Honeywell Fema DCM-203-574 Series Assembly And Operating Instructions Manual page 74

8. Testing Principles and Safety Information for Ex-de and Ex-t
Devices certified for Ex-d and Ex-e as well as
Ex-t:
Always begin with the prefix "Ex-":
Ex-DCM, Ex-DDCM, Ex-DNM, Ex-DNS,
Ex-VCM, Ex-VNM, Ex-VNS.
E.g.: Ex-DCM6, pressure switch, 0.5 to 6
bar, featuring Ex-de and Ex-t.
34 MU2B-0238GE51 R0616D