HDA 4000 with IECEx-Approval
Page 3 of 30
Status: 2014-09-03
HYDAC ELECTRONIC GMBH
Mat.
No.: 669746
1. General
If you have any queries regarding technical details or the suitability of the unit for your application,
please contact our
Technical Sales Department
. The series HDA 4000 pressure transmitters are
individually tested and calibrated at a computer operated test station. They are maintenance-free
and operate perfectly when used according to the data (see Technical Specifications). However, if
there is a cause for complaint, please contact
HYDAC Service
. Interference by anyone other than
HYDAC personnel will invalidate all warranty claims plus the IECEx approvals.
2. Function
The pressure signal measured by the sensor is converted into a proportional analog
4..20 mA signal Connection to the power supply is done via a plug connector or a permanently
attached line.
3. Installation and commissioning Information
The pressure transmitters can be installed directly on the process side via the threaded
connection. It is important to ensure that the membrane is protected from mechanical damage.
This is particularly relevant for instruments with a flush membrane.
In order to prevent mechanical damage when dealing with critical applications involving heavy
vibrations or blows, for example, we recommend securing the unit with an elastomer clamp and
decoupling the hydraulic ports via a Minimess hose.
Tightening torque see dimensions.
Pressure transmitters with a rated pressure of < 100 bar (
≤
1500 psi) provide for pressure
equalization with the ambient pressure. This is enabled by a small hole underneath the plug
connector. The connector is covered on the inside by a special membrane which prevents moisture
from seeping into the unit from the outside. In order to prevent the hole from becoming clogged,
mounting should be done in a horizontal position in moist or dusty environments, or vertically with
the pressure port pointing downwards.
On units with a rated pressure of < 100 bar (
≤
1500 psi) and a ½“ Conduit electrical connection, the
pressure equalization with single conductor is realized by means of a short vent line, using
insulated cables, it is realized by means of a cable with an integrated venting hose. It must be
ensured that the venting only takes place outside the hazardous area.
Connection is to be done by a properly qualified specialist in accordance with the pertinent
regulations pertaining to potentially explosive environments (e.g. EN 60079-14).
The series 4000 pressure transmitters carry the
-mark. The certificate of conformity can be
found in the annex.
The requirements of the standards (see technical data) cannot be satisfied unless the pressure
transmitter housing is properly grounded via the mechanical connection or the ½ NPT Conduit. If a
green-yellow wire is available, it can be used additionally for grounding, but may not be used on its
own as the grounding connection. When using hose mounting the housing has to be grounded
separately.
The related intrinsically safe devices (e.g. zener barriers) must also be grounded. A potential
equalization is required along the intrinsically safe electrical circuit in the N type model (insulation
valtage
≤
50 VAC).
On the HDA 4000 series, type H (insulation voltage
≤
500 VAC), the cable length to the pressure
transmitter must be max. 30 m (overvoltage protection to DIN EN 61000-6-2). If the cable length
exceeds 30 m, overvoltage protection must be provided by the customer.
