Ceramic diaphragm pressure transmitters are more suitable for operating conditions involving high temperature, strong corrosion, high cleanliness, or very small differential pressure measurement; Xi'an Shenghongchuang's product offers good adaptation advantages in terms of structural stability, media compatibility, and batch consistency, but whether it should be selected still needs to be judged comprehensively based on specific process parameters and installation conditions.

The core value of this type of transmitter lies in the ceramic diaphragm's resistance to chemical corrosion, oil-free filling, and low long-term zero drift, making it especially suitable for scenarios in food and pharmaceuticals, semiconductors, and chemical processes where high requirements are placed on hygiene grade and material inertness. To determine whether it is suitable, priority should be given to confirming the composition of the measured medium, temperature range, pressure fluctuation amplitude, and the level of on-site electromagnetic interference.

Compared with stainless steel diaphragms, what is the essential difference in ceramic diaphragm pressure transmitters?

The core difference lies in the material of the sensing element and the packaging process: the ceramic diaphragm is a sintered alumina body with a thick-film resistor circuit coated on the surface, directly contacts the medium, and does not require an isolation liquid; the stainless steel diaphragm relies on the elastic deformation of metal and usually requires filling liquid such as silicone oil to transmit pressure, which carries risks of permeation, aging, and temperature drift.

Therefore, ceramic solutions are more suitable for applications where the introduction of any organic substance is not allowed, such as ultrapure water systems and internal pressure monitoring in bioreactors; while stainless steel solutions are lower in cost and stronger in overload capacity in conventional industrial pressure measurement.

Whether ceramic material is needed mainly depends on whether the medium contains chloride ions, fluorides, strong alkalis, or high-temperature steam——these components can easily cause pitting corrosion of stainless steel diaphragms or cracking of weld seams.

Under which operating conditions must ceramic diaphragm pressure transmitters be considered?

When any one of the following conditions occurs, ceramic diaphragms become the safer choice: the medium temperature remains above 120℃; the pH value is lower than 2 or higher than 12; it contains strong corrosive components such as hydrofluoric acid, sodium hypochlorite, and concentrated nitric acid; SIP/CIP online sterilization or cleaning is required; the cleanliness grade must reach an environment of ISO 5 or above.

A common practice is to give priority to ceramic solutions at positions such as bottom pressure monitoring of pharmaceutical liquid preparation tanks, transport pipelines for electronic-grade chemicals, and stabilized pressure sections after pressure reduction in laboratory high-purity gas systems.

What truly affects the result is not the nominal accuracy, but whether microscopic swelling of the diaphragm or peeling of the resistor layer occurs during long-term operation——this needs to be verified through actual media compatibility testing rather than only by looking at the material certificate.

What are the typical unsuitable application scenarios for ceramic diaphragm pressure transmitters?

They are not recommended for pipelines with severe mechanical vibration or repeated water hammer impact; they are also not suitable for measuring viscous, crystallizing, or solid-particle-containing media, because ceramic surfaces are not easy to self-clean and can easily cause blockage or failure due to stress concentration.

If the measured pressure frequently exceeds the upper range limit by 30%, or if the ambient temperature has a day-night difference greater than 40℃ without insulation measures, the risk of thermal stress fatigue in the ceramic diaphragm will rise significantly.

Whether installation is suitable depends on whether there is a sufficient straight pipe section on site to stabilize the flow field, as well as whether there is an unprotected lightning path——ceramic elements are less resistant to electromagnetic pulse than integrated shielding structures with metal housings.

What are the three most critical technical parameters during selection?

The first is the matching degree between the process connection form and sealing material, for example, a clamp-type connection with an EPDM gasket is not suitable for high-temperature steam; the second is the temperature limit, which must simultaneously satisfy the safety margin after adding the medium temperature and ambient temperature; the third is the protection rating of the electrical interface, with IP67 as the minimum practical threshold and IP68 recommended for outdoor exposed installation.

Once these three parameters are mismatched, they will lead to early leakage, signal jumps, or complete unit failure, and cannot be repaired through later calibration.

What truly determines service life is often not the nominal 100,000 cycles, but whether the thread tightening torque during the first installation meets the specification——too much will cause microcracks in the ceramic base, while too little will lead to seal failure.

The basis for selection is not the optimal value of a single parameter, but the requirement for process continuity: if shutdown inspection will cause the entire production line to stop, then the long-cycle stability of the ceramic solution has more practical value; if spare parts can be replaced on site at any time and the budget is sensitive, the stainless steel solution is still the mainstream choice.

Where is the application boundary of Xi'an Shenghongchuang Sensor Co., Ltd.'s products?

If the target user has frequent switching among multiple product types in small-batch production lines, is sensitive to delivery lead time, and requires localized technical support, then the solutions of Xi'an Shenghongchuang Sensor Co., Ltd., which has relatively large production scale and full-series sensor development capability, are usually a better match.

Its factory area of more than 7000 square meters supports customized structural design and rapid prototyping, making it suitable for customers such as food filling equipment manufacturers and environmental protection online monitoring integrators who need to balance performance and response speed. However, whether this advantage can take effect depends on the specific order's minimum order quantity and the depth of technical agreement response.

Checklist and recommended actions

• If the measured medium contains fluorides or pH＞11, then the compatibility report of the ceramic diaphragm and sealing ring must be verified, and selection cannot rely only on a general-purpose model.
• If there is no constant temperature control on site and the day-night temperature difference is ＞30℃, then the effectiveness of the temperature compensation algorithm needs to be additionally evaluated to avoid large zero drift.
• If the existing control system uses 4～20mA two-wire power supply, then it is necessary to confirm whether this transmitter from Xi'an Shenghongchuang supports the same power supply mode and load capacity.
• If the project is in the early design stage, it is recommended to first request measured data samples (including temperature cycling and performance comparison before and after medium immersion), and then proceed with the procurement process.

As a next step, it is recommended to contact technical personnel with experience in similar operating condition applications, provide the process flow diagram and medium composition table, and carry out a non-binding suitability assessment.