E6 37 DTR.APC.APR.ALW.03(ENG)
7. PLACE OF INSTALLATION
7.1. General recommendations
7.1.1. The smart pressure transmitter and differential pressure transmitter can be installed both indoors and
outdoors. It is recommended that transmitters intended for outdoor use be placed in a box or under cover.
7.1.2. The place of installation should be chosen in such a way as to allow access to the device and to protect it
from mechanical damage. In planning the installation of the transmitter and configuration of the impulse lines,
attention should be paid to the following requirements:
- The impulse lines should be as short as possible, with a sufficiently large cross-section, and free of
sharp bends, in order to prevent blockages;
- Where the medium is a gas, the transmitters should be installed above the measuring point, so that
condensation flows down towards the site of the pressure measurement; where the medium is a liquid
or where a protective liquid is used, the transmitters should be installed below the place where
the pressure measurement is taken;
- The impulse lines should be inclined at a gradient of at least 10cm/m;
- The levels of filling liquid in the impulse lines should be equal or kept constant difference;
- The configuration of the impulse lines and the valve connection system should be chosen with regard
to the measurement conditions and to requirements such as the need to reset the transmitters in
position and the need for access to the impulse lines during water or gas removal and flushing.
7.1.3. Where there is a risk of damage to the transmitter thorough impact (which can result in
extreme cases with the transmitter being separated from the connecting pipework thus permitting
leakage of medium), appropriate means of protection should be applied for obvious safety
reasons and to avoid the possibility of sparking caused by being struck. If the transmitter cannot
be suitably protected then an alternative mounting location should be sought.
7.1.4. Attention should also be paid to possible installation faults which may lead to measurement errors, such
as connections which are not tight, sediment blockage in lines which are too narrow, gas bubbles in a liquid line
or liquid column in a gas line etc.
7.2. Low Ambient Temperature
When the solidification point of the liquid whose pressure is being measured is higher than the
ambient temperature, steps should be taken to protect the measurement apparatus from freezing
effects such as medium expansion.
This is particularly important in the case open-air installations.
Protection is obtained by filling the impulse lines with a mixture of ethylene glycol and water, or another liquid
whose solidification point does not exceed the ambient temperature. Thermal insulation can protect the
transmitter casing and lines only from brief exposure to low temperatures. Where the temperature is very low,
the transmitter and impulse lines should be heated.
7.3. High Medium Temperature
The APC..., APR... transmitters may be used to measure media with temperatures of up to 120ºC (PED version
see p 5.2.4, 5.3.5). To protect the sensing module from temperatures higher than 120ºC, long impulse lines are
used to disperse the heat and to lower the temperature of the sensing module.
Where it is not possible to use impulse lines of the required length, APC..., APR... transmitters with remote
diaphragm seals should be used (see “DIAPHRAGM SEALS” catalogue cards).
Data as per Appendix Exi.ATEX / Appendix Exi.IECEx apply for the Ex version and Appendix
Exd.ATEX / Appendix Exd.IECEx apply for the Exd version.
7.4. Electrostatic Risks
Lacquer on the enclosure, plastic rating plate and teflon on the diaphragm seals are non-conductive layer
applied on conductive surface. Transmitters in this version should be installed in area where is a risk of dust
explosion, in the place where there is no possibility of electrostatic charging, in particular by contact with the
electrified dust slipped or blown out from the devices working near.
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