Honeywell TTCS41M

Manufacturer:​ Honeywell Building Technologies
Product Introduction:​ An outdoor ambient temperature sensor containing a passive resistive element (typically NTC 10kΩ or Pt1000 depending on regional variant) used in building automation for enthalpy economizer control, freeze protection, and weather-compensated HVAC reset.

Honeywell XFR822A

Product Name:​ Excel 800 / Building Management Panel Bus Analog Output Module with Manual Override (also referenced as relay-type I/O in some DCS contexts)
Overview:​ Part of Honeywell's Excel 800 (XL800 / Ciper 50) building automation system I/O family. Provides 8 analog output channels (0–10 V / 0–11 V) with individual manual override potentiometers. Also used in some process DCS retrofits as a Panel-Bus I/O module.

Honeywell XSL512

Product Name:​ Safety Manager / FSC SIL 3 Analog Output Module (16-channel, 4–20 mA)
Overview:​ Redundant-capable, hot-swap analog output module for Honeywell Safety Manager / Fail Safe Controller (FSC) SIS. Delivers certified 4–20 mA signals to final elements (ESDVs, control valves with positioners) with per-channel diagnostics and HART pass-through.