Siemens SITRANS P DS III, Руководство по обслуживанию

Страница: 32 / 74

Maintenance and servicing
5.2 Defining the maintenance interval
SITRANS P DS III
32
Service Manual, 06/2014, A5E34219855-01
NOTICE
Electrostatic-sensitive devices
The device contains electrostatic-sensitive devices (ESD). ESD can be destroyed by
voltages far too low to be detected by humans. These voltages can occur if you simply
touch a component part or the electrical connections of a module without being
electrostatically discharged. The damage to a module caused by overvoltage cannot
normally be detected immediately; it only becomes apparent after a longer period of
operating time has elapsed.
Protective measures against the discharge of static electricity:
•
Make sure that no power is applied.
• Before working with modules, make sure that you discharge static from your body, for
example by touching a grounded object.
• Devices and tools used must be free of static charge.
•
Hold modules only by their edges.
•
Do not touch connector pins or conductor tracks on a module with the ESD notice.
5.2 Defining the maintenance interval
WARNING
No maintenance interval has been defined
Device failure, device damage, and risk of injury.
•
Define a maintenance interval for regular tests in line with device use and empirical
values.
•
The maintenance interval will vary from site to site depending on corrosion resistance.