KROHNE DK37NEPSIExi User Manual
DK37/M8 - H250/M8
DK37/M8 - H250/M8
DK37/M8 - H250/M8DK37/M8 - H250/M8
Variable area flowmeter
with electrical built-ins
Equipment in protection type intrinsic safety Ex i
Supplementary instructions
Supplementary instructions
Supplementary instructions Supplementary instructions
© KROHNE 09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
CONTENTS
DK37/M8 - H250/M8
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 NEPSI conformity ............................................................................................................. 3
1.3 Security information......................................................................................................... 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 5
2.4 Flammable products ........................................................................................................ 6
2.5 Device category ................................................................................................................ 6
2.6 Types of protection ........................................................................................................... 6
2.7 Ambient temperature / temperature classes.................................................................. 7
2.8 Electrical data................................................................................................................... 8
3 Installation 9
3.1 Installation........................................................................................................................ 9
4 Electrical connections 10
4.1 General notes ................................................................................................................. 10
4.2 Earthing and equipotential bonding ............................................................................... 11
5 Operation 12
5.1 Start-up........................................................................................................................... 12
5.2 Operation ........................................................................................................................ 12
6 Service 13
6.1 Maintenance ................................................................................................................... 13
6.2 Dismantling .................................................................................................................... 13
7 Attachment 14
8 Notes 18
2
www.krohne.com 09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
DK37/M8 - H250/M8
1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking II 2 G. They complete the installation and operation
instructions for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to category 2
explosion protection. The technical details given in the installation and operation instructions for
the non-explosion protected versions apply unchanged unless excluded or superseded by these
instructions.
1.2 NEPSI conformity
The DK37/... variable-area flowmeters series has been approved by NEPSI (National Supervision
and Inspection Center for Explosion Protection and Safety of Intrumentation in China) under
Certification No.
GYJ12.101090
GYJ12.101090
GYJ12.101090GYJ12.101090
SAFETY INSTRUCTIONS 1
This certification together with its boundary conditions is required to be observed without fail.
The Ex marking is NOT acc. to the ATEX directive 94/9/EC (see also Attachment "Certificate").
Placing the product on the market of the EU for purpose of distribution and/or use in the EU is
NOT permitted.
1.3 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation. This applies particularly for the
use of easy detachable process connections such as SMS or Clamp when measuring flammable
mediums.
www.krohne.com09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
3
2 DEVICE DESCRIPTION
2.1 Device description
Variable area flowmeters are used to measure and display volume flows of flammable and nonflammable gases and liquids.
The M8E 1 indicator houses a signal output 4...20 mA with a bar graph indicator.
The M8M 2 indicator houses two separately adjustable electrical limit switches.
DK37/M8 - H250/M8
2.2 Description code
The safety description code * consists of the following elements:
1 Type series measuring unit DK37
2 M8 indicator type series
3 Design of indicator
M - Mechanical indicator
E - Electronic indicator with signal output 4...20 mA
4 Differential pressure regulators
RE - inlet pressure regulator
RA - outlet pressure regulator
5 Limit switch (only M8M indicator)
K1 - One limit switch
K2 - Two limit switches
* positions which are not needed are omitted (no blank positions)
4
www.krohne.com 09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
DK37/M8 - H250/M8
2.3 Marking
1 Device type
2 Manufacturer
3 Sizing data: temperature & pressure rating
4 PED data
5 Ex data
6 Electrical connection data
7 Note on observing documentation
8 Manufacturer's website
DEVICE DESCRIPTION 2
www.krohne.com09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
5
2 DEVICE DESCRIPTION
2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. The following values define it
= -20...+60°C / -4...+140°F and P
T
atm
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Installation conditions:
Installation conditions:
Installation conditions:Installation conditions:
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection – regardless of the zone assignment – is fundamentally not applicable due
to the lack of key safety data for the interior of the measuring section.
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
for ensuring that the flowmeter is operated safely as regards the temperature and pressure of
the products used. In case of operation with flammable products the measuring units must be
included in the periodic pressure tests of the system. When using the device version H250/C...
(PTFE-liner, nonconductive) the min. conductivity of the medium must be 10
avoid the electrostatic charge.
= 0.8...1.1 bar.
atm
DK37/M8 - H250/M8
-8
S/m, in order to
2.5 Device category
Variable area flowmeters are designed according to GB 3836.1-2010 and GB 3836.4-2010
2.6 Types of protection
The variable-area flowmeter is designed with Intrinsic Safety type of protection, protection level
“ia“.
The marking Ex ia IIC T1-T6 Gb
Ex ia
Ex ia Intrinsic Safety type, protection level “ia“
Ex iaEx ia
IIC
IIC suitable for gas group IIC, IIB and IIA
IICIIC
T1-T6
T1-T6 suitable for temperature class T6 ... T1
T1-T6T1-T6
Gb
Gb EPL, suitable for zone 1
GbGb
Ex ia IIC T1-T6 Gb contains the following information:
Ex ia IIC T1-T6 GbEx ia IIC T1-T6 Gb
6
www.krohne.com 09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
Loading...