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172-082010_400 I Series Software Page 23 of 35
This used to identify the gas for which this record is calibrated. This is only a text
identifier and does not affect the calibration. Any identifier that is 9 characters or less
may be used for gas identification.
item 5: time factor:
read G5(cr) or *[aa]G5(cr)
Sample reply: 1.00(cr)>
write G5=60.0(cr) or *[aa]G3= 60.0(cr)
This is the number of minutes in the time unit of the desired flow unit. When the flow
unit is given as an amount per hour this will be 60 (scfh), if the flow unit is given as an
amount per second this unit will be 1/60 = 0.01667 (gm/sec). Changing this value will
affect the calibration.
item 6: units conversion factor:
Reserved for future use
item 7: units symb:
read G7(cr) or *[aa]G7(cr)
Sample reply: SLM(cr)>
write G7=SCFH(cr) or *[aa]G6= SCFH(cr)
This used to identify the flow unit for which this record is calibrated. This is only a
text identifier and does not affect the calibration. Any identifier that is 9 characters
or less may be used for engineering unit identification.
item 8: volume factor:
read G8(cr) or *[aa]G8(cr)
Sample reply: 1.00(cr)>
write G8=1000.0(cr) or *[aa]G8= 1000(cr)
This is the ratio between the amount of gas that is contained in a standard liter vs the
amount of gas that is contained in the current amount unit. As an example, this would
be 1000 if the current flow unit was a standard cm
3
since there are 1000 standard cm
3
in a standard liter. If a direct mass unit is being employed, this will be the gas density.
Changing this value will affect the calibration.
item 9: gas corr factor:
read G9(cr) or *[aa]G9(cr)
Sample reply: 1.00(cr)>
write G9=1.43.0(cr) or *[aa]G9= 1.43(cr)
This is a value that is used to correct for the differing specific heat dependent sensor
sensitivities for different gases. This will be 1.00 for Nitrogen but it will vary when the
flow instrument is calibrated for gases that are complex molecules or the noble gases.
This value will be listed for each gas in the gas conversion factor table for this
instrument.
item 10: 2nd order shunt factor:
read G10(cr) or *[aa]G10(cr)
Sample reply: 0.04(cr)>
write G10=0.005(cr) or *[aa]G10= 0.005(cr)