The selection of a three temperature zone experimental tube furnace should focus on core parameters such as temperature range, heating elements, furnace tube material, temperature control accuracy, temperature zone design, and atmosphere control, and be comprehensively evaluated based on experimental requirements. Let's take a detailed look below!

1. Core parameters and selection logic
Temperature range and heating element
Below 1200 ℃: Use molybdenum containing resistance wire for heating, paired with quartz tube furnace tube. Quartz tube is transparent and easy to observe, with low cost, suitable for medium and low temperature experiments (such as teaching and conventional material testing).
1200-1400 ℃: Heating with silicon carbon rods and aluminum oxide furnace tubes. Aluminum oxide is resistant to high temperatures and oxidation, suitable for high-temperature sintering or metal melting.
1400-1700 ℃: Use silicon molybdenum rods for heating, paired with high-purity alumina furnace tubes. Silicon molybdenum rods can work stably at 1700 ℃ and are suitable for extreme environmental experiments such as ceramic sintering and thin film preparation.
Example: PT-T1600-L6012CB3 three temperature zone furnace, with a maximum temperature of 1700 ℃, heated with silicon molybdenum rods and aluminum oxide furnace tubes, suitable for CVD thin film epitaxial growth.

Temperature control accuracy and temperature zone design
Independent temperature control: Each temperature zone is equipped with an independent PID controller, which can set 30 temperature rise and fall programs with a temperature control accuracy of ± 1 ℃. Independent temperature control meets the requirements of gradient temperature control, such as single crystal growth and preparation of thermal gradient materials.
Constant temperature zone length: Choose a furnace type with a constant temperature zone longer than the sample to ensure uniform heating. For example, when processing long samples, a furnace type with a constant temperature zone of ≥ 300mm needs to be selected.
Example: PT-T1200-III three temperature zone furnace, with a constant temperature zone of 300mm (± 1 ℃), independent temperature control for three temperature zones, suitable for thin film preparation and sample heat treatment.

Furnace tube size and sample compatibility
Pipe diameter selection: Select the pipe diameter based on the sample size. Large samples require a diameter of at least 100mm, while batch processing of small samples requires a long furnace (such as 1500mm).
Variable diameter tube design: supports rotary heating or special process requirements.
Example: PT-T1200R large-sized furnace can process multiple samples simultaneously.

Atmosphere control and vacuum function
Inert/reducing atmosphere: equipped with vacuum system and gas inlet and outlet, customizable vacuum degree to meet high-purity experimental requirements.
Oxidation atmosphere: Ordinary furnace type is sufficient, but it is necessary to ensure that the furnace tube material is resistant to oxidation (such as 310S stainless steel).

Security and Extension Features
Protection functions: Over temperature alarm, leakage protection, and emergency shutdown are essential configurations.
Operation specifications: Pay attention to the pressure limit inside the furnace tube (such as the pressure inside the corundum tube ≤ 0.02MPa) to avoid high pressure causing rupture.
Modular upgrade: Prioritize models that support the installation of lifting mechanisms or quenching systems to adapt to future demand changes.

PT-T1600-L6012CB3 model three temperature zone tube furnace with a temperature of up to 1700 ℃ (click on the picture to view product details)

2. Selection suggestions
Clear experimental requirements: Select models based on core parameters such as temperature range, sample size, and atmosphere control.
Pay attention to temperature control accuracy and constant temperature zone: ensure temperature uniformity meets experimental requirements.
Consider security and scalability: Choose a model with protective features and support for modular upgrades.
Budget and after-sales service: Covering equipment costs and long-term consumables (such as furnace tubes and thermocouples) replacement costs, prioritize brands that provide rapid response technical support.Click to learn more Multi zone tube furnaces! Or click on online customer service to learn more about product information!