Hydrotechnik overview of GFM Gear volume flow sensor
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GFM Gear volume flow sensor |
| hydrotechnik in china | |
| GFM Gear volume flow sensor data download | |
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Hydrotechnik gear flow meters type GFM for measuring of the volume flow rate |
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For the measuring of the volume flow rate, pulses are evaluated as a volume per time in any flow unit whatever, e.g. l/min. |
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Hydrotechnik gear flow meters type GFM for counting of the volume (quantity) |
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| For the counting of the volume, individual pulses per gear tooth volume are added up in the instrument and are shown in freely selectable volume units. |
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Advantages at a glance |
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| • 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 |
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Short description of measuring principle |
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| A ball bearing pair of gear wheels is moved by the streaming fluid. The fluid is transported in the cavities between each gear tooth and the housing.This measuring system works accordingly to the positive displacement principle. Due to this, the measuring accuracy is largely independent of the fluid viscosity. The rotation of the gear wheels is detected by a non-contacting magnetoresistor sensor. Each tooth cuts through a small magnetic field and produces a square wave electrical output. The connected HYDROTECHNIK measuring instruments display the volume flow rate in any flow unit whatever (e.g. l/min.). As an option it is possible to realize a doubling of the pulses, when installing an additional magnetoresistor sensor into the gear flow meter. In doing so, a better resolution is achieved and modifications of the direction are detected exactly. |
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Hydrotechnik Technical data of GFM Gear volume flow sensor
Qualities of hydrotechnik gear flow meters type GFM |
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| Measuring principle | displacement |
| Viscosity range | 5 ... 500 mm²/s (cSt) |
| Medium temperature | -20 ... +120 °C |
| Environmental temperature | max. +80 °C |
| Storage temperature | -20 ... +85 °C |
| Output signal | frequency (rectangle) / 4 ... 20 mA |
| Supply voltage Ub | 12 ... 24 VDC |
| Electrical measuring connector | 5 pole device connector, M16 x 0.75 |
| Protection type (EN 60529 / IEC 529) | IP 40 |
| Tightening torque | < 0.5 Nm, thread pin (clamping piece) T 3362000 |
| 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 | MK 01 |
| 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 | ||
| 0.05...5.0 (GFM-5) |
± 0.5 % | 0.191 | 630 | 63 | 5,250 | ISO 228-G¼ | ± 0.5 % |
| 0.2 ...30.0** (GFM-30) |
0.609 | 160 | 16 | 1,640 | ISO 228-G3/8 | ||
| 0.2 ...30.0 (GFM-30) |
630 | 63 | |||||
| 0.7 ...70.0 (GFM-70) |
± 0.4 % | 2.222 | 420 | 42 | 450 | ISO 228-G3/4 | ± 0.4 % |
| 3 ...300 (GFM-300) |
± 0.5 % | 8.750 | 100 | SAE-Flansch 1¼ | ± 0.5 % | ||
Hydrotechnik Electrical connection of GFM Gear volume flow sensor
| Pin assignment | QG 100 (frequency) | QG 110 (4 ... 20 mA) |
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Pin 1 = signal + | Pin 1 = signal + |
| Pin 2 = – Ub / signal – / GND | Pin 2 = signal – / GND | |
| Pin 3 = + Ub | Pin 3 = + Ub | |
| Pin 4 = free | Pin 4 = free | |
| Pin 5 = free | Pin 5 = free |
Hydrotechnik Dimensions of GFM Gear volume flow sensor
Hydrotechnik order numberof GFM Gear volume flow sensor
| Measuring range | GFM | Order number / weight | ||||
| l/min | QG 100 (frequency) | QG 110 (4 ... 20 mA) | ||||
| Order number | detection of direction | weight | Order number | weight | ||
| 0.05...5.0 | GFM-5 | 3143-02-35.030 |
3146-02-35.030 3146-02-35.00 3146-02-35.042 3146-02-35.046 3146-02-35.99 |
3,000 g | 3185-02-35.030 3185-02-35.00 3185-02-35.042 3185-02-35.046 |
3,155 g |
| 0.2 ...30.0** | GFM-30 | 3843-03-35.030** 3843-03-35.00** 3843-03-35.042** 3843-03-35.046 ** 3843-03-35.99 ** |
3846-03-35.030** 3846-03-35.00** 3846-03-35.042** 3846-03-35.046 ** 3846-03-35.99 ** |
1,481 g | 3885-03-35.030** 3885-03-35.00** 3885-03-35.042** 3885-03-35.046 ** |
1,641 g |
| 0.2 ...30.0 | GFM-30 | 3143-03-35.030 3143-03-35.00 3143-03-35.042 3143-03-35.046 3143-03-35.99 |
3146-03-35.030 3146-03-35.00 3146-03-35.042 3146-03-35.046 3146-03-35.99 |
4,074 g | 3185-03-35.030 3185-03-35.00 3185-03-35.042 3185-03-35.046 |
4,186 g |
| 0.7 ...70.0 | GFM-70 | 3143-04-35.030 3143-04-35.00 3143-04-35.042 3143-04-35.046 3143-04-35.99 |
3146-04-35.030 3146-04-35.00 3146-04-35.042 3146-04-35.046 3146-04-35.99 |
9,000 g | 3185-04-35.030 3185-04-35.00 3185-04-35.042 3185-04-35.046 |
9,100 g |
| 3 ...300 | GFM-300 | 3143-05-35.030 3143-05-35.00 3143-05-35.042 3143-05-35.046 3143-05-35.99 |
3146-05-35.030 3146-05-35.00 3146-05-35.042 3146-05-35.046 3146-05-35.99 |
32,330 g | 3185-05-35.030 3185-05-35.00 3185-05-35.042 3185-05-35.046 |
32,490 g |
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