Humidity Control Test Procedure

The purpose is to demonstrate the capability of the air handling system to control humidity at the specified level for each room. 

It is the responsibility of validation team members to follow the procedures. The quality assurance (QA) manager is responsible for SOP compliance. 

The relative humidity at each grid point shall be within the specihed levels and tolerance limits indicated for each room in the validation master plan. If these levels are attained, the system is accepted. 

HUMIDITY CONTROL TTST PROCEDURE Company Name 

Date Time Area Room No. Humidity Within Tolerance  

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As reviewed it is important that test specimens or products be properly prepared based on available specifications and/or standards that provide controlled conditioning procedures when conducting weathering as well as all other tests. The following is one example. There are other conditions set forth to provide for testing at higher or lower levels of temperature and humidity. 

A number of tests exist within ASTM, SAE, ISO, and automotive standards that include a controlled humidity cycle as part of a total test procedure. 

Abbott studied the corrosion of contacts, and proposed quality tests in dilute mixtures of hydrogen sulphide, nitrogen dioxide and chlorine in air at controlled temperature and humidity . These gave good results in a project seeking improved procedures for British and lEC standards . 

In addition, the use of field fortification samples measures the carefulness factor of the Field Scientist during the field research and allows a Study Director/Manager or distant observer to obtain a quality control estimate on the field portion of the study. For this reason, the field fortification samples are usually meant to be different from laboratory procedural fortifications and are meant to be prepared under field conditions, which are considerably more rigorous than are controlled laboratory conditions. For example, environmental factors such as heat, humidity, wind, human stress, and other human factors such as fatigue to the Field Scientist are an integral part of any field worker exposure/re-entry study. Field fortifications made to matrices under these conditions will test and readily demonstrate the ability of the Field Scientist to perform such a difficult study under trying circumstances. 

Instead of putting the desiccant inside the dish, with a controlled humidity outside, the dish could contain water which is then transmitted out into a dry atmosphere and the amount transmitted measured by weight loss. By inverting the container, the transmission rate when the water is in contact with the test piece can also be measured. The transmission rates measured by the various alternative procedures will be different because different vapour pressure gradients across the test piece are being used and, logically, the conditions most relevant to service would be chosen. 

All laboratory facilities must be of adequate space and design to provide a suitable work environment for experimentation and testing. The facility must provide an appropriately controlled environment (temperature, humidity, venting, etc.) to allow for a consistent laboratory function. A secure environment with limited and controlled access is required to assure result integrity. Suitable instrumentation and equipment must be installed and qualified as per defined procedures. Scheduled periodic calibration must be performed to demonstrate proper instrumental suitability. Such procedures must be appropriately documented. Reagents and standards must be stored and handled in accordance with good laboratory procedures. 

The test boards were inspected visually, cleaned, and baked dry before application of solder mask. The various solder masks were applied and cured according to methods specified by the solder mask supplier. The solder masks tested are described in Table II. A typical insulation resistance determination is performed by placing five test boards in the test fixture and following the measurement procedure. The test fixture is sealed in the humidity chamber and placed in the oven. The specified conditions (Table I) are controlled by the oven temperature. 

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