Heinrichs Messtechnik
BGN Installation and Operating Instructions
Page 12 of 34
Subject to change without notice
Therefore operation with combustible products is only allowed if a potentially explosive air mixture is not
formed inside
the flow meter. Where this condition are not met, the operator will need to assess the ignition hazard in
each individual case and give due consideration to existing parameters (e.g. pressure, temperature, process product,
materials of construction for the measuring tube).
10.1.5.4
Ground connection
In variable-area flow meters, in principal it is possible that through the flow of non-conductive liquids a charge separation occur
inside the measuring tube. A dissipation of such charge carriers from the metal flow tube through earthing must be ensured by
permanent earthing via process connections through the operator.
If grounding cannot be made via the process connections (plastic process connections or undefined connections), the flow meter
must be connected to the local ground potential via the flanges. This connection only ensures electrostatic grounding of the device
and does not meet the requirements for equipotential bonding.
10.2
Ambient conditions
10.2.1 Ambient temperature ranges
Without electrical accessories
:
-40°C to +80°C
With limit switches
:
-40 °C to +80°C : Observe the type certificate of the contact manufacturer!
With ES signal output
:
-40°C to +70°C
For the hazardous area version, take note of the maximum ambient temperatures depending on the temperature class as specified
on the Type Examination Certificate.
10.2.2 Storage temperature
The storage temperatures are identical to the ambient temperature ranges.
10.2.3 Climatic category
Weather-protected and/or unheated locations, class C according to IEC 654 Part 1
10.2.4 Degree of protection
IP 65 (Aluminum indicator unit)
IP 67 (Stainless steel indicator unit)
10.2.5 Shock resistance/vibration resistance
The meter should be protected from extreme shocks and vibrations, which could cause damage.
10.2.6 Electromagnetic compatibility
EN 61000-6-2:2011
Störfestigkeit Industriebereich / immunity industrial environment
EN 61000-6-3:2011
Störaussendung Wohnbereich / emission residential, commercial
EN 55011:2011
Gruppe 1, Klasse B , Funkstörungen / Group 1 Class B , ISM ratio-frequency equipment
EN61326-1:2013
EMV-Anforderungen / EMC requirements
NAMUR recommendation NE 21Fluid conditions
10.2.7 Fluid temperature ranges
BGN-S/H : - 40°C to +200°C
Special versions: -80°C to +350°C
BGN-P :
- 20°C to +125°C
