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4
Specification
Dimensions and Weight
Model Height
Width
Depth
Weight
4278
9.45
”
(240 mm)
7.87
”
(200 mm)
7.87
”
(200 mm)
14.33 lbs (6.5 kg)
* per J518 SAE Code 61 standard
Model Number
Flow Range
Pressure Range
Inlet/Outlet Ports
4278
2.5 - 100 gpm
0 - 6000 psi
1-5/16
”
-12UN #16 SAE ORB
(10 - 400 lpm)
(0 - 420 bar)
Ambient temperature
:
41 - 104°F (5 to 40°C)
Fluid type
:
Hydraulic oil
Fluid temperature
:
32 - 250°F (0 to 120°C)
Flow
Accuracy:
± 1% of full scale.
Pressure
Accuracy:
± 1.6% of full scale.
Temperature Accuracy:
± 2°F, 1°C.
Construction materials
Case
:
Painted mild steel
Flow block
:
High tensile aluminum
Seals
:
FKM
Battery Details
PP3 9 volt Alkaline (IEC6LR61, ANSI/NEDA 1604A)
Fluid type
Temp °C
ISO15
ISO22
ISO32
ISO37
ISO46
ISO68
0
85.9
165.6
309.3
449.9
527.6
894.3
10
49.0
87.0
150.8
204.7
244.9
393.3
20
30.4
50.5
82.2
105.5
127.9
196.1
30
20.1
31.6
48.8
59.8
73.1
107.7
40
14.0
21.0
31.0
36.6
44.9
63.9
50
10.2
14.7
20.8
23.9
29.4
40.5
60
7.7
10.7
14.7
16.5
20.2
27.2
70
6.0
8.1
10.9
12.0
14.6
19.2
80
4.8
6.4
8.4
9.1
11.1
14.3
90
4.0
5.2
6.6
7.2
8.7
11.1
100
3.3
4.3
5.5
6.0
7.1
8.9
Table showing kinematic viscosity (cSt) of different mineral oils at specific temperatures
ISO 15, 22, 32, 46 and 68 based on typical figures for the Esso Nuto range of
HM oils. ISO 37 based on Shell Tellus HM oil.
Fluid viscosity
The performance of a turbine flow meter can be affected by the viscosity of the fluid measured.
Our turbine flow meters are calibrated at between 18 and 26 cSt as standard (a mean viscosity
of 21 cSt), which is the typical kinematic viscosity for a hydraulic fluid operating at 50 °C. The
kinematic viscosity of all hydraulic fluids is related to the fluid temperature and the table below
shows the affect of temperature on the kinematic viscosity of a range of typical grades of
hydraulic oil.
The shaded area of the table shows the range of viscosities that can be measured by a flow
meter with standard calibration with minimal effect on the accuracy (less that ± 1% FS).
Flow meters can be specially calibrated at a different viscosity to the standard or we can advise
on the expected error when the flow meter is used at other viscosities, please contact sales
for further information.
