JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 65)

6 Safety Manual
59 2013-04-01
- Damage and corrosion of temperature probes – protection tubes
- Corrosion and correct positioning of the contacts and terminals of cable connections
- Seals of terminal heads and cable ducts
- Interruptions due to "knocking" on the temperature probe/measuring insert
Since the maximum operating temperature influences the drift behavior, the temperature probe should be recalibrated or re-
placed at certain intervals to ensure reliable and precise temperature measurement.
The testing intervals are listed in the table below:
6.17 Intrinsic safety according to DIN EN 60079-11
v
Chapter 7 "ATEX"
Table 16: Testing intervals
Maximum operating temper-
ature
Pt - RTD temperature probes Thermocouples
200 °C 5 years 5 years
550 °C 2 years 5 years
700 °C 1 year 2 years
1000 °C Base metal 1 year
Noble metal 2 years
1500 °C 1 year
H
The testing intervals specified here are recommendations that must be adapted to the special conditions at the op-
erating location and,
if necessary, the user should perform the tests more regularly.