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Fluid viscosity
The performance of the FlowHUB can be affected by the viscosity
of the fluid measured. FlowHUB is calibrated at a mean viscosity
of 21cSt using ISO32 hydraulic mineral oil to ISO11158 category
HM. The shaded area of the table shows the expected range of
viscosities that can be used by 'Switch', 'Transmiter' and 'Ultimate'
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. FlowHUB
ViscoCorrect will automatically adjust the flow reading over the
viscosity range of 1 to 85 cSt. If the viscosity is stable and at the
calibration value (standard calibration is at 21 cSt) then the accuracy
is improved to +/- 3% of full scale.
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.
Calibration
Recommended period between calibrations is 12 months.
Maximum period between calibrations is 36 months. Unit accuracy
may be affected by operating cycle, fluid condition or extended
periods between recalibrations.
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
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