Sierra Instruments Instruction Manual
Smart-Trak
®
2 Series 100
60
In this normal operating position, the valve is ready to control flow when it receives
a setpoint from some source. Using this box, you may set the valve to open well
beyond its normal maximum position (“Purge”) or force the valve to remain shut
regardless of setpoint (“Closed”). Use the pull down menu to make this change.
Choose “purge” to fully open the valve regardless of the given setpoint or choose
“closed” to override any setpoint command and close the valve.
CAUTION: Do not activate the valve state pull-down menus unless you are
ready to make this change.
Once in the pull-down menu, if you click on one of
the selections, the valve operation will change immediately. Remember that
the Smart-Trak 2 is not a positive shut-off device.
Change Gas (Dial-A-Gas
TM
)
This box will display the current gas selection. If you wish to change the gas used
in the instrument, activate the pull-down menu. The 10 gases programmed into the
memory of your Smart-Trak 2 will be displayed.
Choose the correct gas for your current application and click. The new gas
selection will appear in the box. Within a few seconds, the new gas selection will
also appear in the yellow Flow box and the values of the mass flow, setpoint and the
full scale will be adjusted for this new gas. This is normal. In some cases, where
the thermal properties of one gas are very similar to another, these values may not
change very much.