The Important Performance Of Waterproof Connectors
The waterproof connector has three major performance: environmental performance, mechanical performance, and electrical performance.
1. Environmental performance
Common environmental performance, including temperature, moisture, salt spray, vibration and shock.
Temperature: the current maximum working temperature of the waterproof connector is 200 ℃ (except for a few high temperature special waterproof connector), the minimum temperature of -65 ℃.
As the waterproof connector work, the current at the contact point to generate heat, resulting in temperature rise, it is generally believed that the operating temperature should be equal to the ambient temperature and contact temperature rise and.
Waterproof Connectors In some specifications, the maximum permissible temperature rise of the waterproof connector at rated operating current is specified.
Salt resistance: waterproof connector in the environment containing moisture and salt work, the metal structure, the contact surface treatment layer may produce electrochemical corrosion, affecting the physical and electrical properties of waterproof connectors.
In order to evaluate the ability of the waterproof connector to withstand this environment, a salt spray test was specified. It is the waterproof connector suspended in the temperature controlled test chamber, with the specified concentration of sodium chloride solution with compressed air spray to form salt mist atmosphere, Waterproof Connectors the exposure time by product specifications, at least 48 hours.
Vibration and Shock: Vibration and shock resistance is an important feature of electrical waterproof connectors that are particularly important in special applications such as aerospace and aerospace, railways and road transport. It is a test of the robustness and electrical power of electrical waterproof connectors.
Waterproof Connectors Important indicators of contact reliability. In the relevant test methods are clearly defined. The impact test should specify the peak acceleration, duration and impact pulse waveform, and electrical continuity of the time.
Waterproof Connectors Moisture resistant moisture intrusion will affect the connection h insulation performance, and corrosion of metal parts.
Constant humidity test conditions for the relative humidity of 90% to 95% (according to product specifications, up to 98%), temperature +40 ± 20 ℃, test time by product, at least 96 hours. Alternating hot and humid test is more stringent.
2. mechanical performance
the mechanical properties of the connection function, the insertion force is an important mechanical properties. Insertion force is divided into insertion force and pull out force (pull force also known as separation force), the two requirements are different.
The maximum insertion force and the minimum separation force in the relevant standard, which indicates that the insertion force is small from the point of view of use (thus having a low insertion force LIF and a non-insertion force ZIF structure) and the separation force is too small, Waterproof Connectors It will affect the reliability of contact.
Another important mechanical property is the mechanical life of the waterproof connector. Mechanical life is actually a durability (durability) indicators, in the national standard GB5095 it is called mechanical operation.
It is a single insert and a pull out as a cycle to the provisions of the plug-in cycle after the waterproof connector can normally complete its connection function (such as contact resistance) as a basis for judging.
The pull-out force and mechanical life of the waterproof connector are related to the contact quality (sliding friction coefficient) of the contact part of the contact structure (positive pressure) and the dimensional accuracy (alignment) of the contact arrangement.
3. Electrical performance
The main electrical performance of the waterproof connector includes contact resistance, Waterproof Connectors insulation resistance and electrical strength.
① Insulation resistance measures the insulation performance between the waterproof connector connector and between the contact and the enclosure, which is of the order of several hundred megohms to several gigahertz.
② resistance to electrical strength or resistance to voltage, dielectric pressure, Waterproof Connectors is to characterize the waterproof connector between the contacts or between the contact with the shell to withstand the rated test voltage capacity.
③ contact resistance High quality electric waterproof connector should have a low and stable contact resistance. Waterproof Connectors The contact resistance of the waterproof connector ranges from a few milliohms to several tens of milliohms.