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Instruction for use | Supercal 5
11.7 Flow Calculation
A flow calculation is based on recorded time between impulses that have been triggered
by the flow sensor.
For the first flow calculation, the calculator basically requires two volume pulses for the
calculation of the effective flow. Depending on the configuration, the internal flow rate
calculation and the immediate display of the current flow rate on the LCD display take
place.
Configuration
The frequency of a flow calculation depends on:
The number of volume pulses arriving in a predetermined time interval
(minimum/maximum waiting time).
The desired accuracy of t he flow calculation
The corresponding parameters for the flow calculation are defined in the
factory and can only be changed by authorised test centres.
11.7.1 Calculation of the Flow Rate with Conventional Flow Sensors
With conventional flow sensors, such as mechanical flow sensors, the pulse value is given
in
litres/pulse
or the time for a measuring period in seconds.
The formula for the current flow rate in liters per hour is then:
11.7.2 Calculation of the Flow Rate with Fast Flow Sensors
For fast flow sensors, the pulse valency is specified in
pulse/litre.
The formula applies accordingly:
11.8 Temperature Measurement
11.8.1 General Information
The basic measuring range of the calculator is – 20°C to + 200°C.
Approved according to MID, the measuring range is 2°C to 200°C. There is no approval below
2°C according to today’s valid approval regulations.
As standard, the Supercal 5 is designed for Pt500 temperature sensors. The temperature
sensors can be connected using two-wire or four-wire technology. The temperature meas-
urement itself is carried out according to the “dual slope method”. An integrated calibration
system ensures high measurement resolution and measurement stability.
If the equipment is connected to a 440, the measure timing is:
Between 3 seconds and 30 seconds in the case the calculator
has an external power supply.
Between 10 seconds and 30 seconds in the case the calculator
has not an external power supply.
In case, an other flow sensor is usued:
Between 3 seconds and 120 seconds in the case the calculator
has an external power supply.
Between 10 seconds and 120 seconds in the case the calculator
has not an external power supply.
Flow rate (l/h)
3,600/time × Pulse/pf
pf (pulse/litre)
pulse factor
Pulse
number of pulses per measuring period
Time
duration of the measuring period [s].
Flow rate (l/h)
kw × 3,600 × imp/time
kw (litre/pulse)
pulse valence
Imp
number of pulses per measuring period
Time
duration of the measuring period [s].
