Delta Controls DPR-2000 - Manual (Page 18)

A 16 IOM-DPCDPR-A: FEB 2014
6.2.4. In the case of the DPR-2000GALW transmitters, the sensing module is located inside the transmitter
casing. It is designed for the measurement of low pressures of non-aggressive gases, with a permitted
overpressure of 1bar (or 350mbar). The basic (economy) version of this transmitter has ø6x1 elastic tubes
terminals fitting, while the industrial version has adapters as shown in fig. 17.
6.2.5. DPR-2000YALW smart level probe is equipped in diaphragm seal and flange to fixing on tank.
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 heavy objects hitting the instrument (resulting, in extreme cases, in
a part of the system with transmitters being torn off and medium leakage), appropriate means of
protection should be applied for safety reasons and to avoid the possibility of sparkling or other,
more appropriate location should be selected for the transmitter.
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.
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 DPC..., DPR... transmitters may be used to measure media with temperatures of up to 120°C. To protect the
sensing module from temperatures higher then 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, DPC..., DPR... transmitters with remote
diaphragm seals should be used (see “DIAPHRAGM SEALS ”catalogue cards).
Data as per Appendix Exi or Appendix Exd.02 apply for the Ex or Exd version.
i