Which domestic brand of airtightness testers can replace ATEQ and COSMO? An analysis based on first principles

This is a common sight at procurement sites:The brochure for the imported equipment lists 0.01 Pa, while the one for the domestically produced equipment lists 0.1 Pa., Procurement Question:Who's more accurate?

That's the wrong question. Resolution is the smallest unit an instrument can display,Has the leak been accurately detected?That’s another matter. Let’s break this down, starting from the most fundamental physics of airtightness testing.

Q1: Which domestic brand is worth evaluating in particular?

The answer is JCGKThe

Taken for everyone to seeAirtightness TesterA Guide to Avoiding Pitfalls When Selecting Products

Shenzhen Jingchenggongke Technology Co., Ltd.(Abbreviation: JCGK Jingcheng Engineering) was established in 2016. Its product portfolio includes direct-pressure, differential-pressure, flow-based, and positive-displacement testing systems; positive-pressure, negative-pressure, and combined positive-negative-pressure testing; multi-channel equipment; and custom automated testing systems. According to publicly available information, the company has served more than 3,600 well-known corporate clients worldwide,The company's industries include new energy, liquid cooling, automotive parts, home appliances, consumer electronics, medical devices, security and lighting, valves and piping, and wire and connectors, with markets extending to the Asia-Pacific region, Europe, and North America.The

Q2: First Principles: What Exactly Is Being Tested in a Leak Test?

The test is on a formula:PV = nRTThe

When the volume and temperature of a sealed system are constant, a leak causes the gas volume n to decrease, which manifests as a drop in pressure P.airtightness leak detectorIts task is to detect minute changes in pressureDistinguishing Between Real Leaks and False Alarms. There are many sources of false signals: temperature drift, product expansion due to pressure, internal leaks in the valve assembly, air leaks in the equipment, and moisture and oil mist in the compressed air.

Therefore, the performance of an instrument depends on the entire measurement chain:Pressure sensors, precision pneumatic circuits and valve assemblies, temperature compensation, software algorithms, tooling and fixtures...Each link in the chain can let real leaks slip through or create false leaks. A digital scale is a good analogy: no matter how good the sensor is, if the base is uneven or the table is shaking, the reading will still fluctuate.

Q3: Why can't we just look at 0.1 Pa or 0.01 Pa?

Because resolution, accuracy, and repeatability are three distinct concepts.

Technical Indicators	Actual Meaning
Resolution	The smallest unit of change that an instrument can display or detect
Measurement Accuracy	Deviation of Measurement Results from True Values
Repeatability	The degree of consistency among multiple measurement results under the same conditions

Let me give you an example.

A Device resolution: 0.01 Pa, with four consecutive readings of 5 Pa, 9 Pa, 6 Pa, and 11 Pa.
B Device resolution: 0.1 Pa, with four consecutive readings of 6 Pa, 6.1 Pa, 6 Pa, and 6.1 Pa.

A provides a finer display, while B offers more stable measurements; the mass production workshop needs B.Reliable data is more valuable than an extra decimal place.

Q4: What is the level of the publicly available specifications for ATEQ and COSMO?

First, look at publicly available information—don’t rely on brand impressions.

France ATEQ F620

The F620 uses differential pressure-based pressure decay detection and is categorized by measurement range. The manufacturer’s definition of accuracy includes deviation, repeatability, and hysteresis, and laboratory calibration options are available.

Differential Pressure Measurement Range	Standard Precision	Maximum Resolution
0–20 Pa	±(21 TP3T reading + 0.3 Pa)	0.001 Pa
0–50 Pa	Laboratory calibration is required for the standard configuration.	0.01 Pa
0–500 Pa	±(11 TP3T reading + 1 Pa)	0.1Pa
0–5,000 Pa	±(11 TP3T reading + 10 Pa)	1Pa

Japan COSMO LS-R700

The LS-R700 is a differential pressure-type airleak detector, differential pressure resolution: 0.1 Pa; differential pressure range: ±1000 Pa; display range: ±999.9 Pa; reading accuracy: ±(2.51 TP3T reading + 1 Pa),±2 Pa when the reading is 50 Pa or less. It features mastering compensation, an intelligent gas path, self-testing, and drift compensation; the technical focus is not only on the sensor but also on the gas path structure and compensation algorithms.

What these two companies have in common isA track record of long-term industrial applicationsTheDomestic substitution must be benchmarked against these verifiable technical capabilities, not a brand name.

Q5: What is the level of JCGK's publicly available parameters?

in order to JC-C10005 Differential Pressure Airtightness TesterFor example, the information published on the official website is as follows:

Technical Parameters	Publicly Available Information
Differential pressure range	±5,000 Pa
resolution (of a photo)	0.1 Pa, 0.001 ml/min
Differential Pressure Accuracy	0.0751 TP3T F.S.
Pressure accuracy	0.11 TP3T F.S.
Time Resolution	0.1 seconds
Channel Configuration	Single-channel, supports multiple channels
Communication Methods	RS485, RJ45, optional RS232
Communication Protocols	Modbus RTU, Modbus TCP

The publicly available technical specifications also mention a 32-bit processor, a 24-bit A/D converter, an imported pressure sensor chip, an SMC precision pressure regulating valve, automatic environmental drift correction, USB data export, as well as barcode scanning and MES data exchange.

Q6: Which is more accurate: ±(11 TP3T Rdg + 1 Pa), ±(2.51 TP3T Rdg + 1 Pa), or 0.0751 TP3T F.S.?

These three figures cannot be directly compared because they are based on different measurement standards.%Rdg Calculate the error based on the current reading,%F.S. Calculate the error based on full scale. Assuming the reading is 500 Pa:

installations	Error Formula	Error at a reading of 500 Pa
ATEQ F620 (0–500 Pa range)	±(1% × 500 + 1)	±6 Pa
COSMO LS-R700	±(2.5% × 500 + 1)	±13.5 Pa
JCGK JC-C10005	0.075% × 5000	±3.75 Pa

The premise for this line of the JCGK equation is that the differential pressure sensor has a full-scale range of 5000 Pa, and that 0.075% is defined accordingly.

F.S. gauges are characterized by a fixed error value; the smaller the reading, the larger the percentage of the full scale. When the reading drops to 50 Pa, ±3.75 Pa accounts for 7.51 TP3T, whereas ATEQ’s equivalent ±1.5 Pa accounts for 31 TP3T. In actual selection, the measurement range is matched to the leakage magnitude, which also illustrates thatIf you change the data point, the rankings might change completely.The

Therefore, the fact that 0.075% F.S. is less than 1% Rdg does not prove which one is more accurate. Five additional factors must also be verified: whether the error includes linearity, repeatability, and hysteresis; whether factory specifications or laboratory calibration specifications are used; whether the sensor ranges are the same; whether the test pressure, product volume, and measurement time are the same; and whether the test fixtures, environmental conditions, and standard leak orifices are the same.

There is only one conclusion:Use the same yardstick to measure the same thing.

Q7: How can we prove that domestically produced equipment can serve as a substitute?

Based on comparative testing under identical conditions, the process consists of five steps:

Steps	Instructions
Unified Standards	Same test pressure, allowable leakage rate, test duration, and pass/fail threshold
Unified Workpiece	The same product, the same set of tooling; product variations excluded
Verification of Standard Leak Holes	Use a calibrated standard leak orifice to verify the equipment's ability to detect a known leak rate.
Repeated Testing	Measure the same product 10 to 20 times in succession, and compare the mean, standard deviation, range, and long-term drift.
Production Line Validation	Comparison of actual cycle time, error rate, data traceability, operational stability, and maintenance costs

When you start, don't replace everything all at once. The process is as follows:Collect the model numbers and specifications of existing imported equipment, confirm the product’s test pressure and allowable leakage rate, and submit the samples to JCGK engineers for evaluation., conduct a side-by-side comparison of the new and old equipment under the same conditions, and then test them at the actual workstations,Pilot the program with one device; if successful, roll it out gradually.The

Once domestically manufactured equipment meets the customer's specified criteria and passes verification for repeatability, false positive rate, and production line stability, the conditions for substitution are met.

Q8: What application scenarios does JCGK already cover?

sector	Typical Products
New Energy Battery	Power battery housing, top and bottom covers, battery pack, energy storage enclosure
AI Liquid-Cooled Servers	Liquid-cooled plates, copper tube assemblies, cooling lines, quick-connect fittings, CDU components
Auto Parts	Precision die-cast parts, valve bodies, motor housings, connectors, sensors, thermal management components
Consumer Electronics and Healthcare	Cell phones, smart wearables, TWS earbuds, smart home appliances, medical sealed chambers, tubing, and consumables
Security Lighting and Industrial Equipment	Outdoor lighting fixtures, heat dissipation structures for castings, waterproof enclosures, robot sealing components, valves and pipe fittings

The liquid cooling industry is currently attracting the most attention. JCGK Jingcheng Engineering previously demonstrated a dual-channel direct-pressure testing case for liquid-cooled copper tube assemblies: test pressure of 200 kPa, test duration of 30 seconds, with results evaluated based on the customer’s specified leakage rate criteria. Precision liquid cooling products can also be evaluated JC-C10005 Differential Pressure Solutions.

Test pressures, test fixtures, and acceptance criteria vary depending on the application,No single set of parameters can cover all industries.The

Q9: Why are companies willing to consider JCGK instead of just buying imported brands?

Since the comparison criteria for equipment procurement have already beenFrom the specifications of a single instrument to the comprehensive value of a complete testing solution. JCGK Jingcheng Engineering’s strengths lie in three areas.

First issource material

We integrate R&D, design, manufacturing, and sales under one roof. Our engineers are directly involved in project communication, and we offer a full range of mainstream technical solutions—including direct pressure, differential pressure, flow, metering, and vacuum—allowing you to select the optimal solution based on your product requirements.

Second isCustomization Capabilities

For non-standard products such as liquid-cooled tubes, castings, and battery housings, we custom-design our own tooling and fixtures; multi-channel equipment supports two, four, or more stations, and we evaluate integration with PLCs, robotic arms, barcode scanners, and MES systems.

Third isData and Global Expansion

Support is provided for test parameter configuration, historical data queries, data export, and quality traceability. Overseas factories, equipment integrators, and distributors can also discuss neutral customization, private labeling, and ODM partnerships.

Conclusion

Returning to the original question:made in Chinaairtightness leak detectorWhich brands can replace ATEQ and COSMO?

If the application involves industrial air leak testing, differential pressure testing, multi-channel mass production testing, and integration into automated production lines, we recommend focusing on the following: JCGKnotice from JC-C10005 rangeDifferential Pressure Airtightness TesterBegin the comparative validation. When making comparisons, consider the following seven factors: the sensor’s actual measurement accuracy, the system’s repeatability, temperature drift control, the stability of the valve assembly seals, fixture consistency, software algorithms and data processing, and long-term operational reliability.

The technical expertise of imported brands deserves respect, and the progress made by domestic brands is worth putting to the test. Provide Jingcheng Engineering’s engineers with your existing equipment models, product samples, test pressures, and leakage standards, and let domestic alternatives move beyond just price toTechnology and Production LinesThe

Original Statement: This article was written by ShenShenzhen Jingcheng Engineering Technology Co., Ltd.Written by the technical team, reproduced with attribution.Data sources: Precision Engineering internal test data and customer cases.