Flow Meter Application - INTEGRA Metering CALEC energy master Installation And Operating Instructions Manual

9.1.4

Flow meter application

As a flow meter/calculator, the signals from the flow sensors are converted into current values and
cumulative volumes. The measured liquid is also called a 'heat transfer medium' in this function,
although only the flow rate is measured.
A flow meter can be realised in each logical calculator. Up to three flow sensors can be connected
per device. The example below shows a flow meter application.
The volume of liquid and the current flow rate in two water pipes are transmitted via the M-Bus in-
terface to a billing system. The flow rate values are also transmitted as analogue signals to a build-
ing services management control system.
The following table summarises the input and output signals:
Signal transmitter Signal
Water meter 1 Pulse
Water meter 2 Pulse
This produces the following application diagram:
Mod.-Typ Mod.-Typ Supply Supply
Mod.-Nr. Mod.-Nr. 5... 6 5... 6
Sign.-Typ Sign.-Typ
Sign.-Nr. Sign.-Nr.
230 VAC 230 VAC
This example can be implemented with one device, using calculators 1 and 2, which are both con-
figured as flow meters.
Meter readings
The device records the following meter readings.
Calculator 1
V Cumulative volume flow
20
Physical variable
Volume flow: 1: Qv
Volume flow: 2: Qv
M-Bus M-Bus Output Output Input Input
4 4 3 3 2 2
Output Output Input Input
2 2 1 1 2 2
M-Bus M-Bus Q1 Q1 1: Qv 1: Qv
Q2 Q2
2: Qv 2: Qv
CALEC
Output control system
4 ... 20 mA
4 ... 20 mA
CPU 2 x Pt100 CPU 2 x Pt100
1 1
1 1
Calculator 2
2: V Cumulative volume flow
®
energy master installation and operating instructions
Billing system
M-Bus
M-Bus