Badger Meter SRD/SRI Valve Positioners - Manual (Page 66)

SAFETY REQUIREMENTS
EMC and CE
For notes regarding Electromagnetic compatibility, EMC, and
CE labels see the Product Data Sheet
In order to ensure EMC protection, the screwed electronics
housing must be locked
Explosion Protection
(Only if ordered)
Technical data for explosion protection see Product Data
Sheet or Certificates of Conformity EX EVE0109 A
For installations located in explosive atmospheres, all
relevant national regulations and installation conditions
must be observed, for example, in the Federal Republic of
Germany ElexV and DIN VDE 0165
MPORTANT I
When repairing explosion-protected equipment, observe the
national regulations.
Repairs involving parts must be manufacturer’s original parts
The following applies to the Federal Republic of Germany:
Repairs involving parts required for explosion protection
must either be carried out by the manufacturer or by
authorized personnel and confirmed by certificate
SYSTEM CONFIGURATION
The safety requirements must be observed!
HART Communication
When using the ‘communication’ (an alternating current
signal, which is modulated onto the 4…20 mA signal),
make sure that the connected outputs are suitable for
the used frequency ranges Apart from the load, also
check the alternating current impedances Use only
suitable instruments
To eliminate crosstalk between leads and to reduce
disturbances through electromagnetic influences, use
twisted paired shielded leads (0 3…2 5 mm 2 , max 100 pF/m)
The capacities of the leads and the connected instruments
must not exceed the maximum values for HART
All components that are connected to the SRD in an
explosion hazardous area, require an Ex-Approval The
applicable limit values must not be exceeded in any
case These limit values also have to be adhered to when
connecting additional capacitances, inductances, voltages
and currents
Measuring HART Communication Signal
If a reliable communication signal cannot be received, check
the level with an oscilloscope The first data block always
comes from the configurator and the second block is the
reply from the SRD
HART measured at
configurator: measured at
SRD:
Configurator
transmits at least
350 mVpp
at least
120 mVpp
SRD960
transmits at least
120 mVpp
at least
400 mVpp
FoxCom Communication
When using the ‘communication’ (a rectangular signal
which is modulated onto the constant current signal), make
sure that the connected outputs are suitable for the used
frequency ranges The supply instrument must be a voltage
source with an impedance of 250…500 Ohm The total of
all instrument and lead capacities must be <60 nF Use only
suitable instruments
To eliminate crosstalk between leads and to reduce
disturbances through electromagnetic influences, use
twisted paired shielded leads (0 3 2 5 mm 2 , max 100 pF/m)
The capacities of the leads and the connected instruments
must not exceed the maximum values for FoxCom
Page 66
Safety Requirements
August 2014 POS-UM-00009-EN-02