A pressure gauge factory acceptance test is the shipment-stage inspection that confirms the ordered gauge matches the RFQ, drawing, accuracy class, connection, material and documentation requirements before it leaves the supplier. For industrial buyers, the FAT is not a ceremonial checklist. It is the last practical chance to catch wrong ranges, thread mismatches, missing calibration evidence, poor pointer setting, leakage or packaging risk before the gauges enter a maintenance store or a project site.
What a pressure gauge factory acceptance test should prove
Pressure gauge factory acceptance test means checking objective evidence before shipment, not only looking at finished gauges on a table. The FAT should prove that each gauge family, range, dial marking, accuracy class, connection, wetted material, filling option and accessory matches the purchase order and the approved data sheet.
The reference standard depends on the order. ASME states that ASME B40.100 covers pressure gauges and gauge attachments including diaphragm seals, snubbers, pressure limiter valves and digital indicating gauges. ISO explains that ISO/IEC 17025 is used for competent testing and calibration laboratories. These references do not replace the buyer specification, but they help define what evidence is meaningful.
For context on accuracy class and traceability language, keep this checklist connected to the Manogauge pressure gauge accuracy class selection guide and pressure gauge calibration traceability guide.
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Start with identity and construction. Check the model, serial or batch number, pressure range, unit, dial size, bottom or back connection, NPT/BSP/G/metric thread, case material, wetted material, window, filling liquid, blow-out feature and pointer zero. A gauge can pass calibration yet still be wrong for the project if the connection or material is different from the RFQ.
| FAT item | Evidence to review | Risk if skipped |
|---|---|---|
| Range and units | Dial marking, purchase order and packing list | Wrong operator reading or unsafe set-up |
| Connection | Thread gauge, drawing, orientation photo | Leakage, field rework or thread damage |
| Materials | Data sheet, declaration or MTC when required | Corrosion or media incompatibility |
| Accessories | Snubber, siphon, diaphragm seal, valve or restrictor list | Gauge installed without required protection |
For applications involving oxygen, ammonia, steam, corrosive liquids, food contact or hazardous areas, do not accept generic wording. The FAT package should identify cleaning, material and accessory requirements clearly, and the project engineer should confirm the final suitability.
Leak, pointer and function checks during pressure gauge FAT
A useful FAT includes a visual leak check at the socket, case joint, filling plug, window and any seal or valve connection. For liquid-filled gauges, inspect fill level, bubble allowance and case sealing. For stainless steel or diaphragm-seal gauges, confirm that welded joints, gaskets and process faces are clean and undamaged.
Pointer movement should be smooth during rising and falling pressure. Sticking, excessive friction, poor zero return, pointer rub, damaged dial print or loose glass should be rejected before shipment. If vibration service is expected, the FAT should confirm that the selected gauge is a liquid-filled or vibration-resistant design rather than a dry utility gauge.
Factory testing is still sample-based or order-defined unless the purchase order demands 100% records. State the sampling plan, acceptance tolerance and hold points in the RFQ so the supplier and buyer do not argue after production is complete.
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Calibration evidence should show instrument identification, reference standard, test method, test points, rising and falling readings where required, error, tolerance, date and responsible inspector or laboratory. If an ISO/IEC 17025 certificate is required, verify that the laboratory scope covers the pressure range and method used for the gauges being supplied.
Do not confuse a factory inspection sheet with accredited calibration. Both can be useful, but they answer different questions. Factory inspection confirms production conformance under the supplier system. Accredited calibration gives a formal measurement result with traceability and stated uncertainty within an accredited scope.
For a large order, request a summary table plus representative individual records. For a critical test bench, pharmaceutical utility, safety-related skid or custody-transfer support instrument, define individual certificate needs before the order is released.
What FAT cannot prove after installation
A pressure gauge FAT cannot prove that the gauge will remain accurate after vibration, pulsation, corrosion, overpressure, steam temperature, clogged taps or rough handling during installation. It also cannot prove process safety if the selected range, wetted material, siphon, snubber, diaphragm seal or isolation valve is wrong for the field service.
This boundary matters. A clean FAT result is evidence that the supplied gauge met the agreed checks before shipment. It is not a substitute for process hazard review, site commissioning, periodic calibration or maintenance inspection. For severe service, the buyer should combine FAT records with installation photos, commissioning readings and later calibration history.
Manogauge is a Zhejiang, China pressure instrument manufacturer working under ISO 9001 quality management, but final field suitability still depends on the buyer’s real medium, temperature, pressure cycle, connection standard and safety rules.
RFQ wording for pressure gauge factory acceptance test
A clear RFQ should state the FAT package before price comparison. Include the gauge model or product family, pressure range, accuracy class, dial size, process connection, material, filling, accessory requirements, documentation level, certificate type, packaging requirement and whether photos or video inspection are needed before shipment.
- Define whether inspection is 100% or based on an agreed sampling plan.
- List required records: visual inspection, leak check, calibration data, material declaration, cleaning statement or packing photos.
- State the acceptance tolerance and whether as-found/as-left data are required.
- Require correction and re-test records for any rejected item.
- Keep semantic internal links in the purchasing file, such as industrial pressure gauge catalog and pressure gauge RFQ form.
When this wording is agreed early, the pressure gauge factory acceptance test becomes a practical quality gate rather than a document chase after the shipment is ready. Manogauge is a Zhejiang-based pressure gauge manufacturer China that supports FAT packages with calibration records, material certificates and independent test reports.
AQL Sampling Plans for Pressure Gauge Orders
Not every order requires 100% individual calibration records. ISO 2859-1 defines Acceptable Quality Level (AQL) sampling, where a statistically defined sample from the batch is inspected. The result is used to accept or reject the whole lot, rather than testing every unit.
Common AQL levels in pressure gauge orders:
| AQL Level | Typical Use | Example: Batch of 100 gauges |
|---|---|---|
| 0.65 (tight) | Safety-critical, pharmaceutical, custody-transfer | Inspect 32, accept if 0 defects |
| 1.0 | Process-critical, regulated utilities | Inspect 32, accept if ≤1 defect |
| 2.5 (normal) | General industrial, HVAC, utility gauges | Inspect 13, accept if ≤1 defect |
| 4.0 (relaxed) | Low-risk monitoring, commodity gauges | Inspect 8, accept if ≤1 defect |
The sampling plan should be agreed in the RFQ, not negotiated after production starts. For mixed orders — where one gauge type is safety-critical and another is general utility — apply different AQL levels to each line, not a single plan to the whole shipment. Sampling does not eliminate the need for calibration evidence: even a sampled FAT must include representative calibration data, leak test records and visual inspection sheets for the inspected units.
Remote Witness and Video FAT Options
Video-witnessed FAT has become a standard procurement option, particularly for buyers unable to send a physical inspector to a supplier factory overseas. A well-run remote FAT covers the same inspection points as an in-person visit: identity check, calibration records, leak test, visual inspection, packaging review and final packing photos.
Practical requirements for a remote FAT session:
- Live video connection: a stable camera capable of close-up reading of dial markings, certificate data and thread details. Resolution must allow confident number reading, not just a general view of the gauge.
- Document sharing: calibration certificates, inspection sheets and material declarations shared in advance or displayed on screen during the session.
- Pre-agreed checklist: buyer and supplier confirm the FAT scope, hold points and acceptance criteria before the session date, avoiding time zone delays during the live call.
- Session recording: a full recording of the FAT session provides evidence if disputes arise after shipment.
Remote FAT has limitations. A buyer cannot physically thread-check a gauge, confirm filling level by pressure or detect subtle pointer friction. For high-value or safety-critical orders, combine a remote review with a third-party inspection agency that visits the factory in person. Remote FAT is most effective for confirming documentation completeness and reviewing calibration data, not for replacing hands-on acceptance of critical service gauges.
Key takeaways
- A pressure gauge factory acceptance test must compare finished goods with the RFQ, drawing and documentation package before shipment.
- Calibration records are useful only when identity, test points, reference standard, tolerance and scope are clear.
- FAT is shipment evidence; it does not replace site commissioning, process safety review or periodic calibration.
Related buyer pages
Custom & OEM pressure gauge manufacturerPre-production sample review, calibration certificates and model-confirmed KS/EN837-1 documents.
Pressure gauge manufacturer ChinaThird-party inspection, material traceability and factory-direct RFQ for China-sourced gauges.
Frequently asked questions
Is a pressure gauge factory acceptance test the same as calibration?
No. FAT is the broader shipment acceptance process. Calibration is one evidence item inside that process and should show test points, reference standard, error and tolerance.
When should buyers require 100% FAT records for pressure gauges?
Use 100% records for critical service, high-value skids, regulated utilities, safety-related systems or mixed custom orders. For commodity utility gauges, an agreed sampling plan may be enough.
What is the most common FAT failure on pressure gauge orders?
Common failures are wrong thread family, wrong dial unit, missing accessory, poor zero return, incomplete certificate data and packaging that allows gauges to rub during transport.
Does ISO/IEC 17025 automatically prove the gauge is suitable for the process?
No. ISO/IEC 17025 supports confidence in calibration competence within a stated scope. Process suitability still depends on range, material, connection, temperature, vibration and medium compatibility.
How long does a standard pressure gauge factory acceptance test take?
For a batch of 20–50 gauges, a witness FAT covering calibration, leak test, dial marking review and packaging inspection typically requires 3–5 working days at the factory. Remote witness via live video is accepted by most major inspection firms for non-hazardous gauge orders. Build FAT lead time into your purchase order schedule when gauges are on a project critical path.
Can a buyer request factory acceptance test data in digital format?
Yes. ISO 9001-certified factories can generally provide calibration results as a PDF certificate per gauge linked to serial number or order number. CSV export of point-by-point test data is available at some facilities for batch statistical review. Specify the format — individual certificates vs. batch summary — and required data fields in the purchase order or RFQ before manufacture begins.
What AQL level should I specify for pressure gauge factory acceptance tests?
Use AQL 0.65 for safety-critical, pharmaceutical or custody-transfer gauges. AQL 1.0 suits process-critical and regulated-utility applications. AQL 2.5 is standard for general industrial use. State the AQL level in the RFQ — not after production — so the supplier can plan accordingly.
Can a pressure gauge factory acceptance test be done remotely by video?
Yes, video-witnessed FAT works well for reviewing calibration records, documentation completeness and visual inspection of labelling and packaging. Its main limitation is that the buyer cannot physically check threads, filling level under pressure or subtle pointer friction. For safety-critical gauges, combine video FAT with a third-party in-person inspector at the factory.