8/13/2019 Elster-Instromet Encal3000 GC

1/4

EnCal 3000Energy measurement analyser

Applications

Fiscal Energy measurementQuantitative measurement of natural gas componentsGas quality control measurement

Brief information

The EnCal 3000 is a gas chromatograph specially designed for natural gas energymeasurements. This state-of-the-art analyser uses chromatography componentsbased on the latest micro electro-mechanical systems (MEMS) and capillary columntechnique. This results in highly repeatable and accurate analysis results. The com-pact, explosion proof design includes the analytical hardware, stream selection andall required electronics for standalone operation.

The capillary column technology used in the EnCal 3000 has a superior performancecompared to the conventional used packed column technique. Optimum peak sepa-ration in combination with a very sensitive and linear TCD detector results in a systemwith a high accuracy over a large range of gases. Since the carrier gas pressure iselectronically controlled ambient temperature changes have no inuence on peakretention times. The design of the EnCal 3000 is such that the unit can be placed out-doors close to the sample point without the need of an expensive temperature control-led environment.

Communication with the EnCal 3000 can be established using the TCP/IP connectionand two Modbus ports. The conguration of the EnCal 3000 is carried out with the helpof the software package RGC 3000. This software package can be used to congurethe (freely programmable) Modbus listing, the analyser method, alarm settings, andall other available parameters in the analyser. RGC 3000 is the only user interfaceto the EnCal 3000, which means a separate control unit is not required to operate

the instrument or to change any conguration parameters. The TCP/IP connection of-fers a lot of communication possibilities, like networking capabilities. By using Mod-bus via TCP/IP multiple instruments such as ow computers can be connected to theEnCal 3000. Besides the RGC 3000 software package, the unit can be supplied with apowerful diagnostic software tool, which can be used to analyse the internally storeddata. 35 days of data is stored in the EnCals solid state memory in accordance withthe API 21.1 standard. With the help of the History logger software, this data can beretrieved, presented and transferred to HTML based reports.

The modular design of the EnCal 3000 enables the servicing of the analyser by non-specialist personnel and keeps instrument down-time very short. The use of the MEMSbased components results in far lower consumption of utilities like the Helium carriergas. All of this contributes to lower operational costs compared to traditional gas chro-matographs.

* Detailed analysis up to n-C 8 (C6+) respectively n-C9 (C9+) including all isomers and other hydrocarbons, no backush

Main features

C 6+ within 3 minutes*

C 9+ within 5 minutes*

Repeatability < 0.01 %Double block and bleedStream select for 5 streams

TCP/IP communicationData storage in accordancewith API 21.1 standard

IP 66 outdoor housingCalculations in accordance withISO 6976, GPA 2172 or GOST 22667

8/13/2019 Elster-Instromet Encal3000 GC

2/4

EnCal 3000: Energy measurement analyser

The main functions of the RGC 3000 con-guration software are:

Conguration of the analyser-method and applicationSetting of alarms + limits-Printing of chromatograms,-conguration and analysis results

Performing manually activated-calibrations

A special feature of the RGC software isthe recalculation option that enablesthe user to change an integration param-eter and check the effect of this changewithout performing a new analysis. TheEnCal 3000 simply recalculates the anal-ysis results based on the raw data of apreviously performed analysis. This is atime-saving option, whenever the oper-ator needs to optimize the analysis.

The RGC 3000 software can also beused to update the embedded softwareof the gas chromatograph, should anynew software releases become availa-ble. This can be done locally or remotely,provided the EnCal 3000 is connected toa network, which can be accessed re-motely. Because all analyser parametersare available electronically, the remotecontrol capabilities are much more valu-able than with traditional gas chromato-graphs. The column head pressure andtemperatures of the analytical compo-nents, for example, can be changed orchecked remotely.

The Modbus conguration of the EnCal3000 is freely programmable. It can becustomized to the application and tothe equipment communicating with theanalyser. Both the serial Modbus and theModbus via TCP/IP can be tested usingthe WINDCS software tool.

In todays natural gas market it is be-coming increasingly important to havereliable energy measurement data con-cerning the gas transported through thepipeline. To secure the analysis data ofthe EnCal 3000 the analyser is equippedwith an internal data storage of 35 days.This means that all analysis and calibra-tions performed during this period canbe retrieved, even if all communicationbetween the instrument and external de-vices such as ow computers has failedfor a certain period of time.

This data is stored in accordance withthe API 21.1 standard and can be re-trieved with a software tool called His-tory logger. Using this software tool theinternally stored data can be retrieved,viewed, stored on a PC and printed outin congurable reports.

Communication with the EnCal 3000 canbe established using the TCP/IP connec-tion and two congurable (RS 232/485)Modbus ports. If a PC is connected run-ning the RGC 3000 software package,this always uses the TCP/IP connection.This PC with the RGC 3000 softwareis the only user interface with the gaschromatograph. This means a separatecontrol unit is not required to operate theinstrument or to change any of the instru-ments conguration parameters.

The TCP/IP connection offers a lot ofcommunication possibilities, like net-working capabilities. By using Modbusvia TCP/IP, multiple instruments such asow computers can be connected to theEnCal 3000.

Conguration software

EnCal 3000

Ethernet 10 base-T

RGC 3000 protocolSwitch

Modbus over TCP/IP

Flowcomputer

Elster-Instrometsupervisory system

RGC 3000local

API data storage Data communication

8/13/2019 Elster-Instromet Encal3000 GC

3/4

An important part of the entire measure-ment system is the sample retractionand sample transport. The gas that is re-tracted from the pipe-line must be a rep-resentative sample, condensation mustbe prevented and the pressure must, inmost cases, be reduced from very highpressures down to 2-4 barg.

Depending on company or country regu-lations several systems can be used. Themost economic system is a (retractable)sample probe with integrated pressurereduction. The main advantage of thesesample probes is that the pressure re-duction is done inside the pipeline andthe heat capacity of the gas in the pipe-line prevents the gas from condensa-tion. The sample probe contains an inte-grated membrane, which separates anyfree liquids that might be present in thepipeline from the gas before it can enterthe tubing leading to the EnCal 3000 an-alyser. To prevent the gas from conden-sation during the transport to the EnCal3000 it is recommended to provide heattracing of the transport lines. Whetherheat tracing is required and what ca-pacities are needed depends largely onthe dewpoint of the gas and the ambienttemperatures.

The EnCal 3000 uses Helium as a car-rier gas. To make sure that an uninter-rupted supply of Helium is guaranteed,the use of a Helium switch-over systemis recommended. This is a pressure reg-ulator to which two gas cylinders can beconnected. The pressure of both bottlesis reduced to the required value with asmall pressure difference between thetwo reduced pressures. The bottle with

the higher pressure is depleted rst andonce the pressure of this bottle is lowerthan the pressure of the second bottle,the supply is taken over by the secondbottle enabling the user to replace therst bottle. To protect the analyser againstfailure of the pressure regulator, the useof a safety relief valve at the outlet of thepressure regulator is recommended.

The calibration gas is a very importantfactor and determines the overall accu-racy of the complete measurement sys-tem! After all, the EnCal 3000 can neverbe more accurate than the calibrationgas it is calibrated with. The accuracy ofthe certicate is, of course, important buton top of this, there are several other is-sues to be considered, e.g. the optimumcomposition, the ambient temperaturesof the gas cylinder and the possible con-densation of the higher hydrocarbons inthe calibration gas. Elster-Instromet canadvise you on each of these subjectsand we supply all required accessories,such as pressure regulators, bottle heat-ers and even complete cabinets or bottlestands for outdoor installations.

In an ideal situation, the EnCal 3000 isplaced as close to the sample point aspossible. However, in most situations,especially where two or more gases ofdifferent meter runs are to be sampled,there will be a certain distance to thesampling points. To make sure that thelag time between the various samplepoints and the analyser is acceptablea fast loop system is required. The En-Cal 3000 has a built in fast loop system.This means that if the analyser is runningseveral streams in a sequence the nextstream to be analysed will be ushedautomatically with a ush rate of approx.20-30 NL/hr. This is sufcient to ush atleast 100 meters of 1/8 sample line. Byinstalling two ow meters behind theEnCal 3000, the user can see both thenormal gas sample ow and the samplebypass ow. Since the fast loop bypass-es the moisture lter in the EnCal 3000, itdoes not negatively inuence life time ofthe lter. The internal fast loop system ofthe EnCal 3000 saves substantial costscompared with individual fast loops persample stream.

PipelinePipeline H e

l i u m

C a

l i b r a t i o n g a s

H e

l i u m

VENTS

DATAPower

EnCal 3000

Sampling

Calibration and carrier gas

Multi stream sampling

8/13/2019 Elster-Instromet Encal3000 GC

4/4

Your contacts

A13.12.2007 EnCal 3000 EN02

S u b j e c t t o c h a n g e w i t h o u t p r i o r n o t i c e

A l l r i g h t s r e s e r v e

d

Germany Belgium SingaporeElster GmbH Elster-Instromet N.V. Elster-InstrometSteinern Str. 19 - 21 Rijkmakerlaan 9 Singapore Representative Ofce55252 Mainz-Kastel 2910 Essen 80 Marine Parade RoadT +49 6134 605 0 T +32 3 670 0700 09-04 Parkway ParadeF +49 6134 605 223 F +32 3 667 6940 Singapore 449269www.elster-instromet.com www.elster-instromet.com T +65 6247 7728info@elster-instromet.com sales@elster-instromet.com F +65 6247 7729

Technical dataAnalytical hardware 2 parallel isothermal GC modules with narrow-bore capillary column technology in combination with MEMS based ana-

lytical components

Analysis output Full composition of natural gas up to C 6+ or C9+ (option)*Heating value, density, Wobbe index

Gas composition range N 2 : 0 - 22 % neo-C 5 : 0 - 0.25 %CH4 : 55 - 100 % C5 : 0 - 0.25 %CO2 : 0 - 20 % C6 : 0 - 0.20 %C2H : 0 - 14 % C7 : 0 - 0.10 %C3 : 0 - 10 % C8 : 0 - 0.05 %C4 : 0 - 10 % C9+ : 0 - 0.05 %Concentrations outside these ranges and other components on request

Performance Repeatability (according to ISO 6976 par. 9.1.1): < 0.01 % for all calculated propertiesDetection limit for C5: 5 ppmAnalysis time: 3 min. for C6+ analysis, 5 min. for C 9+ analysis

Ambient conditions Temperature: -20 C to +55 C

Dimensions Base 37 cm x Height 37 cm ( 14 x Height 14)

Weight < 30 kg

Approvals ATEX II2G E Ex d IIB T4, KEMA 05ATEX2191IP 66, Vibration and shock test in acc. with IEC 60068-2-31 and 64EMC according to EN 61000-6-2 and EN 61000-6-4PTB Metrological Certicate Reference No. PTB-3.31-4016861

Power supply 24 VDC, 18 W nominal (50 W start-up peak) for non-heated version24 VDC, 120 W nominal (170 W start-up peak) for heated version (ambient < 0 C)

Interfaces Ethernet UTP 10 Base-T for ModBus TCP/IP and PC link (max. distance 100 meter)Two RS 232/485 ports for ModBus RTU or ASCII (3 wire connection for both RS232 and 485)

Analyser Complete stand-alone operation, including al l calculations and generation of report formats,without need for operator intervention. Calculations in acc. with ISO 6976, GPA 2172, GOST 22667 or ASTM D3588

PC requirements Windows 2000 or Windows XP professional edition (Service Pack 1 or higher)1000 MHz processor, 512 MB RAM, CD-rom player, free Ethernet port.

Data logging History Log: local storage of last 35 days of all analytical data (analysis, events, alarms,averages, last chromatogram, calibration data) in accordance with API Report 21.1

All data can be made available in XML formatSample gas inlets Input pressure range 2-4 barg, sample gas must be free from particles and liquid, temperature < 55 C

Double block and bleed stream selection for up to 5 streams and 1 calibration gas.Integrated fast loop system with bypass ow of 20-30 Nl/hr. (software selectable)

Helium Quality N5.0, s upply pressure 5.5 0.5 barg, consumption 8 ml/minPressure regulator should contain a safety relief set at 6.5 barg

Calibration gas Supply pressure 2-4 barg. Consumption 600 ml/day (@ atm. pressure)Composition depending on application

* Detailed analysis up to n-C 8 (C6+) respectively n-C9 (C9+) including all isomers and other hydrocarbons, no backush

EnCal 3000: Energy measurement analyser