Electronic Flow Sensing
Two channels of electronic flow rate sensing continuously monitor gas flow rates (usually carrier) in the HP 5890 SERIES II. Proper scaling of displayed values for different commonly used gases is defined through keyboard entries. The two flow channels are distinguished through 
A 
and 
B 
.
If carrier gas flows are monitored, A implies flow through column A (nearest the instrument front); B implies flow through column B (nearest the instrument rear).
Displayed flow rate values are in ml/minute.
Displaying gas flow rate
Current flow rate is displayed by pressing:
FLOW 
A 
( or 
B 
)
Typical gas flow rate displays are shown in Figure 4•1:
Figure
ACTUAL SETPOINT
FLOW A | 25.4 N2 |
|
|
ACTUAL SETPOINT
NO FLOW SENSOR
Typical Electronic Flow Rate Sensor Displays
58