Sierra Instruments Instruction Manual
Smart-Trak
®
2 Series 100
35
Valve Position Screen (Mass Flow Controllers only)
Pushing the right arrow again takes you to the Valve Position Screen, if you have a
Mass Flow Controller. This screen will display the current state of the Smart-Trak 2
valve.
The state of the valve can be:
1.
Closed (Remember that the Smart-Trak 2 is not a positive shut-off device).
2.
Purge--Maximum Open (recommended 120% of the calibrated full scale
value, but can be much more and can be dangerous)
3.
Automatic (the normal position, where the controller responds to a setpoint
signal).
WARNING: The flow rate in Purge is much greater than the
calibrated full scale value and as a result can be dangerous.
For normal operation of the flow controller, this screen should display:
Valve
Automatic
Normal
If this is visible, the instrument will automatically control flow as soon as a setpoint
is given to it. If this screen displays Closed or Purge, the instrument has been
placed into an override position and it will not respond to any setpoint signal. The
valve state may be changed using the “Change Valve Operation” as described on
page 4-16.
Full Scale Screen
Pressing the right arrow again takes you to the Full Scale Screen. This screen
displays the current full scale value of the instrument with engineering units. It also
displays the gas. Note that this is not necessarily the factory calibrated full scale
value. The screen will display:
Full Scale
10.00
sl/m
Nitrogen
To change the full scale value, see the section below titled “Change Full Scale
Screen.” Pressing the right arrow again takes you back to the Mass Flow Screen.