Endress+Hauser Prosonic Flow 91 W Einbauanleitung Seite 7

• The following requirements must be met with regard to specialized technical staff for the
mounting, electrical installation, commissioning, maintenance and repair of the measuring
devices:
– Specialized technical staff must be trained in instrument safety.
– They must be familiar with the individual operating conditions of the devices.
– In the case of Ex-certified measuring devices, they must also be trained in explosion
protection.
• The measuring device is energized! Risk of fatal injury from electric shock. Open the
measuring device only when the device is de-energized.
• When using Ex-certified measuring devices: Open device only when in a de-energized state
(allow 10 minutes to elapse after switching off the power supply) or in environments which
do not have a potentially explosive atmosphere.
• In the case of measuring devices in safety-related applications in accordance with
IEC 61508 or IEC 61511: Commission in accordance with Operating Instructions after
repair. Document the repair procedure.
• Before removing the device: set the process to a safe state and purge the pipe of dangerous
process substances.
• Hot surfaces! Risk of injury! Before commencing work: allow the system and measuring
device to cool down to a touchable temperature.
• In the case of devices in custody transfer, the custody transfer status no longer applies once
the seal has been removed.
• The Operating Instructions for the device must be followed.
• Risk of damaging the electronic components! Ensure you have a working environment
protected from electrostatic discharge.
• After removing the electronics compartment cover: risk of electrical shock due to missing
touch protection!
Turn the measuring device off before removing internal covers.
• Modifications to the measuring device are not permitted.
• Only open the housing for a brief period. Avoid the penetration of foreign bodies, moisture
or contaminants.
• Replace defective seals only with original seals from Endress+Hauser.
• If threads are damaged or defective, the measuring device must be repaired.
• Threads (e.g. of the electronics compartment cover and connection compartment cover)
must be lubricated if an abrasion-proof dry lubricant is not available. Use acid-free, non-
hardening lubricant.
• If spacing is reduced or the dielectric strength of the measuring device cannot be
guaranteed during repair work, perform a test on completion of the work (e.g. high-voltage
test in accordance with the manufacturer' s instructions).
• Service plug:
– Do not connect in explosive atmospheres.
– Only connect to Endress+Hauser service devices.
• Observe the instructions for transporting and returning the device outlined in the Operating
Instructions.
If you have any questions, please contact your
Endress+Hauser
Endress+Hauser service
EA00040D
organization.
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