Keller-druck GSM-2 Ei User manual

www.keller-druck.com
Operating Instructions
GSM-2 Ei
The GSM-2 Ei GPRS modem enables pressure measure-
ments in areas exposed to gas explosion hazards when
used in conjunction with an intrinsically safe pressure
transmitter.
System description
The system description document pursuant to
EN 60079-25 comprises:
· Block diagram 81902.11
„GSM-2 Ei system description”
· Standard GSM-2 operating instructions
(www.keller-druck.com)
· Product information on INTRINSPAK safety barriers
· Pressure transmitter manual
· These GSM-2 Ei operating instructions
Components
The GSM-2 Ei has a stable metal housing (GSM-2 Ei
Box) and comprises a battery-powered GSM-2 with ad-
ditional integrated safety barriers. It can be connected to
one of the following KELLER pressure transmitters with an
RS485 interface:
· Series 33 X Ei, 35 X Ei, 36 XW Ei, PD-33 X Ei or PD-
39 X Ei pressure transmitter with a three-wire voltage
output compliant with EC type examination certicate
KEMA 04 ATEX 1081 X for use in zones 0, 1 or 2, or
· Series 41 X Ei or 46 X Ei pressure transmitter with a
3-wire voltage output compliant with EC type examination
certicate PTB 06 ATEX 2011 for use as a partition wall
device between zones 0 and 1, or for zone 1 or 2
In contrast to a standard GSM-2, only one transmitter can
be connected.
The GSM-2 Ei has 2 integrated INTRINSPAK safety bar-
riers manufactured by R. Stahl:
· 9001/01-168-075-101 for supplying the transmitter and
· 9001/01-120-024-001 for the RS485 interface
Installation location
Pressure transmitters can be installed in the explosive
atmosphere in accordance with their marking. The GSM-2
Ei Box must be installed outside of the explosive area.
Block diagram
See diagram 81902.11 „GSM-2 Ei system description”.

Assembly
GSM-2 Ei Box and transmitter connection
When mounting, please pay attention to the operating
manual of the pressure transmitter to be connected.
Screw the GSM-2 Ei Box to a at surface using the holes
provided so that an unobstructed reception of GSM
signals is possible. Insert the SIM card and replace the
cover over the battery and internal GSM module. Then
connect the pressure transmitter to the safety barriers as
shown in the block diagram. The analogue transmitter out-
put +OUT is not used and must be connected to the unoc-
cupied parking terminal adjacent to the two safety barriers.
Earthing
If the pressure transmitter is earthed through the trans-
mitter housing, do not connect the cable shielding on the
box side to earth; otherwise the cable shielding must be
connected to earth inside the GSM-2 Ei Box.
The GSM-2 Ei Box must be earthed. This is achieved
either via the metal housing (housing screws) or via a
separate equipotential lead of at least 4 mm2. The lead
must be connected from the earth connection on one of
the two safety barriers to earth. To do so, remove the
blind plug from the cable screw connection, feed the cable
through the opening and screw tight.
Power supply
An integrated Tadiran TL-6937 battery with an operating
voltage of 3,9 V supplies power to the GSM-2 Ei. An inter-
nal step-up switch boosts the battery voltage to 12 V. This
is then supplied to the pressure transmitter. The batteryʼs
lifetime depends on the measurement rate and the scope
of data transfer. The battery will last up to 10 years at a
measurement rate of 1 measurement per hour and 1 data
transmission per day. We recommend replacing the bat-
tery every 5 years.
Wiring
The transmitter cable is an intrinsically safe circuit and
must be wired separately from other circuits that are not
intrinsically safe.
Overvoltage and lightning protection
The GSM-2 Ei does not have integrated lightning protec-
tion. The user must protect the GSM-2 Ei and pressure
transmitter cable in accordance with national overvoltage
directives (e.g. lightning strike). If the pressure transmitter
is installed in zone 0, an overvoltage protection must be
installed at a maximum distance of 1 m from the starting
point of zone 0.
Replacing the battery
Remove the cover from the metal box, loosen the 4 screws
and remove the cover plate. The Tadiran TL-6937 battery
is connected to the GSM moduleʼs PCB via a wire and a
Molex plug. Pull the plug out of the PCB and plug in the
new battery. Pay attention to correct plug polarity! Replace
the cover plate over the battery and GSM module. Re-
place the cover on the metal box. Pay attention to the cor-
rect orientation of the cover. The seal in the housing cover
must match up with its counterpart.
12.02.2015
M. Schlimper – Quality Manager
www.keller-druck.com www.keller-druck.com
KELLER AG
St. Gallerstrasse 119 ·CH-8404 Winterthur
Tel. [phone] ·Fax [phone]
KELLER GmbH
Schwarzwaldstrasse 17 ·D-79798 Jestetten
Tel. [phone] ·Fax [phone]