KATflow 150
5 Commissioning
5.5
Input configuration
5.5.1
PT100 inputs
Wiring
Electrical
characterist-
ics
3 and 4 wire options.
Galvanically isolated from main electronics and from other I/O's.
Temperature: Range -50 ... 400 °C.
Resolution: 0.01 K.
Accuracy: ±0.1 K.
5.5.2
Analogue current input 0/4 ... 20 mA
Wiring
Electrical
characterist-
ics
Active (top) or passive (bottom) variants
Measuring range active = 0 ... 20 mA at 30 V
Measuring range passive = 4 ... 20 mA
Accuracy = 0.1 % of measured value
5.6
Heat quantity measurement (HQM) – [where installed]
If a heat quantity unit is specified for the Process Value, the KF100 will prompt the
user for the Specific Heat Capacity of the medium in J/g/K (for example 4.186 J/g/K
for water).
This may also be entered in the System\Calculation sub-menu.
The In/Output menu will then allow the user to select the temperature input source;
either PT100 temperature sensors or a fixed value for measurement against a
known inlet or outlet temperature. Where PT100 sensors are selected, the
flowmeter will prompt the user for a temperature offset, which may be useful where
the temperature of the medium differs from the temperature of the pipe wall (for
example with unlagged pipes). If a fixed value is selected, the meter will ask the
user to specify this value.
When heat quantity units are selected, these behave as any other Process Value
and may be totalized, or applied to a Process Output.
37
Inputs
