Description Code; Main Safety-Relevant Characteristics; Process Products; Category / Zone Allocation - KROHNE H250/M10 Installation And Operating Instructions Manual

2

Description code

The safety-relevant Description code is made up of the following elements: *)
1 :
2 :
3 :
*) Positions which are not used in the type code are not required.
3

Main safety-relevant characteristics

The H..../..../M10 in Cat. II3D variable-area flowmeter consists of a combination of signal converter and
measuring tube. The main characteristics of the explosion protected version are described below.
3.1

Process products

Flammable products are allowed provided they are not present in potentially explosive form.
3.2

Category / Zone allocation

The H..../..../M10 variable-area flowmeter in Cat. II3D is basically designed for use in Zone 22 acc.
to EN 50281-1-1:1998.
3.3

Type of protection and marking

The H..../..../M10 variable-area flowmeter in Cat. II3D has a type of protection „Protection by
housing" to EN 50281-1-1:1998 and bears the following marking::
The marking consists of following specifications:
II
3
D
IP65
T65°C
Supplementary Installation and Operating Instructions M10 EEx d
H 2 5 0 /
1
Series measuring unit
H54 : Unit H54
H250 : Unit H250
Material / versions
RR : stainless steel
C : stainless steel with PTFE liner (H250: PTFE / ceramic)
HC : Hastelloy (H250 only)
Ti : Titan (H250 only)
F : aseptic version (Food) (H250 only)
Indicator / transmitter M10
II3D IP65 T65°C
General explosion protection
Device category 3
Dust explosion protection
Contaminat and water protection
Max. surface temperature of the housing without dust contamination
at ambient temperature of 60°C and process temperature of 60°C
(other process temperatures see section. 3.8)
/ M 1 0
2 3
4