FastFlo™ 620S Instruction Manual
Chapter 3 Operation
IM-62S
3-9
Note: when adjusting zero the current signal will be driven to 4 mA and when ad-
justing span the current signal will be driven to 20 mA. We recommend recording
the current values before making any changes to the current zero or span set-
tings.
Current Zero Adjustment
If needed, use Zero mA (Function 3) to adjust the 4-20 mA output to 4.0
mA
.
1. Disconnect the 4-20 mA (+) loop wire. Set the DVM to current mode
and connect the positive lead to the wire you just disconnected.
Connect the negative lead to the 4-20 mA (–) on the flow meter ter-
minal block.
2. Press FUNCTION, enter the password (if so equipped). Press
FUNCTION until
Zero mA
appears on the LCD display or a solid “3” ap-
pears on the LED. Adjust the UP or DOWN button until the DVM indi-
cates between 3.95 and 4.05 mA. Set DVM back to voltage mode when
adjustment is complete.
3. After 12 seconds of non-activity, the meter returns to the Run Mode
and the new parameter is in effect.
Current Span Adjustment
If needed, use Span mA (Function 4) to adjust the 4-20 mA output to
20.0 mA.
1. Disconnect the 4-20 mA (+) loop wire. Set the DVM to current mode
and connect the positive lead to the wire you just disconnected.
Connect the negative lead to 4-20 (–) on the flow meter terminal
block.
2. Press FUNCTION, enter the password (if so equipped). Press
FUNCTION until
Span mA
appears on the LCD display or a solid “4”
appears on the LED. Adjust the UP or DOWN button until the DVM in-
dicates between 19.95 and 20.05 mA. Set DVM back to voltage mode
when adjustment is complete.
3. After 12 seconds of non-activity, the meter returns to the Run Mode
and the new parameter is in effect.
Caution!
Adjusting zero or span
will affect meter cali-
bration.
