Samson Media 6 Service manual

Differential Pressure Meter
Media 6
Media 6 Z
Mounting and
Operating Instructions
EB 9527-3 EN
Firmware V3.03
Edition February 2007
Media 6 with attached valve block

Contents
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 8
1.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1 Arrangement of devices for liquid level measurement . . . . . . . . . . 12
2.2 Arrangement of devices for flow rate measurement . . . . . . . . . . . 12
2.3 Media 6 indicating unit . . . . . . . . . . . . . . . . . . . . . . . . 12
2.4 Differential pressure lines . . . . . . . . . . . . . . . . . . . . . . . 12
2.5 Orifice plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.2 Valve block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.3 Shut-off and equalizing valves . . . . . . . . . . . . . . . . . . . . . 15
2.5.4 Equalizing tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5.5 Accessories for connection. . . . . . . . . . . . . . . . . . . . . . . 15
3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Display and operating elements . . . . . . . . . . . . . . . . . . . . 18
4.1.1 Switching display mode . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Liquid level measurement . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Flow rate measurement . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3 Draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Write protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Selecting gas type. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Checking zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Checking the measuring range (span) . . . . . . . . . . . . . . . . . 24
6.5 Setting the limit switches . . . . . . . . . . . . . . . . . . . . . . . . 25
6.5.1 Max. filling limit during operation . . . . . . . . . . . . . . . . . . . 25
6.5.2 Alarm contacts A1 and A2 . . . . . . . . . . . . . . . . . . . . . . 26
6.6 Switching LCD ON/OFF. . . . . . . . . . . . . . . . . . . . . . . . 26
6.7 Ammeter function . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2EB 9527-3 EN
Contents

7 Communication using the memory pen . . . . . . . . . . . . . . . . 27
7.1 Exchanging data using the memory pen . . . . . . . . . . . . . . . . 27
7.2 Communication using a PC . . . . . . . . . . . . . . . . . . . . . . 28
8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9 Servicing explosion-protected devices . . . . . . . . . . . . . . . . . 31
10 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
EC type examination certificates. . . . . . . . . . . . . . . . . . . . 35
Display with operating elements. . . . . . . . . . . Fold-out page at end
EB 9527-3 EN 3
Contents

Bold print indicates sections that require par-
ticular attention.
Note!
Gives supplementary information and hints.
Note!
Essential information or instructions that need
to be observed to ensure proper handling
and operation
Bold print also indicates information and in-
structions relating to safety.
Caution!
Disobeying instructions may result in prop-
erty damage.
Warning!
Disobeying instructions may result in prop-
erty damage or even personal injury.
Danger!
Avoid any contact with live parts!
Disobeying instructions may result in
property damage or personal in-
jury, even pose a danger to life.
4EB 9527-3 EN
Symbols
Symbols used in these mounting and operating instructions

Warning!
4The device is to be assembled, started up or operated only by trained and experienced per-
sonnel familiar with the product. According to these mounting and operating instructions,
trained personnel is referred to as individuals who are able to judge the work they are as-
signed to and recognize possible dangers due to their specialized training, their knowledge
and experience as well as their knowledge of the applicable standards.
4Explosion-protected versions of this device are to be operated only by personnel who have
undergone special training or instructions or who are authorized to work on explosion-pro-
tected devices in hazardous areas. See also note in section 9.
4Any hazards that could be caused in the device by the process medium or the operating
pressure are to be prevented by means of the appropriate measures. In addition, make sure
that the device is used only in areas where the operating pressure and temperatures do not
exceed the operating values that are based on the sizing data submitted in the order. The
Media 6 Differential Pressure Meter is not approved for measuring flammable gases and
liquids in Zone 0.
4Proper shipping and storage are assumed.
4Note!
Devices with a CE marking fulfil the requirements of Directives 94/9/EC and 89/336/EEC.
The declaration of conformity is available on request.
EB 9527-3 EN 5
Safety instructions
Safety instructions

6EB 9527-3 EN
Firmware changes
Table 1 · Firmware versions
Changes of the device's firmware compared to previous version
Old New
A 2.03/B 2.03 A 2.10/B 2.10
Limit switches Limit switches A1 and A2 are preset by the software to function as either
min or max alarms. They can be configured separately using the keys.
Filling limit during
operation (UCW) Filling limit during operation can be adjusted on the operating keys re-
gardless of the limit switches.
A 2.10/B 2.10 A 2.11/B 2.11
Error code Current output of Media 6 is set to ≤3.6 mA.
A2.11/B2.11 V3.02
LCD Use the and keys to switch the LCD on or off (“LCD ON” or
“LCD OFF”).
Gas and medium code Gas and medium code with up to 8 characters
Error code Error code changed. Changed response when confirming errors. Device
errors are logged in error history (refer to page 27).
Operating mode New operating modes: counting flow rate; differential pressure
Units for flow rate Flow rate displayed in “.../h” or “.../min”
Units for static pressure
(PTANK) The following units were added: mbar, bar, kPa, psi, mmH20, cmH20, mH20, inH20.
DP0 value Pressure for 4 mA signal
Display “LOAD” Replaced by display of version no. ”V3.02”
V3.02 V3.03
Display mode "Counting flow rate" operating mode:
Standard display shows meter reading.

EB 9527-3 EN 7
Firmware changes
Changes of the device's firmware compared to previous version
Old New

1 Design and principle of operation
The Media 6 Differential Pressure Meters are
used to measure and indicate differential
pressure as well as derived measured
variables for gases and liquids.
Measuring tasks
–Liquid level measuring on pressure ves-
sels, particularly suitable for cryogenic
liquefied gases
–Differential pressure measuring between
flow and return flow pipe
–Pressure drop measuring on valves and
filters
– Flow rate measuring based on differential
pressure method
The device consists of the dp cell with measur-
ing diaphragm, measuring springs that
match the measuring range as well as the in-
dicating unit equipped with an LCD to indi-
cate certain operating states.
The differential pressure Δp=p
1–p 2gener-
ates a force on the measuring dia-
phragm (1.1), which is balanced by the mea-
suring springs (1.2). The movement of the
measuring diaphragm and lever (1.3), which
is proportional to the differential pressure, is
led out of the pressure chamber over the elas-
tic disc (1.4) and converted into an electric
signal by the travel sensor (2).
Evaluating the data saved in the FRAM (4),
the electric signal is processed by a micropro-
cessor (3). The microprocessor controls both
the display (7) and D/A converter (9) for the
output signal, which is issued asa4to20mA
two-wire transmitter signal at connector A.
The serial interface (10) allows the device to
be configured with the help of SAMSON's
TROVIS-VIEW Configuration and Operator
Interface using a special memory pen or a ca-
ble connection to a PC.
The user-specific data are saved in the mem-
ory (FRAM) (4) until they are overwritten
again. Data can also be backed up. As a re-
sult, the operating data can easily be ex-
changed on site between Media 6 and the
memory pen, and vice versa.
The memory pen can be programmed using a
PC and SAMSON's TROVIS-VIEW software.
The operating data allow the differential
pressure to be converted into values propor-
tional to the tank capacity or flow rate1); these
values are displayed or issued asa4to
20 mA DC signal.
Using the DIP switches (6), four saved gas
types and different write protection functions
for saved data can be selected.
Three operating keys (5) are used to adjust
different operating functions (zero and span
adjustment, filling limit during operation, limit
switch and test function settings etc.) as well
as set different operating states (load or save
operating values).
8EB 9527-3 EN
Design and principle of operation
1) Count pulses in Media 6 Z

EB 9527-3 EN 9
Design and principle of operation
0
20
40 60
80
100
%
m3
#
7
6
5
3
2
1.1
1.2
9
8
10
1.5
4
1.4
1.3
1.2
1
p
2
p
1
_+
Fig. 1 · Functional diagram
Connector A
UB= 12 V to 36 V DC
IA= 4 to 20 mA
Min/max alarm A1
Connector B
Min/max alarm A2 or
pulse output in Media 6 Z
Serial interface
Indicating unit with LCD
1 dp cell
1.1 Measuring diaphragm
1.2 Measuring springs
1.3 Lever
1.4 Elastic disc
1.5 Diaphragm axis
2 Travel sensor
3 Microprocessor
4 Memory
5 Keys
6 DIP switches
7 Indicating unit with LCD
8 Limit switch / external
pulse output
9 D/A converter
10 Serial interface
µP FRAM
dp cell
Valve block
with pres-
sure gauge

1.1 Technical data
Table 2 · Technical data
Differential pressure meter
Measuring range mbar 0 to
100 0 to 160 0 to 250 0 to 400 0 to 600 0 to 10001) 0 to
16001) 0 to 25001) 0 to 36001)
Adjustable span in mbar
Class ±1.0 % from
to ≤250
≥125 ≤400 ≥100 ≤600 ≥150 ≤1000 ≥250 ≤1600 ≥320 ≤2500 ≥500 ≤3600 ≥720
Class ±1.6 % from
to ≤100
≥60 <160 ≥60 <125 ≥50 <100 ≥80 <150 ≥120 <250 ≥200
Class ±2.5 % from
to <60
≥352) <60
≥32
Nominal pressure PN 50, can be overloaded up to 50 bar on one side
Display LCDØ90
Characteristic Output and display either linear or root-extracting depending on operating mode
Deviation from
terminal-based conformity < ±1.0 % or < ±2.5 % (including hysteresis) depending on selected span
Sensitivity < 0.25 % or < ±0.5 % depending on selected span
Influence of static pressure < 0.03 % / 1 bar
Influence of ambient tempera-
ture between –20 and +70 °C < ±0.2 %/10 K on zero
< ±0.2 %/10 K on span
Limit switches Two configurable software limit switches or one software limit switch complying with
EN 60947-5-6 and pulse output3)
Control circuit,
adjustable in steps of 1 % Values correspond to connected switching amplifier according to EN 60947-5-6,
e.g. KFA6- SR2- Ex2.W or KFA-SR2- Ex1.W
Switching accuracy 1 % relating to MCN or SCN4)
Dead band, approx. < 0.6 %
Pulse output (Media 6 Z) Max. possible count frequency 120 pulses/min or 7200 pulses/h5)
floating transistor contact for connection of external counter
Input voltage UDC 50 V
Input current IDC 80 mA
Residual current Ioff at 24 V < 0.1 mA
Voltage drop at 10 mA < 3.5 V
Voltage drop at 80 mA < 4.8 V
Pulse length Ton 200 ms
1) Class accuracy of 0.6 % can be assumed in measuring ranges 1000, 1600, 2500 and 3600 mbar for spans of
≤100 % to ≥50 % of the nominal range
2) If the values remain below this span, the class accuracy of Class 2.5 may be exceeded
3) Media 6 Z is equipped with one software switch A1 according to EN 60947-5-6 and one pulse output
4) MCN = Max. Capacity Nominal (max. tank capacity); SCN = Save Capacity Nominal (capacity up to overflow)
5) Determined flow rate is as follows: Q= Qm
Difference of countswithin reading period
Pulses h
/×ax
10 EB 9527-3 EN
Design and principle of operation

Warning!
Media 6 is not approved for measuring flammable gases and liquids in Zone 0!
Devices intended for oxygen service are labeled
The manufacturer has cleaned and assembled all devices for oxygen service under special con-
ditions. When replacing parts that come into contact with oxygen, e.g. measuring springs,
wear appropriate gloves and make sure that the parts do not get into contact with oil or grease.
When returning devices for oxygen service for repair, the sender assumes full responsibility that
the devices are handled to meet all requirements stipulated by VBG 62 or similar regulations
until they are handed over to the manufacturer. Otherwise, SAMSON AG does not accept any
responsibility.
EB 9527-3 EN 11
Design and principle of operation
Version 5006-...0 5006-...1
Two-wire connection 4 to 20 mA output
Permissible load RBin Ohm RB=U-12V
0.020 A
B
Output circuit –Intrinsic safety according to
PTB 00 ATEX 2074 (see certificates)
Supply voltage UBfor
two-wire transmitter 12 to 36 V DC 12 to 28 V DC (in combination with
intrinsically safe power circuit only)
Permissible ambient temperature –40 °C to +70 °C T6; –20 to +60 °C
T5; –20 to +70 °C
Permissible storage temperature –40 °C to +80 °C
Degree of protection DIN VDE 0470 IP 65
Weight Approx. 3 kg without valve block · Approx. 5 kg with valve block
Materials
Housing CW617N (brass) or CrNi steel
Measuring diaphragm and seals ECO, NBR (other on request)
Measuring springs
CrNi steel
Diaphragm discs and functional parts
Lever
Indicating unit Polycarbonate
All pressures as gauge pressures · All errors and deviations in % of adjusted span

2 Installation
2.1 Arrangement of devices for
liquid level measurement
Schematic drawings 1 to 3 (see Fig. 2)
In arrangements as illustrated by schematic
drawing 2, the additional height z influences
the measurement. As a result, the height must
be as low as possible.
No restrictions apply to dimension K (com-
pensation height) illustrated in schematic
drawing 3; it can be as high as required by
the conditions in the plant.
2.2 Arrangement of devices for
flow rate measurement
The decision whether the meter is to be
mounted above or below the measuring point
or whether equalizing tanks are required de-
pends on the type of process medium and the
specific conditions in the plant. The installa-
tion drawing shows standard and reverse in-
stallation. Standard installation is preferable
in any case. Reverse installation can be used
only when there is no other possibility, partic-
ularly for steam measurements. Refer to
VDE/VDI 3512 Sheet 1 for details.
2.3 Media 6 indicating unit
Make sure that the high-pressure line is con-
nected to the high-pressure connection and
that the low-pressure line is attached to the
low-pressure connection.
Special fittings are required to connect the
differential pressure lines. Depending on the
device arrangement, seal any connections left
unused with plugs or vent plugs.
Carefully clean the connections before attach-
ing the differential pressure lines. Never flush
the device with compressed air or pressurized
water!
At the place of installation, mount the meter to
a pipe, wall or mounting plate, ensuring that it
is free of vibration.
Use the fastening element with clamp for
mounting to vertical or horizontal pipes. For
wall mounting, use the fastening element with-
out clamp. A mounting bracket (see dimen-
sional drawing on page 32) is required for
panel mounting.
2.4 Differential pressure lines
Install the differential pressure lines (pipes with
12 mm outside Ø) as illustrated in Fig. 3. Ob-
serve the proper arrangement! Use appropri-
ate screw fittings to ensure that the lines do not
leak.
Install line sections, which would usually run
horizontally, with a constant downward slope
of at least 1:20, starting the slope either at the
orifice plate or at the point where venting is
possible. The smallest permissible bending ra-
dius is 50 mm.
Thoroughly flush the differential pressure lines
before connecting them to the device. Make
sure that the high-pressure line is connected to
the high-pressure connection and that the
low-pressure line is attached to the low-pres-
sure connection.
12 EB 9527-3 EN
Installation

EB 9527-3 EN 13
Installation
Fig. 2 · Arrangement of devices
hH
z
h
Hh
K
H
Y
+– +– +–
Illustration with SAMSON valve block
Schematic drawing 1
Measurements in cryogenic
systems (liquefied gases)
Schematic drawing 2
Measurements on pressure
vessels with condensing or
non-condensing cushion
Schematic drawing 3
Measurements on open vessels
with low-lying meter
1) 1) 1)
Measuring liquids Measuring steam Measuring gases
Orifice plate assembly Equalizing tank
Separation chamber
1) SAMSON valve blocks can be installed above the dp cell to match connections (+) to (+) and (–) to (–).
Installation:
Standard Reverse Standard Standard Reverse
H Measuring range
h Measured height
z Additional height
K Compensation height
Flow rate measurement
Liquid level measurement

2.5 Orifice plate assembly
The direction of flow must match the arrow.
Unobstructed pipe sections are required up-
stream and downstream of the orifice plate
assembly. For the orifice tubes delivered by
SAMSON, these sections are ensured by the
weld-on calibration pipes. For orifice flanges,
the unobstructed pipe section upstream of the
orifice plate is specified in the order confir-
mation. Make sure the orifice plate assembly
as well as the seals are properly aligned with
the pipeline.
Do not install any control valves that con-
stantly change the operating state of the pro-
cess medium (e.g. manually operated control
valves or temperature regulators) upstream of
the orifice plate assembly. The operating state
should match the conditions calculated dur-
ing sizing as closely as possible. It is, how-
ever, favorable to install equipment that
keeps the operating state constant (e.g. pres-
sure regulators) upstream of the assembly.
2.5.1Accessories
We recommend to install a shut-off valve as
well as an equalizing valve in the differential
pressure lines. They can be used to shut off
both differential pressure lines and to bypass
the indicating unit when checking zero.
2.5.2Valve block
SAMSON offers a valve block composed of
three valves (see Fig. 4) as accessory equip-
ment. The valve block is flanged directly to the
bottom of the dp cell.
When measuring the flow rate in liquids and
gases, the SAMSON valve block can also be
mounted above the dp cell, so that the con-
nection arrangement of (+) to (+) and (–) to (–)
can be maintained. Due to this reverse instal-
lation, the pressure gauge connection can no
longer be used and is to be sealed with an
O-ring and a G ½ - LH screw cap.
14 EB 9527-3 EN
Installation
Fig. 3 · Orifice plate assembly
For gas For steam For liquids
Attachment of differential pressure lines on orifice plate assembly
Type 91
Orifice Tube
65
d
Inlet 20 to 50 xd
Outlet 5 xd
Type 90 Orifice Flange
Warning!
Max. perm. operating pressure of
40 bar for Type 90 and Type 91

2.5.3Shut-off and equalizing
valves
As an alternative to the SAMSON valve
block, the two shut-of valves as well as the by-
pass valve/equalizing valve can also be in-
stalled as illustrated in Fig. 5.
2.5.4Equalizing tanks
Equalizing tanks that establish a constant liq-
uid column are required when measuring
steam.
When measuring liquids, they are only
needed when the indicating unit is mounted
above the measuring point.
For gas measurements, they are required as
chambers for condensate separation when
the indicating unit is installed below the mea-
suring point.
2.5.5Accessories for connection
The meters are delivered without screw fit-
tings (oxygen versions are protected against
contamination by four NBR blanking plugs).
Required screw fittings, sealing or vent screws
as well as screw joints with restrictions to
dampen medium-induced vibration (particu-
larly for measuring gases) must be ordered
separately.
Note!
The screw fittings and SAMSON valve blocks
with their associated order numbers are listed
in Data Sheet T 9555 EN.
EB 9527-3 EN 15
Installation
–+
Fig. 5 · Arrangement of shut-off and
Fig. 4 · SAMSON valve block equalizing valves for flow rate measurement
1
2
to the indicating unit
Liquid level measurement
Test connection
Shut-off valves (–)
Pressure gauge
connection
Shut-off valve (+)
Bores for sealing wires
Equalizing valve
Media 6
Flow rate measurement
From the measuring point
1 Shut-off valves
2 Equalizing valve
dp line
connection

3 Electrical connection
Danger!
4
For electrical installation, you are required to observe the relevant
electrotechnical regulations and the accident prevention regulations that ap-
ply in the country of use. In Germany, these are the VDE regulations and the
accident prevention regulations of the employers’ liability insurance.
4
The following regulations apply for installation in hazardous areas:
EN 60079-14:2003; VDE 0165 Part 1:1998 ”Electrical apparatus for ex-
plosive gas atmospheres” and EN 50281-1-2: VDE 0165 Part 2:1999
”Electrical apparatus for use in the presence of combustible dust”.
4
For intrinsically safe electrical equipment approved in accordance with
Directive 79/196/EEC, the data specified in the certificate of conformity ap-
ply for the connection of intrinsically safe circuits.
4
For intrinsically safe electrical equipment approved in accordance with
Directive 94/9/EC, the data specified in the EC type examination certificate
apply for the connection of intrinsically safe circuits.
4
Warning!
The terminal assignment specified in the certificate must be adhered to!
Switching the assignment of the electrical terminals may cause the explosion
protection to become ineffective! Do not loosen enameled screws in or on the
housing.
4
In hazardous areas, use only meters approved in accordance with ATEX to
check the current on the test connection (Test – +), see Fig. 10.
4
The serial interface (see Fig. 10) is not approved for use in hazardous areas.
As a result, use only the intrinsically safe SAMSON memory pen to transfer
data.
Note on the selection of cables and wires
To run several intrinsically safe circuits in one multi-core cable, observe section 12 of
EN 60079-14; VDE 0165:1998. Note especially that, for commonly used insulating materials
(e.g. polyethylene), the radial thickness of the conductor insulation must be at least 0.2 mm. The
diameter of a single wire of a flexible conductor must not be smaller than 0.1 mm. The conduc-
tor ends must be protected against unlaying, e.g. by using wire-end ferrules.
When two separate cables are used for connection, an additional cable gland can be installed.
Cable entries left unused must be sealed with plugs.
Devices used in ambient temperatures down to –40 °C are to be fitted with metal cable entries.
16 EB 9527-3 EN
Electrical connection

Connector A
Two-wire connection for 4 to 20 mA signal.
Permissible load RB:
RB=U12V
0.020 A
B– Ohm
Normally, the supply voltage UBis 24 V DC.
Taking into account the supply conductor re-
sistance directly at the terminals of the device
connector, the supply voltage may be be-
tween 12 V and 36 V DC.
Connector B
Connection of two software limit switches in
type of protection EEx ia IIC for control cir-
cuits according to NAMUR on switching am-
plifier according to EN 60947-5-6
Maximum values:
Ui= 20 V, Ii= 60 mA, Pi= 250 mW
Ci= 5.3 nF, Li= 8 µH
Media 6 Z includes only one software limit
switch (Alarm 1) and one pulse output (at po-
sition "Alarm 2"), which is proportional to the
tank capacity, to control an external counter.
Test connection (see also section 9)
Connect an ammeter to the test terminals +
and – to test the output signal during calibra-
tion. While doing so, the output signal of the
two-wire circuit is not interrupted. Make sure
the ammeter provides a load of < 0.4 V DC
for the test connection.
Caution!
Degree of protection IP 65 becomes ineffec-
tive when the cable socket is removed from
the device connector!
Protect the device connector against moisture
during installation and transport by keeping
the cable socket part screwed on and sealed.
EB 9527-3 EN 17
Electrical connection
1
3
2
4
1+
2–
3+
4–
~
1+
2–
1
3
2
Fig. 6 · Terminal assignment of DIN 43650 device connectors, form A
Connector A · Two-wire connection
for standardized 4 to 20 mA signal
Cable socket
Order no.: 8831-0503
Sockets for Ø 8 to 10 mm cable
Connector B · Two software limit
switches or one software limit switch
and one pulse output in Media 6 Z
Cable socket
Order no.: 8831-0500
Limit switches with switching amplifier
Supply unit
Min/max A1
Min/max A2
Network

Table 3 · Overview of functions for software limit switches A1 and A2 at connector B
Proximity switch
for ... 1 min/1 max contact
(gas tapping / tank filling) 2 min contacts (gas tapping) 2 max contacts (tank filling)
Alarm contact A1 A2 A1 A2 A1 A2
Value falls below
limit High resistance Low resistance High resistance High resistance Low resistance Low resistance
Value exceeds
limit Low resistance High resistance Low resistance Low resistance High resistance High resistance
The limit switches A1 and A2 can be separately configured to function as min or max alarms.
Low-resistance contact
Switching signal “ON” · Function: contact closed or output effectively conducting,
power consumption ≥3 mA
High-resistance contact
Switching signal “OFF” · Function: contact open or output effectively non-conducting,
power consumption ≤1 mA
4 Operation
4.1 Display and operating elements
All necessary data and measured values saved in the memory of Media 6 are indicated on the
LCD.
The operating elements are located on the bottom panel behind the protective cover, which can
be opened:
Up key
Down key
Enter key
Apart from that, four DIP switches to select the gas type and write protection functions (also see
page 22) are included.
Further details on the display and operating elements can be found on the fold-out page at the
end of these instructions.
18 EB 9527-3 EN
Operation

4.1.1Switching display mode
Depending on the operating mode, each pressing of the key allows you to switch between
the standard display and up to eight other parameters.
After eight seconds or after the marquee has finished scrolling, the display automatically returns
to the default display.
GKZ Standard mode (e.g. gas code – O2– and current tank content)
Δ
P Current differential pressure
MCN Max. capacity nominal (max. tank capacity)
MCN/R 100 % tank volume or max. possible flow rate, set to 20 mA signal
SCN Save capacity nominal. Geometric tank volume up to overflow/gauge pipe
SCN/R 100 % tank volume set to 20 mA signal
UCW Usable capacity work (filling level during operation)
Δ
P100 Max. differential pressure
Δ
P0 Min. differential pressure
PTANK Nominal tank pressure. Value corresponds to the pressure assigned to the density (liq-
uid) according to the vapor pressure graph. If
MCN and SCN are calculated on the ba-
sis of 1 bar, "1 bar" is displayed for
PTANK .
TKZ Tank identifier
FLOW Flow rate
ERROR Error code; automatically displayed when an error occurs (see section 8)
OFF Special signal when opening the equalizing valve, I = 3.6 mA
EB 9527-3 EN 19
Operation
Table 4 · Operating mode
Operating mode 〉Liquid level
measurement Flow rate measurement Counting flow rate Differential pres- sure measurement
Standard
display
Standard mode GKZ GKZ GKZ GKZ
Displayed values Liquid level Flow rate Meter reading Diff. pressure
Further
display
modes
1ΔPΔP FLOW ΔP0
2 MCN (/R) MCN (/R) ΔPΔP100
3 SCN (/R) ΔP100 MCN (/R) PTANK
4 UCW PTANK ΔP100 TKZ
5ΔP0 TKZ PTANK
6ΔP100 TKZ
7 PTank
8 TKZ

5 Start-up
–For start-up observe Figs. 4 and 5 on
page 15.
Initial position of the valves on the valve block
upon delivery:
–High-pressure shut-off valve (+) and
low-pressure shut-off valve (–) open.
–Equalizing valve closed.
Caution!
In cryogenic applications, the process me-
dium circulates when the equalizing valve is
open, causing the valve block to freeze over.
Note!
If necessary, check zero at the dp cell (see
section 6.3) and put the device back into op-
eration.
Note!
In measuring operation, make absolutely sure
that the equalizing valve is closed and the
shut-off valves are open.
5.1 Liquid level measurement
1. Open low-pressure line by slow turning.
2. Close equalizing valve or bypass of the
valve block.
3. Open high-pressure line by slow turn-
ing.
5.2 Flow rate measurement
When measuring steam
Make sure that the steam does not have direct
contact with the measuring diaphragm of the
device. As a result, screw off the differential
pressure lines below the shut-off valves or
valve block and fill the device with water. Al-
ternatively, make sure the shut-off and equal-
izing valves or valve block are shut off and
wait approx. 20 min after the system was
started up (steam in system) until condensate
has collected in the differential pressure lines
above the valve and up to the orifice plate.
1. Slowly open high-pressure line.
2. Close equalizing valve or bypass of the
valve block.
3. Open low-pressure line.
4. Wait a little. Open both vent screws of
the dp cell one after the other until the
escaping condensate is bubble free.
Retighten the screws.
Vent the equalizing tanks in the same
way. Slightly tapping the housing of the
indicating unit or the equalizing tanks
helps the air escape.
5. Check zero (see section 6.3) and put the
device back into operation.
20 EB 9527-3 EN
Start-up