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1. (WO2017037407) THERMOSTATIC CONTROLLER

Pub. No.:    WO/2017/037407    International Application No.:    PCT/GB2016/000158
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: G05D 23/275
H01H 37/38
Applicants: INVENSYS CONTROLS UK LTD
Inventors: HERBERT, Andrew George
Title: THERMOSTATIC CONTROLLER
Abstract:
A thermostatic controller comprises a sealed container containing a fluid like mono-ethylene glycol and water and wherein the sealed container comprises a surface of a metal like copper in contact with the fluid, the metal of said surface being a metal which acts as a catalyst to affect adversely the rate of thermal decomposition of glycol, said fluid further comprising a complexing heterocyclic compound like benzotriazole which serves to prevent or inhibit the catalytic action of the metal surface on the thermal decomposition of the glycol by forming a stable complex with said metal surface.