-
E-mail
tsaohsingz@163.com
-
Phone
15992468168
-
Address
Room 2308, East Block, Ocean Pearl Building, No. 23, Huali Road, the Pearl River New Town, Tianhe District, Guangzhou
Zhuhai Zaoxin Enterprise Co., Ltd
Error sources of SHELLAB air drying oven
Date: 2025-06-13Read: 1
The error sources of SHELLAB air drying oven mainly involve factors such as the performance of the equipment itself, operating environment, and usage mode. The following is a detailed analysis of the sources of error and proposed solutions:
1、 SHELLAB air drying oven equipment itself factors:
1. Accuracy of temperature sensor
Source: Manufacturing errors or aging of sensors may lead to temperature measurement deviations.
Impact: The difference between the actual temperature and the displayed temperature.
Solution: Regularly calibrate the sensor and compare and verify it using a standard thermometer (such as a second-class standard mercury thermometer).
2. Uniformity of heating system
Source: Uneven distribution of heating elements (electric heating tubes or heating plates) or unreasonable design of air ducts leading to temperature gradients inside the chamber.
Impact: Temperature differences at different locations on the same floor.
solve:
Empty load testing chamber uniformity (such as nine point temperature measurement), select models with good uniformity;
Avoid placing samples near air vents or heating sources.
3. Temperature control system error
Source: Improper PID controller parameter settings (such as wide proportional band or long integration time), or temperature control program fluctuations.
Impact: Temperature fluctuations.
solve:
Optimize PID parameters through self-tuning function;
Choose models with fuzzy control or higher precision temperature controllers.
4. Equipment aging and wear and tear
Source: After long-term use, the sealing strip may age, the heating element may age, or the fan may malfunction.
Impact: Decreased temperature stability or slower heating rate.
Solution: Regular maintenance and replacement of vulnerable parts (such as sealing rings and fan bearings).
2、 SHELLAB air drying oven operation and environmental factors:
1. Impact of sample loading
Source: Too many samples, too dense placement, or differences in heat absorption/release characteristics.
Impact: Local temperature deviation from the set value (such as cooling caused by excessive load during high-temperature sterilization).
solve:
Control sample density;
Use trays to dissipate heat (such as stainless steel trays for better thermal conductivity).
2. Environmental temperature fluctuations
Source: The laboratory environment temperature is too high or too low, which affects the stability of equipment temperature control.
Impact: The deviation between the actual chamber temperature and the set value increases.
Solution: Place the device in a constant temperature environment (such as an air-conditioned room), avoiding direct sunlight or near ventilation openings.
3. Voltage fluctuations
Source: Unstable voltage in the power grid leads to fluctuations in heating power.
Impact: Abnormal heating rate or temperature fluctuations.
Solution: Configure a regulated power supply or choose equipment with a wide voltage design.
4. Frequency of door opening and closing
Source: Frequent opening of doors leads to a sudden drop in temperature inside the chamber, especially in high temperature or high humidity experiments.
Impact: Prolonged time to restore set temperature, affecting experimental consistency.
Solution: Reduce the number of door openings and use quick sealing doors (such as magnetic door seals).
3、 Experimental method factors
1. Temperature measurement position error
Source: The sensor was not placed in the actual position of the sample.
Impact: The difference between the displayed temperature and the actual temperature of the sample.
Solution: Insert the sensor into the center of the sample or use an independent probe to directly contact the sample.
2. Insufficient preheating time
Source: The sample was placed without waiting for the chamber temperature to stabilize.
Impact: There is a significant temperature fluctuation in the initial stage.
Solution: Preheat for at least 20-30 minutes without load, and extend the preheating time appropriately when fully loaded.
3. Impact of sample container
Source: Local temperature difference caused by using glass containers (poor thermal conductivity) or metal containers (fast thermal conductivity).
Impact: Uneven heating of the sample.
Solution: Choose a container that is resistant to high temperatures and has uniform thermal conductivity, or wrap the sample with metal foil.
