1） Mechanical type;

2） Intelligent type;

3） HART ； with or without HART

4） Fieldbus

At present, intelligent positioners are mostly used, which are divided into piezoelectric type and nozzle baffle type

1） With or without feedback;

2） With or without diagnostic function;

Requirements for explosion protection?

1） Not explosion proof;

2） Intrinsic safety; Increased safety

3）Flameproof; Dust explosion-proof

1）Normal temperature: use integrated type;

2）High temperature： use separate type

3） Low temperature: use low-temperature type

1） Non-corrosive: aluminum-plastic shell;

2） High corrosivity: stainless steel shell;

Stainless steel enclosures for highly corrosive environments such as offshore platforms