. One sentence to distinguish core positioning
– High and low temperature integrated machine: versatile in both heating and cooling, achieving heating + cooling + circulation + precise temperature control with one device, covering a wide temperature range
– Low-temperature coolant circulation pump: Pure low-temperature cooling, featuring only refrigeration and circulation, with no heating function
. Comparison of Key Parameters
1. Function and temperature range
– High and low temperature integrated machine
– Function: cooling + heating + circulation + PID temperature control
– Temperature: -120℃~+200℃
– Temperature control: accuracy ±0.1℃, supports programmable temperature control
– Low-temperature coolant circulation pump
– Function: Cooling and circulation only, no heating
– Temperature: -120℃～+40℃ (commonly -40℃～room temperature)
– Temperature control: accuracy ±0.1℃, maintaining only low-temperature constant temperature
2. Medium and system
– High and low temperature integrated machine
– Medium: Primarily **heat transfer oil (silicone oil)**, non-volatile at high temperatures, with a low freezing point
– System: Fully enclosed dual-circuit (high/low temperature independent), oxidation-resistant, long lifespan
– Low-temperature cooling liquid circulating pump
– Medium: ethylene glycol aqueous solution, alcohols, resistant to low temperatures, and non-freezing
– System: Single refrigeration circuit, simple structure, low cost
3. Applicable scenarios
– High and low temperature integrated machine
– Requiring repeated switching between high and low temperatures: temperature control of reaction vessels, high and low temperature testing of materials, pharmaceutical crystallization
– Wide temperature range process: -80℃ low temperature reaction → 200℃ high temperature polymerization
– Low-temperature coolant circulation pump
– Only requires continuous low-temperature cooling: rotary evaporator condensation, low-temperature extraction, laboratory cold source
– Supporting equipment: reaction kettle jacket cooling, spectrometer/vacuum pump cooling
. How to choose (directly give the conclusion)
Selecting a high and low temperature integrated machine: requires heating + cooling, wide temperature range, complex process, frequent temperature changes
Choose a low-temperature coolant circulation pump: if you only need low temperature, have a limited budget, and only need cooling/temperature maintenance