These instruments are designed to measure the temperature of the insulating oil inside of power transformer tanks and they can fitted with up to five change-over micro switches suitable to control cooling equipments and protection circuits (alarm and trip) of the transformer.
Effectiveness of these instruments must be stressed, both as regards measuring/commutation precision and extreme simplicity of operation.
Standard measuring ranges: -20 / +130°C; 0 / +150°C; -20 / +140°C; 0 / +160°C; 0 / +200°C.
Capillary tube protection: Rilsan tubing / stainless steel armouring / steel + PVC armouring
Casing: Aluminium alloy powder painted (RAL 7035) suitable to withstand to any climate and to heavy polluted
atmosphere in as well tropical or arctic climates (-40 / +70°C).
Mechanical protection degree: IP 65
Lens: Glass or polycarbonate
Locking ring: Nickel plated brass; transparent coated
Measuring tolerance: 1,5% of full scale value
Commutation tolerance: 2% of full scale value
Commutation differential: 4% of full scale value
Insulation : 2000V 50Hz between terminals and earth for a 60 seconds time