Heat Meters

Designed for accuracy in all applications:

combimeter ® II

Functional descriptionThe new combimeter ®II is a heatmeter which, with its advanced electronic metering technology, is desi-gned for the accurate metering of eventhe largest of heat loads.

Its flow metering unit is based on theelectromagnetic measuring principle,which works without moving parts,and is therefore particularly reliableand durable.

The electronic processor unit controlsthe entire meter, from the power sup-ply through the metering circuits andcalculations down to the informationdisplays.

The combimeter ®II provides the basisfor a wide range of consumption ana-lyses.

Performance featuresAll functions of the combimeter ®II arecontrolled electronically. The metercan be individually programmed usingWindows-based software programswith an easy-to-operate user interface.It can therefore be tailored to suit theneeds of the specific user or applica-tion.

An M-bus interface is integrated as astandard feature.

The flow metering unit is available in11 different sizes for flow ranges between 0.015 m3/h and 180 m3/h.

InterfacesIn addition to an integrated display,data can be read out in the followingways: (optional modules)• via an optical interface to the ZVEI

standard or• via the integrated M-bus interface to

the EN 1434 standard.

ApplicationThe combimeter ®II is a heat meter tai-lor-made to suit the special needs ofdistrict and communal heating.

Benefits• High accuracy over a long period

thanks to the combination of the magnetically inductive measuring principles and advanced electronics

• Wide field of applications thanks to the large number of hardware and software modules available

• Very wide metering range and low pressure drop

• High data security even in the event of a power failure

• Data tailored to the customer's needs thanks to individual program-ming options

• User-friendly installation and operation• S y s t e m a n a l y s e s t h r o u g h

max./min. memory• Individual billing using tariff con-

figurable counters.

The combimeter ®II is the static heatmeter, specially designed for districtheating.

Heat and Volume Meters

Intelligent processor unitThe processor unit contains high-techcircuits for coil excitation in the flowmetering unit, for measuring flowrates and temperature, for integration,calculation, logging and data display.

The combimeter ®II processor unithas been specially designed for ease ofuse. The new and attractive designwith its low overall height ensureseasy installation of the meter. Themeter can be conveniently read from aback lit two-line LCD. Two buttonspermit user-friendly control of thevarious display loops. All measure-ment inputs can be either screw ter-minal or plug-in connections.

The processor unit is connected to thepower supply. Reliable meter readingis ensured even if the voltage drops, asall information is stored in a non-vola-tile memory (EPROM), preventing anyloss of data.

Accurate flow metering unitThe flow metering unit is based on themagnetic induction measuring princi-ple. Its measuring cross section is rect-angular, with electrodes over the enti-re height. This gives it a large mete-ring range and makes it independentof the flow profile.

The unit is designed so that it corres-ponds to the maximum flow rate ofthe system and is available for instal-lation either in the flow or returnlines. The unit can be installedwithout straight lengths of pipe at theinlet or outlet and high metering accu-racy is ensured.

The flow metering unit satisfies therequirements of EN 1434 and its meas-uring characteristics are even betterthan those of the previous model.

A long-life battery ensures operationof the real-time clock in the event of apower failure and, at the same time,records how long power is off.

combimeter ® II

High performance from all components

combimeter ® II

Temperature sensorscombimeter ®II temperature sensorsare supplied with protection pocketsand cables for connection to the processor unit.

The combimeter ®II consists of• the flow metering unit• the processor unit• the temperature sensors

A wide range of meter sizes

The combimeter ®II is available in 11different sizes, i.e. with 11 differentflow metering units covering flow ran-ges from 0.015 m3/h to 180 m3/h.

The flow metering units are sized asillustrated, Qs representing the maxi-mum admissible continuous flow. Allmeters can record Qp + 50%.

Qp40

6015

25

6

10 1,5

2,53,5 80

120

flow Qp in m3/hour

combimeter ® II

Accessories for tailored solutionsExpansion modules

combimeter ® II has two plug-in locations for expansion modules toconnect external equipment.

Analog moduleThe analog module has two electrical-ly isolated 4-20 mA outputs as a stan-dard feature. These two outputs canbe programmed separately, for exam-ple, for flow rate, heat load, flow tem-perature, return temperature or tempe-rature difference.

Digital I/O moduleThe digital I/O module has two con-tact inputs with a common earth con-nection as well as two electrically iso-lated passive outputs.

RS-232 moduleThe communication module RS-232 isa serial interface for communicationswith external equipment, e.g. a PC.

M-bus interfaceThe M-bus interface is integrated asstandard.

Software

combitest ® IIThe combitest ® II software is an M-bus-based tool for reading out themeter configuration. It runs underWindows 95 and is used for• reading out the meter data (apart

from the data log)• archiving and printing out• implementing customer-specified

changes

combiset ® IIcombiset ® II is the central service software tool for the user. It is a menu-driven, easy-to-use Windows 95 programme for setting a customisedapplication, e.g. configuration of heatand volume meters, tariff setting anduser displays.

combilog ® IIcombilog ® II reads out the data logs ofthe heat meter, archives them, pres-ents the meter readings and prints dia-grams and tables. combilog ®‚ II is alsobased on M-bus and runs underWindows 95.

combimeter ® II

Data logging functionsTwo logging modules are active in thecombimeter ®II:

• Data log for consumption values• Change log for faults and operator

changes

The values from both logs can be readusing a PC.

The data logis divided into two sections:

• The short-time log contains averagevalues for the following:- Flow rate- Heat output*- Flow temperature*- Return temperature*All these values are time-stamped.

• The long-run log contains the following counter values:

- Energy consumption*- Volume of water- Hours run- Forward energy*- Tariff counters (energy* and volume)

These values are time-stamped withthe date, year and weekday.

* only applies to the heat meter.

The short-run log is normally used fortroubleshooting and optimisation. Thelong-run log is normally used for con-sumption analyses; the values can beused for calculations, e.g. averagereturn temperature.

The change logThe last 30 faults or changes (e.g.clock adjustments) are continuouslyrecorded and time-stamped. Thus following types of failure can be iden-tified:

- Power failure- Temperature sensors- Internal communications- Check sum- Clock adjustment

Logging frequency Data recorded Logging period

Every 6 minutes Flow rate (ø) 2 days

Heat output (ø)

Every hour Flow temperature (ø) 14 days

Return temperature (ø)

Every 24 hours Volume counter 1 year

1st and 15th of every month Hours run 7 years

Tariff counter

Forward energy (ø)

(flow temperature x volume)

This table shows the logging frequencies and the logging periods.

The button with the arrow pointingdownwards is used:

- to change to the next window in the active loop.

- to change to the next loop- to change to the service loop.

The button with the arrow pointing tothe right is used:

- to change to the windows behind each other

- to configure within the service loop- to change to the next loop- to change to the service loop.

combimeter ® II

User-friendly control of the displayThe display of the combimeter ®II hasthree user loops and a service loop.

Each user loop may contain up to 24individual windows.

Standard settings of the loops

loop 1 loop 2 loop 3 Service loop

The first loop is the main loop andcontains the current data for flow,energy and time/date as a standardfeature. The second and third loopscan be used as desired for all otherfunctions, e.g. min. max. tariffs etc.All three user loops can be individual-ly programmed with the combiset ® IIsoftware.

Information on certain functions isspread over two windows. In this casethe display automatically alternatesevery four seconds between these twowindows.

Furthermore, there are windows thatare "behind each other". This is thecase when windows have the samefunction but display different values,e.g. 13 max. or min. storage intervals.These windows can then be activatedconsecutively with the control but-tons.

6 minutes after operation of the but-tons the meter automatically returnsto the main window.

The fourth loop is a "service loop".This loop contains windows that areavailable to the service technician forinformation or configuration purpos-es. The windows in this loop cannotbe changed.

Simple controlThe displays are accessed with twocontrol buttons on the front panel ofthe meter, one with an arrow pointingto the right, the other with an arrowpointing downwards.

combimeter ® II

Information displaysThe display permits the indication of awide variety of informative data:

Main ENERGY counterCurrent temperature difference and output

Hour counter (2 decimal places)

Current temperatures 1 and 2Main VOLUME counterCurrent flow rate

Current flow rate

Current temperature difference and output

Hour counter (no decimal places)

Current temperatures 1 and 2Main ENERGY counterMain VOLUME counter

MAX. output [## = index 1-13] + temp. 1 & 2

Date and time intervalPulse counter 1Pulse counter 2

MAX. flow rate [## = index 1-13] + temp. 1 & 2

Date and time intervalMIN. flow rate [## = index 1-13] + temp. 1 & 2Date and time interval

Main ENERGY and VOLUME readings

1st and 15th of the last monthTotal consumption of previous year with averageflow temperature and temperature difference

Consumption of previous year up to set day with ave-

rage forward flow and temperature difference Consumption of this year up to set day with averageforward flow and temperature difference

Tariff counter # [1-13]

(example work week type]Volume and energy readings on the M-bus set day(reading date)Forward energy counter (flow temperature) counts: (volume pulses)* Tf/100Current time: summertime, time of dayYear, month, date and weekday (Monday = 1)

The default settings display the follo-wing windows:

• in loop 1windows 2,4,6,30

• in loop 2windows 16,18,19,20

• in loop 3windows 7,10,13

However, the first three loops can beindividually programmed as requiredwith the software module combiset® II.

No. First display Second display Description

XX 1234.567 MWh40.0° 123,4 kW

XX 1234.567 MWht1 = 80° t2 = 40°

XX 1234.567 m3

1.23 m3/h

XX 1.23 m3/h40.0° 123,4 kW

XX 12345 ht1 = 80° t2 = 40°

XX 1234.567 MWh1.2345.67 m3

XX ># # 0.00 kWYYMMDD hhmm/hhmm

XX I1 = 1234567I2 = 1234567

XX > ## 0.97 m3/hYYMMDD hhmm/hhmm

XX < ## 0.00 m3/hYYMMDD hhmm/hhmm

XX YYDDMM1234.567 MWh

XX 27.808 MWhYYMMDD / YYMMDD

XX 17.756 MWhYYMMDD / YYMMDD

XX 15.284 MWhYYMMDD / YYMMDD

XX T# hhmm/hhmmww 1234.567 MWh

XX RD: YYMMDD52346 m3

XX 1234567 E

XX [S] hh:mmYYYY-MM-DD W

XX ># # t1 = 80°t2 = 40°

XX ># # t1 = 80°t2 = 40°

XX <# # t1 = 80°t2 = 40°

XX YYDDMM1234.567 MWh

XX 681.94 m3

f = 79,3° t = 33,5°

XX 402.84 m3

f = 81,5° t = 34,1°

XX 389.04 m3

f = 84,3° t = 34,1°

XX T# hhmm/hhmmww 1234.567MWh

XX RD: YYMMDD23511 kWh

1

2

3

4

5

6

7

8

10

13

16

18

19

20

21

22

24

30

combimeter ® II

Information display (volume meter)

Main VOLUME counterCurrent flow rate

MAX. flow rate [# # = index 1-13]Date and time interval

MIN. flow rate [# # = index 1-13]Date and time interval

Current time: summer time, time of dayYear, month, date and weekday (Monday = 1)

Main VOLUME readinglast 1st and 15th of last month

Tariff counter # [1-13](example work week type)

Volume counterHour counter (2 decimal places)

Volume counterHour counter (no decimal places)

Hour counter (2 decimal places)

Current flow rate

Hour counter (no decimal places)

Volume consumption, last year

Volume consumption, last year up to today

Volume consumption, this year up to todayXX 1234.567 m3

YYMMDD / YYMMDD

XX 1234.567 m3

YYMMDD / YYMMDD

XX 1234.567 m3

YYMMDD / YYMMDD

XX 12345 h

XX 1.23 m3/h

XX 12345.67 h

XX 1234.567 m3

12345 h

XX 1234.567 m3

1234.567 h

XX T# hhmm/hhmmww 1.2345.67 m3

XX YYMMDD1.2345.67 m3

XX [S] hh:mmYY-MM-DD W

XX < ## 0.00 m3/hYYMMDD hhmm/hhmm

XX > ## 0.97 m3/hYYMMDD hhmm/hhmm

XX 1234.567 m3

1.23 m3/h3

10

13

30

46

51

100

102

103

104

105

114

115

116

No. First display Description

Mesuring accuracyEnergy accuracy range in accordancewith EN 1434, class 2

Met

erin

g er

ror

(in

%)

Flow rate in % of Qs m3/h

5

4

3

2

1

0

-1

-2

-3

-4

-5

1% 2 % 5 % 10 % 50 % 100 %

Typical accuracy bandwidth

Head sensor Cable attached sensor

combimeter ® IIPressure drop curves

Typical pressure drop curves forcombimeter ®II type 1.5 - type 120

0,3

0,25

0,2

0,15

0,1

0,05

delta

p [b

ar]

00 20 40 60 80 100 120

Q [m /h]3p

Qp 80

Qp 60 Qp 120

Qp 40

Qp15

Qp 25Qp10

Qp 3,5

Qp 6Qp 2,5

Qp 1,5

Dimensions150 37,5

195

22,5

35,5

153

62,5 1377

Processor unit

Sensor with protection pockets

Flow metering unit

85 / 120 56

50 / 851/2’’ SW 2466

ø 7

1/2’’

SW 24

ø 8

58 / 93

130 76SW 27

130 967869

21,5

1’’

40 87

13,5

78

65

3/4’’

96

2168

combimeter ® II

Dimensions

Flow metering unitType 2.5(screwed connections)

Flow metering unitType 10 - 120

170

18 21,5

69

13,5

ø 68

ø 115

96

96

21

ø 14

A

d

142135

b

kD

88

176

77

DN

80 / 12040 / 60

15 / 2510

DN mm 40 50 65 80 100A mm 300 270 300 300 360D mm 150 165 185 200 235k mm 110 125 145 160 190b mm 20 22 24 26 28d mm 18 18 18 18 23d Number 4 4 8 8 8

Flow unitType

combimeter ® II

Technical specificationsProcessor unit 1.5 2.5 3.5 6 10 15 25 40 60 80 120 Unit

Total energy 9 999 999 - 999 999.9 - 9 999.999Display Energy unit kWh - MWh - GJ - Gcal - MBTUReadings Total volume 9 999 999 - 999 999.9 - 99 999.99 - 9 999.999

Current values Output - Flow rate - TemperatureTemperature Type Pt100 / 4-wire or 2-wiresensorSensor current peak = 2. rms = 0.07

Temperature Metering cycle per 2input Maximum ∆* max ± 110

temperaturedifferenceMinimum ∆* min ± 3temperaturedifferenceStart-up range ∆* ± 0.5Differential temperatureAbsolute * 1 ... 160temperaturemeasuring rangeMax. energy Ps 0.2 0.33 0.47 0.80 1.33 2.0 3.3 5.3 8.0 10.7 16.0 MW

Energy Max. energy Pi 0.19 0.32 0.45 0.77 1.28 1.9 30.2 5.1 7.7 10.2 15.4 MWrange at qp

Min. energy Pi 1.5 2.5 3.5 6 10 15 25 40 60 80 120 kWat qi

Power Operating Un 230 (24) + 10% - 15 %, 50 Hzsupply voltage

EnergyconsumptionDimensions H x W x D 195 x 150 x 65 mm

Divers Weight 0.9 KgProtection class IP 54

Flow metering unit 1.5 2.5 3.5 6 10 15 25 40 60 80 120 Unit

Flow Maximum qs 2.25 3.75 5.25 9 15 22.5 37.5 60 90 120 180 m3/hranges Nom. flow qp 1.5 2.5 3.5 6 10 15 25 40 60 80 120 m3/h

Minimum qi 0.015 0.025 0.036 0.06 0.1 0.15 0.25 0.4 0.6 0.8 1.2 m3/hStart-up 0.0015 0.0025 0.0036 0.006 0.010 0.015 0.025 0.04 0.06 0.08 0.12 m3/h

Pressure drop ∆p 0.16 0.09 0.16 0.10 0.10 0.10 0.25 0.11 0.25 0.11 0.25 BarOper. pressure max. PN 16 16 / 25 25Pipe/flange DN 3/4’’ 1’’ / 25connections 40/50/65/80/100 mmPipe/flange Total length 130 130 - 190 300/270/300/300/360 mmconnectionsPipe/flange Material brass brass/grey cast iron grey cast ironconnectionsMedium Working range 20-90 20 - 130 C°

in °CConductivity min. 20 µS/cmInstallation Position as requiredWeight (incl. 3 m cable) 1.3 1.8 / 4.2 13.8/13.8/14.4/16.5/19.2 kgCable length 3 m and 10 mProtection class IP 54

Energy meter UnitBasic Ambient class Class C (+5°C to +55°C, installation in industrial plants)features Protection class IP 54

Output - Flow rate - TemperatureUnit kWh - MWh - GJ - Gcal - MBTU

Readings Total volume 9 999 999 - 999 999.9 - 99 999.99 - 9 999.999 m3

in Current volume Output - Flow rate - Temperaturedisplay Temperature sensor Type Pt100 / 4-wire or 2-wire

Sensor current Peak = 2. ms = 0.07Metering cycle Period 2 sMaximum temp. ∆*max ± 110 Kdifference

Temperature Minimum temp. ∆*min ± 3 Kinput difference

Start-up range ∆* ± 0.5 Kdifferential temp.Absolute temp. * 1 ... 160 °Cmetering range

Volume Pulse values 0.1 - 1 - 2.5 - 10 - 25 - 100 - 250 - 1000 Ipulse input Frequency max. 50 Hz

Pulse duration 10 - 150 msInput voltage 4.5 ... 5.5 V(open)

(Contact or Input voltage max. 1.4 Vopen (closed)collector) Input impedance min. 820 kPower supply Operating voltage Un 230(24) + 10% - 15%, 50 Hz Vac

Energy consumption 3 WMiscellaneous Dimensions H x B x T 195 x 150 x 65 mm

Weight 0.9 kg

combimeter ® II

Technical specifications

Viterra Energy Services LtdHigh MillMill St.CullingworthBradfordBD13 5HA

Phone 01535 270200Fax 01535 270282e-mail: sales@viterra.co.ukWeb site: www.viterra.co.uk

Energy meter UnitBasic Ambient class Class C (+5°C to +55°C, installation in industrial plants)features Protection class IP 54

Output - Flow rate - TemperatureUnit kWh - MWh - GJ - Gcal - MBTU

Readings Total volume 9 999 999 - 999 999.9 - 99 999.99 - 9 999.999 m3

in Current volume Output - Flow rate - Temperaturedisplay Temperature sensor Type Pt100 / 4-wire or 2-wire

Sensor current Peak = 2. ms = 0.07Metering cycle Period 2 sMaximum temp. ∆*max ± 110 Kdifference

Temperature Minimum temp. ∆*min ± 3 Kinput difference

Start-up range ∆* ± 0.5 Kdifferential temp.Absolute temp. * 1 ... 160 °Cmetering range

Volume Pulse values 0.1 - 1 - 2.5 - 10 - 25 - 100 - 250 - 1000 Ipulse input Frequency max. 50 Hz

Pulse duration 10 - 150 msInput voltage 4.5 ... 5.5 V(open)

(Contact or Input voltage max. 1.4 Vopen (closed)collector) Input impedance min. 820 kPower supply Operating voltage Un 230(24) + 10% - 15%, 50 Hz Vac

Energy consumption 3 WMiscellaneous Dimensions H x B x T 195 x 150 x 65 mm

Weight 0.9 kg

combimeter ® II

Technical specifications

Viterra Energy Services AGGrugaplatz 445131 Essen - Germany

Phone: + 49 201/459-3500Fax: + 49 201/459-3508E-Mail: export@viterra-es.comWeb Site: www.viterra-es.com