Flow Calibration
FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG
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After calibration and adjustment, the FLOWSIC600 must be set to one of the following
operating pressure ranges by setting the "Pressure(fixed)" parameter (Reg. #7041
).
3.2.2.2
Flow calibration at high pressure (p
e
, max > 4 bar(g))
If the maximum permitted operating pressure of a gas flow meter is > 4 bar(g), 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). The FLOWSIC600 should be tested under the same conditions and using the
same type of gas to be used during normal operation.
Determining the test pressure
Prior to the verification procedure, the parameter "Pressure(fixed)" must be set to the
average pressure applied during testing. If the final operating pressure exceeds 50 bar,
testing at 50 bar will be sufficient.
The maximum ratio of minimum and maximum operating pressure is:
Generally,
where
p
e, min
= 0.5 * p
fix
p
e, max
= 2 * p
fix
if p
fix
0.5 PS; otherwise PS
The corresponding operating pressure range is displayed on the FLOWSIC600 as
calculated in accordance with these equations.
The test pressure which comes closest to the average at the application working pressure
shall be entered as the "Pressure(fixed)" parameter. The meter shall then be adjusted with
the weighted mean error established at this test pressure.
Pressure(fixed)
Rated pressure range
p
e, min
p
e, max
1 bar(a) (14.5 psi)
0 bar(g)
0 psi
0.1 bar(g)
1.4 psi
1.5 bar(a) (21.7 psi)
>0.1 bar(g) 1.4 psi
1.0 bar(g)
14.5 psi
3.2 bar(a) (46.4 psi)
>1.0 bar(g) 14.5 psi
4.0 bar(g)
58.0 psi
WARNING:
The maximum permitted operating pressure of a gas flow meter calibrated at
atmospheric pressure must not exceed 4 bar(g).
Enter the absolute pressure value of the average working pressure when
setting the "Pressure(fixed)" parameter.
p
e, max
p
e, min
=
4
p
fix
= p
e, min *
p
e, max
+ 1 bar
