Corus Gas Volume Converter

Product Description

We are one of the best dealer and domestic Supplier of ACD G10 – G16 Diaphragm Meter. We are the authorized dealer of Itron.

 

Applications        

 

Corus is an electronic volume converter dedicated to commercial and industrial applications. It Converts the actual volume measured by the gas meter to reference conditions. Thus, CORUS is a key element in the whole Itron chain, from the meter to billing data. CORUS uses the measured working values of volume, pressure and temperature to provide:

> The converted volume

> The conversion factor

> The compressibility factor (several formulas available)

> A large database

> Pulse retransmission

 

Description

 

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

Vb= Pm/pb Tb/Tm Zb/Zm Vm

 

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) condtions

 

CORUS is built in an IP65 enclosure, for wall or meter mounting. Thanks to its accurate piezo-resistive pressure sensor and its 4 wires PT1000 temperature probe, CORUS provides an accurate Conversion on the whole temperature range.

CORUS non-metrological firmware can be updated in the field without stopping operations and without breaking the metrological seals (MID). Its large integrated database can be customized to fit the customers’ needs. Revorded data and number records and be freely set.

CORUS is the base element of a complete and extremely flexible system, perfectly adaptable to the customer’s requirements:

> Consumption, Pressure, temperature monitoring through its large database for billing purposes

Monitoring functions for gas stations

>Remote reading solutions through PSTN, GSM, GPRS or TCP/IP with several integrated communication Protocols:

● IEC-62056-21 (IEC-61107)

● MODBUS RTU

● IDOM

 

Input/Output

 

> T, PT, PTZ Gas Volume Converter

> Conforms to European Standard EN 12405 – 1 and EN 12405-1/ A1

> MIS approval

> ATEX approval for installation in hazardous area (Zone 0)

> Large integrated database

> Compressibility according to AGANX 19, S-GERG, AGA 8 ( gross or detailed methods) or table of Z

> RS 232 and optical port for local/ distant communication

> High accuracy on the whole temperature/ Pressure range

> Autonomous or external power supply

> Large graphic display

> Possibility to download new firmware in the field

> Internal optional slot for “EX”:

   ● PSTN Modem

   ● RS-485 ports (x2)

   ● 2^nd pressure sensor input

 

Technical Features

 

Approvals

● MID:

- Module B – T 10114 rev.1

- Module D – n⁰ LNE 13281 rev.0

● Metrology: approval according to EN12405-1 and EN12405-1/A1 (European Standard)

● ATEX: device of category 1 approved to be used in hazardous area zone 0, ia IIC T4 classification with internal PSTN modem)

CE marking : Compliant with 89/ 336/EEC (EMC), 94/9/EC (ATEX) and 2004/22/EC (MID Directive)

 

Temperature Sensor

                                             

●Platinum PT 1000 (1000 Ω at 0⁰ C) probe

● Class A accuracy according to EN60751

● Casing : Stainless steel tube for insertion into a thermowell (Ø 6 mm)

● Cable Length: 2.5m or 0.8m

 

Pressure Sensor

 

● Absolute pressure sensor designed for CORUS application ( gauge pressure Sensors available on request)

● Sillicon piezo-resistive sensor

● Overpressure up to 150% of Pmax

● Available in 3 ranges:

- 0.9 to 10 bar absolute

- 3 to 30 bar absolute

- 7.2 to 80 bar absolute

● Connection adapter: ¼ “ BSP (Gas) Male

● Typical Accuracy: < 0.15 %rd over the whole pressure range

 

Volume Input

 

● Dry contact, Passive LF Reed type switch

● Maximum Frequency 2HZ

● Programmable input pulse weight (0.001, 0.01, 0.0, 1, 10, 100)

● Second LF input for coherence function

● Associated tampering detection input

● Cyble ® Sensor ATEX module

 

Compressibility

 

 Main formulas available:

- S-GERG

- AGA8 Gross method 2

- AGA8 Detailed method

- AGANX 19

- AGANX 19 modified

- Table of Z (16 coefficients formula)

- Fixed Z (PT conversion)

 

Accuracy

 

According to EN12405, overall accuracy on conversion factor is better than + 0.5% at reference conditions and better than 1 % at rated operating condtions.

● Typical accuracy better than + 0.2 %

 

Display and Keyboard

 

● Graphic display

● All Metrological data and alarm status available

● Translatable Messages to any language

● Specifics icons for application

● Possibility to show graphs for P, T, Z, C, Qm, Qb, P2

● 5-Button Keyboard

● Possibility to program main parameters by keyboard

● Possibility to display the whole database

 

Digital Inputs ( On/Off1, On/Off2, Tamper)

 

● Station Monitoring

● Normally open or normally closed programmable status

Connection to any On/Off signal type (station door contact, safety valve position, pressure switch,..) in hazardous areas.

 

Digital Outputs

 

2 Digital, isolated outputs fully programmable as:

● Unconverted volume pulse retransmission

● Converted volume pulse retransmission

● Alarm retransmission

● 4/20 mA output (through an external F/I “EX” Module)

 

Alarms

 

The following alarms are managed by the CORUS:

● Temperature (Min, Max, Sensor failure)

● Pressure (Min, Max, Sensor Failure)

● Conversion factor (Min, Max)

● Unconverted and converted flow-rate (Min, Max)

● Coherence

● Interval Consumption

● Tamper

● On / Off 1 and On/ Off 2

● External Power supply outage

● Warning thresholds (T, P, P2)