 |
GFM for high-temperature applications |
| hydrotechnik |
| High-temperature GFM data download |
| Advantages at a glance |
• high accuracy and repeatability
• operational pressure up to 630 bar
• fitting in any position and measuring in both flow
directions possible
• large measuring range up to 1:200
• application for a large viscosity range
• test points for pressure and temperature
• suitable for hydraulic- and other oils on mineral oil basis,
diesel oil, fats, glue, resins, waxes, pastes, polyurethane etc.
• option: detection of flow direction and pulse doubling |
Qualities of hydrotechnik gear flow meters type GFM |
| Measuring principle |
displacement |
| Viscosity range |
5 ... 500 mm²/s (cSt) |
| Medium temperature |
-20 ... +160 °C |
| Environmental temperature |
max. +50 °C (amplifi er) |
| Storage temperature |
-20 ... +85 °C |
| Output signal |
frequency |
| Supply voltage Ub |
12 ... 30VDC |
| Electrical measuring connector |
4 pole device connector, M12 x 1 |
| Protection type (EN 60529 / IEC 529) |
IP 64 |
| Tightening torque |
8 Nm (± 2 Nm) |
| Calibration viscosity |
30 mm²/s (cSt) |
| Material casing cover |
1.4305 |
| Material middle / bottom part |
0.7060 |
| Material sealings |
FKM |
| Material gear wheels |
1.7131 |
| Suitable measuring cable |
customer-specific |
|
| Pin assignment |
frequency |
 |
Pin 1 = + Ub |
| Pin 2 = signal |
| Pin 3 = – Ub / GND |
| Pin 4 = free |
|

|
Measuring
range |
Nonlinearity |
Geometric gear
volume |
Allowed working
pressure |
Impulses
per liter |
Hydraulic connector |
Error limit* |
| l/min |
of measured value |
cm³ |
bar |
MPa |
|
|
of current value |
| 0.2 ...30.0 |
± 0.5 % |
0.609 |
630 |
63 |
1,640 |
ISO 228-G3/8 |
± 0.5 % |
| 0.7 ...70.0 |
± 0.4 % |
2.222 |
420 |
42 |
450 |
ISO 228-G3/4 |
± 0.4 % |
|
Hydrotechnik Orders of type GFM: |
| Measuring range |
GFM系 |
Order number / weight |
| l/min |
|
QG 100 (frequency) |
| |
|
Order number |
weight |
| 0.2 ...30.0 |
GFM-30 |
3189-03-35.030 |
3,700 g |
| 0.7 ...70.0 |
GFM-70 |
3189-04-35.030 |
8,600 g |
|
*: for QG 100 and factory calibrated viscosity
**: casing material AlCuMgPb F37
***: for QG 110 additional ± 0.2 % of fi nal value (error of f/I-converter)
Factory standard calibration for mineral oil at 30 cSt. Other calibration viscosity optional. |