| Item | Option | Confirm parameter or description | ||
| Positioner form requirements? |
1）Mechanical type; 2） Intelligent type; 3） HART ； with or without HART 4）Fieldbus；
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At present, intelligent positioners are mostly used, which are divided into piezoelectric type and nozzle baffle type |
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| Extra features? |
1） With or without feedback; 2） With or without diagnostic function;
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| Requirements for explosion protection? |
1） Not explosion proof; 2）Intrinsic safety; Increased safety 3） Flameproof; Dust explosion-proof
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Ambient temperature?
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1）Normal temperature: use integrated type; 2）High temperature： use separate type 3） Low temperature: use low-temperature type
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| Environmental corrosivity? |
1）Non-corrosive: aluminum-plastic shell; 2）High corrosivity: stainless steel shell;
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Stainless steel enclosures for highly corrosive environments such as offshore platforms | ||
| Others (Remarks) In particular, For example, Siemens has anti-interference (i.e. filter module) Masonolian and Siemens have options for higher volumes Fisher DVC6200 with optional low gas consumption, natural gas certification DVC2000 select high/low air volume Metso High, Medium and Low Capacity |
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