Basic Operation - WEBTEC GF Serie Manual Del Usuario

Basic operation

Gear flow meters are positive displacement devices, similar in design to a gear pump. The measuring medium rotates
two gears, which are engaged with minimum play and tight tolerances. The medium is forced through closed measuring
chambers between gears and housing which causes the rotation. The gears run free on precision bearings and present
little resistance to the fluid. The r.p.m. of the gears is proportional to the instantaneous flow rate. The gear flow meters
are fitted with pickups which will precisely detect the r.p.m. through the body of the meter without contact with the
fluid. The numbers of pulses is counted and this is converted into a 4-20mA or pulse signal proportional to the flow.
All flow meters are calibrated at 21 cSt as standard. Special calibration is available over a custom flow range or at a
different viscosity, please contact sales to discuss your application.
Specification
Model number
GF025-MAP-B-6
GF025-MAP-S-6
GF070-MAP-B-6
GF070-MAP-S-6
GF150-MAP-B-6
GF150-MAP-S-6
Note: GF series flow meters with CAN output for use with Webtec HPM data loggers are also available, please contact Sales.
Functional specification
Ambient temperature:
Fluid type:
Fluid Viscosity:
Fluid temperature:
Accuracy, analogue signal:
Frequency signal:
Calibration resolution:
Repeatability:
Degree of protection*:
Installation requirements:
2
Male Fitting
1/2" BSPP
3/4" -16UN JIC Male
3/4" BSPP
1-1/16" -16UN JIC Male
3/4" BSPP
1-1/16" -16UN JIC Male
5 to 40 °C (41 - 104 °F)
Oils, fuels, water glycol, water oil emulsions, phosphate esters
1 to 10000 cSt (calibrated at 21 cSt. NB. Pressure drop may reach unacceptable levels with
high viscosity fluids. Contact sales regarding calibration on fluids below 15 cSt.)
- 40 to 120 °C (41 - 194 °F) continuous use.
15 to 100% of range: 0.5% of indicated reading
Below 15% fixed accuracy of 0.5% of 15% of full scale.
0.5% of indicated reading
7 points as standard, up to 20 points optional - please contact sales
Better than ± 0.1%
IP65 (EN60529) *With cable connected
Clamp hoses close to meter. It is recommended that a min. 50 micron filter is installed in the
circuit prior to the flow block.
Flow range Pressure
0.1 to 25 lpm 420 bar
0.03 to 7 US gpm 6000 psi
0.5 to 70 lpm 420 bar
0.15 to 19 US gpm 6000 psi
5 to 150 lpm 420 bar
1.3 to 40 US gpm 6000 psi