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172-082010_400 I Series Software Page 19 of 35
sensor. The normalized sensor polynomial has the form of Y = Ax + Bx
3
+ Cx
5
. All of
the three coefficients will sum to 1.000.
This value is generated at the factory from specialized test data – changing this value
can corrupt the flow readings.
item 44:Sensor 5
th
Order Coefficient:
read S44(cr) or *[aa]S44(cr)
Sample reply: 0.023(cr)>
This is the coefficient of the 5th order term of the normalized polynomial used to
generate a linear relationship between the sensor output and mass flow through the
sensor. The normalized sensor polynomial has the form of Y = Ax + Bx
3
+ Cx
5
. All of
the three coefficients will sum to 1.000.
This value is generated at the factory from specialized test data – changing this value
can corrupt the flow readings.
Item 45:sensor 5 sccm span voltage
read S45(cr) or *[aa]S45(cr)
Sample reply: 0.5894 V(cr)>
This is the output voltage of the flow sensor when the 5 sccm nominal full scale sensor
flow is passing through it. This value is generated at the factory from specialized test
data – changing this value can corrupt the flow readings.
item 46:shunt factor:
read S46(cr) or *[aa]S46(cr)
Sample reply: 70(cr)>
write S46=50.0(cr) or *[aa]S46=50.0(cr)
This is the nominal full scale range of the laminar flow element (shunt) used to create
a pressure drop that will force flow through the mass flow sensor. The instrument full
scale value may be up to 50% above or below this value. Do not change this unless
the flow instrument is being re-ranged with a new shunt. Recalibration will be
required.
item 51:DAC zero code:
read S51(cr) or *[aa]S51(cr)
Sample reply: 8(cr)>
write S51=10(cr) or *[aa]S46=50(cr)
This is a positive integer value in the range of 0 – 4095 which is used to adjust the
analog output read the correct value when the instrument’s digital output is indicating
a zero flow.
item 52:DAC full scale code:
read S52(cr) or *[aa]S52(cr)
Sample reply: 3903(cr)>
write S52=4003(cr) or *[aa]S52=4003(cr)
This is a positive integer value in the range of 0 – 4095 which is used to adjust the
analog output read the correct full scale span value when the instrument’s digital
output is indicating a full scale flow rate.
item 54:comment
read S52(cr) or *[aa]S52(cr)