Kromschroeder DG smart User manual

CONTENTS
· Edition 03.23 · EN · 03251643
DE, EN, FR, NL, IT, ES, DA, SV, NO, PT, EL, TR, CS, PL, RU, HU – www.docuthek.com
Gas pressure sensor DG smart
1 Safety ................................1
2 Checking the usage .....................2
3 Installation ............................2
4 Electrical connection.....................3
5 User keys and display ...................4
6 LEDs (colour/flash code) .................4
7 Operation .............................5
8 Parameter ............................5
9 Settings ..............................7
10 Statistics.............................8
11 Information ...........................9
12 Service ..............................9
13 Changing the password .................9
14 Commissioning........................9
15 Tightness test ........................10
16 Checking the function..................10
17 Accessories .........................10
18 Maintenance.........................10
19 Assistance in the event of malfunction ..... 11
20 Technical data .......................12
21 Designed lifetime .....................14
22 Certification .........................14
23 Logistics............................14
24 Disposal ............................15
1 SAFETY
1.1 Please read and keep in a safe place
Please read through these instructions
carefully before installing or operating. Following the
installation, pass the instructions on to the operator.
This unit must be installed and commissioned in
accordance with the regulations and standards in
force. These instructions can also be found at www.
docuthek.com.
1.2 Explanation of symbols
1, 2, 3, a, b, c = Action
➔= Instruction
1.3 Liability
We will not be held liable for damage resulting from
non-observance of the instructions and non-com-
pliant use.
1.4 Safety instructions
Information that is relevant for safety is indicated in
the instructions as follows:
DANGER
Indicates potentially fatal situations.
WARNING
Indicates possible danger to life and limb.
CAUTION
Indicates possible material damage.
All interventions may only be carried out by qualified
gas technicians. Electrical interventions may only be
carried out by qualified electricians.
1.5 Conversion, spare parts
All technical changes are prohibited. Only use OEM
spare parts.
OPERATING INSTRUCTIONS

DG SMART · Edition 03.23
EN-2
2 CHECKING THE USAGE
For monitoring positive or differential pressures of
gas, air, flue gas or other non-aggressive gases.
This function is only guaranteed when used within
the specified limits– see page 12 (20 Technical
data). Any other use is considered as non-compliant.
2.1 Type code
DGS Gas pressure sensor
Relative pressure sensor measuring
range (positive pressure)
–No sensor
100 0–100mbar (0–39,4 "WC)
350 0–350mbar (0–138 "WC)
1000 0–1000mbar (0–394 "WC)
ANot fail-safe (ePSD Cat-A)
CFail-safe (ePSD Cat-C)
Differential pressure sensor measur-
ing range
–No sensor
50–5mbar (0–2 "WC)
50 0–50mbar (0–19,7 "WC)
100 0–100mbar (0–39,4 "WC)
RRp internal thread
NNPT internal thread
8Electr. connection: 2 x M12 plug con-
nectors
TX 10/100 Mbit/s (Fast Ethernet)
-M Modbus TCP

2.2 Part designations
6
12
5
4
3
9
1 2
8
7
11
10
1 Upper housing section
2 Lower housing section
3 Display
4 Status display
5 User keys
6 Voltage supply/4–20mA signal
7 Ethernet
8 P1, Rp 1/4 (1/4" NPT) gas/air connection
9 P2, Rp 1/4 (1/4" NPT) gas/air connection
10 Breather orifice
11 M1, M2 pressure test nipples
12 M4 screw terminal for device grounding
2.3 Type label
Gas type, switching pressure, max. inlet pressure,
ambient temperature, mains voltage and output
signals: see type label.
DGS ...
ps = ...
pmax = ...
T = ...
Input = ...
Output = ...
Elster GmbH, Made in Germany
3 INSTALLATION
3.1 Installation
CAUTION
Please observe the following to ensure that the
unit is not damaged during installation:
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
– Use approved sealing material only.
– Continuous operation with gases containing
more than 0.1%-by-vol. H2S or ozone
concentrations exceeding 200µg/m3accelerate
the ageing of elastomer materials and reduce
the service life.
– Condensation must not be allowed to get into
the housing. At subzero temperatures,
malfunctions/failures due to icing can occur.
– Avoid strong impact on the unit.
3.2 Installation position
Installation in the vertical or horizontal position, not
upside down. The recommended installation posi-
tion is vertical.
A zero point adjustment must be carried out during
the commissioning or maintenance procedure to
avoid discrepancies. The pressure value is auto-
matically saved together with the temperature value.
The zero point adjustment should be carried out in
normal operating temperature to obtain the best
possible accuracy and reduce thermal effects.

DG SMART · Edition 03.23
EN-3
3.3 Connections
P1
P3
P2
1or 2for positive
pressure Rp ¼ (¼" NPT)
3 Breather orifice
Relative pressure (positive pressure)
Connect Seal
P1 P2
P2 P1
Differential pressure
For the higher
absolute pressure For the lower absolute pressure
P1 P2
3.4 Connecting the pressure line
1 Disconnect the system from the electrical power
supply.
2 Close the gas supply.
3 Ensure that the pipeline is clean.
4 Purge the pipe.
➔Connect the pipeline so that a clear view of the
display is guaranteed.
➔The image may not show the actual installation
position.
Relative pressure sensor
Relative pressure (positive pressure) on port1
➔Seal port2.
a
2
b
1
Relative pressure (positive pressure) on port2
➔Seal port1.
a
2
b
1
c
2
Differential pressure sensor
Port 1 for the higher absolute pressure,
port 2 for the lower absolute pressure.
a
2
1
4 ELECTRICAL CONNECTION
1 Note the recommended tightening torques. See
page 13 (20.2.1 Recommended tightening
torque).
Voltage supply and 4–20mA signal
2 Disconnect the system from the electrical power
supply.
➔Connect the 24V DC voltage supply using the
M12 plug connector (plug/plug, 4-pin, A-coded).
1 2
3
4–20 mA
GND
4
+
GND
3
Communication interface (10/100 Mbit/s (Fast
Ethernet))
CAUTION
Please observe the following to ensure that the DG
SMART is not damaged during operation:
– If the Ethernet connection is not being used,
ensure that the sealing plug is still protecting the
connection. Otherwise, IP65 is no longer
ensured.
If the Ethernet connection is not being used, the
following steps are not necessary.
➔Connect the Ethernet using the M12 plug con-
nector (socket/coupling, 4-pin, D-coded).
2 1
4
TD+
RD-
3
RD+
TD-
4 5
➔To prevent interference signals through the
Ethernet connection, we recommend that the
functional earth is connected using a fine-strand
cable (max.4mm2).
6 Only loosen the M4 screw terminal.
7 8 9

DG SMART · Edition 03.23
EN-4
5 USER KEYS AND DISPLAY
➔Recorded data, parameters, settings and noti-
fications are output on the display in clear text.
Press and hold the OK key for around 1.5s to
unlock the display and open the menu. Pressing
the OK or any other key briefly will enable the
backlight.
➔The user keys are used for menu navigation and
parameter setting purposes.
Symbol Description
OK
Press the OKkey to confirm a selection
or query.
UP/DOWN navigation
to navigate in the menu or to increase/
reduce a value. Press and hold the key
to continuously increase or reduce a
value.
Reset
Press and hold the Reset key until the
display is reset.
Back
The Back key enables you to navigate
back in the menu hierarchy.
5.1 Backlight
Pressing any key for less than 0.5s switches on the
backlight. The backlight will switch off again 30s
after the last key is pressed.
6 LEDS (COLOUR/FLASH CODE)
Two changing colour LEDs show the status of the
MAX/MIN function or a message.
➔If the MAX/MIN function is disabled, the LEDs
remain off during normal operation.
Colour and flash code
➔The details refer to values which are parameter-
ized, see page 5 (8 Parameter).
Col-
our Meaning Mode Description
MAX LED
Red Alarm Perma-
nent
The pressure is
greater than or equal
to the setting value
for the “MAX alarm”
NFS parameter.
Yel-
low Warning Perma- nent
The pressure is
greater than or equal
to the setting value
for the “MAX
warning” NFS
parameter.
Green OK Perma-
nent
The pressure is less
than the setting
values for the “MAX
alarm”, “MAX
warning” and “MAX
switching value” NFS
parameters.
Red Record
Flash-
ing
(1Hz)
The pressure is
greater than the
setting value for the
“MAX switching
value” NFS
parameter.
MIN LED
Red Alarm Perma-
nent
The pressure is less
than or equal to the
setting value for the
“MIN alarm” NFS
parameter.
Yel-
low Warning Perma- nent
The pressure is less
than or equal to the
setting value for the
“MIN warning” NFS
parameter.
Green OK Perma-
nent
The pressure is
greater than the
setting values for the
“MIN alarm”, “MIN
warning” and “MIN
switching value” NFS
parameters.

DG SMART · Edition 03.23
EN-5
Col-
our Meaning Mode Description
Red Record
Flash-
ing
(1Hz)
The pressure is less
than the setting
value for the “MIN
switching value” NFS
parameter.
MAX LED and MIN LED
Yel-
low
Initializa-
tion
Perma-
nent
The unit is in
Initialization mode.
Yel-
low
Setting
the zero
point
Flash-
ing
(5Hz)
Ready for zero point
adjustment (no fault
may be active)
Red Alarm Perma-
nent Internal device error
Red
Overpres-
sure
detected
Flash-
ing
(1Hz)
Overpressure has
been detected and
the pressure is now
back below the limit
value (the unit must
be reset and
checked)
Red
Overpres-
sure
active
Flash-
ing
(5Hz)
Overpressure active.
The pressure must
be shut down.
Yel-
low
Perma-
nent
remote
reset
Flash-
ing
(1Hz)
Permanent remote
reset (a warning is
issued only if remote
reset is parameter-
ized)
Red
Too many
remote
resets
Flash-
ing
(1Hz)
Too many remote
resets (a fault
lock-out occurs only
if remote reset is
parameterized)
7 OPERATION
7.1 Status display/Locked display
The unit is in operating mode.
➔The display does not have to be switched
on. The current pressure value and, in certain
circumstances, a message are displayed imme-
diately.
50.0mbar
Limit ½:
20.0/60.0 mA:12
DG smart Eth:con
➔The device name and set limit values (MIN/MAX
function) are displayed in the bottom section.
Unlocking the display
➔Press and hold the OK key (for around 1.5s) to
unlock the display.
➔The main menu will appear in the display.
➔The user keys are used for menu navigation and
parameter setting purposes.
➔When it is first switched on, the DGsmart
automatically starts operating with the previously
parameterized settings or the default settings.
➔Password-protected settings can be edited by
logging into the DGsmart or the web server.
Login to edit password-protected parametes,
see page 9 (13 Changing the password).
Setting using the web server, see TI DGsmart,
section entitled “Web server”.
7.1.1 Display of bus protocol
The following is shown in the display if the Modbus
TCP connection is active/inactive:
Eth:... = not connected
Eth:con = connected
50.0mbar
Limit ½:
20.0/60.0 mA:12
DG smart Eth:con
For details of the ModbusTCP, see TI DGS, section
entitled “Modbus Holding Register”.
7.2 Main menu
Various parameters can be accessed using the
following menu hierarchy.
Information
Statistics
Service
Main Menu
Settings
Parameters
➔Press the UP/DOWN keys to navigate in the
menu. Press the OK key briefly to confirm your
selection.
➔Press the Back key briefly to return to the status
display.
8 PARAMETER
8.1 General
The “Parameters” menu option is divided into
“Safety parameters” (password-protected) and
“Non-safety parameters”.
The value ranges of the parameters can be edited
on the DGsmart or using the integral web server.
For details of the web server, see TIDGsmart, sec-
tion entitled “Web server”.

DG SMART · Edition 03.23
EN-6
8.2 Safety parameters
All safety parameters are password-protected. The user must be logged in to edit them.
Name Translation Value range Factory default
settings
page 6 (8.2.1 Sensor function) Sensor function
Transmitter
MIN
MAX
MAX and MIN
function
Transmitter
page 6 (8.2.2 MAX switching value) MAX switching
value Setting 0mbar
page 6 (8.2.3 MIN switching value) MIN switching value Setting 0mbar
page 6 (8.2.4 MAX reset) MAX reset
Automatic
Manual
Remote
Automatic
page 6 (8.2.5 MIN reset) MIN reset
Automatic
Manual
Remote
Automatic
page 6 (8.2.6 MAX delay time) MAX delay time Setting 0s
page 6 (8.2.7 MIN delay time) MIN delay time Setting 0s
page 6 (8.2.8 Overpressure value) Overpressure value Setting 100% of the
measuring range
page 6 (8.2.9 Zero adjustment) Zero adjustment Setting 0mbar
8.2.1 Sensor function
Sensor function
Parameter settings:
Transmitter
OK Cancel
3. Event ...
Value
range Description
Trans-
mitter
The measurement is output using the
analog signal. No check on MIN/MAX.
MAX Transmitter function including checking
the set MAX switching point.
MIN Transmitter function including checking
the set MIN switching point.
MAX
and MIN
Transmitter function including checking
the set MAX and MIN switching points.
8.2.2 MAX switching value
This parameter is used to set the switching point for
the MAX check.
8.2.3 MIN switching value
This parameter is used to set the switching point for
the MIN check.
8.2.4 MAX reset
Value
range Description
Auto-
matic
Reset logic for the MAX function is set
to automatic.
Manual Reset logic for the MAX function is set
to manual. (Only local reset is possible.)
Remote
Reset logic for the MAX function is set
to remote control using bus communi-
cation. (Local reset is also possible.)
8.2.5 MIN reset
Value range Description
Automatic Reset logic for the MIN function is
set to automatic.
Manual
Reset logic for the MIN function is
set to manual. (Only local reset is
possible.)
Remote
Reset logic for the MIN function is
set to remote control using bus
communication. (Local reset is
also possible.)
8.2.6 MAX delay time
This parameter is used to set the delay time from
0–10s for exceeding the MAX switching value.
8.2.7 MIN delay time
This parameter is used to set the delay time from
0–10s for falling below the MIN switching value.
8.2.8 Overpressure value
This parameter is used to enter the value for the
maximum overpressure at which the pressure sen-
sor DGsmart will switch to fault mode.
8.2.9 Zero adjustment
A zero point adjustment must be carried out during
setting, commissioning or maintenance work.
The zero point adjustment should be carried out in
normal operating temperature to obtain the best
possible accuracy and reduce thermal effects.

DG SMART · Edition 03.23
EN-7
8.3 Non-safety parameters
Name Translation Value range Factory default
settings
page 7 (8.3.1 MAX warning) MAX warning Setting 0mbar
page 7 (8.3.2 MAX alarm) MAX alarm Setting 0mbar
page 7 (8.3.3 MIN warning) MIN warning Setting 0mbar
page 7 (8.3.4 MIN alarm) MIN alarm Setting 0mbar
page 7 (8.3.5 Communication) Kommunikation
IP address*
Subnet* Gateway*
Mac address*
192.168.0.200
* Login required.
8.3.1 MAX warning
This parameter is used to set the switching point
for the MAX warning. The colour of the LED then
changes to yellow.
8.3.2 MAX alarm
This parameter is used to set the switching point for
the MAX alarm. The colour of the LED then changes
to red.
8.3.3 MIN warning
This parameter is used to set the switching point
for the MIN warning. The colour of the LED then
changes to yellow.
8.3.4 MIN alarm
This parameter is used to set the switching point for
the MIN alarm. The colour of the LED then changes
to red.
8.3.5 Communication
Value
range Description
IP address This parameter enables the IP
address to be edited.
Subnet This parameter enables the subnet
IP address to be edited.
Gateway This parameter enables the gateway
IP address to be edited.
MAC
adress
This fixed parameter displays the
MAC address.
9 SETTINGS
Display
Passwort
Settings
Display
Name Translation Value range Factory default
settings
page 8 (9.1 Measuring unit) Measuring unit mbar, kPa, PSI,
inch WC mbar
page 8 (9.3 Decimal Separator) Decimal separator Point “.” or comma
“,” Point “.”
page 8 (9.4 Brightness) Brightness Setting: Display
brightness 100%
page 8 (9.2 Temperature unit) Temperature unit C, F, K C
page 8 (9.5 Language) Language English English
Password
Display Translation Value range Factory default
settings
page 8 (9.6 Password) Password xxxx 0000

DG SMART · Edition 03.23
EN-8
9.1 Measuring unit
Display settings
Measuring unit
Decimal separator .
Brightness 100%
Temperature C
mbar
Value range Description
mbar mbar is displayed.
kPa kPa is displayed.
PSI PSI is displayed.
Inch WC Inch WC is displayed.
This parameter is used to set the measuring unit to
display the pressure. The parameterization and data
transfer continue to take place using the specified
unit.
9.2 Temperature unit
Value range Description
C Celsius is displayed.
F Fahrenheit is displayed.
K Kelvin is displayed.
9.3 Decimal Separator
Display: “.” or “,” as the decimal separator.
9.4 Brightness
This parameter enables the display brightness to be
adjusted.
9.5 Language
The user and display language is English.
9.6 Password
A four-digit numerical password enables the user to
restrict access to the unit.
Password-protected parameters can only be edited
on the DGsmart or using the web server if the user
is logged in.
10 STATISTICS
Name Translation Value range
page 8 (10.1 Event history)
page 8 (10.2 Device statistics)
page 9 (10.3 Customer statistics)
Event history
Device statistics
Customer statistics
Information on the event
history, device and customer
statistics are display in plain
text.
page 9 (10.4 Clear event history)* Clear event history Resetting the event history
page 9 (10.5 Clear customer statistics)* Clear customer statistics Resetting the customer
statistics
* Login required.
10.1 Event history
The event history saves the last 10events. As soon
as an event (for example an error) occurs in the unit,
the current status is saved in the history.
The additional information in the history are as
follows:
– Time of the event
– Error code (in the event of an error)
– Pressure
– Mains voltage
– Temperature
Event history
1. Power On
2. Error #32
...
3. Power On
1. Power On
Time: 29h 4min
P: 10mbar
VDC: 24.0V Temp.: 23.1C
10.2 Device statistics
Device statistics are provided for diagnostic purpos-
es and cannot be reset by the customer. They cover
the entire service life of the unit as they cannot be
reset.
– Counters
– Error
– Duration
– Values
Counter
1. Error #32 8
2. Error #78 5
Errors
1. Error 12
2. Error 27
3. Error 1
4. Error 3
Device Endurance
1.
Max Power on 4h 30min
2. Max Overtemp. 0h 10min
3. Power on ttl 29h 30min
1. Max Temp. 32.2C
2. Min Temp. 5.0C
3. Max Pressure 78.1mbar
4. Min Pressure 0.1mbar

DG SMART · Edition 03.23
EN-9
10.3 Customer statistics
The same counters are evaluated in the customer
statistics as in the device statistics and the statistics
can be reset by the customer.
10.4 Clear event history
The event history can be reset by the user (login
required).
10.5 Clear customer statistics
The customer statistics can be reset by the user
(login required).
11 INFORMATION
Name Translation Value range
page 9
(11.1 Device
name)
page 9
(11.2 Network)
page 9
(11.3 Firmware)
Device name
Network
Firmware
The device
name, network
configuration
and firmware
are displayed in
plain text.
11.1 Device name
The device name is displayed.
11.2 Network
The current network configuration is displayed.
11.3 Firmware
The current software is displayed.
12 SERVICE
Name Value range
page 9 (12.1
Firmware) Firmware upgrade.
12.1 Firmware
The Service section can only be accessed via the
web server. See TI DG smart, section entitled “Web
server”.
12.2 Resetting event history/customer statis-
tics
The event history and customer statistics are pass-
word-protected areas.
Customer statistic
Delete customer statistic
Statistics Menu
Devise statistic
Event history
Clear event history
1 Select the statistics that you wish to reset.
2 Confirm the reset with OK.
13 CHANGING THE PASSWORD
1 Select “Settings” in the main menu.
Settings
Display
Passwort
2 Select the “Password” parameter.
– – – –
Login
Enter current passwort:
OK Cancel
*
A four-digit numerical password restricts access to
the unit. The password can be changed. The default
value is 0000.
CAUTION
Incorrect use!
Please note the following to avoid damage:
– Change the password immediately after
commissioning!
Enter the password.
3 Press the appropriate cursor key to change the
password numbers.
4 Press the OK key to confirm the number and go
to edit the next entry box.
5 When all 4 numbers have been set, press the OK
key to save the new password.
➔You can also select “Cancel” using the cursor
keys and exit the input process.
14 COMMISSIONING
A zero point adjustment must be carried out at
operating temperature during the commissioning
process.
1 Vent the gas pipe.
2 Read the pressure value and enter it in Parame-
ters -> Safety parameters -> Negative value
(enter password when prompted) and confirm
with OK.
3 Go to the main menu using the Back key.
➔The parameters are saved and the unit is
restarted.
➔The current ambient pressure will be saved as
the zero point adjustment.
➔The unit is now ready for operation.

DG SMART · Edition 03.23
EN-10
15 TIGHTNESS TEST
Check all gas ports used for tightness.
1 Shut off the downstream gas pipeline close to
the valve.
2 Open the valve and the gas supply.
➔Test pressure N2: <1.5x withstand pressure for
max. 15minutes.
3 N24
16 CHECKING THE FUNCTION
We recommend a function check once a year.
1 Check the transmitter and/or MIN/MAX function
using the parameterized switching pressures.
2 Carry out a zero point adjustment at operating
temperature. See page 9 (14 Commission-
ing).
3 Carry out a reference pressure measurement.
See page 10 (18 Maintenance), relative and
differential pressure measurement.
17 ACCESSORIES
17.1 Test key PIA
To test the min. pressure switch, the DG SMART
can be vented in its switched state using the PIA
test key (contains non-ferrous metals).
R
¼
Rp
¼
Order No.: 74329466
Click
TEST
17.2 Tube set
To be used with air only.
Tube set with 2m PVC tube, 2duct connection
flanges with screws, R1/4 and R1/8 connecting
nipples.
Order No.: 74912952.
17.3 Fastening set with screws, U-shape
bracket
M4 x 10
M4 x 12
50 (1.97")
47,5 (1.87")
75 (2.95")
30 (1.18")
20
(0.79")
25 (0.98")
45 (1.77")
20
(0.79")
24 (0.94")
43 -0,3 (1.69")
64 (2.52")
40 (1.57")
6 (0.24")
16
(0.63")
39 (1.53")
4,20 +0,1
(0.17")
5,2
(0.2") 10
(0.4")
Order No.: 74915387
18 MAINTENANCE
In order to ensure smooth operation, check the
tightness and function of the pressure sensor every
year.
➔After carrying out the maintenance work, check
for tightness.
A zero point adjustment must be carried out at
operating temperature after the maintenance work
has been completed to ensure the best possible
accuracy.
18.1 Pressure test nipples
P1
P3
M1
M2
P2

DG SMART · Edition 03.23
EN-11
Relative pressure measurement (positive
pressure)
➔The relative pressure is measured on a pressure
test nipple, M1 or M2.
➔The unused pressure test nipple remains closed.
Differential pressure measurement
The differential pressure is measured on both pres-
sure test nipples, M1 and M2.
18.2 Service
Process data are shown in the Service parameter
and a firmware upgrade can be carried out.
The Service parameter can only be accessed via the
web server. See TI DG smart, section entitled “Web
server”.
19 ASSISTANCE IN THE EVENT OF
MALFUNCTION
➔The backlight switches on automatically in the
event of a fault.
A warning or fault is shown in clear text in the bot-
tom section of the display.
50.0mbar
Overpressure MAX
1 Press the OK button briefly (<1.5s) to display
the fault code.
Fault
Overpressure MAX
Module: 12
Error Code: 94
2 Press the Back key briefly to return to the status
display.
➔Faults may be cleared only using the measures
described below.
CAUTION
Please note the following to avoid damage:
– Fault-clearance must only be undertaken by
authorized trained personnel.
➔If these measures do not help to rectify the fault:
remove the unit and return it to the manufacturer
for inspection.
? Faults
! Cause
• Remedy
? Too many resets?
! More than 5resets have been conducted within
the last 15minutes, either automatically or man-
ually.
• Consecutive fault caused by a previous fault
whose actual cause has not been remedied.
– Pay attention to previous fault messages.
– Remedy cause.
➔The cause will not be remedied by performing a
reset every time a fault lock-out occurs.
➔Check whether remote reset complies with
standards (EN746 allows resetting only under
supervision) and correct if necessary.
• Press and hold the reset key. See page 12
(19.1 Resetting).
? Permanent remote resets?
! Warning: The unit is being permanently reset
remotely by the bus communication.
• Check the actuation for the remote reset and
cancel the signal.
? Mains voltage?
! The function for reading the mains voltage is
defective.
• Reset the unit once.
• If the measure described above does not help,
remove the unit and return it to the manufac-
turer for inspection.
? Under-/Overvoltage?
! Supply voltage too low (<24VDC-20%) or too
high (>24VDC+20%).
• Operate the unit within the permitted mains
voltage range. See page 12 (20 Technical
data).
? Warn. Undertemp.?
! The ambient temperature is very low (in the
range from 0 to 5°C).
• Ensure that the ambient temperature is within
the permitted range. See page 12 (20
Technical data).
? Warn. Overtemp.?
! The ambient temperature is very high (in the
range from 65 to 70°C).
• Ensure that the ambient temperature is within
the permitted range. See page 12 (20
Technical data).
? Undertemperature?
! The ambient temperature is below the minimum
limit for the unit (<0°C).
• Ensure that the ambient temperature is within
the permitted range. See page 12 (20
Technical data).
? Overtemperature?
! The ambient temperature is above the maximum
limit for the unit (>70°C).
• Ensure that the ambient temperature is within
the permitted range. See page 12 (20
Technical data).
? MIN pressure?
! The pressure has fallen below the set MIN
switching pressure.
• Ensure that the inlet pressure is at an ade-
quate level.
• If the MIN reset function has been parameter-
ized (manual or remote), reset the unit.

DG SMART · Edition 03.23
EN-12
? MAX pressure?
! The pressure has exceeded the set MAX switch-
ing pressure.
• Ensure that the inlet pressure is within the
permitted range.
• If the MAX reset function has been parameter-
ized (manual or remote), reset the unit.
? Underpressure?
! Underpressure has been detected. The pressure
is below the permitted measuring range.
➔The unit has been operated outside the technical
limits and may be damaged.
• Test the function to ensure that the unit is
operating perfectly.
• Ensure that the inlet pressure is within the
permitted range. Then reset the unit.
? Overpressure?
! Overpressure has been detected. The pressure
is above the permitted measuring range.
➔The unit has been operated outside the technical
limits and may be damaged.
• Test the function to ensure that the unit is
operating perfectly.
• Ensure that the inlet pressure is within the
permitted range. Then reset the unit.
? 4–20mA interrupted?
! 4–20mA signal missing/interrupted.
• Check and/or establish the connection for the
4–20mA signal. See page 3 (4 Electrical
connection).
? 4–20mA impedance error?
! Excessive impedance (internal network resist-
ance) in the measuring system.
• Check the measuring impedance. See
4–20mA output signal load impedance, page
13 (20.3 Electrical data).
? Faulty parameterization?
! Faulty parameterization.
• Check parameter settings and adjust them if
necessary.
? Inconsistent FS parameters?
! An inconsistent safety parameter has been iden-
tified.
• Check the parameter set and edit it if neces-
sary.
? Inconsistent NFS parameters?
! An inconsistent non-safety parameter has been
identified.
• Check the parameter set and edit it if neces-
sary.
? Internal error?
! An internal device error occurred.
• Reset the unit once.
• If the measure described above does not help,
remove the unit and return it to the manufac-
turer for inspection.
19.1 Resetting
➔Mains voltage is switched on.
Press and hold the Reset key until the display is
reset.
Resetting faults:
Press and hold the reset key for at least 0.5s.
19.2 Restoring factory settings
CAUTION
Data loss!
All customer parameter assignments and the
firmware are reset to default settings.
1 Press and hold both cursor keys when the mains
voltage is switched on (POWER ON) until
“Upgrading MCA...” appears in the display.
2 Release the cursor keys.
➔The reset may take up to 5minutes.
20 TECHNICAL DATA
20.1 Ambient conditions
Icing, condensation and dew in and on the unit are
not permitted.
Permitted ambient temperature in operation: 0 to
+60°C (32 to 140°F).
Long-term use in the upper ambient temperature
range accelerates the ageing of the elastomer ma-
terials and reduces the service life (please contact
manufacturer).
Storage and transport temperatures: 20 to 40°C (68
to 104°F).
Medium temperature: 0 to +60°C (32 to 140°F).
Avoid direct sunlight or radiation from red-hot sur-
faces on the unit. Note the maximum medium and
ambient temperatures!
Avoid corrosive influences, e.g. salty ambient air or
SO2.
The unit may only be stored/installed in enclosed
rooms/buildings.
The unit is suitable for a maximum installation height
of 2000m AMSL.
Enclosure: IP65.
This unit is not suitable for cleaning with a high-pres-
sure cleaner and/or cleaning products.
20.2 Mechanical data
Gas types for relative pressure sensor: natural gas,
town gas, LPG (gaseous), flue gas, biogas (max.
0.1%-by-vol. H2S) and air.
Gas types for differential pressure sensor: air.
The gas must be clean and dry in all temperature
conditions and must not contain condensate.
Max. inlet pressure pmax. = withstand pressure,
measuring range and max. deviations, see page
14 (20.4 Measuring range).
Maximum leakage rate QL= max. 20cm3/h.

DG SMART · Edition 03.23
EN-13
Upper housing section: steel fibre reinforced PBT
plastic with low gas release.
Lower housing section: AlSi 12.
Rp 1/4 (1/4"NPT) connecting thread.
Weight: 450 g
20.2.1 Recommended tightening torque
Component Tightening torque
[Ncm]
Rp 1/4 (1/4" NPT) connection on
aluminium lower section 1300
T15 test point screw 150
T20 ground screw 100
M12 x 1 protective cap 60
20.3 Electrical data
100% duty cycle (continuous operation)
Safety class: 3
Mains voltage: 24VDC, ±20%.
Overvoltage category III
Communication interface: 10/100 Mbit/s (Fast
Ethernet)
Bus protocol: Modbus TCP
Electrical connection
Voltage supply and 4–20mA signal: M12 plug
connector (plug/plug, 4-pin, A-coded).
4–20mA output signal load impedance: ≤500Ω
Ethernet: M12 plug connector (socket/coupling,
4-pin, D-coded)
Functional earth: ground terminal for connecting
fine-strand cables up to 4mm2.
Internal fuse: replaceable fuse (slow-acting, 200mA)
20.3.1 Output signal coding
The 4–20mA output supplies the current pressure in
the form of an analog value. The pressure measur-
ing range is scaled to 4–20mA.
The NAMUR NE43 (standardization of the signal
level for the failure information of digital transmitters
with an analog output signal) is used as a reference
for standardized error information (in addition to the
measuring information).
Current
range
[mA] Description
22.0 Overpressure detected
21.0 MAX switching pressure detected
21.0 Upper error range
20.5 Upper tech range
20.0 Upper nominal range
4.0 Lower nominal range
3.8 Lower tech range
3.6 Lower error range
3.0 MIN switching pressure detected
2.0 Over-/undervoltage or over-/undertem-
perature detected
1.0 Underpressure detected
0 Output off (internal or device error)

DG SMART · Edition 03.23
EN-14
20.4 Measuring range
Measuring
range [mbar]
Withstand
pressure
[mbar] MAX/MIN* Total error
band [%FS]
Ü*
Max.
deviation at
0–70°C
[mbar]*
Sensor type
Relative pressure (positive pressure)
0–100 ≥ 500 Stainless steel,
media-insulated
0–350 ≥ 1000 Stainless steel,
media-insulated
0–1000 ≥ 1000 Stainless steel,
media-insulated
Differential pressure
0–5 ≥ 100 Not media-insulated
0–50 ≥ 500 PCB mounted, not
media-insulated
0–100 ≥ 500 PCB mounted, not
media-insulated
* Values will be supplied after the qualification procedure (long-term function test)
21 DESIGNED LIFETIME
This information on the designed lifetime is based
on using the product in accordance with these
operating instructions. Once the designed lifetime
has been reached, safety-relevant products must be
replaced.
Designed lifetime (based on date of manufacture) in
accordance with EN1854 for DG SMART: 10years.
You can find further explanations in the applicable
rules and regulations and on the afecor website
(www.afecor.org).
This procedure applies to heating systems. For ther-
moprocessing equipment, observe local regulations.
22 CERTIFICATION
22.1 Certificate download
Certificates – see www.docuthek.com
22.2 Declaration of conformity
We, the manufacturer, hereby declare that the prod-
uct DG SMART with product ID No. CE-(Data still
missing -> in progress) complies with the require-
ments of the listed Directives and Standards.
Directives:
– 2014/35/EU – LVD
– 2014/30/EU – EMC
– 2011/65/EU – RoHS II
– 2015/863/EU – RoHS III
Regulation:
– (EU) 2016/426 – GAR
Standards:
– EN1854:2010
The relevant product corresponds to the tested type
sample.
The production is subject to the surveillance proce-
dure pursuant to Regulation (EU) 2016/426 AnnexIII
paragraph3.
Elster GmbH
22.3 REACH Regulation
The device contains substances of very high con-
cern which are listed in the Candidate List of the
European REACH Regulation No.1907/2006. See
Reach list HTS at www.docuthek.com.
22.4 China RoHS
Directive on the restriction of the use of hazardous
substances (RoHS) in China. Scan of the Disclo-
sure Table China RoHS2, see certificates at www.
docuthek.com.
23 LOGISTICS
Transport
Protect the unit from external forces (blows, shocks,
vibration).
Transport temperature: see page 12 (20 Technical
data).
Transport is subject to the ambient conditions
described.
Report any transport damage on the unit or packag-
ing without delay.
Check that the delivery is complete.
Storage
Storage temperature: see page 12 (20 Technical
data).
Storage is subject to the ambient conditions de-
scribed.
Storage time: 6months in the original packaging
before using for the first time. If stored for longer
than this, the overall service life will be reduced by
the corresponding amount of extra storage time.

DG SMART · Edition 03.23
EN-15
24 DISPOSAL
Devices with electronic components:
WEEE Directive 2012/19/EU – Waste Electrical
and Electronic Equipment Directive
At the end of the product life (number of operat-
ing cycles reached), dispose of the packaging and
product in a corresponding recycling centre. Do not
dispose of the unit with the usual domestic refuse.
Do not burn the product.
On request, old units may be returned carriage paid
to the manufacturer in accordance with the relevant
waste legislation requirements.

DG SMART · Edition 03.23
EN-16
© 2023 Elster GmbH We reserve the right to make technical modifications in the interests of progress.
The Honeywell Thermal Solutions family of products includes
Honeywell Combustion Safety, Eclipse, Exothermics, Hauck,
Kromschröder and Maxon. To learn more about our products, visit
ThermalSolutions.honeywell.com or contact your Honeywell Sales
Engineer.
Elster GmbH
Strotheweg 1, D-49504 Lotte
T [phone]
[email protected]
www.kromschroeder.com
Global centralized service deployment coordination:
T [phone] or -555
[email protected]
Translation from the German
FOR MORE INFORMATION