Model 3504 Retractable Process Probes have a thin walled tubular sensing element made from the alloy of interest welded onto a body of the same material. Mild Steel bodies are Teflon coated. No other materials contact the corrosive process fluid. Materials of construction are carefully matched and welds are vacuum annealed during assembly to avoid preferential corrosion effects. Model 3504 Probes provide a large test surface, excellent dynamic temperature response and protection of reference element.They are ideally suited to the more aggressive plant conditions and may be used in very aggressive organic or inorganic fluids over the entire pH range 0-14, subject to process containment requirements. These probes are standard in mild steel, 304 S.S. and 316 S.S.. Certain other alloys can be provided on special order; please contact the factory for information. The useful measuring lives of the T-10 and T-20 probe elements are 5 mils (0.13mm) and 10 mils (0.25mm) respectively.
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