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KROHNE H250 M10 User Manual

KROHNE H250 M10
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Variable area flowmeter
Equipment category II 2G
Equipment category II 2GEquipment category II 2G
Equipment category II 2G
H250 M10
H250 M10H250 M10
H250 M10
Supplementary instructions
Supplementary instructions Supplementary instructions
Supplementary instructions
© KROHNE 06/2012 - 4001058901- MA H250/M10-Ex-II2G-AD R02 en
AD_H250_M10_II2G_R02_en_058901_PRT.book Page 1 Tuesday, June 26, 2012 7:20 AM
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KROHNE H250 M10 Specifications

General IconGeneral
TypeVariable area flowmeter
Process PressureUp to 40 bar
Power Supply24 V DC
ApplicationLiquids and gases
Nominal DiameterDN15 to DN150
Pressure RatingPN40
Fluid ConductivityNot required
Output Signal4…20 mA, HART®
Protection ClassIP67
MaterialStainless steel, PTFE
ApprovalsATEX, IECEx
Process Temperature-40 to +150°C

Summary

Safety Instructions

General Safety Notes

These additional instructions complement standard documentation for explosion-protected versions.

EC Conformity Declaration

Declares conformity with the protection goals of Directive 94/9/EC for use in hazardous areas.

Personnel Training Requirements

Assembly, installation, start-up and maintenance may only be performed by personnel trained in explosion protection.

Device Description and Specifications

Overview of Variable Area Flowmeter

Measures and displays the volume flow of flammable and non-flammable gases and liquids.

Understanding the Description Code

Explains the elements that constitute the safety description code.

Device Marking and Identification

Details type designation, nameplates, and additional markings on the housing cover.

Flammable Product Conditions

Defines explosive atmosphere conditions and provides operational warnings.

Equipment Category and Zone Classification

Specifies design according to EN standards for use in zone 1.

Protection Types and Marking

Details flameproof enclosure 'd' design and its associated marking interpretation.

Temperature Class Determination

Explains how product and ambient temperatures determine the device's temperature class.

Electrical Specifications

Provides rated voltage and nominal current for electrical equipment.

Installation Procedures

General Installation Guidelines

Installation and setup must be carried out by qualified personnel according to applicable standards.

Special Installation Conditions

Covers equipotential bonding and electronics compartment lock requirements.

Electrical Connections

Insulation and Terminal Compartment

Details insulation ratings, terminal compartment, and cable connection requirements.

Power Supply Details

The required supply for built-in electronics is provided via the 4...20mA current output.

Input and Output Signal Interfaces

Connecting signal circuits to PELV devices and terminal assignment details.

Earthing and Equipotential Bonding

Connecting the signal converter to the equipotential bonding system of the hazardous area.

Operation and Start-up

Device Start-up Procedures

Outlines conditions for permitted start-up and configuration methods.

Operational Guidelines and Precautions

Operating within limits and safety measures for flammable products.

Service and Maintenance

Regular Maintenance Checks

Recommends checks for housing, cable entries, connections, and indicator for proper condition.

Dismantling and Component Replacement

Procedures for opening the electronics compartment and replacing components.

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