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Technical Information

CNGmass

Coriolis Mass Flow Measuring SystemFor fueling with Compressed Natural Gas (CNG)

ApplicationsThe Coriolis measuring principle works independently of the physical fluid properties.

Specially designed flowmeter for fueling vehicles withCNG (compressed natural gas)

Fluid temperature up to +125 C Process pressures up to 350 bar Mass flow measurement up to 150 kg/min

Approvals for hazardous area: ATEX, FM, CSA

Connection to common control systems: MODBUS RS485

Your benefitsThe Promass measuring devices allow you recordmultiple process variables (mass/density/temperature)simultaneously during operation for diverse processconditions.

The transmitter concept comprises: ToF-Tool/FieldTool Package for onsite operation and

diagnosis Very low energy consumption

The Promass sensors , tried and tested in over 100,000applications, offer: Space-saving and compact design Insensitivity to vibrations thanks to balanced twin-

tube measuring system Easy installation without taking inlet or outlet runs

into account

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Table of contents

Function and system design. . . . . . . . . . . . . . . . . . . . . 3Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Measuring ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Operable flow range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Electrical connection, measuring unit . . . . . . . . . . . . . . . . . . . . . . 5Electrical connection, terminal assignment . . . . . . . . . . . . . . . . . . 5Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Cable entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Cable specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Power supply failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Potential equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Performance characteristics. . . . . . . . . . . . . . . . . . . . . 6Reference operating conditions for factory calibration . . . . . . . . . 6Maximum measured error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Influence of medium temperature . . . . . . . . . . . . . . . . . . . . . . . . . 7Influence of medium pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operating conditions: Installation . . . . . . . . . . . . . . . . 7Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Inlet and outlet runs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operating conditions: Environment. . . . . . . . . . . . . . . 8 Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Shock resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . 8

Operating conditions: Process . . . . . . . . . . . . . . . . . . . 9Medium temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Medium pressure range (nominal pressure) . . . . . . . . . . . . . . . . . 9Rupture disk in the sensor housing . . . . . . . . . . . . . . . . . . . . . . . . 9Limiting flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Custody transfer measurement . . . . . . . . . . . . . . . . . 10Custody transfer variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Suitability for custody transfer measurement, approval by theStandards Authorities, repeated calibration due to legal metrology controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Approval for custody transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Verification process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Setting up custody transfer mode . . . . . . . . . . . . . . . . . . . . . . . . 10Disabling custody transfer mode . . . . . . . . . . . . . . . . . . . . . . . . . 10

Mechanical construction . . . . . . . . . . . . . . . . . . . . . . 11Design / dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Material load diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Process connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Remote operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Certificates and approvals . . . . . . . . . . . . . . . . . . . . . 14CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14C-tick mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14MODBUS certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Pressure device approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Other standards and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . 14

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . . 15

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Function and system design

Measuring principle The measuring principle is based on the controlled generation of Coriolis forces. These forces always occur ina system where translational (linear) and rotational movements are superimposed simultaneously.

FC = 2 m (v )

FC = Coriolis force m = moving mass = rotational velocity

v = radial velocity in rotating or oscillating system

The size of the Coriolis force depends on the moving mass m, its velocity v in the system, and thus the massflow. Instead of a constant rotational velocity , Promass uses oscillation.

In the sensor, two parallel measuring tubes containing flowing fluid oscillate in antiphase, acting like a tuning fork. The Coriolis forces produced at the measuring tubes cause a phase shift in the tube oscillations (seeillustration): At zero flow, in other words when the fluid is at a standstill, the two tubes oscillate in phase (1). Mass flow causes deceleration of the tube oscillation at the inlet (2) and acceleration at the outlet (3).

A0006995

The phase difference (A-B) increases with increasing mass flow. Electrodynamic sensors register the tubeoscillations at the inlet and outlet. System balance is ensured by the antiphase oscillation of the two measuring tubes. The measuring principle works independently of temperature, pressure, viscosity, conductivity and flow profile.

Density measurement The measuring tubes are always excited at their resonance frequency. A change in the mass and thus thedensity of the oscillating system (comprising measuring tubes and fluid) results in a corresponding, automaticadjustment in the exciter frequency. Resonance frequency is thus a function of fluid density. Themicroprocessor utilizes this relationship to obtain a density signal.

Temperature measurement

To make calculations to compensate for temperature effects, the temperature of the measuring tubes ismeasured. This signal corresponds to the process temperature and is also available as an output signal.

1

A

B

2

A

B

3

A

B

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Measuring system The measuring system consists of the transmitter and sensor which together form a mechanical unit.

Measuring system

Input

Measured variable Mass flow (proportional to the phase difference between two sensors mounted on the measuring tube whichrecord differences in the pipe oscillation geometry during flow)

Volume flow (measured from the mass flow and density) Fluid density (proportional to the resonance frequency of the measuring tube) Fluid temperature (measured with temperature sensors)

Measuring ranges Measuring ranges for Compressed Natural Gas (CNG), non-custody transfer operation.

! Note!The values of the corresponding custody transfer certificate apply for custody transfer operation.

Operable flow range 1:100

Output

Output signal Pulse / frequency output:

Passive Galvanically isolated Open Collector Max. 30 V DC Max. 250 mA Frequency output: end frequency 100 to 5000 Hz, on/off ratio 1:1 Pulse output: pulse value and pulse polarity selectable, pulse width configurable (0.1 to 1000 ms)

Status output:

Passive Open Collector Max. 30 V DC Max. 250 mA

CNGmass

A0006979

Without onsite operation Configuration via MODBUS RS485 and "ToF Tool - FieldTool Package"

Limiting medium pressure range max. 350 bar Ambient temperature range: 40 to +60 C

DN m min to m max

15 80 kg/min

25 150 kg/min

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MODBUS interface:

MODBUS device type: slave Address range: 1 to 247 Functions codes supported: 03, 04, 06, 08, 16, 23 Broadcast: supported with the function codes 06, 16, 23 Physical interface: RS485 in accordance with standard EIA/TIA-485 Baud rates supported: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 Baud Transmission mode: RTU or ASCII Response time = typically 5 ms

Signal on alarm Pulse / frequency output: Failsafe mode can be selected

Status output: Assignment can be selected

MODBUS RS485: Failsafe mode can be selected

Galvanic isolation All circuits for outputs and power supply are galvanically isolated from each other.

Power supply

Electrical connection,measuring unit

A0006923

Connecting the transmitter, cable cross-section: max. 2.5 mm 2

A View A a Safety claw b Terminal compartment cover c Signal cable: terminal Nos. 22-27

(shield for Modbus RS485 is mandatory; shield for pulse, frequency and status outputs is not required, but recommended)

d Cable for power supply: 20 to 28 V AC, 10 to 30 V DC Terminal No. 1: L1 for AC, L+ for DC Terminal No. 2: N for AC, L- for DC

Electrical connection,terminal assignment

CNGmass

a

b

cd

A

A

27 26 25 24 23 22 2 1

c d

- + - + - + N(L-)

L1(L+)

Terminal No. (inputs/outputs)

Order version 22 (+) / 23 () 24 (+) / 25 () 26 (+) / 27 ()

8FF**-***********N Pulse/frequency/statusoutput 2

Pulse/frequency/statusoutput 1

MODBUS RS485

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Influence of mediumtemperature

When there is a difference between the temperature for zero point adjustment and the process temperature,the typical measured error is 0.0003% of the full scale value/C.

Influence of medium pressure The following section shows the effect on accuracy of mass flow due to a difference between calibrationpressure and process pressure is negligible.

Operating conditions: Installation

Installation instructions Note the following points: No special measures such as supports are necessary. The housing absorbs external forces. The high oscillation frequency of the measuring tubes ensures that the correct operation of the measuring

system is not influenced by pipe vibrations. No special precautions need to be taken for fittings which create turbulence (valves, elbows, T-pieces, etc.).

Turning the transmitter housing

The transmitter housing can be rotated counterclockwise continuously up to 360.

A0006921

1 = Allen screw

1

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Zero point adjustment

All measuring devices are calibrated with state-of-the-art technology. The zero point obtained in this way isprinted on the nameplate. Calibration takes place under reference operating conditions ( Page 6). Therefore,a zero point adjustment is generally not required!

If you want to carry out a zero point adjustment, note the following points before doing so:

The calibration can be carried out under stable pressure conditions only. The zero point adjustment is carried out a zero flow. This can be achieved, for example, with shutoff valvesupstream and/or downstream of the sensor or by using existing valves and gates. Normal operation Valves 1 and 2 open Zero point adjustment with process pressure * Valve 1 open / valve 2 closed Zero point adjustment without process pressure * Valve 1 open / valve 2 closed

A zero point adjustment is not possible if the SECURITY function is enabled or if an error message is pending.

A0006928

Zero point adjustment and shut-off valves

Inlet and outlet runs There are no installation requirements regarding inlet and outlet runs.

Operating conditions: Environment

Ambient temperature range 40 to +60 C (sensor, transmitter)

! Note!Install the device at a shady location. Avoid direct sunlight, particularly in warm climatic regions.

Storage temperature 40 to +80 C (preferably +20 C)

Degree of protection Standard: IP 67 (NEMA 4X) for transmitter and sensor

Shock resistance In accordance with IEC 68-2-31 and EN 60721 (Class 2M3)

Vibration resistance In accordance with IEC 68-2-31 and EN 60721 (Class 2M3)

Electromagnetic compatibility (EMC)

As per EN 61326 (IEC 1326)

1

2

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Operating conditions: Process

Medium temperature range 50 to +125 C

Medium pressure range(nominal pressure) Measuring tubes, connector: max. 350 bar

Rupture disk in the sensorhousing

Triggering pressure in the housing 10 to 15 bar

The position of the rupture disk is indicated by an adhesive label on top of the disk. If the rupture disk istriggered, the adhesive label is damaged and can thus be visually monitored.

A0006920

Additional sign regarding the position of the rupture disk (RUPTURE DISK)

Limiting flow See information in the "Measuring range" Section Page 4

i

RUPTUREDISK

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Custody transfer measurement CNGmass is a flowmeter for Compressed Natural Gas (CNG) that is suitable for custody transfer measurement.

Custody transfer variables Mass flow

Suitability for custody transfermeasurement, approval by theStandards Authorities,repeated calibration due tolegal metrology controls

All flowmeters are typically verified on site using reference measurements. Only once it has been approved by the authority for legal metrology controls may the measuring device be regarded as verified and used forapplications subject to legal metrology controls. The associated seal on the measuring device ensures this status.

Approval for custody transfer The following guidelines for the custody transfer process were developed in accordance with the following authorities for legal metrology controls:

Verification process The verification process is regulated by national rules or regulations.

Setting up custody transfermode

The flowmeter must be locked for custody transfer measurement. For this purpose, the switches (c + d) aremoved to the position shown below (1). You receive confirmation from the status LED ( Page 12). Then, fit the cover and have the safety claw sealed by a person authorized to do so (2).

A0006929

Switch locked

Disabling custody transfermode

The flowmeter can be reset to exit custody transfer mode.To do so, destroy and remove the seal on the safety claw (1). This process may be carried out by authorizedpersonnel only. Open the cover. Return switches (c + d) to the position shown below (2). You receive

confirmation from the status LED ( Page 12).

A0006930

Switch unlocked

PTB Germany METAS Switzerland NTEP USA

NMi Netherlands BEV Austria MC Canada

a b c d

2

1

a b c d

1

2

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Mechanical construction

Design / dimensions Dimensions (non-hazardous area and II2G / Zone 1)

A0006968

Weight DN 15 = 8.3 kg DN 25 = 9.3 kg

Material Transmitter housing:

Powder coated die-cast aluminum

Housing of sensor/secondary containment:

Acid-resistant and alkali-resistant external surface, stainless steel 1.4301/304

Process connections

Stainless steel 1.4404/316

Measuring tubes:

Stainless steel 1.4435/316L

Dimensions in metric units

DN A B C D E F G H I K di

15 308 208 100 160 92 193 267 41 139 G" 6.23

25 313 208 105 160 92 244 316 46 139 G1" 8.8

A

B

C

D

E

F

G

H

I

di

K

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Material load diagram CNGmass process connections

Connection material: 1.4404/316

A0006993-EN

Process connections Cylindrical internal thread BSP (G) in accordance with ISO 228-I with sealing surfaces in accordance withDIN 3852-2/ISO 1179-1:

G " for DN 15 G 1" for DN 25

! Note!Sealed with profile seal in accordance with DIN 3869 or copper disk or steel seal disk with plastic lip.

Human interfaceDisplay elements Status LED

There is a Light Emitting Diode (LED) on the meter electronics board that allows simple fault diagnostics:

If the status output was not configured to output errors or notes. If fault diagnostics are no longer possible via the Fieldtool operating program.

# Warning!Risk of explosion! The electronics compartment may not be opened while there is an explosive atmosphere.This type of fault diagnostics can no longer be carried out in Ex-protected areas.

A0006980

Fault diagnostics using light emitting diode (a)

[bar]

0

50

100

150

200

250

300

350

[C] 20 0 20 40 60 80 100 125 50

a

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Remote operation You have the following option for configuring and commissioning the device:

A0006926

1 = Configuration/operating program for operating via the service interface FXA2912 = Operation via Modbus RS485 process control system 3 = Situation sticker for the various DIP switch positions and their functions 4 = Operation via device-internal DIP switch ( a )

If the DIP switch (a) is switched upwards, the device restores the factory settings of the communication parameters of the Modbus RS485.

5 = Operation via device-internal DIP switch ( b ): If the DIP switch (b) is switched upwards, the device restores the factory settings of all the parameters.

! Note!Resetting the parameters can take several minutes. The device is then restarted.The power supply should not be switched off when restoring the factory settings.

Status of light emitting diode (LED) Status of measuring system

LED illuminated in green Measuring system OK, creepage is active

LED flashes green (once per second) Measuring system OK, operation

LED not illuminated Measuring system no longer working

LED flashes red (three times p er second) Operation not possible Error (fault message) pending

LED flashes red/green (once per second) Operation possible, but may be limited by applicationconditions.

Notice message pending

LED flashes red/green (three t imes per second) Zero point adjus tment running

LED flashes green/orange (approx. 3 seconds long) Custody transfer mode started

LED flashes red/orange (approx. 3 seconds long) Custody transfer mode exited

LED flashes red/(pause)/green (approx. 3 seconds long) SW update active

1 2

a b c da b c d

Modbus RS485

FXA291

3

4 5

Service ConnectorStatus LED

= Security ON

= Security OFF

= Fact. Sett.All Parameter

= Fact. Sett. Com. Para.

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Certificates and approvals

CE mark The measuring system is in conformity with the statutory requirements of the EC Directives.Endress+Hauser confirms successful testing of the device by affixing to it the CE mark.

C-tick mark The measuring system meets the EMC requirements of the Australian Communications Authority (ACA).

Ex approval Information about currently available Ex versions (ATEX, FM, CSA) can be supplied by your E+H Sales Centeron request. All explosion protection data are given in a separate Ex documentation, which is available uponrequest.

MODBUS certification The measuring device meets all the requirements of the MODBUS/TCP conformity and integration test andhas the "MODBUS/TCP Conformance Test Policy, Version 2.0". The measuring device has successfully passedall the test procedures carried out and is certified by the "MODBUS/TCP Conformance Test Laboratory" of theUniversity of Michigan.

Pressure device approval Measuring devices with a nominal diameter smaller than or equal to DN 25 correspond to Article 3(3)of the EC Directive 97/23/EC (Pressure Equipment Directive) and have been designed and manufactured

according to good engineering practice.

Other standards andguidelines

EN 60529Degrees of protection by housing (IP code)

EN 61010-1Safety requirements for electrical equipment formeasurement, control and laboratory use

EN 61326/A1 (IEC 1326)"Emission in accordance with Class A requirements".Electromagnetic compatibility (EMC requirements)

EN 60721 OIML R117 shock and vibration resistance

OIML R117 suitability for custody transfer measurement

Ordering informationThe Endress +Hauser service organization can provide detailed ordering information and information on theorder code.

Accessories

Various accessories, which can be ordered separately from Endress +Hauser, are available for the transmitterand the sensor.

! Note!Detailed information on the order codes in question can be obtained from your Endress +Hauser serviceorganization.

Documentation Flow measuring technology (FA005D/06/en)

Operating Instructions incl. instrument functions CNGmass (BA123D/06/en)

Ex-Supplementary documentation: ATEX (XA115D/06/a3) Ex-Supplementary documentation: FM/CSA (XA116D/06/en)

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Registered trademarksHART Registered trademark of the HART Communication Foundation, Austin, USA

MODBUS

Registered trademark of the MODBUS Organization

HistoROM, S-DAT, T-DAT, F-CHIP , ToF Tool - Fieldtool Package, Fieldcheck , Applicator

Registered or registration-pending trademarks of Endress+Hauser Flowtec AG, Reinach, CH

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Instruments International

Endress+HauserInstruments International AGKaegenstrasse 24153 ReinachSwitzerland

Tel. +41 61 715 81 00Fax +41 61 715 25 00

www.endress.cominfo@ii.endress.com

TI077D/06/en/12.0671036552FM+SGML6 0 ProMoDo