LQM III

  • complies with all requirements stipulated in OIML R 75, EN 1434 standards,
  • battery operated calculator permanently with 5 year life plus 1 year,
  • operation with any flow meters installed on the supply and return of the heating system,
  • non volatile memory enabling to store data for last 48 hours, 60 days, 24 months and 12 years; memory could be enhanced,
  • battery voltage measurement and indication,
  • wide possibility of configuration of parameters and registers,
  • programming of thresholds for heat power, flow rate and temperature in order to make calculations of over - threshold heat energy consumption,
  • possibility of measure heat energy in the second heating system e.g. warm tap water (additional pair of temperature sensors is necessary),
  • possible cooperation with 4 additional meters, with pulse output,
  • optical port,
  • communication interfaces: RS232, RS485 interfaces, M-BUS or Lon Works,
  • communication of meters with LSD type local data station in M-BUS network.

Technical data

Item
unit of heat energy (the main calculator contains 8 digits)
GJ, mW
unit volume of the water
m3
temperature range of the water
°C
temperature difference for heating
°C
maximum permissible error
%
power range
kW, MW
flow range
m3/h
supply voltage
V
time of battery operation
year
degree of protection IEC-529
-
ambient temperature
°C
relative humidity
%
conformity with standards
-
Item LQM-III
unit of heat energy (the main calculator contains 8 digits)
GJ, mW
 0,001 to 1; 0,001 to 0,01
unit volume of the water
m3
 0,001 to 1
temperature range of the water
°C
 from 1 to 180
temperature difference for heating
°C
 from 3 to 160
maximum permissible error
%
 ±(0,5+3/Δt)
power range
kW, MW
 1 - 999, 0,01 - 99,99
flow range
m3/h
 0,001 - 1
supply voltage
V
 3,6
time of battery operation
year
 5
degree of protection IEC-529
-
 IP-54
ambient temperature
°C
 from 5 to 55
relative humidity
%
 < 90
conformity with standards
-
 PN-EN 1434 parts 1 to 6, PN-EN 61107

Principle of operation

The measurement of the volume of energy is reduced to the volume measurement of flowing water and temperature difference. The values measured are multiplied each other and heat coefficient and the
products are integrated.
The calculator can be configured and operate as heat meter and cooling meter at the same time. In case of cooling meter, the temperature difference is calculated based on the formula t2-t1 and in case of heat
meter, temperature difference is calculated based on the formula t1-t2. The calculator enables to set minimal temperature difference below which calculations for heat are avoided (within the range from 0° to 3°C).
The measurement of temperature is made every 12 seconds, adding the volumes is made after each pulse, integration of the heat is being made (integration period) minimum every 30 seconds, but only when the growth of the volume occurred in this period.
Heat coefficient is dependent on t1 and t2 and it is calculated based on algorithm produced by designers of the calculator.
LQM-III calculators operate based on microprocessors and they are made by SMD technology. The calculator cooperates with flow transducers mounted on inlet or outlet circuit of heat exchange system.
Indicated values being measured are read out on liquid crystal display and moreover they can be read by different interfaces for the remote reading with optical interface inclusive.
In order to measure the volume of water one should make use of the flow transducer with pulse output and there is possibility to configure any pulse constant.
The data measured are stored in non volatile memory of archive registers in four time cycles. In hourly cycle 48 registrations of data are made, in daily cycle 60 registrations are made, in monthly cycle 24 registrations are made and in annual cycle 12 registrations are made. These data can be watched on the display. In further part of the description, the details regarding kind of data that are being registered in particular cycles were presented.
LQM-III-K can be configured as LQM-III-D that means that it can measure heat in two independent circuits for heat measurement. In such configuration four temperatures are being measured but one of additional pulse inputs is treated as the input of flow transducer of the second heat circuit for heat measurement. Both heat circuits have the same properties and can be configured as it was described above. All measurement units that concern the second heat circuit for heat measurement are being displayed with ‘ (prim) mark in the upper left corner of the display. 

Communication interfaces

  • possible installation in meters in operation,
  • ideal for remote readout systems, monitoring and AMR,
  • a number of heat meter indications available.
DESCRIPTION
Each calculator is equipped in a socket suitable to connect different interfaces.


INTERFACE M-BUS

This module was developed according to EN 1434-3 Standard.

Transmitted data:
  • User number
  • Error code
  • Serial number
  • Energy
  • Volume
  • Power
  • Flow rate
  • Higher temperature
  • Lower temperature
  • Temperature differrence
  • Tarriff energy
  • Time of operation
  • Time of operation with error
  • Time and date of calculator clock
  • Average temperature for last 24 h (higher)
  • Average temperature for last 24 h (lower)
  • Average flow rate for last 24 hours

INTERFACE LON WORKS
Technical data:
  • Power supply: 24V AC/DC ± 30%
  • Power input: 30 mA
  • Transmission speed: 78 kBit/s
  • Transceiver: FTT-10A
  • Cable recommended: Belden 85102 2 x 1,3 type two wired cable spiral
  • Length of segment: 500 - 2700 m, depending on network architecture
  • Ambient temperature: from 0°C to 55°C
  • 26 standard types of SNVT network variables.

LonWorks interface complies the requirements of LonMark standard. The list of SNVT is available on request.

 

 
 

 

Volume parts

 

 JS90-NC  JS130-NC

 


 

  • Working temperature: 90 °C
  • Pressure: PN 16
  • Working position: H/V
  • Working temperature: 130 °C
  • Pressure: PN 16
  • Working position: H
 Catalogue (download PDF) Catalogue (download PDF)

 

 WS120-NC  MWN130-NC
 
 
  • Working temperature: 120 °C
  • Pressure: PN 16
  • Working position: H
  • Working temperature: 130 °C
  • Pressure: PN 16
  • Working position: H/V
Catalogue (download PDF) Catalogue (download PDF)

 

 MP130-NC
 
  • Working temperature: 130 °C
  • Pressure: PN 16
  • Working position: H
Catalogue (download PDF)

Temperature sensors

Heat meter LQM-III working with sensors type Pt 500.

 

Standard heat meters combinations

Heat meters LQM-III working with volume parts (table) and sensors Pt 500.

 Type of volume
parts
 DN
[mm]
 Qn
[m3/h]		  Tmax
[°C]
 Working
position
 JS90-0,6 NC
  15  0,6  90  H, V
 JS90-1 NC  15  1  90  H, V
 JS90-1,5 NC
 15  1,5  90  H, V
 JS90-2,5 NC
  20  2,5  90  H, V
 JS130-3,5 NC
  25  3,5  130  H
 JS130-6 NC
  32  6  130  H
 JS130-10 NC
  40  10  130  H
 WS120-1 NC
  15  1  120  H
 WS120-1,5 NC
  15  1,5  120  H
 WS120-1,5 G1 NC
  20  1,5  120  H
 WS120-2,5 NC
  20  2,5  120  H
 WS120-3,5 NC
  25  3,5  120  H
 WS120-6 NC
  32  6  130  H
 WS120-10 NC
  40  10  130  H
 MP40 NC
  40  10  130  H
 MP50 NC
  50  15  130  H
 MP65 NC
  65  25  130  H
 MP80 NC
  80  40  130  H
 MP100 NC
  100  60  130  H
 MWN50 NC
  50  15  130  H, V
 MWN65 NC
  65  25  130  H, V
 MWN80 NC
  80  40  130  H, V
 MWN100 NC  100  60  130  H, V
 MWN125 NC  125  100  130  H, V
 MWN150 NC
  150  150  130  H, V
 MWN200 NC
  200  250  130  H, V
MWN250 NC
 250  400  130  H, V

 

Trade contact

Export Department

E-mail: export@powogaz.com.pl
Phone: +48-61 841 81 39
Fax: +48-61 847 25 48

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