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User Manual EE680
Air Velocity and Temperature Sensor for Laminar Flow
Do not touch the sensing element with your fingers at any time!
Do not shake, knock or tap the wet sensor head!
Any mechanical contact with the sensing element incorporated in the sensing head will cause
irreversible damage to the sensor and needs to be avoided at any time!
Do not use any cleaning objects (e.g. brushes) to clean the sensor head!
7.2 Transportation
Whenever EE680 is needed to be returned for calibration, adjustment or repairs to E+E Elektronik
GmbH, contamination and any mechanical stresses during transport have to be avoided by
appropriate packaging measures. Please use the protection cap included in the scope of the supply
If the product was in contact with contaminating (poisonous, hazardous, explosive, …) substances,
decontamination of the sensor must be ensured before returning.
Returned sensors must not be harmful to the health of our employees at any time.
7.3 Repairs
Repairs may be carried out by the manufacturer only. The attempt of unauthorized repair excludes any
warranty claims.
7.4 Error Indication on the Analogue Output (NAMUR)
The EE680 features an error indication on its analogue outputs according to the NAMUR NE 043
recommendations (Standardization of the Signal Level for the Failure Information of Digital Transmitters,
Edition 2003-02-03, see
www.namur.net/en/recommendations-and-worksheets/current-nena.html
).
The feature is enabled by factory default and can be disabled with the EE-PCS Product Configuration
Software.
Output signal
NAMUR signal level
0 - 5 V
5.5 V
0 - 10 V
11 V
0 - 20 mA
21 mA
4 - 20 mA
21 mA
Tab. 5
NAMUR error indication
7.5 Error Indication on the EE-PCS
A probe failure is indicated as red flashing LED ring if the optical status indication is activated. When
connected to the EE-PCS, after initial startup such an EE680 probe generates device error messages
which point to the cause of failure. Fig. 23 shows an example where both the flow sensing and the
temperature sensing element face problems which lead to a probe failure.
