Circular water bath nitrogen blower with 24 position temperature control heating

Circular water bath nitrogen blower with 24 position temperature control heatingCH-DCY-24Y

Usage and maintenance of circular water bath nitrogen blowing instrument

1 Purpose
Standardize the operating procedures of nitrogen blowers, rigorously use nitrogen blowers, ensure the progress of testing work, and ensure the personal and equipment safety of operators.
2 Scope of application
Suitable for the operation of circular water bath nitrogen blowing instrument.
3 Responsibilities
3.1 Operators shall use the nitrogen blower in accordance with this regulation.
3.2 The custodian is responsible for supervising whether the use and operation comply with the regulations, and regularly maintaining and testing.
3.3 The department head is responsible for comprehensive management.
4 Operation methods
4.1 Preparation work.
Before using the nitrogen blower, operators should be familiar with the workflow and steps. Rapid concentration requires a balance between sample size, nitrogen flow rate, water bath temperature, and needle position. Improper use can result in twice the result with half the effort, and even contaminate or cause sample loss. At the same time, attention should be paid to environmental conditions such as the degree of air pollution, nitrogen purity, and sample transportation process inside the fume hood.
4.2 Water bath operation
4.2.1 Turn on the water bath power switch.
4.2.2 Set the water bath temperature. Set the temperature through the left column buttons "∧" or "∨" on the operation panel. The lower row displays the "set temperature" (usually set at 50 ℃ when leaving the factory). Press "∧" or "∨" to display the desired temperature value in the lower row. Usually, the water bath temperature should be 2-3 ℃ lower than the boiling point temperature of the solvent. Press the "SET" key to switch to the time setting interface, use "∧" and "∨" to change the timing value (from 0 to 99h59m, if it is greater than 99h59m, CONT will be displayed, which is normally open), hold down any one of the keys, and the number will quickly increase or decrease to the desired time. Then press the "START" button to start the timer and heating. At this time, the heating indicator light "HEATING" and the start indicator light "RUN" will light up. After reaching the scheduled time, the buzzer will sound an alarm, and the machine will stop heating and restore the initial scheduled time value.
4.3 Operation of circular water bath nitrogen blower.
4.3.1 Lift the nitrogen blower to position and lock it.
4.3.2 Place the sample test tube on the sample positioning rack, fix the test tube with the sample positioning rack spring, and place the bottom of the test tube on the support tray. Record the position where the sample is placed. If the support tray is too low, loosen the two positioning screws on the center ring of the support tray. Raise the support tray until the bottom of the test tube is on the tray, not less than 15mm away from the positioning frame. Adjust the support tray to align the slit with the test tube. Tighten the positioning screws again to secure the support tray.
4.3.3 Install the stainless steel ventilation needle and simply screw it on.
4.3.4 Open the nitrogen cylinder and adjust the flow meter to supply air to the nitrogen blower. Nitrogen needs to be turned on a little bit, otherwise the pressure will be too high and the pipeline will be flushed open. Adjust the flow meter to the desired pressure.
4.3.5 Lower the needle until it is 6mm away from the surface of the solution. Adjustment: Unscrew the locking nut on the valve plate, and the needle valve tube can slide up and down. Adjust the height and tighten the locking nut.
4.3.6 Open the flow valve of the sample grade used. Generally, rotating counterclockwise by 1/8 to 1/6 turn is sufficient.
Before concentrating the sample, it is recommended to blow nitrogen air for 5-10 minutes to prevent residual impurity gases in the nitrogen blowing instrument gas path.
4.3.8 Adjust the flow rate from the flowmeter to the nitrogen blower. Start nitrogen blowing and fine tune the flow rate using the flow valve on the needle. And monitor the gas supply pressure, which shall not exceed 200Kpa. Adjust the flow valve to create ripples on the surface of the sample, but prevent splashing.
4.3.9 Continuous vaporization until completion. According to the requirements of non drying boundary points, vaporization must be monitored and the sample must be removed after reaching the desired boundary point.
When vaporization is complete, use a clean pipette and rinse the stainless steel needle with one or two drops of solvent.
4.3.11 Slide the needle valve tube upwards and remove the sample tube from the sample positioning rack.
4.3.12 After vaporization is completed, turn off the gas source.
4.3.13 Turn off the flow meter and flow valve.
4.3.14 Turn off the water bath power.
4.3.15 Remove the stainless steel needle.
5 Precautions and Maintenance
5.1 The heating medium can be distilled water or deionized water. Using distilled water and deionized water can prevent dirt from forming on the water bath wall.
5.2 It is recommended to change the water in the water bath once a day for no more than a week.
5.3 After each use, the needle should be cleaned to minimize contamination. Organic solvent flushing, high-pressure disinfection, and Soxhlet extraction techniques can be used.
5.4 The bottom of the bath is resistant to dust but not waterproof. Do not immerse the machine in any liquid or place it in areas where soaking may occur.
5.5 Register usage records after use.

Circular water bath nitrogen blower with 24 position temperature control heatingCH-DCY-24Y

Working principle of circular nitrogen blower

The circular nitrogen blower achieves rapid concentration of a large amount of samples by rapidly, continuously, and controllably blowing nitrogen gas onto the surface of heated samples.
The nitrogen blower uses the rapid flow of nitrogen to break the gas-liquid equilibrium above the liquid, thereby accelerating the evaporation rate of the liquid. It also raises the temperature through dry heating or water bath heating (the boiling point of the target substance is generally higher than that of the solvent), achieving the goal of anaerobic concentration of the sample and keeping it purer. Using a nitrogen blower instead of a commonly used rotary evaporator for concentration can concentrate dozens of samples simultaneously, greatly reducing sample preparation time, and has the characteristics of time-saving, easy operation, and speed

Precautions for nitrogen blowing instrument

1、 Security protection
Wear protective equipment: Gloves, goggles, and lab coats should be worn during operation to prevent chemical spills or high-temperature burns.
Ventilation requirements: It must be operated in a fume hood to avoid the accumulation of harmful gases or the impact on experimental accuracy.
Electrical safety: Use a three wire grounded power supply and do not open the water bath casing with electricity to prevent electric shock.
2、 Operating standards
Nitrogen control:
Use high-purity nitrogen and regularly check the pressure and flow rate of the gas source.
Adjust the nitrogen pressure to an appropriate range to avoid sample splashing or excessive drying.
Temperature management:
Set the temperature according to the sample requirements to avoid sample decomposition or equipment damage caused by high temperatures.
Do not move the nitrogen blower during heating to prevent burns.
Sample monitoring: Regularly observe the concentration status to avoid excessive drying or loss.
3、 Environmental and equipment requirements
Material limitations:
It is prohibited to handle substances with a flash point below 100 ℃ (such as petroleum ether) and acidic/alkaline samples.
Use distilled water or deionized water as the heating medium to avoid scaling or corrosion of the instrument.
Equipment maintenance:
Regularly replace consumables such as filters and seals, clean the water bath and replace the water (recommended once a week).
Immediately neutralize and rinse after contact with acidic substances.
4、 Maintenance and repair
Professional maintenance: Instrument maintenance must be operated by professional personnel to avoid safety hazards caused by self replacement of components.
Calibration and inspection: Regularly calibrate temperature and pressure sensors, and check for leaks in the air circuit connections.
5、 Other precautions
Experimental records: Timely record concentration time, temperature, gas flow rate and other parameters for subsequent analysis.
Cleaning requirements: Clean the needle after each use to prevent cross contamination.
By implementing the above standardized operation and maintenance measures, the safe use of the nitrogen blower can be ensured, the lifespan of the equipment can be extended, and the accuracy of experimental results can be improved.