Endress+Hauser CNGmass DCI User manual

BA140D/06/en/10.09
71100107
valid as of version
V 3.06.00 (Device software)
Operating Instructions
CNGmass DCI
MODBUS RS485
Coriolis mass flow measuring system
For fueling with compressed natural gas (CNG)

CNGmass DCI MODBUS RS485 Table of contents
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 5
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Installation, commissioning and operation . . . . . . . . 5
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Notes on safety conventions and icons . . . . . . . . . . . 6
1.6 Symbols on nameplates . . . . . . . . . . . . . . . . . . . . . . 6
2 Identification . . . . . . . . . . . . . . . . . . . . 7
2.1 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Nameplate of the transmitter . . . . . . . . . . . . 7
2.1.2 Nameplate of the sensor . . . . . . . . . . . . . . . 8
2.1.3 Additional nameplate for suitability for
custody transfer measurement . . . . . . . . . . . 8
2.1.4 Nameplate for connections . . . . . . . . . . . . . 9
2.1.5 Additional sign - position of the rupture disk 10
2.2 Certificates and approvals . . . . . . . . . . . . . . . . . . . 10
2.3 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . 10
3 Installation . . . . . . . . . . . . . . . . . . . . . 11
3.1 Incoming acceptance, transport and storage . . . . . . 11
3.1.1 Incoming acceptance . . . . . . . . . . . . . . . . . 11
3.1.2 Transport . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.2 Inlet and outlet runs . . . . . . . . . . . . . . . . . 11
3.2.3 Vibrations . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.4 Limiting flow . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . 12
3.3.1 Turning the transmitter housing . . . . . . . . 12
3.3.2 Installing the wall-mount housing . . . . . . . 13
3.3.3 Turning the local display . . . . . . . . . . . . . . 15
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 15
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 MODBUS RS485 cable specifications . . . . . . . . . . . 16
4.1.1 Shielding and grounding . . . . . . . . . . . . . . 17
4.2 Connecting the remote version . . . . . . . . . . . . . . . 18
4.2.1 Connecting cable for sensor/transmitter . . 18
4.2.2 Cable specification, connecting cable . . . . . 18
4.3 Connecting the measuring unit . . . . . . . . . . . . . . . 19
4.3.1 Transmitter connection . . . . . . . . . . . . . . . 19
4.3.2 Terminal assignment . . . . . . . . . . . . . . . . . 21
4.4 Degree of protection . . . . . . . . . . . . . . . . . . . . . . . 21
4.5 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 22
5 Operation . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Quick operation guide . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Display and operating elements . . . . . . . . . . . . . . . 24
5.2.1 Readings displayed (operation mode) . . . . . 25
5.2.2 Additional display functions . . . . . . . . . . . . 25
5.2.3 Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3 Brief guide to the function matrix . . . . . . . . . . . . . . 27
5.3.1 General notes . . . . . . . . . . . . . . . . . . . . . . 28
5.3.2 Enabling the programming mode . . . . . . . . 28
5.3.3 Disabling the programming mode . . . . . . . . 28
5.4 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4.1 Type of error . . . . . . . . . . . . . . . . . . . . . . . 29
5.4.2 Error message type . . . . . . . . . . . . . . . . . . . 29
5.4.3 Confirming error messages . . . . . . . . . . . . . 30
5.5 MODBUS RS485 communication . . . . . . . . . . . . . 30
5.5.1 MODBUS RS485 technology . . . . . . . . . . . 30
5.5.2 MODBUS telegram . . . . . . . . . . . . . . . . . . 32
5.5.3 MODBUS function codes . . . . . . . . . . . . . 33
5.5.4 Maximum number of writes . . . . . . . . . . . 33
5.5.5 MODBUS register addresses . . . . . . . . . . . . 34
5.5.6 MODBUS error messages . . . . . . . . . . . . . . 36
5.5.7 MODBUS auto-scan buffer . . . . . . . . . . . . . 37
5.6 Operating options . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.6.1 Operating program "FieldCare" . . . . . . . . . . 41
5.6.2 Device description files for
operating programs . . . . . . . . . . . . . . . . . . 41
5.7 Switching hardware write protection on/off . . . . . . 42
6 Commissioning . . . . . . . . . . . . . . . . . . 43
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2 Switching on the measuring device . . . . . . . . . . . . 43
6.3 Quick Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.3.1 Quick Setup "Commissioning" . . . . . . . . . . 44
6.3.2 Quick Setup "Pulsating Flow" . . . . . . . . . . . 46
6.3.3 Quick Setup "Gas measurement" . . . . . . . . 49
6.3.4 Quick Setup "Communication" . . . . . . . . . . 51
6.3.5 Data back-up/transfer . . . . . . . . . . . . . . . . 53
6.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.4.1 Configuring the device address . . . . . . . . . . 54
6.4.2 Configuring the terminating resistors . . . . . 55
6.4.3 Current output: active/passive . . . . . . . . . . 56
6.4.4 Pulse/frequency output . . . . . . . . . . . . . . . 57
6.4.5 Relay contacts:
Normally closed/Normally open . . . . . . . . 58
6.5 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.5.1 Zero point adjustment . . . . . . . . . . . . . . . . 59
6.6 Memory (HistoROM) . . . . . . . . . . . . . . . . . . . . . . . 60
6.6.1 HistoROM/S-DAT (sensor-DAT) . . . . . . . . 60
6.6.2 HistoROM/T-DAT (transmitter-DAT) . . . . 60
7 Custody transfer measurement . . . . . . 61
7.1 Suitability for custody transfer measurement, approval
by the Standards Authorities, repeated calibration due to
legal metrology controls . . . . . . . . . . . . . . . . . . . . 61
7.1.1 Approval for custody transfer . . . . . . . . . . . 61
7.1.2 Special features of working in the custody
transfer mode . . . . . . . . . . . . . . . . . . . . . . 61
7.2 Definition of terms . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.3 Verification process . . . . . . . . . . . . . . . . . . . . . . . . 63
7.3.1 Setting up custody transfer mode . . . . . . . . 63
7.3.2 Disabling custody transfer mode . . . . . . . . . 65

CNGmass DCI MODBUS RS485 Table of contents
4Endress+Hauser
8 Maintenance . . . . . . . . . . . . . . . . . . . . 66
8.1 External cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9 Accessories . . . . . . . . . . . . . . . . . . . . . 67
9.1 Measuring principle-specific accessories . . . . . . . . . 67
9.2 Service-specific accessories . . . . . . . . . . . . . . . . . . 67
10 Troubleshooting . . . . . . . . . . . . . . . . . 68
10.1 Troubleshooting instructions . . . . . . . . . . . . . . . . . 68
10.2 System error messages . . . . . . . . . . . . . . . . . . . . . . 69
10.3 Process error messages . . . . . . . . . . . . . . . . . . . . . . 74
10.4 Process errors without messages . . . . . . . . . . . . . . 75
10.5 Response of outputs to errors . . . . . . . . . . . . . . . . . 76
10.6 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
10.6.1 Removing and installing
printed circuit boards . . . . . . . . . . . . . . . . . 78
10.6.2 Replacing the device fuse . . . . . . . . . . . . . . 82
10.7 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
10.8 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
10.9 Software history . . . . . . . . . . . . . . . . . . . . . . . . . . 83
11 Technical data . . . . . . . . . . . . . . . . . . . 84
11.1 Technical data at a glance . . . . . . . . . . . . . . . . . . . 84
11.1.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . 84
11.1.2 Function and system design . . . . . . . . . . . . 84
11.1.3 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
11.1.4 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
11.1.5 Power supply . . . . . . . . . . . . . . . . . . . . . . . 86
11.1.6 Performance characteristics . . . . . . . . . . . . 86
11.1.7 Operating conditions: Installation . . . . . . . . 87
11.1.8 Operating conditions: Environment . . . . . . 87
11.1.9 Operating conditions: Process . . . . . . . . . . 87
11.1.10 Mechanical construction . . . . . . . . . . . . . . 88
11.1.11 Human interface . . . . . . . . . . . . . . . . . . . . 89
11.1.12 Certificates and approvals . . . . . . . . . . . . . 89
11.1.13 Ordering information . . . . . . . . . . . . . . . . 90
11.1.14 Accessories/spare parts . . . . . . . . . . . . . . . 90
11.1.15 Documentation . . . . . . . . . . . . . . . . . . . . 90
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

CNGmass DCI MODBUS RS485 Safety instructions
Endress+Hauser 5
1 Safety instructions
1.1 Designated use
The measuring device described in these operating instructions may be used for measuring the mass
or volume flow measurement of Compressed Natural Gas (CNG).
Resulting from incorrect use or from use other than that designated the operational safety of the
measuring devices can be suspended. The manufacturer accepts no liability for damages being
produced from this.
1.2 Installation, commissioning and operation
Note the following points:
• Installation, connection to the electricity supply, commissioning and maintenance of the
measuring device must be carried out by trained, qualified specialists authorized to perform such
work by the facility's owner-operator. The specialist must have read and understood these
Operating Instructions and must follow the instructions they contain.
• The device must be operated by persons authorized and trained by the facility's owner-operator.
Strict compliance with the instructions in the Operating Instructions is mandatory.
• The CNGmass DCI is a device for measuring gas under high pressure. Therefore, professional
design of the system and proper installation of all pressure-bearing parts is of vital importance for
long-term safe operation.
• Endress+Hauser will be happy to assist in clarifying the corrosion resistance properties of materials
wetted by special fluids, including fluids used for cleaning. However, small changes of
temperature, concentration or degree of contamination in the process can result in differences in
corrosion resistance. Therefore, Endress+Hauser provides no warranty and assumes no liability
with regard to corrosion resistance of fluid wetted materials in any given application. The user is
responsible for choosing suitable fluid wetted materials in the process.
• The installer must ensure that the measuring system is correctly wired in accordance with the
wiring diagrams.
• Invariably, local regulations governing the maintenance and repair of electrical devices apply.
1.3 Operational safety
Note the following points:
• Measuring systems for use in hazardous environments are accompanied by separate "Ex
documentation", which is an integral part of these Operating Instructions. Strict compliance with
the installation instructions and ratings as stated in this supplementary documentation is
mandatory. The symbol on the front of this supplementary Ex documentation indicates the
approval and the inspection body (0Europe, NEC/CEC1), NEPSI).
• The housing of the sensor is equipped with a rupture disk to prevent the pressure in the sensor
housing from increasing in the event of an error. As long as the adhesive label (→ä8) is intact,
the rupture disk is also intact.
• The measuring device complies with the general safety requirements in accordance with
EN 61010, the EMC requirements of IEC/EN 61326, and NAMUR recommendation NE 21.
• The manufacturer reserves the right to modify technical data without prior notice. Your
Endress+Hauser distributor will supply you with current information and any updates to these
Operating Instructions.
• Danger - hot surfaces! Hot fluids passing through the measuring tube increase the surface
temperature of the sensor housing. Temperatures close to the fluid temperature must be
expected. If fluid temperatures are high, take suitable measures to protect against scalding from
the hot surfaces.
1) NEC (National Electrical Code) / CEC (Canadian Electrical Code)

Safety instructions CNGmass DCI MODBUS RS485
6Endress+Hauser
1.4 Return
The following procedures must be carried out before a flowmeter requiring repair or calibration, for
example, is returned to Endress+Hauser:
• Always enclose a duly completed "Declaration of Contamination" form. Only then can
Endress+Hauser transport, examine and repair a returned device.
• Enclose special handling instructions if necessary, for example a safety data sheet as per
Regulation (EC) 1907/2006 REACH.
• Remove all residues. Pay special attention to the grooves for seals and crevices which could
contain residues. This is particularly important if the substance is hazardous to health, e.g.
flammable, toxic, caustic, carcinogenic etc.
!Note!
You will find a preprinted "Declaration of Contamination and Cleaning" form at the back of this
operating manual.
#Warning!
• Do not return a measuring device if it is not absolutely certain that all traces of hazardous
substances have been removed, e.g. substances which have penetrated crevices or diffused
through plastic.
• Costs incurred for waste disposal and injury (burns etc.) due to inadequate cleaning will be
charged to the owner-operator.
1.5 Notes on safety conventions and icons
The devices are designed to meet state-of-the-art safety requirements, have been tested, and left the
factory in a condition in which they are safe to operate. The devices comply with the applicable
standards and regulations in accordance with EN 61010 "Safety requirements for electrical
equipment for measurement, control and laboratory use". They can, however, be a source of danger
if used incorrectly or for other than the designated use.
Consequently, always pay particular attention to the safety instructions indicated in these Operating
Instructions by the following icons:
#Warning!
"Warning" indicates an action or procedure which, if not performed correctly, can result in injury
or a safety hazard. Comply strictly with the instructions and proceed with care.
"Caution!
"Caution" indicates an action or procedure which, if not performed correctly, can result in incorrect
operation or destruction of the measuring device. Comply strictly with the instructions.
!Note!
"Note" indicates an action or procedure which, if not performed correctly, can have an indirect
effect on operation or trigger an unexpected response on the part of the device.
1.6 Symbols on nameplates
The following symbol appears on nameplates (refer to the corresponding documentation):
In the case of devices for potentially explosive atmospheres, a documentation code appears,
representing supplementary Ex documentation that it is mandatory to read.

CNGmass DCI MODBUS RS485 Identification
Endress+Hauser 7
2 Identification
2.1 Device designation
The "CNGmass DCI" flow measuring system consists of the following components:
• Transmitter
•Sensor
Two versions are available:
• Compact version: transmitter and sensor form a single mechanical unit.
• Remote version: transmitter and sensor are installed separately.
2.1.1 Nameplate of the transmitter
A0011936
Fig. 1: Nameplate specifications for the transmitter (example)
1 Order code/serial number: See the specifications on the order confirmation for the meanings of the individual
letters and digits
2 Power supply/ frequency: 85 to 260 V AC/ 50 to 60 Hz
Power consumption: 15 VA / 15 W
3 Available inputs / outputs
4Reservedforinformation on special products
5 Ambient temperature range
6 Degree of protection
Switzerland
4153 Reinach
CNGmass DCI
Order Code:
85-260 AVC
Ident No.:
Ser.No.: 8 F15-XXXXXXXXXXXXD
XXXXXXXXXXXX IP67 / NEMA/Type 4X
N12895
-40°F<Tamb<140°F
-40°C<Tamb<+60°C Ta+ 0°C/ °F118
i
15VA/W50-60Hz
MODBUS RS485,
RELAY, RELAY STATUS-IN
2009
1
2
3
4
6
5

Identification CNGmass DCI MODBUS RS485
8Endress+Hauser
2.1.2 Nameplate of the sensor
A0011590
Fig. 2: Nameplate specifications for the sensor (example)
1 Order code/serial number: See the specifications on the order confirmation for the meanings of the individual
letters and digits
2 Calibration factor
3 Flange nominal diameter
4 Material
5 Max. fluid temperature
6Reservedforinformation on special products
7 Ambient temperature range
8 Reserved for additional information on device version (approvals, certificates)
9 Degree of protection
10 Nominal pressure: 350 bar
11 Additional information: with 5-point calibration
2.1.3 Additional nameplate for suitability for custody transfer
measurement
A0011591-en
Fig. 3: Nameplate specifications for suitability for custody transfer measurement (example)
1 Ambient classes
2Measuredquantities
3 Symbol for custody transfer consisting of the number and issue date
5P-CAL
-40°C (-40°F) < Tamb <+60°C (140°F)
ABCDEFGHJKLMNPQRST
8DF15-XXXXXXXXXXXX
DN 15 - G3/4”
-50°C ... +150°C / -58°F ... +302°F
1.4435 / 316L
IP67 / NEMA/Type4X
Materials:
TM:
12345678901
Order Code:
K-factor:
Ident No.:
Ser. No.:
1.0000 / -5
PROMASS FP (CNGmass DCI)
N12895
Switzerland
4153 Reinach
2009
pnom = 350bar / 5080psi (gauge)
i
1
2
3
4
5
7
9
11
6
10
8
CNGmass DCI DN15
B,C
Qmin = 0.8 kg/h
Qmax = 80 kg/h
09.XX
X.XXX
13
2
1.0 kg Minimum Measured Quantity:
Environment class:

CNGmass DCI MODBUS RS485 Identification
Endress+Hauser 9
2.1.4 Nameplate for connections
A0004362
Fig. 4: Nameplate specifications for transmitter connections (example)
1 Serial number
2 Possible configuration of current output
3 Possible configuration of relay contacts
4 Terminal assignment, cable for power supply: 85 to 260 V AC, 20 to 55 V AC, 16 to 62 V DC
– Terminal No. 1: L1 for AC, L+ for DC
– Terminal No. 2: N for AC, L- for DC
5 Signals present at inputs and outputs, possible configuration and terminal assignment (20 to 27),
Èalso "Electrical values of inputs/outputs"→ä84
6 Version of device software currently installed (incl. language group)
7 Installed communication type
8 Information on current communication software (Device Revision and Device Description)
9 Date of installation
10 Current updates to data specified in points 6 to 9
26(+) / 27(-)
NC:
Versorgung /
Tension d'alimentation
Observer manuel d'instruction
See operating manual
Betriebsanleitung beachten
Communication:
Drivers:
Device SW: XX.XX.XX
XXXXXXXXXXXXXXXX
XXXXXXXXXXXSer.No.:
Supply /
24(+) / 25(-)
22(+) / 23(-)
20(+) / 21(-)
N/L-
PE
A:
NO:
P:
L1/L+
12
319475-00XX
active
passive
normally open contact
normally closed contact
Date: 01. MAI 2009
Update 1
Ex works / ab Werk / réglages usine Update 2
(WEA)
26 = B (RxD/TxD-P)
27 = A (RxD/TxD-N)
3…30VDC, Ri = 3 kOhm
STATUS-IN
MODBUS RS485
X
X
max. 30VAC/0.5A
max. 60VDC/0.1A
max. 30VAC/0.5A
max. 60VDC/0.1A
RELAY
RELAY
NO
NC
2
3
10
6
7
8
9
5
4
1

Identification CNGmass DCI MODBUS RS485
10 Endress+Hauser
2.1.5 Additional sign – position of the rupture disk
A0006920
Fig. 5: Additional sign regarding the position of the rupture disk (RUPTURE DISK)
!Note!
Additional information on the burst pressure of the secondary containment →ä87.
2.2 Certificates and approvals
The devices are designed in accordance with good engineering practice to meet state-of-the-art
safety requirements, have been tested, and left the factory in a condition in which they are safe to
operate.
The measuring devices comply with the applicable standards and regulations in accordance with
EN 61010 -1, "Safety requirements for electrical equipment for measurement, control and
laboratory use" and with the EMC requirements of IEC/EN 61326.
The measuring system described in these Operating Instructions thus complies with the statutory
requirements of the EC Directives. Endress+Hauser confirms successful testing of the device by
affixing to it the CE mark.
The measuring system meets the EMC requirements of the Australian Communications and Media
Authority (ACMA).
The measuring device meets all the requirements of the MODBUS/TCP conformity and integration
test and holds the "MODBUS/TCP Conformance Test Policy, Version 2.0". The measuring device
has successfully passed all the test procedures carried out and is certified by the "MODBUS/TCP
Conformance Test Laboratory" of the University of Michigan.
2.3 Registered trademarks
MODBUS®
Registered trademark of the MODBUS Organization
HistoROM™, S-DAT®, T-DAT™, FieldCare®, Fieldcheck®, Applicator®
Registered or registration-pending trademarks of Endress+Hauser Flowtec AG, Reinach, CH
i
RUPTURE
DISK
FLOW DIRECTION

CNGmass DCI MODBUS RS485 Installation
Endress+Hauser 11
3 Installation
3.1 Incoming acceptance, transport and storage
3.1.1 Incoming acceptance
On receipt of the goods, check the following points:
• Is the packaging or content damaged?
• Is anything missing from the shipment and does the scope of supply match your order?
3.1.2 Transport
Comply with the following instructions when unpacking the device and transporting it to its final
location:
• Transport the devices in the containers in which they are delivered.
• The covers or caps fitted to the process connections prevent mechanical damage to the sealing
faces and the ingress of foreign matter to the measuring tube during transportation and storage.
Consequently, do not remove these covers or caps until immediately before installation.
3.1.3 Storage
Note the following points:
• Pack the measuring device in such a way as to protect it reliably against impact for storage (and
transportation). The original packaging provides optimum protection.
• The permitted storage temperature is –40 to +80 °C (–40 to 176 °F).
• Do not remove the protective caps on the process connections until you are ready to install the
device.
• The measuring device must be protected against direct sunlight during storage in order to avoid
unacceptably high surface temperatures.
3.2 Installation conditions
The measuring device is to be installed in a de-energized state free from outside loads or strain.
3.2.1 Dimensions
All the dimensions and lengths of the sensor and transmitter are provided in the separate
documentation entitled "Technical Information" →ä90.
3.2.2 Inlet and outlet runs
No special precautions need to be taken for fittings which create turbulence (valves, elbows,
T-pieces etc.).
3.2.3 Vibrations
The high oscillation frequency of the measuring tubes ensures that the correct operation of the
measuring system is not influenced by pipe vibrations. Consequently, the sensors require no special
measures for attachment.
3.2.4 Limiting flow
Limiting flow information can be found in the separate "Technical Information" document,
→ä90.

Installation CNGmass DCI MODBUS RS485
12 Endress+Hauser
3.3 Installation instructions
3.3.1 Turning the transmitter housing
Turning the aluminum field housing
#Warning!
The turning mechanism in devices with EEx d/de or NEC/CEC Cl. I Div. 1 classification is not the
same as that described here. The procedure for turning these housings is described in the Ex-specific
documentation.
1. Loosen the two securing screws.
2. Turn the bayonet catch as far as it will go.
3. Carefully lift the transmitter housing as far as it will go.
4. Turn the transmitter housing to the desired position (max. 2 × 90° in either direction).
5. Lower the housing into position and reengage the bayonet catch.
6. Retighten the two securing screws.
A0004302
Fig. 6: Turning the transmitter housing (aluminum field housing)
3
5
6
1
24

CNGmass DCI MODBUS RS485 Installation
Endress+Hauser 13
3.3.2 Installing the wall-mount housing
There are various ways of installing the wall-mount housing:
• Mounted directly on the wall
• Installation in control panel (separate mounting set, accessories) →ä14
• Pipe mounting (separate mounting set, accessories) →ä14
"Caution!
• At the mounting location, ensure that the permitted ambient temperature range
(–20 to +60 °C (–4 to +140 °F), optional –40 to +60 °C (–40 to +140 °F)) is not exceeded. Install
the device in a shady location. Avoid direct sunlight.
• Always install the wall-mount housing in such a way that the cable entries are pointing down.
Mounted directly on the wall
1. Drill the holes →å7.
2. Remove the cover of the connection compartment (a).
3. Push the two securing screws (b) through the appropriate bores (c) in the housing.
– Securing screws (M6): max. Ø 6.5 mm (0.26")
– Screw head: max. Ø 10.5 mm (0.41")
4. Secure the transmitter housing to the wall as indicated.
5. Screw the cover of the connection compartment (a) firmly onto the housing.
A0001130
Fig. 7: Mounted directly on the wall
a
bcc
90 (3.54)
35 (1.38)
192 (7.56)
81.5 (3.2)
mm (inch)

Installation CNGmass DCI MODBUS RS485
14 Endress+Hauser
Installation in control panel
1. Prepare the opening in the panel →å8.
2. Slide the housing into the opening in the panel from the front.
3. Screw the fasteners onto the wall-mount housing.
4. Screw the threaded rods into the holders and tighten them until the housing is secured on the
panel wall. Afterwards, tighten the locking nuts.
Additional support is not necessary.
A0001131
Fig. 8: Panel installation (wall-mount housing)
Pipe mounting
The assembly should be performed by following the instructions in →å9.
"Caution!
If a warm pipe is used for installation, ensure that the housing temperature does not exceed the
permitted value of +60 °C (+140 °F).
A0001132
Fig. 9: Pipe mounting (wall-mount housing)
245 (9.65)
~110 (~4.33)
210 (8.27) +0.5 (+0.019)
–0.5 (–0.019)
+0.5 (+0.019)
–0.5 (–0.019)
mm (inch)
Ø 20…70
(Ø 0.79…2.75)
~ ~ 6.1)155 (
mm (inch)

CNGmass DCI MODBUS RS485 Installation
Endress+Hauser 15
3.3.3 Turning the local display
1. Unscrew cover of the electronics compartment from the transmitter housing.
2. Press the side latches on the display module and remove the module from the electronics
compartment cover plate.
3. Rotate the display to the desired position (max. 4 × 45 ° in both directions), and reset it onto
the electronics compartment cover plate.
4. Screw the cover of the electronics compartment firmly back onto the transmitter housing.
A0003236
Fig. 10: Turning the local display (field housing)
3.4 Post-installation check
Perform the following checks after installing the measuring device in the pipe:
4 x 45°
Device condition and specifications Notes
Is the device damaged (visual inspection)? –
Does the device correspond to specifications at the measuring point, including
process temperature and pressure, ambient temperature, measuring range etc.?
→ä8
Installation Notes
Does the arrow on the sensor nameplate match the direction of flow through the
pipe?
–
Are the measuring point number and labeling correct (visual inspection)? –
Is the orientation chosen for the sensor correct, in other words suitable for sensor
type, fluid properties (outgassing, with entrained solids) and fluid temperature?
→ä11
Process environment / process conditions Notes
Is the measuring device protected against moisture and direct sunlight? –

Wiring CNGmass DCI MODBUS RS485
16 Endress+Hauser
4 Wiring
#Warning!
When connecting Ex-certified devices, see the notes and diagrams in the Ex-specific supplement to
these Operating Instructions. Please do not hesitate to contact your Endress+Hauser sales office if
you have any questions.
!Note!
The measuring device does not have an internal disconnecting device. Therefore, assign a switch or
circuit breaker to the measuring device with which the voltage supply line can be disconnected from
the power system.
4.1 MODBUS RS485 cable specifications
In the EIA/TIA-485 standard, two versions (cable type A and B) are specified for the bus line and
can be used for all transmission rates. However, we recommend you use cable type A. The cable
specification for cable type A is provided in the following table:
Note the following points for the bus structure:
• All the measuring devices are connected in a bus structure (line).
• Using cable type A and with a transmission rate of 115200 Baud, the maximum line length
(segment length) of the MODBUS RS485 system is 1200 m (3936 ft). The total length of the spurs
may not exceed a maximum of 6.6 m (21.7 ft) here.
• A maximum of 32 users are permitted per segment.
• Each segment is terminated at either end with a terminating resistor.
• The bus length or the number of users can be increased by introducing a repeater.
Cable type A
Characteristic impedance 135 to 165 Ωat a measuring frequency of 3 to 20 MHz
Cable capacitance < 30 pF/m (< 9.2 pF/ft)
Core cross-section > 0.34 mm2(AWG 22)
Cable type Twisted pairs
Loop-resistance ≤ 110 Ω/km (≤ 0.034 Ω/ft)
Signal damping Max. 9 dB over the entire length of the cable cross-section
Shielding Copper braided shielding or braided shielding and foil shielding

CNGmass DCI MODBUS RS485 Wiring
Endress+Hauser 17
4.1.1 Shielding and grounding
When planning the shielding and grounding for a fieldbus system, there are three important points
to consider:
• Electromagnetic compatibility (EMC)
• Explosion protection
• Employee safety
To ensure the optimum electromagnetic compatibility of systems, it is important that the system
components and above all the cables, which connect the components, are shielded and that no
portion of the system is unshielded. Ideally, the cable shields are connected to the normally metal
housings of the connected field devices. Since these are generally connected to the protective
ground, the shield of the bus cable is grounded many times. Make sure that the stripped and twisted
lengths of cable shield to the terminals are as short as possible.
This approach, which provides the best electromagnetic compatibility and employee safety, can be
used without restriction in systems with optimum potential equalization.
In the case of systems without potential equalization, a mains frequency (50 Hz) equalizing current
can flow between two grounding points which can destroy the cable in unfavorable cases, e.g. when
it exceeds the permissible shield current.
To suppress the low frequency equalizing currents on systems without potential equalization, it is
therefore recommended to connect the cable shield directly to the building ground (or protective
ground) at one end only and to use capacitive coupling to connect all other grounding points.
"Caution!
The legal EMC requirements are fulfilled only when the cable shield is grounded on both sides!

Wiring CNGmass DCI MODBUS RS485
18 Endress+Hauser
4.2 Connecting the remote version
4.2.1 Connecting cable for sensor/transmitter
#Warning!
• Risk of electric shock. Switch off the power supply before opening the device.
Do not install or wire the device while it is connected to the power supply.
Failure to comply with this precaution can result in irreparable damage to the electronics.
• Risk of electric shock. Connect the protective ground to the ground terminal on the housing
before the power supply is applied.
• You may only connect the sensor to the transmitter with the same serial number. Communication
errors can occur if this is not observed when connecting the devices.
1. Remove the cover (d) from the connection compartment or sensor housing.
2. Feed the connecting cable (e) through the appropriate cable runs.
3. Establish the wiring between the sensor and transmitter in accordance with the wiring diagram
(→å11 or wiring layout in the screw cap).
4. Seal the connection compartment or the transmitter housing again.
A0003681
Fig. 11: Connecting the remote version
a Transmitter wall-mount housing: non-hazardous area
b Transmitter wall-mount housing: ATEX II2G / Zone 1 / NEC/CEC →separate Ex documentation
c Sensor connection housing
d Cover of connection compartment or connection housing
e Connecting cable
Terminal No.: 4/5 = gray; 6/7 = green; 8 = yellow; 9/10 = pink; 11/12 = white; 41/42 = brown
4.2.2 Cable specification, connecting cable
The specifications of the cable connecting the transmitter and the sensor of the remote version are
as follows:
• 6 × 0.38 mm2(20 AWG) PVC cable with common shield and individually shielded cores
• Conductor resistance: ≤50 Ω/km (≤0.015 Ω/ft)
• Capacitance core/shield: ≤140 pF/m (≤42.7 pF/ft)
• Cable length: max. 20 m (65.6 ft)
• Permanent operating temperature: max. +105 °C (+221 °F)
!Note!
The cable must be installed securely, to prevent movement.
4 5 6 7 8 9 10 11 12 41 42
4 5 6 7 8 9 10 11 12 41 42
S1 S1 S2 S2 GND TM TM TT TT
++ ++
++ ++
S1 S1 S2 S2 GND TM TM TT TT
ab
c
dd
d
e

CNGmass DCI MODBUS RS485 Wiring
Endress+Hauser 19
4.3 Connecting the measuring unit
4.3.1 Transmitter connection
#Warning!
• Risk of electric shock. Switch off the power supply before opening the device.
Do not install or wire the device while it is connected to the power supply.
Failure to comply with this precaution can result in irreparable damage to the electronics.
• Risk of electric shock. Connect the protective ground to the ground terminal on the housing
before the power supply is applied unless special protection measures have been taken (e. g.
galvanically isolated power supply SELV or PELV).
• Compare the specifications on the nameplate with the local supply voltage and frequency.
The national regulations governing the installation of electrical equipment also apply.
1. Remove the cover of the connection compartment (a) from the transmitter housing.
2. Feed the power supply cable (b), signal cable (g) and fieldbus cable (d) through the appropriate
cable entries.
3. Perform wiring in accordance with the respective terminal assignment and the associated
wiring diagram.
"Caution!
– Risk of damaging the fieldbus cable!
Observe the information about shielding and grounding the fieldbus cable (→ä17).
– We recommend that the fieldbus cable not be looped using conventional cable glands. If
even just one measuring device is subsequently replaced, the bus communication will have
to be interrupted.
4. Screw the cover of the connection compartment (a) firmly onto the transmitter housing.

Wiring CNGmass DCI MODBUS RS485
20 Endress+Hauser
A0002591
Fig. 12: Connecting the transmitter, cable cross-section: max. 2.5 mm2(14 AWG)
A View A (field housing)
C View C (wall-mount housing)
a Connection compartment cover
b Cable for power supply: 85 to 260 V AC, 20 to 55 V AC, 16 to 62 V DC
– Terminal No. 1: L1 for AC, L+ for DC
– Terminal No. 2: N for AC, L- for DC
c Ground terminal for protective ground
d Fieldbus cable
– Terminal No. 26: B (RxD/TxD-P)
– Terminal No. 27: A (RxD/TxD-N)
Ground terminal for signal cable shield/fieldbus cable shield Observe the following:
– the shielding and grounding of the fieldbus cable →ä17
– that the stripped and twisted lengths of cable shield to the ground terminal are as short as possible
f Service adapter for connecting service interface 193 (Fieldcheck, FieldCare)
g Signal cable: terminal assignment →ä21
a
A
C
25
23
21
2
1
24
22
20
L1 (L+)
N (L-)
–
–
–
+
+
+
27
26 d
c
e
b
g
A (RxD/TxD-N)
B (RxD/TxD-P)
12
c
f
bd
222320 21 242526 27
g
+–+– +–
L1
N
(L+)
(L–)
e
f
a
d
bg
d
g
b
A (RxD/TxD-N)
B (RxD/TxD-P)