Lincoln Electric IM10077 POWER FEED 25M - Manual (Page 60)

B-44 OPERATION B-44
FLOW METER
The flowmeter shows the flow rate of shielding gas
and has a valve to adjust the flow. The flow meter is
scaled for CO
2 , Ar, and CO 2 /Ar blends. It is not cali-
brated and is for reference purposes only. The middle
of the ball indicates the flow rate of shielding gas.
Adjust the flow rate while depressing the GAS
PURGE switch by turning the valve at the bottom of
the meter. Most weld procedures require 25-40 scfh
(11.8 - 18.9 lpm) for sufficient shielding gas coverage.
Gun angle, nozzle diameter, joint configuration and
wind conditions may effect the amount of shielding
gas required.
When using a wire feeder with a flow meter, adjust the
regulator at the shield gas bottle or supply to a flow
rate that is higher than the flow rate indicated on the
feeder flow meter. Note that most regulators are cali-
brated based upon having low restrictions on the out-
let. The valve on the feeder flow meter creates a high
restriction and may cause errors in the readings at the
supply regulator. Set the gas flow rate using the
feeder flow meter reading and not the supply regulator
reading.
To achieve maximum flow rate, use a regulator with
30 psi or higher pressure compensation.
SCFH Liter/Min.
10 4.7
20 9.4
30 14.2
40 18.9
50 23.6
60 28.3
70 33.1
80 37.8
POWER FEED™ 25M
Ball
Valve