3
display, controls the two limit detection relays / switches,
and transmits the measured value through an analogue
conversion stage as a voltage or current signal output.
4.
Installation
The electronic module is mounted on a flat plate or panel,
for which it has 4 holes at the rear for self-tapping screws
3.5mm.
A wall-mounting rear adaptor plate is available as an op-
tion (s. 13. Ordering Code).
The pressure transmitters are calibrated at the factory
while mounted vertically, pressure ports downward.
However, they can be mounted in any orientation. If they
are installed with any orientation other than vertical
(pressure ports downward), the zero point must be re-set
(s. 5.3.2.).
IP65 protection for the housing is guaranteed only if suit-
able connecting cable is used.
4.1.
Process Connection
•
Only qualified technicians authorized for this type of
work should undertake installation.
•
Ensure that process equipment and pressure lines
are at atmospheric pressure before making pressure
connections.
•
The instrument should be provided with suitable pro-
tection against pressure surges (e.g., snubber or
pulsation damper).
•
Ensure that the mechanical configuration and mate-
rials of construction of the instrument are compatible
with the process media.
•
Ensure that process pressure is always less than the
specified safe pressure rating.
•
Carefully check the pressure-tightness of all pressure
connections before start-up.
4.2.Electrical Connection,
Safety Precautions for
Explosion Prevention
•
Only qualified technicians authorized for this type
of work should undertake installation.
•
Switch off electrical power to the plant before
attempting electrical installation work of any kind.
•
Do not disconnect plug live wire.
•
To ensure safe operation supply wiring system
must meet specifications for zone 2, class 3.
Electrical connections must comply with relevant
international and local regulations and norms re-
lating to electrical and instrumentation installa-
tions in hazardous areas (e.g.: EN 60079-14,
EN 50014).
•
Operating supply voltage (24 V DC/AC) must not
excess 32 V DC/AC - neither per temporary inter-
ferences! Supply wiring system must be pro-
tected by Si 315 T.
•
For recommended current supply see 11.
Specifications.
•
Parametrisation by PC serial interface adaptor
EU03.F300 is permitted only in safe areas outside
explosion-hazardous areas zone 2.
5.
Commissioning
•
Power supply and signal cabling to the transmitter
must be correctly selected to meet operational requi-
rements, and installed in a way that does not cause
physical stress to the instrument.
•
Pressure lines must have a downward gradient
throughout from the pressure instrument to the pro-
cess vessel / pipe. This is to prevent formation of air /
gas pockets (for liquid applications) and liquid plugs
(for air / gas applications). If this continuous down-
ward gradient cannot be provided for any reason,
then suitable water and / or air separation devices
must be inserted into the pressure lines.
•
Pressure lines must be kept as short as possible and
must not have short bends to avoid measurement er-
rors induced by pressure line delays.
5.1.
Pressure Connections
The instruments pressure ports are marked by " " and
" " symbols. For differential pressure applications the " "
port must be connected to the higher pressure and the
" " port should be connected to the lower pressure.
If the pressure transmitter is subjected to pressure when
it is started up, zero point checking and adjustment is not
possible. In such cases, only electrical connections of the
instrument should be made, but not the pressure connec-
tions.
5.2.
Display
Contact: EK Engineering (India)
Web: www.ekeindia.com
Email: [email protected]
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