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FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG
Flow Calibration
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3.2.2
Operating pressure ranges
The minimum (p
e, min
) and maximum (p
e, max
) operating pressure must be representative of
the operating pressure range.
The permitted operating pressure range of the meter is derived from the "Pressure(fixed)"
parameter (Reg. #7041 "Pressure(fixed)").
3.2.2.1
Flow calibration at atmospheric pressure (p
e
, max < 4 bar(g))
If the maximum permitted operating pressure of a gas flow meter is < 4 bar, the flow
calibration should be performed according to the specification "Flow Calibration
Procedures, Ultrasonic Gas Flow Meter FLOWSIC600" (see product CD, document number:
E_18475).
For a further increase in the measuring accuracy, the FLOWSIC600 provides Reynolds-
number and velocity-related impact correction routines. These parameters, dependent on
nominal size, are determined prior to the verification procedure and set as constants by
the manufacturer. The Reynolds number range can be set using the "Pressure(fixed)"
parameter (Reg. #7041).
For calibration with air at atmospheric pressure, switch the meter to "Air test" mode.
Connect to the FLOWSIC600 with MEPAFLOW600 CBM (
)
Open the "Calibration wizard" (select Tools / Meter Calibration)
Switch the meter to "Configuration Mode".
Activate the check box "Ambient air flow test".
Click "Write to meter".
WARNING:
The maximum operating pressure must not exceed the maximum pressure
rating (Design Pressure PS) of the meter body.
The maximum permitted operating pressure (design pressure) is specified as
"PS" on the type plate of the meter body (
Table 16
Pressure parameters
Variable
Reg. name
Description
p
fix
Reg. #7041 "Pressure(fixed)"
Absolute pressure value of the average
working pressure
p
e, min
Reg. #7700 "pe.min"
Minimum operating pressure
p
e, max
Reg. #7701 "pe.max"
Maximum operating pressure
"Air test" mode
The "Air test" mode sets the "Pressure(fixed)" parameter value internally to 1
bar. The meter then operates with the low pressure Reynolds numbers (low
pressure curve). The words "Ambient Air Test Mode active" will appear in the
status bar while the device is being calibrated.
Low frequency pulse rate during air test
If a high-pressure calibrated meter is to be tested under atmospheric pressure,
a special low frequency pulse rate may be required. This can be specified as an
alternative meter factor which is used during the air test only (Reg. #7060
"MeterFactorLF").
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