In fluid transport systems, pressure transmitters act as the "nerve endings" of pumping systems, continuously monitoring pressure changes and safeguarding the entire system's safe and efficient operation. Proper selection not only enhances system reliability but also significantly reduces energy consumption and maintenance costs, while ensuring compliance with national and regional regulatory requirements.
Case Details
1. Defining Measurement Objectives and Compliance Foundations Depending on the pump system's control needs, determine whether the transmitter is for monitoring inlet pressure, outlet pressure, or differential pressure. Outlet pressure is often used for constant pressure control and overload protection, while inlet pressure helps prevent cavitation and dry running. Selection must prioritize compliance with national and industry standards, such as China's **GB/T 17614** for transmitters used in industrial process control systems, which specifies performance, safety, and environmental adaptability requirements.
2. Key Selection Parameters and Regulatory Requirements (1) Range and Accuracy: The range should cover normal operating pressure with margin (typically 1.5 times the maximum pressure). For critical applications like fire pump systems, compliance with GB 27898 (Fixed Fire Water Supply Equipment) is mandatory, requiring high reliability and explosion-proof certification.
(2) Output Signal and Interface: 4–20mA analog signals are widely used for long-distance transmission and noise immunity; digital signals (e.g., HART, Profibus) must match control system protocols. In the EU, the Pressure Equipment Directive (PED 2014/68/EU) imposes strict safety certification requirements for pressure-bearing components.
(3) Materials and Explosion-Proofing: Wetted parts must resist fluid corrosion (e.g., Hastelloy for seawater). In flammable/explosive environments (e.g., chemical plants), China mandates explosion-proof certification (e.g., Ex d), Europe requires ATEX Directive (2014/34/EU) compliance, and North America demands UL or CSA certification.
3. Installation and Regional Regulations Transmitters should be installed at the pump outlet for closed-loop control and at the inlet to prevent cavitation. For public water supply systems, China’s GB 50788 (Urban Water Supply and Drainage Technical Code) requires pressure transmitters to be waterproof, corrosion-resistant, and durable. EU drinking water equipment must comply with DVGW/W270 standards, requiring materials with water contact hygiene approval.
Choosing compliant and reliable pressure transmitters is like equipping pumping systems with a 24/7 "safety guardian," ensuring not only safe and efficient operation but also facilitating compliance approvals and long-term stability.
