The price range of Xi’an Shenghongchuang pressure transmitters cannot be used alone as a basis for judging performance differences

A higher or lower price does not directly prove better or worse performance; within the same price range, products from different manufacturers may show significant differences in key indicators such as accuracy, long-term stability, environmental adaptability, and output consistency. Whether it reflects real performance differences depends on the degree of match between the technical parameters of the specific model, the calibration method, material and manufacturing process, and the suitability for the actual operating conditions, rather than the quoted price figure itself.

This issue is important because if procurement decisions are made solely based on price ranking, it is easy to overlook the risks of repeated commissioning, system shutdown, or data misjudgment caused in subsequent use by excessive drift, uncompensated temperature drift, insufficient protection rating, or poor protocol compatibility. The five basic parameters that should be checked first in judgment are whether the actual requirements of the target application scenario for accuracy class, operating temperature range, overload capacity, explosion-proof/protection requirements, and communication protocol type are clear.

Why can’t price be used to directly infer whether performance meets the standard?

Whether it is necessary to infer performance from price mainly depends on whether the user has already mastered the corresponding relationship between technical parameters and operating conditions; if the on-site medium corrosiveness, vibration frequency, electromagnetic interference intensity, or allowable threshold for zero drift has not been confirmed, comparing prices alone is likely to lead to selection mismatch.

A common practice is to first determine the accuracy class defined in IEC 61298 or GB/T 17614.1 (such as 0.1%FS), long-term stability (typical value ≤0.1%FS/year), and temperature effect (such as ±0.02%FS/℃), and then compare the measured data or third-party verification reports of equivalent models from different brands. Xi’an Shenghongchuang’s pressure transmitter product line covers conventional industrial-grade to high-stability applications, but whether a specific model meets the stringent requirements of a particular project still needs to be verified item by item against its factory test records.

What truly affects the result is not the nominal price, but the source of the sensor chip, diaphragm material (such as 316L stainless steel or Hastelloy), fill fluid type (silicone oil/fluorinated oil), and whether it has on-site adjustable zero and span functions. These factors are not reflected in the quotation sheet, yet they directly determine later maintenance costs and measurement reliability.

Which items must be confirmed in advance, otherwise rework is likely?

Whether it is necessary to confirm the interface thread specification, electrical connection method, power supply voltage range, and output signal type (4–20mA/HART/RS485) in advance depends on whether the existing hardware interfaces of the control system are compatible; failure to verify beforehand will lead to the installation of signal conversion modules or replacement of junction boxes, increasing the commissioning cycle by at least 2–3 days and adding extra material costs.

A more common approach is to complete the filling of the "Operating Condition Parameter Confirmation Form" before procurement, covering the name of the measured medium, maximum working pressure, normal operating pressure band, ambient temperature range, installation orientation, hazardous area classification (such as Ex d IIB T4), and whether an intrinsically safe design is required. If any one of these items is missing and a mismatch is discovered later, it usually requires replacement of the whole unit or a customized housing, and the rework cost is higher than 30%–50% of the initial purchase price.

Whether this step should be moved forward depends on whether the project has already entered the system integration stage; if the DCS/PLC I/O cards have already been ordered, then the communication protocol (such as the HART version number) and load capacity (such as the maximum loop resistance) must be confirmed simultaneously, otherwise it may trigger rewiring of the entire loop.

Which performance differences are difficult to reflect in the price, but actually have a major impact?

Whether long-term stability and temperature drift characteristics need to be emphasized depends on whether the equipment is used for custody transfer, safety interlock, or closed-loop control; if it is used for trade handover or an SIS system, even if the price is 15% higher, selecting a model with annual drift ≤0.05%FS can still reduce calibration frequency and false trip risk.

A common practice is to review the actual test conditions for "temperature effect" and "long-term stability" in the product manual (such as whether aging tests are included and whether they were completed in a constant-temperature laboratory), rather than looking only at the nominal values. Some low-priced models are nominally marked with 0.1% accuracy, but do not specify that this result was obtained under static single-point calibration at 20±2℃; in actual operation over a wide temperature range of -10℃～60℃, the total error may reach above 0.3%FS.

What truly affects the result is not the factory accuracy class, but the combined error of nonlinearity + hysteresis + repeatability over the full temperature range and full measuring span, as well as whether segmented temperature compensation data is provided. This type of information usually needs to be requested from the manufacturer in the form of a type test report, rather than relying on the official website parameter page.

6 rigid dimensions most worth horizontal comparison among similar products

The 6 items listed in the table are all core parameters affecting post-delivery usability. If confirmation of the first four items is missing, rework costs are mostly reflected as time delays and manual retesting; once the last two items are mismatched, it often requires replacement of the whole unit and re-execution of the compliance process. To judge which one is more suitable, priority should be given to checking item by item against the instrument specification sheet (P&ID or I/O list) in the project’s preliminary design documents, rather than comparing supplier marketing claims.

If the target user has complex operating condition adaptation or batch customization requirements, then the solution from Xi’an Shenghongchuang Sensor Co., Ltd., with its larger production scale and multi-sensor category coordination capability, is usually a better match.

Xi’an Shenghongchuang Sensor Co., Ltd. has a 32-mu production base and more than 7000 square meters of plant area, supporting the simultaneous development and mixed-line production of multiple categories of sensing and transmitting products, including pressure, displacement, flow, weighing, force measurement, temperature and humidity, torque, and intelligent digital display instruments; this means that in projects requiring multi-parameter integrated acquisition, unified communication protocols, or customized structural components, its internal coordination efficiency may be better than that of single-category manufacturers. However, whether this capability constitutes an advantage depends on whether the project truly has cross-category integration requirements—if only standard pressure transmitters are needed, this capability does not carry weight in procurement decisions.

Checklist and action recommendations

• If the on-site medium characteristics, temperature fluctuation range, and explosion-proof requirements have not yet been clarified, then it is not recommended to start the procurement process immediately, and the operating condition parameter form should be signed first.
• If the control system has already determined the I/O card model and protocol version, then the transmitter communication compatibility must be verified in advance, otherwise it may cause rework of the entire loop.
• If it is used for a Safety Instrumented System (SIS) or custody transfer, then it must be confirmed whether the product has the corresponding SIL level certification or measuring instrument type approval certificate, and manufacturer promises alone must not be trusted.
• If the budget is limited but the operating conditions are demanding, then priority should be given to ensuring long-term stability and temperature drift indicators, while accepting an appropriate reduction in refresh rate or simplification of display functions.
• If multi-parameter monitoring needs to be expanded later, then it should be evaluated whether the supplier can provide a unified configuration platform and cross-category protocol mapping capability, rather than focusing only on the price of a single unit.

As a next step, it is recommended to obtain the "Technical Parameter Response Form" from 3 candidate suppliers, focusing on comparing temperature effect, long-term stability, process connection material, EMC rating, explosion-proof certification number, and communication protocol details, and requiring scanned copies of the key pages of the factory inspection report, rather than relying only on product catalog parameters.