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Instruction for use | Supercal 5
Its flow rate is determined with a suitable flow sensor.
A pair of temperature sensors determine the “warm pipe temperature” and the
“cold pipe temperature” of the heat transfer medium. When ΔT > 0,2 K, the energy con
-
sumed is calculated.
The cooling energy is calculated when ΔT < 0,2 K and the “cold pipe temperature”
< 18 °C. This threshold value can be set on demand.
11.4 Arithmetic Logic Unit
Modern calculators should be able to meet a large number of user related and technical
requirements, such as:
Good readability of the arithmetic unit displays
Logical and clear menu structure
Servicability
Low costs when changing meters
Flexibility with regard to use of different flow and temperature sensors
Modularity over equipment with device options such as data inputs and outputs, etc.
Highest measurement accuracy and data security
In general, each calculator should be clearly assigned to a heat measuring point and
easily accessible/readable.
Electromagnetic interference and overheating at the installation site must be avoided at all
costs. All cables must be laid at a minimum distance of 300 mm from power and high-fre-
quency cables.
11.5 Flow Sensors
The following common types of flow sensor can be used:
Vibrating jet flow sensors
Wing and turbine wheel meters
Magnetic-inductive flow sensors
Ultrasonic flow sensors
The following criteria can influence the selection of the flow sensor:
Type of measurement (heat/cold measuring point, viscosity of the medium, etc.)
Installation requirements
Accuracy requirements for the flow sensor
Available inlet/outlet distances (measuring accuracy)
Price/performance
In order to achieve the highest possible resolution, the pulse factor (pulses per unit
volume) should always be high.
The installation location of the flow sensor (“cold side” or “warm side”) is just as important,
because the conversion from the volume passing through to the mass passing through takes
place at the temperature assigned to the installation location.
As a rule, the flow sensor is installed where the ambient temperature is closest to room
temperature.
This results in a higher measurement accuracy and a longer service life of the flow sensor.
11.6 Flow Measurement
Type-approved flow sensors with a pulse or frequency output can be connected to the
Supercal 5 .
The calculator has the following input pulse values:
Up to 999,999 pulses/litre
Up to 999,999 litres/pulse
Summary of Contents for Supercal 5 I
Page 1: ...Instructions for Use Supercal 5 I...
Page 6: ...6 Instruction for use Supercal 5...
Page 55: ...55 Instruction for use Supercal 5 The interfaces of the NOWA adapter...
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