Understand the control difficulties of the stability test of the drug stability test chamber

With the raging new crown epidemic in recent years, society has paid more and more attention
to medicine, vaccines and other aspects.
Drug stability test chambers are very important in vaccines
, drugs, sample collection, production and research and development.
The series of drug stability test chambers also need to improve their own technical requirements
with the development of the times.
As the name implies, the drug stability test chamber focuses on "stability", we need to understand the control difficulties of the drug stability test chamber, and be familiar with its performance and operation specifications, so that the equipment can be better used during the test or in the later maintenance, and the impact of
the equipment on the test sample or test results can be reduced 。 First, the drug stability test chamber humidity control difficulties: Generally speaking, the constant temperature and humidity chamber and other stability test chambers are selected isothermal humidification, commonly used isothermal humidification mainly in two forms: 1.
Electric humidification is the use of electrode humidifier: the electrode is in contact with water, the energized electrode and water form a current loop, and steam
is generated after heating the water with the current 。 The biggest problem with this method is that the amount of humidification is very unstable due to the conductivity of the water quality: first of all, the water source cannot use deionized water, pure water or distilled water, because the current cannot form a loop from the working principle; Secondly, if tap water is used, the water quality in the north and south of China is very different, and the water quality with high hardness is easy to scale and lead to damage to the humidification tank; For water quality with low ion concentration, that is, low conductivity, it often cannot reach the rated humidification amount
of the equipment.
Therefore, it is best to use demineralized water, but the conductivity changes as the ion concentration gradually increases during the humidification process, so the humidification amount is not easy to control
.
2.
Later, the electric heating humidifier was developed: its working principle is completely different from the electrode type, the electric heating tube is immersed in water, and the electric heating tube generates heat after being energized, so that the water heats up to produce steam
.
Electric heating and humidification is to control the amount of steam output by controlling the heating power of the heating element, so it can achieve high humidification accuracy, and various water quality such as demineralized water and deionized water can be
achieved.
However, at present, the electrode humidifier has not been eliminated, and the main reason is that the price is cheaper
than the electric heating.
Second, Transchuang Technology Co.
, Ltd.
uses the method of humidification of
heating tubes.
Environmental protection, clean, low operating cost, high degree of automation, stable performance, can ensure stable and uniform
humidity for a long time.
The humidity control system is optimized for long-term stable operation, ensuring that the relative humidity is controlled at a preset level and within the allowable fluctuation range
.
No matter which heating method is inseparable from the detection of the controller, the controller can intuitively reflect the temperature and humidity parameters of the test chamber, adjust the environmental conditions of the test chamber in real time, and ensure the stable operation
of the test 。 Controller: the equipment adopts intelligent temperature and humidity touch screen control instrument, temperature and humidity can be directly set and displayed, equipment running time accumulation, can correct measurement errors online, etc.
, there is a control switch unit on the controller, which can separately control the start and stop of the working unit, and there are equipment over-temperature, water cut, water shortage and other fault prompt screens, powerful functions, convenient for the operation and monitoring of the whole machine system (if you need to network the remote operation and observation of the equipment, you need to customize when ordering).