E6 20 DTR.APC.APR.ALW.03(ENG)
Appendix MID
For electrical connection should be use twisted pair cable; shielded or not shielded, flexible, with diameter
5mm ≤ ≤ 9mm, complies to ATEX standards. Example of the type of cable is shown below.
*) Maximum conductors cross-section: 2.5mm.
Grounding to the transmitter should be performed according to the gas-volume conversion device
documentation. To transmitter grounding should be used external earthing terminal if grounding by pressure
connector is not enough. An exemplary method of grounding of pressure measuring system is shown in Figure
1b.
5.4. Cable entries (glands).
Transmitters in the MID version are equipped with cable entries which meet the ATEX requirements
(see Appendix Exi.ATEX and Appendix Exd.ATEX) and the requirements of EN 12405-1:2005+A2:2010.
In order to facilitate the adaptation of transmitter installation parameters for user-specific installation
requirements, in agreement with the user, transmitters can be supplied without glands and plugs. Then user
must verify and approve applied own cable inlets and plugs which will use for compliance with the requirements
of ATEX, IP and EN 12405-1:2005+A2:2010.
6. APC-2000ALW for MID application. Measurement ranges and metrological
parameters
6.1. APC-2000ALW for MID application. Measurement ranges. Overpressure
*) According to EN 12405-1:2005+A2:2010 pressure units: bar and MPa can be used interchangeably.
Measuring range of transmitters is setting by the manufacturer. Blocking against changes in the transmitter
settings can be made as follows:
systemically, by HART System, activated by a configuration program (Report 2) and protected by
password;
"spec MID locking" done with local buttons on the transmitter with a local menu (command MID_WP).
It is possible to set the measuring range form 10 … 100bar up to 10 … 70bar. Measuring range 10 … 100bar
of transmitters is setting standard, but it can be lower (up to 10 … 70bar) at the user’s request, or user can set
the measure himself after blockade removing. Change the measure range shuld be realized before the
transmitter installing. The measurement system for recalibration should be make according to Figure 2, and
using PC, HART modem and Raport2 programme - see in p.10 attachment MID.
For pressure transmitters complying to MID Parts Certificate, a manufacturer's standard "spec locking"
is activated, but in agreement with the customer transmitters are not blocked and then the locking
should be on by manufacturer of conversion devices.
Local buttons are protected by a screw display cover, which is sealed. When "spec MID locking" is done can
change only certain parameters of the transmitters, ie: HART transmitter address and the time constant,
and can be made additional entries identifying the transmitter associated with its place of installation.
The proceedings relating to the sealing set out in p. 8.
The pressure transmitter, as a part of the gas conversion of type 2, in accordance with the
requirements of the MID Directive must be protected against unauthorized manipulation by its producer
or manufacturer of the gas volume converter. Sealing of the transmitters is done by its manufacturer or,
by agreement with the customer, they may not be sealed, then sealing should be made by
manufacturer of gas volume conversion.
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