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172-082010_400 I Series Software Page 24 of 35
This is the coefficient of the 2nd order term of the normalized polynomial used to
generate a linear relationship between the volumetric flow through the sensor and
volumetric flow through the laminar flow element (shunt). The normalized sensor
polynomial has the form of Y = Ax + Bx
2
+ Cx
4
. All of the three coefficients will sum to
1.000.
This value is generated at the factory from test data – changing this value will affect
the calibration of the instrument. Do not change this unless a normalized linearity
calculation was performed beforehand.
item 11: 4th order shunt factor:
read G11(cr) or *[aa]G11(cr)
Sample reply: 0.01(cr)>
write G10=0.0005(cr) or *[aa]G10= 0.0005(cr)
This is the coefficient of the 4th order term of the normalized polynomial used to
generate a linear relationship between the volumetric flow through the sensor and
volumetric flow through the laminar flow element (shunt). The normalized sensor
polynomial has the form of Y = Ax + Bx
2
+ Cx
4
. All of the three coefficients will sum to
1.000.
This value is generated at the factory from test data – changing this value will affect
the calibration of the instrument. Do not change this unless a normalized linearity
calculation was performed beforehand.
item 12: comment:
read G12(cr) or *[aa]G12(cr)
Sample reply: Gas0(cr)>
write G12=Fuel(cr) or *[aa]G12= Fuel(cr)
This is space reserved for the customer. This could be used to provide a text message
to identify this particular gas calibration for users. This is only a text identifier and
does not affect the calibration. Any identifier that is 9 characters or less may be used.
item 13: cal date:
read G13(cr) or *[aa]G13(cr)
Sample reply: 01/01/0000(cr)>
write G12= 01/01/2006(cr) or *[aa]G12= 01/01/2006(cr)
This is the date that this gas record was last calibrated for this particular instrument.
The format is day-month-year.
item 14: span correction factor:
read G14(cr) or *[aa]G14(cr)
Sample reply: 1.000(cr)>
write G14= 1.001(cr) or *[aa]G14= 1.001(cr)
This is the value that is adjusted at calibration time to correct for differences in the
indicated full scale flow value and the flow values reported by the flow reference.
Changing this value will affect the calibration of the instrument; do not change unless a
flow reference is available to verify the calibration.
item 15: volumetric unit:
read G15(cr) or *[aa]G15(cr)
Sample reply: 1(cr)>