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  5. Ex e / Ex tb Temperature sensors
  6. Code key

Code key

Short code key comparison - old vs. new

Part of the product certificates are still carrying old code types, which were valid, when the certification took place. Since the certificates have no due time, the types will remain. Below please find a comparison between some old and new code key markings.

Old codeNew codeDescription
WT-W-Resistance sensor (RTD)
TE-T-Thermocouple sensor (TC)
-MI--M-Mineral insulated structure
-KAAPELI--CABLE-Cable structure
-BAJONETTI--BAJO-Bayonet structure
-4J--4-RTD with 4-wire connection
-KLA--A-RTD accuracy Class A
WT-MI-302-...-4J-KLA-...W-M-302-...-4-A-...An example of codes

You can download this short comparison here.  New code keys for each sensor structure are presented on standard version product pages, please see: Products > Temperature sensors »

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