines to form a closed loop for precise temperature control of external equipment.
Measurement and calibration methods
Verification of temperature accuracy is usually carried out according to relevant national or international standards. A common method is to insert a meter-calibrated, high-precision platinum resistance thermometer into the tank working area or a loop loop in one of the output holes and compare it with the display temperature of the device itself. When measuring, it is necessary to ensure that the thermometer temperature sensing element is fully exposed to the thermal conductive medium, and test at multiple typical temperature points (such as low temperature point, normal temperature point, high temperature point) to record the stable reading deviation. For the evaluation of temperature uniformity, multiple sensors can be placed at different spatial locations in the tank or in each output hole loop, and their temperature fluctuation range can be measured and calculated at the same time.
Performance Factors
Equipment performance is affected by a variety of factors. The choice of thermal conductive medium directly affects the heat transfer efficiency and temperature control range, and its viscosity, specific heat capacity, flash point and chemical compatibility need to be considered. Fluctuations in ambient temperature can interfere with cooling power and thermal balance. The length and inner diameter of the circulation pipeline and the heat load of the external controlled equipment will affect the flow resistance and heat exchange efficiency of the system, which may cause temperature fluctuations. In addition, the heating and cooling power of the equipment, the accuracy of the control algorithm, and the thermal insulation design of the system are all key to maintaining temperature stability.
Applications
This equipment is widely used in scientific research and industrial testing scenarios that require multiple channels of precise temperature control. In chemistry, it can provide a constant temperature source for multiple parallel reactors or distillation units. In materials research, it is used to control the temperature of multiple sample aging chambers or viscometers. In the analytical and testing industry, temperature management can be performed for sample cells of multiple rotary evaporators, refractometers, or titrators. Its porous independent output characteristics effectively improve the efficiency of laboratory space utilization and the parallel ability of experiments.
Selection considerations
When selecting, it is necessary to comprehensively evaluate the technical parameters and actual needs. The temperature range should cover the minimum and maximum operating temperatures required for the experiment, with appropriate margins. The temperature stability and uniformity indexes need to meet the requirements of experimental accuracy. The flow rate and pressure of the circulation pump need to be sufficient to overcome the total flow resistance of the external circulation line to ensure effective circulation of the medium. The size and interface shape of the working hole should match the external device. It is also necessary to consider the cooling method, heating power, safety protection functions, user-friendly design of the operation interface, and the convenience of daily maintenance. It is recommended to make a comprehensive judgment based on the specific application load, environmental conditions, and long-term operating requirements.