006920301 Schneider STP300-200 0/100 Loop Thermo Transmitter 4-20mA 200mm Stem District Heat Signal

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 interface units and central plant manifolds that feed several building zones are the classic application. Those headers are typically well insulated, so the probe must clear the cladding, yet the temperatures involved sit comfortably inside a conventional heating band where a concentrated span delivers the best usable resolution.

The 200 mm stem also reduces the influence of pipe-wall temperature on the reading, which stabilises supply and return differentials used for pump control and energy allocation. Where a site is billing heat between tenants or reporting consumption for compliance, that stability translates directly into defensible numbers rather than estimates.