What SH3XW22 actually measures
SH3XW22 is a Schneider Electric SH3-series wall-mount transducer combining a temperature sensor and humidity sensor in one IP65 housing (cites:,). It runs on a 2-wire loop with a proprietary mA output, intended for fixed installation on a wall or panel face (cites:,). The slim body — 43 mm deep, 101 mm wide, 182 mm tall with an 82 mm visible diameter at the wall plate — fits a standard conduit entry without crowding the gland plate (cites:,).
Ranges, accuracy, and what they mean at the controller
The temperature setting range is -40…60 °C with the headline 0.2 °C accuracy Schneider quotes for the SH3 line, while the humidity setting range covers the full 0…100 % RH span at 1.5 % RH accuracy (cites:,). In practice that means the loop can be trusted for HVAC and cleanroom monitoring across the band an indoor or sheltered-outdoor wall will see, without recalibration every season — though the polymer humidity element still wants the periodic field swap any capacitive RH sensor needs.
Loop wiring and panel-side integration
A 2-wire, proprietary mA output simplifies the field cable: a single shielded pair from the wall plate to the controller or BMS analogue input, with the loop-powered device drawing its supply from the same pair (cites:,). The IP65 rating on the body seals against washdown and dusty plant-room air when the cable gland is correctly torqued — the housing seal is the wet-end barrier, the gland seal is the cable-side one, so both must be seated for the rating to hold (cites:,).