Direct Answer When a pump or air compressor reaches the set pressure but does not stop, the problem usually comes from one of three areas: In pump and compressor systems, a pressure switch that fails to cut out correctly, or cuts out too early, can cause abnormal operation. A compressor that does not cut out…
Direct Answer Pump short cycling is often caused by improper cut-in pressure and cut-out pressure settings on the pressure switch. Cut-in pressure is the pressure point where the pump starts as system pressure drops.Cut-out pressure is the pressure point where the pump stops as system pressure rises.The gap between them is called the differential. Boshart defines cut-in as the falling-pressure point, cut-out…
Direct Answer Low pump inlet pressure is usually caused by water shortage, dry running or loss of prime, clogged suction strainer, partially closed inlet valve, or excessive suction pipe resistance. In pump systems, inlet pressure monitoring is an important way to judge whether the pump is receiving enough liquid. By checking inlet pressure, discharge pressure, flow,…
Direct Answer The start and stop pressure of a pressure switch are called cut-in pressure and cut-out pressure. Cut-in pressure: the pressure at which the pump starts when system pressure drops.Cut-out pressure: the pressure at which the pump stops when system pressure rises. Boshart defines cut-in as the falling-pressure point and cut-out as the rising-pressure point. The difference…
Direct Answer A pressure switch can be used for pump dry-run protection by monitoring the suction-side pressure. When inlet pressure drops below the safe set point, the pressure switch sends a signal to the control panel, PLC or relay circuit. The control system then stops the pump or prevents it from starting. Dry-running protection is…
Direct Answer Low pump inlet pressure is usually caused by water shortage, dry running or loss of prime, clogged suction strainer, partially closed inlet valve, or excessive suction pipe resistance. In pump systems, inlet pressure monitoring is an important way to judge whether the pump is receiving enough liquid. By checking inlet pressure, discharge pressure, flow,…
Direct Answer Stable pump outlet pressure monitoring should not rely on a standard mechanical pressure gauge alone. A better solution is to use a pressure transmitter for continuous pressure signal output, a pressure switch for high/low pressure alarm and pump protection, and a digital pressure gauge for local display and maintenance inspection. The pump outlet is often affected by pressure pulsation,…
In modern municipal water treatment and Seawater Reverse Osmosis (SWRO) facilities, injecting high concentrations of chemicals like Sodium Hypochlorite (NaOCl) and Ferric Chloride (FeCl3) is critical for disinfection and flocculation. However, these powerful oxidants and corrosive agents pose extreme chemical degradation threats to flowmeter wetted parts, capable of destroying standard 316L stainless steel electrodes in…
Self-Check & Correction Note: This English version has been rigorously reviewed to ensure precise signal processing and fluid dynamics terminology. Terms like “Nyquist sampling theorem,” “aliasing effect,” and “low-frequency DC excitation” are correctly applied. The narrative directly addresses the operational pain points in large-scale desalination plants, such as those operated by SWCC, elevating the professional…
Electromagnetic Measurement Executive Summary In large-scale seawater desalination facilities across regions like Saudi Arabia, the Reverse Osmosis (RO) process is the critical core. However, the high-purity water (RO permeate) generated after advanced membrane treatment inherently possesses extremely low electrical conductivity. This directly breaches the physical measurement limits of traditional electromagnetic flowmeters, causing instruments to output…
In municipal water treatment and Seawater Reverse Osmosis (SWRO) processes, the precise dosing of coagulants, biocides, and antiscalants via diaphragm pumps is critical for ensuring water quality and membrane longevity. However, the “high-frequency pulsating flow” generated by positive displacement pumps induces severe signal “aliasing” errors in traditional electromagnetic flow meters, leading to violently fluctuating flow…