Sensor Packages

●Hermeticity: Must meet airtightness requirement of ≤1×10-3Pa·cm3/s as demonstrated during fluctuating high pressure test.

●Insulation: Insulation resistance between the lead and the housing must be equal to or more than 1×109Ω

●Bonding: Inner wire bonding

●Solderability: •Properties such as easy solderability of the shell surface.


Sensor headers must withstand harsh environments characterized by physical stresses such as mechanical pressing, thermal shock, and vibration while the delicate electronics on the inside remain capable of consistently relaying information from its delicate electronics. These products typically adopt a compression sealing method. Seals are designed to withstand high pressure levels (up to 3000 bars) and therefore are very suitable for sensors that must endure this type of environment. Jitai’s stainless steel brazing helps form highly reliable GTM seals that can consistently perform in other challenging conditions characterized by repetitious action, irritants and acids,  and other harsh environments experienced in fields such environmental monitoring, medical, and automotive.

Product Design

In order to facilitate welding with the outer housing during use, the base of the stainless steel pressure sensor tube is generally round. Sensor packages generally consist of three parts, the housing, pins, and glass insulators. The housing and pins are fused and sealed through the glass insulators at high temperature. The main materials used are shown in Table 1 below:






Stainless Steel/Low Carbon Steel/4J29


Glass Insulator







Over the years we have finely tuned our multi-step process of ensuring every single component passes all quality and functionality tests, tests that begin even before raw materials are on-boarded.  At this first stage, each shipment of raw materials undergoes an acceptance sampling method assortment which makes a determination about whether to accept the material.  If such a determination is made, the entire shipment is cleaned, a full inspection is performed, minor imperfections are buffed and polished, and stock is then warehoused. The second stage is conducted immediately following the initial assembly and brazing stages. Every single product undergoes an individual visual inspection followed by a preliminary hermeticity test. For hermeticity we utilize a helium leak test that is adjusted to meet the exacting air tightness requirements of our clients. Following the plating stage, each batch undergoes a sampling inspection and a coating bonding degree analysis. Products that make it past this stage are then subjected to  full inspection which includes scrutiny of appearance, construction, plating thickness, and a second helium tracer gas hermeticity test. Finally products are put through the full range of Factory Inspection trials. These include pin fatigue tests, a salt spray corrosion resistance test and analysis that relies on climate simulation equipment to test product performance. Once products are approved, they are individually vacuum-packed with a deoxidizing desiccant insert and ensconced in additional protective packaging before being shipped out. These efforts guarantee that every Jitai product delivered to you is of the same high quality as when it left the factory.

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