Function; Important Information Before The Device Is Put Into Operation - Datcon DT7200 Series User Manual

1. Function

.
The DT7200 family of pressure transmitters can be used for the measuring of pressure in
explosive areas. The transmitter has a two-line system; that is, it creates the 4-20 mA signal
proportionate with the input pressure in the external power supply circuit. The process medium
to be measured can be either gas or liquid. The system offers the opportunity for both absolute
and relative measurement of pressure. The three members of the family are suitable for
measuring in different temperature ranges.

2. Important information before the device is put into operation.

.
Please read the following instructions attentively, because the Manufacturer does not undertake
responsibility for those failures that arise from improper handling.
Such pressure that is higher than the maximum value specified in the User Manual and in the
data table must not be communicated to the transmitter (not even dynamically), because the
sensor might get injured.
The sensor must not come into contact, for even a short time, with such medium whose
temperature is higher than the maximum value indicated in the User Manual and in the data
table, because it may get injured, and a hazard of explosion may occur.
The sensor must not come into contact, with such medium whose temperature is lower than the
minimum value indicated in the User Manual and in the data table, because it may get injured.
The pressure sensor can't mix with consistent media, for this must to escape be harded and
frost-bite of measured material because transmitter can damage.
The transmitter must be protected against strong physical impacts, as it might lead to an injury
of the sensor, and a failure of the system.
The penetration of vapours, saturated with chemical agents, through the opening P may cause
0
damages to the transmitter.
After the electric connector has been disassembled and assembled again, care must be taken
to ensure the tightness of the system; if the system fails to be tight, it might lead to leakage and
failures.
Only such power supply units should be used for operating the system, that belong to the
category of associated apparatus in terms of intrinsical safety, and that meet the specified
safety requirements.
Leakage of the process medium may cause grave injuries. Before the system is put under
pressure, screw the process connection to its place and tighten it, and check the tightness of
the system.
Always use an open-end wrench (size: 32) for doing the tightening after the connection is
established. Using of pipe wrench or any other tool for tightening may cause damages to the
transmitter.
The measured medium must be chemically compatible with the material of the seals.*
Only persons with appropriate qualifications may put the device into operation.
Upon installation and operation the specifications of the ATEX Certification must also be taken
into consideration.
* Please do not hesitate to contact the Manufacturer to obtain chemical resistance data when needed.
4