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Your benefits

Simple and fast
sensing and reading of the oil temperature and its remaining service life.

warning messages issued if the predefined limit values, such as max. oil temperature, are exceeded.

Individually planned
maintenance intervals allow optimum utilization of oil service life and reduce maintenance costs.

Keeping an eye on the remaining service life of your oil

The DUO (Diagnostic Unit Oil aging) diagnostic unit carries out a thermal analysis on your gear unit oil. A thermal sensor measures the oil temperature and sends this information to an evaluation unit, which then calculates the time remaining service life for the specified oil type.

All you need to do is define the limit values so that DUO can send you a warning message when they are exceeded. In practice, this means that you can keep an eye on the remaining oil service life – and thus the performance – of your mechanical drive technology at all times.

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  • The perfect sensor for determining the remaining service life of the gear unit oil and reliably indicating the right time for an oil change
  • A thermal sensor installed in the gear unit measures the oil temperature and sends this information to an evaluation unit, which then calculates the remaining service life for the specified oil type
  • The diagnostic unit takes into account the oxidation characteristics of the different oils under thermal stress
Technical dataValue
Types of oil
  • Mineral oil CLP or bio oil
  • TMax. = 100°C
  • Synthetic oil CLP HC or CLP PAO
  • TMax. = 130°C
  • Polyglycol CLP PG
  • TMax. = 130°C
  • Food grade oil
  • TMax. = 100°C
Permitted oil temperature-40...+130°C
Permitted temperature sensorsPT100 or PT1000
EMCEN61000-4-2 ESD: 4 kV CD/8 kV AD
EN61000-4-3 HF blasted: 10 V/m
EN61000-4-4 burst: 2 kV
EN61000-4-6 HF cable-conducted: 10 V
Ambient temperature-20...+70°C
Operating voltageDC 18 ... 28 V1)
Current consumption at DC 24 V< 90 mA (when display is active)
Protection classIII
Degree of protectionIP67 (optionally IP69K)
Housing materialsDiagnostic unit
V2A; EPDM/X (Santoprene); PBT (Pocan); FPM (Viton)
Temperature sensorV4A
Electrical connectionDiagnostic unitM12 plug connector
Temperature sensor
  • PT1000: M12 plug connector
  • PT100: Plug connector in line with DIN 43650

1) in accordance with EN 50178, SELV, PELV

  • Helical gear unit, sizes R67 - R167
  • Parallel-shaft helical gear unit, sizes F57 - F157
  • Helical-bevel gear unit, sizes K37 - K187
  • Helical-worm gear unit, sizes S67 - S97

For installation on small sizes or industrial gear units, please contact SEW‑EURODRIVE.

  • The DUO diagnostic unit is recommended for us in a wide range of industries and areas of application. The continuous monitoring of the remaining oil life makes it possible to determine the optimum time to change the oil.
  • This is especially useful when working with fluctuating loads, speeds and ambient temperatures. Such conditions make it difficult to calculate the optimum time for an oil change using service life curves.
  • The DUO diagnostic unit can also reduce the risk of failure in critical systems where machine and production standstills are associated with high costs.