5123134010 Schneider STP200-150 Liquid Line Thermo Element 150mm Stem 10k Ohm Curve 2 Pocket Well

Every hydronic control loop inherits the accuracy of the probe that feeds it, which is why the 5123134010 is treated as a measurement instrument rather than an accessory. Catalogued by Schneider Electric inside the STP200 (10 kOhm, curve type 2) range, it carries a stainless-steel stem that is lowered into the water stream through a separate closed pocket, so the sensing element can be swapped during a maintenance window without draining the circuit.

Behind the stem a moulded, sealed transition separates wet metal from the cable, and the factory-fitted gland keeps condensation, dust and wash-down spray away from the conductor. Because the device is passive it draws no meaningful current, needs no firmware update and has no battery to schedule for replacement; the controller's own measuring circuit supplies the excitation and reads the returning value.

Every unit is checked against a traceable temperature reference before packing, and the paperwork that travels with it suits commissioning records, handover dossiers and energy-audit evidence.

District-heating laterals and heavily insulated plant-room headers are its natural habitat. In those locations the probe must pass through a layer of mineral wool or closed-cell foam before it reaches anything worth measuring, and a stem that stops short reports a temperature that is quietly wrong by several degrees.

The 150 mm reach also suits large-bore chilled lines, where a deeper insertion dampens the influence of pipe-wall temperature and improves the stability of the control loop. Because heating energy reporting increasingly feeds mandatory consumption records, using a probe long enough for the job has a compliance dimension as well as a comfort one.