Electric blast drying oven is a core equipment used for drying, baking, sterilization and other operations in laboratories and industrial production. Its efficient and stable operation relies on standardized operating procedures and detailed usage details. The following provides specific explanations from four dimensions: preparation before startup, operation process, usage taboos, shutdown, and maintenance:

1、 Preparation before startup

1. Environmental inspection

Ensure that the equipment is placed on a horizontal table, with a reserved heat dissipation space of ≥ 30cm around it, and kept away from flammable materials and corrosive gases;

Confirm that the power supply voltage is consistent with the equipment nameplate identification, and that the grounding wire connection is reliable to avoid potential safety hazards caused by static electricity accumulation.

2. Sample pretreatment

Liquid samples should be placed in open containers (such as culture dishes), while solid samples should be spread flat on metal trays with a thickness not exceeding 2cm to ensure hot air penetration;

It is strictly prohibited to directly put sealed containers or samples containing volatile solvents into them to prevent sudden increase in internal pressure from causing explosions.

3. Parameter preset

Set the target temperature (recommended to be at least 50 ℃ below the ignition point of the substance) and time according to the experimental requirements. It is recommended to conduct a short-term trial run at low temperature to observe whether the actual heating curve meets expectations.

2、 Operation process control

1. Startup sequence

First turn on the fan switch, then activate the heating function, and use forced convection to quickly establish the temperature field inside the box;

Real time monitoring of temperature changes on the digital display screen. If there is an abnormal jump (such as not reaching 80% of the set value within half an hour), immediately stop the machine to troubleshoot sensor faults.

2. Temperature uniformity optimization

Place the sample on the middle shelf, avoiding the area directly exposed to the top heating element;

Samples from the same batch should have similar sizes/densities to avoid inconsistent drying levels due to differences in heat transfer;

If necessary, exchange sample positions every 30 minutes to eliminate the risk of local overheating.

3. Dynamic monitoring

Record temperature data at key time points and draw heating/cooling curves as reference for subsequent experiments;

If sampling is required midway, wear insulated gloves to quickly open and close the box door, reducing temperature fluctuations (single opening time<10 seconds).

3、 Usage taboos

Dangerous goods are prohibited from entering: organic solvent waste liquid, lithium battery materials, active metals such as sodium and potassium;

Overlimit operation is prohibited: it shall not exceed the rated temperature (usually ≤ 300 ℃) and the maximum loading capacity (usually 1/3 of the box volume);

Unauthorized modification prohibited: It is not allowed to modify circuits or shield safety interlock devices (such as over temperature alarms) without authorization.

4、 Shutdown and maintenance

1. Scientific cooling

After the experiment, turn off the heating switch first and keep the fan running continuously until the temperature drops below 60 ℃ before turning off to prevent waste heat accumulation and component aging;

In emergency situations, the main power can be directly cut off, but it may cause a sudden drop in temperature and damage the sample.

2. Regular maintenance

Clean the condenser filter screen once a week and wipe the inner wall and temperature probe with a dry cloth every month;

Check the resistance value of the heating tube every quarter and replace the aging silicone sealing strip;

Annual calibration of temperature sensors, using standard platinum resistance thermometers to correct deviations.

3. Long term suspension management

Empty all residual samples and open the box door for natural dehumidification for 48 hours;

Apply a thin layer of Vaseline on the surface of metal parts to prevent rust, and store in a dry and ventilated place.

5、 Special scenario response

-High humidity sample processing: Pre vacuum drying unit removes surface moisture and reduces the impact of initial humidity on drying efficiency;

-Thermal sensitive material drying: using a stepwise heating program (such as 50 ℃ → 70 ℃ → 90 ℃), with a constant temperature of 30 minutes in each stage;

-Sterilization of biological samples: Set a program at 160 ℃ for 2 hours, combined with paper packaging to ensure steam penetration.

By strictly following the above details, drying efficiency can be significantly improved (typical sample drying time can be shortened by 20% -30%), equipment service life can be extended to 8-10 years, while ensuring the accuracy of experimental results and operational safety.