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What are the precautions for the use of planktonic bacteria samplers?
日期：2024-04-16 08:32
浏览次数：188
摘要：The planktonic bacteria sampler equipment can be used as an ideal sampling instrument for the concentration of floating dust bacteria in the testing departments of various pharmaceutical factories, hospitals, biological products, food processing, public places, etc.
As a precision instrument, the planktonic bacteria sampler ensures the accuracy of detection. This sampler needs to be calibrated. Generally, two factors are mainly adjusted during calibration. That is, the target sampling time
The planktonic bacteria sampler equipment can be used as an ideal sampling instrument for the concentration of floating dust bacteria in the testing departments of various pharmaceutical factories, hospitals, biological products, food processing, public places, etc.
As a precision instrument, the planktonic bacteria sampler ensures the accuracy of detection. This sampler needs to be calibrated. Generally, two factors are mainly adjusted during calibration. That is, the target sampling time and flow are adjusted. This can thus meet the needs of the target total sample volume.
What are the precautions for use?
1. The planktonic bacteria sampler should be fully cleaned and sterilized. If the cleaning and sterilization is not sufficient, the bacteria on the planktonic bacteria sampler will fall off and fly, which may increase the number of bacteria collected, and there may be huge errors in the measurement results.
2. Correctly adjust the spray distance. The distance from the gas jet slit to the medium is related to the force with which the bacteria hit the medium. The closer the distance, the greater the impact force on the medium; the farther the distance, the smaller the impact force on the medium. The spray distance should be adjusted to the standard value before sampling.
3. Adjust the flow to the standard value. The flow rate of the gas is related to the jet velocity of the gas. If the speed is too large, the impact force will be large, and if the speed is too small, the impact force will be small, so the flow rate should be adjusted to the standard value before sampling.
4. Select the sampling time according to the bacterial concentration. The number of bacteria taken into the dish determines the density of bacteria in the dish. If the density is too small, the number of bacteria counted is small, and the statistical error is large; if the density is too large, it is easy to overlap each other, resulting in leakage counting error. So the density of bacteria in the petri dish should be moderate. When the concentration of bacteria in the gas is fixed and the flow rate of the gas is fixed, the longer the sampling time, the greater the density of bacteria in the petri dish; the shorter the sampling time, the lower the density of bacteria in the petri dish.
As a precision instrument, the planktonic bacteria sampler ensures the accuracy of detection. This sampler needs to be calibrated. Generally, two factors are mainly adjusted during calibration. That is, the target sampling time and flow are adjusted. This can thus meet the needs of the target total sample volume.
What are the precautions for use?
1. The planktonic bacteria sampler should be fully cleaned and sterilized. If the cleaning and sterilization is not sufficient, the bacteria on the planktonic bacteria sampler will fall off and fly, which may increase the number of bacteria collected, and there may be huge errors in the measurement results.
2. Correctly adjust the spray distance. The distance from the gas jet slit to the medium is related to the force with which the bacteria hit the medium. The closer the distance, the greater the impact force on the medium; the farther the distance, the smaller the impact force on the medium. The spray distance should be adjusted to the standard value before sampling.
3. Adjust the flow to the standard value. The flow rate of the gas is related to the jet velocity of the gas. If the speed is too large, the impact force will be large, and if the speed is too small, the impact force will be small, so the flow rate should be adjusted to the standard value before sampling.
4. Select the sampling time according to the bacterial concentration. The number of bacteria taken into the dish determines the density of bacteria in the dish. If the density is too small, the number of bacteria counted is small, and the statistical error is large; if the density is too large, it is easy to overlap each other, resulting in leakage counting error. So the density of bacteria in the petri dish should be moderate. When the concentration of bacteria in the gas is fixed and the flow rate of the gas is fixed, the longer the sampling time, the greater the density of bacteria in the petri dish; the shorter the sampling time, the lower the density of bacteria in the petri dish.