Corus® SCGas volume converter with encoder interface

Corus SC is an electronic volume converter with integrated database dedicated to commercial and industrial applications. It converts the actual volume measured by the gas meter to reference conditions. Corus SC can be connected to a gas meter via a Namur interface either with encoder technology or high-frequency (HF) pulse input. Associated with Cyble SC, it provides a reliable serial index transmission for all commercial and industrial Itron gas meters.

KEY BENEFITS

» Encoder input (compatible with Cyble SC)

» Large integrated database PTB 50.7 approved

» Up to 3 communication ports for local and remote communication

» Communication drivers implemented in most popular Data Collection systems

DESCRIPTION

The volume registered by the meter is converted to reference conditions using the formula :

Vb =Pm Tb Zb

VmPb Tm Zm

Terminology

» Vm unconverted volume registered by the meter

» Vb converted volume in reference (base) conditions

» Tm gas temperature in operating conditions

» Tb reference (base) temperature

» Pm gas pressure in operating conditions

» Pb reference (base) pressure

» Zm compressibility factor in operating conditions

» Zb compressibility factor in reference (base) conditions

DATABASE AND LOGBOOK

The Corus SC has ample memory space for data storage. At every 5-min the measured and converted values are stored in an internal database. The memory of the Corus SC can store these 5-min values over a period of 150 days. All database records can be displayed on the LCD. It can be decided whether 5, 10, 15, 30 or 60-min values are to be shown. Additional information of the Corus SC is stored into status log or metrological log with a capacity of 360 records each. Database is approved by PTB according to PTB 50.7 specifications.

SPECIFICATIONS

ERROR CURVE CORRECTION

All gas meters show minor inaccuracy, referred to as measuring error as shown on the error curve diagram.

Error curve correction is possible on Corus SC if the HF input is used as the volume input.

Corus SC can save 10 points of the gas meter error curve. On this basis Corus SC will then apply linear interpolation to correct the volume measured by the gas meter. This error correction complies with standards EN12405-1 +A2. Using this functionality will considerably increase the accuracy of the operating volume measurement.

INPUTS

Corus SC has a Namur input and three low-frequency (LF) pulse inputs. Only Namur input and LF pulse input 1 can be used for conversion. Pulse input 2 can be used to verify the pulses received on input 1 and pulse input 3 is available for a second gas meter (without conversion).

The Namur input can be connected to a gas meter equipped with encoder technology like Cyble SC which ensures that the Corus SC index is always synchronous with the gas meter index.

The pressure sensor can either be internal or external with a cable of 3 m length.

The following pressure ranges are available:

» 0.8 - 2.5 bar abs.

» 1.5 - 6.0 bar abs (available also as 0.9 - 6.0 bar).

» 2.5 - 10 bar abs.

» 5.0 - 20 bar abs.

The temperature sensor is a platinum Pt500 with a 3-metre cable length.

HUMAN MACHINE INTERFACE

Corus SC is provided with a large graphical display and four navigation keys allowing information to be easily and logically displayed.

POWER SUPPLY

Corus SC is provided with a DD cell for extra-long battery life time (AD cell is used for T/TZ version). When using a Cyble SC or another encoder, Corus SC can operate for 5 years with the DD cell, without the need of any external power supply (reading of encoder every 25 sec).

If an ISC 230 external power supply unit is used, it is still allowed to install Corus SC in an explosion hazardous zone.

If the high-frequency pulse input is used, Corus SC must be supplied by one of the mains supply units. In the event of mains supply breakdown, the battery acts as an emergency supply provision.

INTERFACE & INPUTS

1 Three LF pulse input indicators

2 Two LF pulse output indicators

3 Two alarm output indicators

4 Battery status indicator

5 Pressure sensor

6 Temperature sensor

7 NAMUR input (HF/encoder) and LF pulse input 1

8 LF pulse inputs 2 + 3

9 Alarm inputs 1 + 2

10 External power supply

11 Alarm outputs 1 + 2

12 Pulse outputs 1+2

13 Navigation keys

14 Communication port 1 for remote communication

15 Communication port 2 for communication with process computer

16 Communication port 3 for reading and configuring on location

4

5

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13

1416

15

321

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-1

0

1

2

Measuring error

Mea

surin

g er

ror [

%]

Flow [% Qmax]100 20 40 60 80 100

Curve on the basis of which Corus SC will correct the measuring error

COMMUNICATION

Corus SC in its standard configuration is provided with three communication ports:

» Communication port 1: remote communication;

» Communication port 2: communication to a process computer (or remote communication);

» Communication port 3: reading and configuration on location.

For remote reading and configuration of Corus SC via communication port 1, one of the following products can be connected by means of an infrared connector:

» UNILOG 300 (GSM/GPRS modem); - Sparkline (GSM/GPRS modem) for non-hazardous areas

» ISC 230 (intrinsically safe power supply and communication unit).

UNILOG 300 is available in versions for battery supply as well as for mains power supply.

Major functions of UNITOOL:

» reading and modifying the Corus SC configuration;

» reading indexes, measured values and status information;

» presentation of counter readings and measured values;

» storage of measured values in CSV, Görlitz and XML formats (information of other formats on request);

» communication through RS-232, RS-485, GSM and GPRS connection;

» automatic identification of the energy meter to which UNITOOL is connected;

» identification of user and right of use.

All functions can be used both locally and remotely.

UNILOG 300 with mains supply can also supply Corus SC with power.

The intrinsically safe power supply and local communication unit ISC 230 can also be used for supplying power to Corus SC.

For reading or configuring Corus SC on location, an infrared communication head is used that is connected to communication port 3.

A process computer is connected to communication port 2 by means of an infrared connector. An optional Modbus interface enables the communication with Modbus RTU or ASCII protocol.

CONFIGURATION SOFTWARE

UNITOOL is a universal software with which Corus SC can be read and configured. The user-friendly interface makes the use of UNITOOL extremely simple. For the management of meter data the Windows®-compatible software uses a universal SQL database.

CORUS SC DATA COLLECTIONSYSTEM

SPARKLINE

CORUS SC ISC 230

UNILOG 300

PROCESS COMPUTER

DATA COLLECTIONSYSTEM

ISC 230 » Ex-barrier serial outputs

» Ex-barrier pulse outputs

» Ex-safe electric power supply for Corus SC

» Signal Converter RS-232 < > RS-485 (optional)

UNILOG 300 » Modem (GSM/GPRS)

Additional functions for 230V AC power-supplied version:

» Ex-barrier serial outputs

» Ex-barrier pulse outputs

» Signal Converter RS-232 < > RS-485 (optional)

» Ex-safe electric power supply for Corus SC

DATA COLLECTION IN HAZARDOUS AREAS

DATA COLLECTION IN SAFE AREAS

SPARKLINE » Modem (GSM/GPRS)

» Voltage range: 85 to 264 VAC

» Temperature range: -20°C to +55°C

» Error code and field strength display

DIMENSIONS (in mm)

MOUNTING OPTION

Corus SC can be supplied from the factory already mounted on our Fluxi 2000/TZ turbine meter or Delta rotary meter equipped with Itron Cyble SC module.

Corus SC

194

120.

570

.3

Corus SC

194

120.

570

.3

Technical SpecificationsCharacteristics

HousingHousing: Coated aluminium 194x120x70mmIP rating: IP65

Human machine interface

Display: Large LCD 66x22mm, 8 lines x 20 charactersKeypad: 4 keys

Approvals

MID approved by NMI, T10132, compliant with EN12405-1 +A2, class E2/M2PTB 50.7 approved database, 7.732 / 11.46ATEX approved, 08ATEX0015X, rated II 1G Ex ia IIC T4 Ga (zone 0), or II (1)G [Ex ia Ga] IIC (safe area)

Compressibility calculation

S-GERG, AGA8 GM1, AGANX-19 modified (Gasunie), fixed Z

Inputs

1. Converter input LF (2Hz max) or HF (5KHz max) or Encoder (Namur interface encoders Cyble SC)2. LF (2Hz max) or Encoder (when input 1 is configured for LF) with comparison function to input 1

Pulse ouptputs2 Alarm outputs, freely programmable, galvanically isolated2 Volume outputs, freely programmable, galvanically isolated

Standard pressure ranges

0.8 - 2.5 bar abs., 0.9 - 6.0 bar abs. (or 1.5 - 6.0 bar abs.), 2.5 - 10 bar abs., 5 - 20 bar abs

TemperatureTemperature sensor: 2 wire Pt500Gas temperature range: -40°C to +55°CAmbiant temperature range: -40°C to +55°C

Memory capacity

Interval log: Every 5mn (fixed) over 150 daysDaily log: 100 daysMonthly log: 36 monthsStatus log: 360 recordsMetrological log: 360 records

Power supply

Battery powered with Lithium DD cell (35Ah), or D cell (19Ah) (T/TZ version)Lifetime at standard conditions without encoder 15 yearsExternal power supply connection 6-10V DC compatible for use in hazardous area with External module ISC 230

Communication protocols

IEC 62056-21 (former IEC 61107), Idom, Modbus (with adapter, for process control)

Communication ports

Com 1 : Serial infrared, screwed connection, sealable, for remote readingCom 2: Serial infrared, screwed connection, sealable, for process controlCom 3: Serial infrared, magnetic connection, for local configuration

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