hydrotechnik

Temperature sensors
SEG1050/SEG1060
Multi-EPC
Pressure sensors HT-PD
Multi-System5060/8050
Minimess and hose
flow sensor GFM/RE4
speed sensor DS 03

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.