Flow Tracker Series 1000/2000
Reference Manual
15
pressure (PSIG = the reading obtained by a pressure gauge that
reads zero at atmospheric pressure) by simply subtracting local
atmospheric pressure from the absolute pressure reading:
PSIG = PSIA – (Local Atmospheric Pressure)
The flowmeters use the absolute pressure of the gas in the
calculation of the mass flow rate.
Gas temperature
The Flow Tracker Series flowmeters use a temperature sensor
to measure the line temperature of the gas flow being
monitored. The temperature is displayed in engineering units of
degrees Celsius (°C). The flowmeters use the temperature of the
gas in the calculation of the mass flow rate. This parameter is
located in the upper middle portion of the display under the
dynamic label “°C”.
Volumetric flow rate
The volumetric flow rate is determined as described in the
Measurement Operating Principle
section. The engineering unit
associated with the volumetric flow rate is milliliters per
minute (mL/min). This parameter is located in the lower left
corner of the display over the dynamic label “Vol”. In order to
get an accurate volumetric flow rate, the gas being measured
must be selected (see
). This is important because the
device calculates the flow rate based on the viscosity of the gas
at the measured temperature. If the gas being measured is not
what is selected, an incorrect value for the viscosity of the gas
will be used in the calculation of flow, and the resulting output
will be inaccurate in direct proportion to the difference in the
two gases’ viscosities.
N O T E
For working in metric units, note that 1 PSI = 6.89 kPa.
