WEBTEC FlowHUB Series User Manual page 14

Fluid viscosity
The performance of the FlowHUB can be affected by the
viscosity of the fluid measured. All units are designed to
meet the specification at a viscosity of 21cSt, which is a
typical kinematic viscosity for a hydraulic fluid operating at
50°C. The shaded area of the table shows the expected
range of viscosities that can be used by the FlowHUB
(models 30, 60, 120, 240 lpm & 8, 16, 32, 64 US gpm)
with minimal effect on the accuracy (less than ± 3%
FS). FlowHUBs can be specially calibrated at a different
viscosity or we can advise on the expected error when it
is used at other viscosities. For more detailed information
about viscosity changes and information on the 360 lpm or
100 US gpm models please contact Webtec.
Maintenance and service
There are no user serviceable parts inside the flow meter.
For calibration please return the flow meter to Webtec or
your local distributor.
Accessories
A range of adaptors, cables and remote displays are
available from Webtec or your local distributor. See the
contact on the back cover of this manual.
12
Reverse flow pressure drop
Pressure drop
Flow range
at 1/2 full flow
360 lpm (100 US gpm) 70 psi @ 180 lpm
240 lpm (64 US gpm) 40 psi @ 120 lpm
120 lpm (32 US gpm) 110 psi @ 60 lpm
60 lpm (16 US gpm) 30 psi @ 30 lpm
30 lpm (8 US gpm) 9 psi @ 15 lpm
All pressure drop measured with 1" adaptors fitted
Temp °C ISO15 ISO22
0 85.9 165.6
10 49.0 87.0
20 30.4 50.5
30 20.1 31.6
40 14.0 21.0
50 10.2 14.7
60 7.7 10.7
70 6.0 8.1
80 4.8 6.4
90 4.0 5.2
100 3.3 4.3
Pressure drop
at full flow
260 psi @ 360 lpm
130 psi @ 240 lpm
400 psi @ 120 lpm
90 psi @ 60 lpm
28 psi @ 30 lpm
Fluid type
ISO32 ISO37 ISO46 ISO68
309.3 449.9 527.6 894.3
150.8 204.7 244.9 393.3
82.2 105.5 127.9 196.1
48.8 59.8 73.1 107.7
31.0 36.6 44.9 63.9
20.8 23.9 29.4 40.5
14.7 16.5 20.2 27.2
10.9 12.0 14.6 19.2
8.4 9.1 11.1 14.3
6.6 7.2 8.7 11.1
5.5 6.0 7.1 8.9