Measurement, Monitoring and Leak Detection

Contamination and Filter Monitoring

A filter or strainer does not blind off suddenly but over weeks. The first place it shows is the differential pressure across the element: it rises while the flow behind it slowly falls. Return temperature follows much later. In a newly installed loop the load comes from installation debris, swarf and sealing compound; in service it comes from corrosion products and biofilm. Contamination monitoring reports this trend before it shifts the operating point.

We currently list no dedicated items for this function; the category exists and the range is being built up. The trend can still be followed today by fitting two gauges of the same design before and after the element and recording their difference. A flow switch downstream of the filter gives the same signal from the other direction. Both are available in the neighbouring categories for pressure and flow measurement.

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Buying guide

How to choose Contamination and Filter Monitoring

What matters when choosing: properties, comparison and typical applications.

Contamination Monitoring - Status and Gap

⚠ category currently without items - the function is described, the range is being built up

📈 differential pressure moves first - flow follows, return temperature reacts last

⚙ two identical gauges as a stopgap - upstream and downstream pressure, difference recorded manually

🔧 flow switch as a cross-check - reports the drop behind the filter independently of pressure

✓ commissioning is the critical period - installation debris hits the filter in the first weeks of operation

Signs and Detection at a Glance

Signs of fouling and how they can be captured today

Sign	Underlying cause	Detection today	Source in the range
Rising differential pressure	filter element blinding off	two identical gauges, difference recorded	pressure measurement
Falling flow	added resistance behind the element	flow meter or switch in the branch	flow measurement
Rising return temperature	reduced heat removal at the rack	resistance thermometers in supply and return	temperature measurement
Particles and turbidity	installation debris, corrosion, biofilm	sampling through a test point	test points and test connections
Automatic fouling alarm	differential pressure switch on the element	not yet available	range being built up

Typical Applications

strainers upstream of circulating pump and heat exchanger
fine filters in the secondary loop ahead of direct liquid cooling at the rack
flushing and first commissioning of new pipe sections
recurring maintenance with a documented differential pressure trend
assessment of a loop after rebuilding or extending a rack row