How To Pressure Gauge Purchase Pitfall Avoidance Guide ？

        The procurement of pressure gauges may seem simple, but in fact, there are numerous technical details involved. If you're not careful, you might easily fall into traps. Based on years of industry experience, I have compiled a systematic guide to avoid common pitfalls in the procurement process, helping you avoid the typical problems encountered during the purchase:                            
                                    
I.Clear technical parameters: Avoid choosing the wrong model                                    
                                    
1. Core parameters must be fixed: name and type, range and accuracy, installation and connection.                                    
    Name and Type:Distinguish between general pressure gauges, ammonia pressure gauges, shock-resistant pressure gauges, diaphragm pressure gauges, pressure transmitters, temperature transmitters, flow meters, level meters, etc. Incorrect selection will directly lead to the inability to use.                                
    Range and Accuracy: A too-small range is prone to overpressure damage, while a too-large range leads to insufficient accuracy (for example, when the actual pressure is 0.5 MPa, choosing 0~1.6 MPa is more accurate than 0~10 MPa). The accuracy grade can be selected as 1.0 grade (high precision) or 1.6/2.5 grades (conventional).                                
    Installation and Connection:Installation and Interface: Clearly specify radial/axial installation and thread specifications (such as M14×1.5), otherwise assembly may not be possible.                                
                                    
2. Special working conditions require additional configurations: corrosive ambient, vibration scenarios, high/low temperatures.                                    
    Corrosive Ambient:When in contact with media such as chloride ions, 316L stainless steel must be chosen instead of 304 (the latter is prone to corrosion).                                
    Vibration Scenarios:The anti-seismic pressure gauge needs to be filled with silicone oil or glycerin (shock-absorbing liquid), otherwise the pointer will shake and the reading will be inaccurate.                                
    High/ Low Temperature:Confirm the working temperature range (such as -40℃ to 200℃). Ordinary thermometers may fail under extreme temperatures.                             
                                    
3. Quick Reference Table of Key Parameters:            

II.Supplier Selection: Avoid Poor-Quality Suppliers                                        
    · Registered capital > 500,000RMB and the manufacturer is preferred.                                    
    ·It is required to provide the product's factory certificate of conformity, standards, and batch number.                                    
    ·Physical comparison:                                    
    Comparison of the same model from different brands: Weigh the product (the cheaper models are lighter), examine the craftsmanship (check if the interface is smooth and free of burrs, and whether the dial is clear).                                    
                                        
III.Contract and Delivery Management: Preventing Future Disputes.                                        
    ·Price terms: Specify the payment terms in the contract or proforma invoice as follows: Telegraphic Transfer (TT), Letter of Credit (L/C), Documents against Payment (D/P), Documents against Acceptance (D/A), Western Union Transfer, Credit Sale (O/A), or Cash Advance.                                    
    "·Delivery details:
Specify the delivery time and location (such as the logistics company's warehouse), and sign and confirm the records for batch deliveries."                                    
    ·Default Clause: Model substitution must be confirmed by the buyer in writing. Suppliers are prohibited from substituting models with lower specifications without authorization, which shall be deemed a breach of contract.                                    
                                        
IV.Common Misunderstandings and Countermeasures                                        
   ·Misconception 1:
The low-price table often uses low-quality spring tubes or sensor components with short lifespan (such as failing the inspection after only one cycle of use). Solution: Balance cost and quality, choose mid-range priced brands (such as Huihua brand)."                                    
Solution: Balance cost and quality, choose mid-range priced brands (such as Huihua brand).                            
    · Misconception 2: Ignoring medium characteristics
→ Using ammonia pressure gauges in an ammonia environment led to corrosion and leakage; failing to degrease the oxygen gauges caused an explosion. Solution: Special media must be equipped with dedicated gauges.                                 
    ·Misconception 3: Ambiguous Brand Information
The contract only specifies ""pressure gauge"" without specifying the model. The supplier has substituted inferior products. The solution: The model, material, and standards should be listed item by item in the contract (for example, ""YF-100-1.6MPA-M14×1.5, 316L stainless steel"").·Misconception 3: Ambiguous Brand Information                                              
Summary: The core of pressure gauge procurement is "no compromise on technical details, complete documents before payment", maintaining highly effective communication with suppliers, and using a combination of pictures and text in communication is preferred. Finally, I hope this pressure gauge procurement guide can be helpful to you, the purchaser. At the same time, these are merely my personal opinions. If there are any omissions of information, I welcome professional purchasers to leave messages for me to supplement.