Graco G250HR User Manual

1.

Shut off the fluid supply to the meter. 

2.

Shut off all electrical power to the fluid system.

3.

Follow the Pressure Relief Procedure for your fluid 
system dispensing device.

This is a positive displacement, gear flow meter. The 
gear flow meter is highly accurate, even with low flow 
rates. The fluid flowing through the meter rotates the 
gears. The gear tooth is picked up by a sensor device, 
which produces an impulse for every gear tooth passing 
by.

•

See the Technical Data for fluid and ambient tem-
perature limits.

•

Only use the flow meter with fluids that are compati-
ble with the “Wetted Parts” listed in the Technical 
Data.

The G3000 and G250 meters flow volume range is 
0.02-1.0 gal./min. (75-3800 cc/min.).

The G3000HR and G250HR meters flow volume range 
is 0.01-0.5 gal./min. (38-1900 cc/min.).

1.

To check the accuracy of the meter, turn your gun 
fan and atomizing air off, then trigger the fluid into a 
graduated cylinder; dispense at least 500 cc of fluid.

2.

Measure the volume of fluid in the beaker in 
cubic-centimeters (cc) and read the volume on the 
flow meter monitor.

G3000 and G250: If the flow meter scale factor is 
not between 0.112-0.140 cc/pulse, follow the clean-
ing procedure on page 10, then recalibrate the flow 
meter.

G3000HR and G250HR: If the flow meter scale fac-
tor is not between 0.05-0.07 cc/pulse, follow the 
cleaning procedure on page 10, then recalibrate the 
flow meter.

Do not exceed the maximum working pressure of your 
meter or any component or accessory in your system.

The flow meter gears and bearings can be damaged 
if they rotate at too high a speed. To avoid high speed 
rotation, open the fluid valve gradually. Do not 
over-speed the meter with air or solvent. To prolong 
meter life, do not exceed the meter’s maximum flow 
rate.