Commissioning
6 720 808 928 (2017/06)38
6.8 Integral heat meter (if fitted)
The heat meter complies with the requirements of the European
Directive MID 2004/22/EC modules B and D and of the standard EN
1434 class 2.
Technical data
The heat meter is designed on the basis of the proven fluid oscillation
principle. Due to the use of a static flow sensor, the heat meter does not
have any moving parts and thus no wear. The fluid oscillation principle
guarantees a high stability and repeatability for a reliable and precise
measurement of flow and thermal energy.
The heat meter consists of a static fluid oscillator flow sensor for flows
from qp 0.6 - 2.5 m
3
/h, in permanent connection with a removable
integrator and a pair of temperature sensors covering an operation
range from 5 °C - 90 °C.
Main features
The heat meter optimized for the measurement and calculation of energy
consumption in district or local heating systems.
• Complies with the requirements of the European Directive MID
2004/22/EC modules B and D and of the standard EN 1434 class 2.
• Flow of qp 0.6 - 2.5 m
3
/h.
• Corrosion resistant materials.
• No moving parts, thus no wear.
• Not sensitive to dirt.
•Stable.
• Direct pick-up of voltage pulses without reflectors.
• Long-term stability, accurate and reliable measurement.
• Easy to operate and read.
• Non-volatile EEPROM memory.
• 18 monthly energy values for heat energy, volume and for the set day
values.
• Self-monitoring of conditions.
Functions
• Recording heat consumption by means of measuring the flow and
temperature difference.
• Displaying consumption data:
– 18 monthly energy and volume values.
– Set day values.
– Operating data.
– Self-monitoring with error display.
Energy calculation
The flow sensor records the flow. Using a microprocessor, the integrator
calculates the temperature difference and calculates the thermal
energy, respectively the heating energy, consumed using the average
flow and the heat coefficient.
Monthly values
At the end of each month, the monthly values are stored. A total of 18
monthly values of heat energy are volume are memorized in the
integrator.
Powered remote M-Bus
The powered remote M-Bus communication interface is a serial interface
which permits communication between different M-Bus devices via a
central M-Bus station.
The M-Bus protocol is compliant with standard EN1434-3.
By default, the primary address will be configured with the address 0
and the secondary address will correspond to the serial number of the
heat meter.
Technical data for the M-bus communication system:
M-Bus protocol compliant with standard EN 1434-3; free potential
interfacing without polarity (the voltage measured on the last device
must exceed 36VDC); transmission speed 300/2400 Baud; variable
data structure.
Type of cable recommended: telephone cable JYStY N*2*0.8 mm
2
.
integrator
Temperature sensors
Temperature sensor 2 wires Pt1’000
Diameter Ø 5.0; Ø 5.2, Ø 6.0 mm
Cables length 1.5 m
Admissible range 0...110 °C
Differential range 3...75 °C
Response limit 0.5 K
Temperature resolution (display) 0.1 K
Temperature resolution Δt 0.01 K
Measurement cycle for temperature from 10 seconds
Measurement cycle for flow
1)
1) the oscillating measurement principle and the differential pressure piezo sensor
ensures at any time that all pulses, ie, all volume is detected. In contrary to the
ultsasonic measuring principle, no scanning with a signal through the water is
necessary.
Permanently
Environment class
Environment class C
Mechanics M1
Electronics E1
Battery protection class III
Cable connection between flow sensor and
integrator
0.6 m, fix
Protection index IP 65
Permissible temperature
Operation 5...55 °C
Storage and transport -10...60 °C
Display
Display 8-digits LCD
Display units
Energy kWh, MWh, MJ, GJ
Volume m
3
Temperature °C
Δ temperature K
Power supply
Lithium battery 3V 6+1 or 12+1 years
Powered by M-Bus line 1 device = 2 M-Bus
charges
(max 2 x 1.5mA)
Table 27
Integrator pulse output option with accessary only
Pulse output
Open drain (MOS Transistor)
Vcc
max
: 35 V
DC
; ICC
max
: 25mA
1 Hz, 500 ms
Pulse inputs with a dry contact
Power supply internal 2.3 V
DC
R
pull UP internal
2 M Ω
Pulse factor 0...999.999 m
3
/Imp
or without unit
Table 28
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