JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 38)

6 Safety Manual
2013-04-01 32
6.3 Safety temperature limiter (STB)
The safety temperature limiter is a device that is permanently locked after responding.
Manual reset using the
key is possible once the probe temperature has fallen below / has exceeded the limit value by the
amount of the switching differential. Possible settings: monitoring for overrange or underrange.
Modes of operation:
- Minimum requirements: 2B, 2J, 2V, 2K, 2P, and adjustable with special tools
- Additional requirements met: 2N, 2F, 2D
6.3.1 Safe operating status STB
The safe status is when the alarm relay output between terminals 14 and 16 is switched off (closed-circuit principle).
This status is maintained until manual unlocking in the valid range of the JUMO safety
M STB/STW Ex.
The transparent, sealable protective cover prevents unauthorized operation.
The key for manual unlocking can be accessed with the aid of a tool.
6.4 Relevant standards
Failure of the devices could affect the safety of persons and/or the safety of the environment.
Certification according to IEC 61508 is provided due to the worldwide use of these systems.
The JUMO safety
M STB/STW Ex temperature monitoring unit with extra code "058" meets the requirements:
- For safety function to SIL3 according to DIN EN 61508 Parts 1 to 7:
Functional safety of electrical/electronic/programmable electronic safety-related systems
- DIN EN 61511 Parts 1 to 3:
Functional safety – safety instrumented systems for the process industry sector
- DIN EN 14597:2005-12:
Temperature control devices and temperature limiters for heat generating systems
- DIN EN 60730-2-9: