Specifications

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3BUS 208 000 R1301118 Measurement Setup
Table 6-14 Flow Versus Current with the Heater Fully On
8. Jog the head package to the coldest location, probably off–sheet, for at least
one hour. Verify that the source and detector heater duty cycle is less than 90%.
See Figure 6-3 on page 116 for detector heater and source heater duty cycles.
9. Locate the head package in the hottest location for one hour. Verify that the
source and detector heater duty cycle is greater than 5%.
10. If Step 8. or Step 9. fail, then repeat Step 4. and Step 6. to obtain reasonable
operation. Increasing air flow or control set point will increase duty cycle;
lowering air flow or control set point will reduce the duty cycle.
Note: When the sensors are cold, allow 20 minutes before control begins
to operate. One hour is required before the sensorsare stable
enough for measurement or before duty cycleevaluation.
The Basis Weight detector sensor has a longer thermal time
constant. It will take longer for it to come into control.
PTC Heater Character at 30°C Input Air
Amperes scfm
1.4 2.2
1.8 3.7
2.6 5.7
3.6 8.7
3.7 9.8
Flow ≈ Amps * 2.8 - 1.8