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172-082010_400 I Series Software Page 18 of 35
be set in the warning status word. This item configures or reports the limit in the flow
units chosen in the gas record (G7). Writing to this item will affect the value reported
back by S35 below.
item 35:Low warn limit: (% of full scale)
read S35(cr) or *[aa]S35(cr)
Sample reply: 10.00 %(cr)>
write S35=10.0(cr) or *[aa]S35=10.0(cr)
If the flow warning enable is set (S9) and the flow remains below this limit for longer
than the time specified by the flow warning delay (S10) the low flow warning bit will
be set in the warning status word. This item configures or reports the limit as a % of
the full scale flow value listed in the active gas record (G2). Writing to this item will
affect the value reported back by S34 above.
item 36:integrated flow:
read S36(cr) or *[aa]S36(cr)
Sample reply: 12456 SL(cr)>
write S36=0.0(cr) or *[aa]S36=0.0(cr)
This is the amount of gas that has passed through the flow instrument since the last
time that this value was reset. Reset this value by sending a “S36=0” command. This
value is useful for measuring the total flow that used during a process or to fill a
container with a specified amount of gas.
item 40:Sensor Voltage: (read only)
read S40(cr) or *[aa]S40(cr)
Sample reply: 0.4356 V(cr)>
This is the current flow sensor output voltage.
This value will typically be between -0.3 to +1.0 volts. Values outside of this range
denote a failed flow sensor or excessive flow through the sensor.
item 41:Sensor Serial Number:
read S41(cr) or *[aa]S41(cr)
Sample reply: 1024500001(cr)>
This is the serial number given to the flow sensor after it was manufactured and
tested. Do not change this.
item 42:Sensor Linear Coefficient: (read only)
read S42(cr) or *[aa]S42(cr)
Sample reply: 0.921(cr)>
This is the coefficient of the 1st order term of the normalized polynomial used to
generate a linear relationship between the sensor output and mass flow through the
sensor. This coefficient is calculated from the other two higher order coefficients.
The normalized sensor polynomial has the form of Y = Ax + Bx
3
+ Cx
5
. All of the three
coefficients will sum to 1.000.
item 43:Sensor 3
rd
Order Coefficient:
read S43(cr) or *[aa]S43(cr)
Sample reply: 0.054(cr)>
This is the coefficient of the 3rd order term of the normalized polynomial used to
generate a linear relationship between the sensor output and mass flow through the