Dräger SAM 3100, Инструкция по эксплуатации

Страница: 7 / 16

Installation
Dräger SAM 3100/3200 7
5.3 Electrical connections
5.3.1 Pump
 For electrical installation works, the appropriate safety
regulations must be followed.
 Before connecting the pump, ensure the electricity supply
is switched off.
 The supply voltage should be checked against
the specifications on the rating plate on the gas
sampling pump. The supply voltage may deviate by
a maximum of +/– 10 % from the specifications on the
rating plate.
 The earth wire should be connected to the gas
sampling pump. Install the gas sampling pump in such
a way that it is not possible to touch the live parts
(electrical connection).
 A device for isolating the gas sampling pump from the
mains supply should be included in the electrical
installation. The electricity supply to the pump motor should
be protected with a fuse. The current consumption can be
found on the rating plate.
 For systems with a gas sampling pump, a motor circuit
protector should be provided in the supply voltage cable,
without exception. The protection switch is installed in the
control cabinet. The motor circuit protector should be set to
the nominal motor current for the gas sampling pump
(see rating plate). Please note the manufacturer's technical
information (Instructions for Use are included in
the documentation).
5.3.2 Gas transmitter
 Gas transmitters from Dräger are connected to a central
controller, e.g. Dräger REGARD, in accordance with
the specifications in the associated Instructions for Use
(see section 7 on page 8).
5.3.3 Flow meter with ring initiator
 The flow meter is supplied provided with a connection
housing.
 The cable is connected directly to the circuit breaker in
the control cabinet.
 Please note the manufacturer's technical information
(see Instructions for Use for the flow meter).
5.3.4 Wiring diagram:
The electrical connection of the installed, intrinsically safe,
equipment to the + and – terminals is carried out in accordance
with the following illustration and table. A limit sensor is
connected to each terminal block. Pay attention to the
specified polarity.
5.3.5 Connection cable:
The connection cables for the intrinsically safe circuit should
be selected according to the relevant installation standard.
In so doing, the formation of a summation current between
different intrinsically safe circuits of the float-type flow meter
should be prevented. When laying the cables, ensure sufficient
distance between the surfaces of the measuring component
and the connection cable.
5.3.6 Earth connection:
With float-type flow meters, when the flow impacts non-
conductive components during operation this can cause
charge separation in the measuring tube. In the case of glass
equipment, it is, in principle, possible for the electrostatic field
generated within the measuring tube to penetrate through to
the outside of the equipment.
The float-type flow meter is connected to the installation plate
via the earth connection for the purpose of diverting
electrostatic charge. The earthing should be connected to the
local earth potential by the individual assembling the system as
a whole.
The operator is responsible for the uninterrupted earthing
of the process line.
The connection merely ensures electrostatic earthing of the
equipment and does not meet the requirements for
equipotential bonding. When measuring dust-free gases
or liquids, the flow rate may not exceed 20 times the nominal
flow rate. Note the max. permissible operating pressure PS
printed on the rating plate.
CAUTION
The electrics may be laid and connected only by
a specialist and whilst observing the relevant directives.
!
00823944_en.eps
limit value transmitter connection
soldered connection
ring initiator
– 1 +
– +
01823944_en.eps
earthing
connection