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FG 40

Incremental encoder with a solid shaft

The incremental encoder FG 40 with a solid shaft is an extremely rugged and at the same time reliable device to measure speed, which has been designed and built for use in heavy industry applications. As a further development of the proven FG 4 series, it is designed to offer extremely high resistance to shock and vibration loads and high protection class up to IP67. The high-quality signal with up to a million pulses guarantees exact measurement results even under harsh conditions. A second shaft end facilitates coupling further devices. A feature of the compact design is the axial terminal box. As is the case with all Huebner products, it is possible to configure this device to suit individual customer requirements – flange and foot mounted versions are optional depending on the installation situation. If required, it is possible to add an electronic overspeed switch as well as a direction of rotation and standstill detection functionality.


Diameter solid shaft

11 mm or 14 mm

Supply voltage

12 - 30 VDC

Signal amplitude

HTL, TTL, Sin/Cos

Standard pulse rates HTL/TTL

1000, 1024, 1200, 2000, 2048, 2400, 2500

Special pulse rates HTL/TTL

4000, 4096, 4800, 5000, 8192, 10000, 12000, 16000, 16384, 20000, 25000 up to 1 million

Standard pulse rates Sin/Cos

500, 600, 1000, 1024, 1200, 1300, 2500

Output signals

0°, 90° channels and inverted signals

Maximum frequency

200 kHz

Device temperature range

0 °C to +70 °C


-25 °C to +85 °C

-40 °C to +85 °C

-5 °C to +100 °C

Degree of protection

Up to IP66 / IP67


Approx. 3.5 kg

Option N

Mechanically fixed reference pulse (N), one square pulse per revolution, with inverted signal

Option 2F

Twice as many pulses as basic channel by combining the 0° and 90° channels

Option B

Rapid direction of rotation sensing at each edge of 0° and 90° channels

Option B2

Rapid direction of rotation sensing at each edge of 0° and 90° channels; additional standstill detection

Option B3

Direction of rotation dependent output signals. This option supports counter cards with separate UP/DOWN pulse inputs. Basic channel signals are issued at optional output 1 when rotation is clockwise and at optional output 2 when rotation is counterclockwise.

Option S

Electronic overspeed switch with two mutually independent, programmable switching points

Option FOC

As an alternative to conventional signal transmissions via copper cables it is also possible to transmit encoder signals via fiber optic cables

Option SH

1 Vpp signals sine, cosine, reference pulse; error as HTL signal; all respective signals with inverted signals

Option ST

1 Vpp signals sine, cosine, reference pulse; error as TTL signal; all respective signals with inverted signals

Operating and Assembly Instructions (PDF, 4.37 MB) Download
Operating and Assembly Instructions (UL) (PDF, 2.53 MB) Download
Catalog - FG 40 (PDF, 2.9 MB) Download
Inquiry form - Incremental encoder (PDF, 165 KB) Download
Case Study - Stone recognition, mining (PDF, 163 KB) Download
Case Study - Inclined converter hoist, rolling mill (PDF, 124 KB) Download
Product article series FG 40 (PDF, 178 KB) Download
UL/CSA Certificate of Compliance (PDF, 262 KB) Download


Standard dimension drawings and connection diagrams are provided in the Operating and Installation Instructions. We would be pleased to send you individual variations as well as DXF/STEP files on request.