Pressure Gauge Selection

Pressure Gauge Selection

 

I. Recommended Core Parameter Matching

Parameter Category Required Value Recommended Model Features

Type: Bourdon-type pressure gauge. Utilizes a single-turn spring tube construction for high sensitivity, suitable for low-pressure applications (0-2.5 bar).

Range: 0-2.5 bar. Recommended range: 0-4 bar (actual range: no more than 2/3 of full scale, or 1.67 bar, with a safety margin).

Accuracy: Class 1 (±1% full-scale deviation). Industrial-grade standard, compliant with GB/T1226-2010, suitable for general process control.

Window Material: Methacrylate. Impact and UV resistance, with a transmittance of ≥90%, superior to ordinary glass.

Process Connection: 1/2" NPT male thread. Vertical mounting design. Thread accuracy complies with ASME B1.20.1 to prevent leaks.

Pressure Element Material: 316 stainless steel (Monel alternative). Better corrosion resistance than 304 stainless steel. Suitable for seawater and mild acid environments. Cost is 40% lower than Monel.

Ingress Protection: IP67 Dustproof and waterproof, it can withstand temporary immersion in water (1 meter for 30 minutes), making it suitable for outdoor and humid environments. Filling fluid: glycerin or silicone oil. This reduces vibration and noise, preventing excessive pointer fluctuation. Glycerin is suitable for temperatures between -20°C and 60°C, while silicone oil is suitable for temperatures between -40°C and 150°C. Housing: Front-opening with explosion-proof rubber ring for easy on-site calibration. The rubber ring complies with EN60079-0 explosion-proof standards and has a flame retardancy rating of V-0. Housing material: SS304 (304 stainless steel), which offers moderate corrosion resistance and is less expensive than 316 stainless steel. It is suitable for non-corrosive media. Seal material: FPM/FKM/PTFE FPM (fluororubber) is resistant to high temperatures (200°C), FKM (fluorocarbon rubber) is chemically resistant, and PTFE (polytetrafluoroethylene) is resistant to strong acids and alkalis.

 

II. In-depth Analysis of Key Parameters

 

Range Selection Logic

 

Safety Margin: The actual operating pressure should be controlled between 1/3 and 2/3 of the range (i.e., 0.83 to 1.67 bar) to prevent fatigue caused by prolonged high stress on the spring tube.

 

Overload Protection: The recommended range is 0-4 bar, and it can withstand short-term overpressure up to 6 bar (1.5 times the range), complying with ASME B40.100 standards.

 

Material Alternatives: Monel Alternatives when 400 is unavailable: 316 stainless steel has better corrosion resistance in chloride environments than 304, but less than Monel. If the medium contains high concentrations of chloride ions (such as seawater), the calibration interval should be shortened to 3 months.

 

Seal Material Options:

FPM: Suitable for high-temperature media (such as steam) below 150°C.

FKM: Suitable for environments with strong acids and organic solvents (such as sulfuric acid and diesel).

PTFE: Suitable for highly corrosive media such as concentrated sulfuric acid and sodium hydroxide.

 

Measured Protection Rating Data

IP67 certification requires passing IEC 60529 testing, including:

Dustproof: No dust can enter the housing.

Waterproof: No water can enter the housing after immersion in 1 meter of water for 30 minutes.

In actual applications, it is recommended to install a rain cover (for outdoor installation) to extend the life.

 

For specific selection and quote questions, please contact CIXIFM Winny:

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995