<\/span><\/h2>\nFour specific design features determine whether a sensor makes it through an 18-month docking cycle without loss of calibration.<\/p>\n
Membrane material.<\/strong> FEP is chosen over polyethylene or silicone because it retains selectivity from \u20135 \u00b0C to 55 \u00b0C and resists the chlorine oxidation that thins competing materials. A worn FEP membrane may lose 5% span per year rather than 20%.<\/p>\nPressure balancing.<\/strong> Ballast lines run between 1.5 and 6 bar. A rigid probe body flexes and its internal electrolyte migrates, distorting the reading. A pressure-balanced housing equilibrates internal and external pressure so hydrostatic transients don’t translate into signal drift.<\/p>\nIntegrated flow control.<\/strong> Sensor performance is a strong function of velocity across the membrane. A dedicated flow chamber holds the sample at 300\u2013500 mL\/min, isolating the measurement from main-line turbulence.<\/p>\nRedundant temperature sensing.<\/strong> A Pt1000 element behind the membrane provides sample temperature at the moment of measurement, rather than an inferred value from a wall thermocouple upstream.<\/p>\n