JUMO 00577948, Safety Manual, Page: 23 / 26

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5 Safety-related applications
5.7 Regular tests
Regularly test the function of the entire safety loop according to IEC/EN 61508 and EN 61511.
The intervals for the inspection are specified by the intervals for the individual devices in the safety loop.
It is the responsibility of the operator to select the type of inspection and the intervals in the specified
period of time.
The test must be carried out so that the correct function of the safety device can be demonstrated in
conjunction with all components.
In SIL applications, the devices have to be checked after the maximum maintenance/test interval at the
latest if they make up a proportion of the entire safety circuit that is not more than 10 %.
Possible behavior for the recurring tests in order to detect dangerous and undetected device faults
A calibrated simulator (current 0/4 to 20 mA) or a sensor simulator and one or (preferably) two calibrated
digital multimeters are required to test the devices.
1. Carry out the appropriate steps in order to prevent misuse.
2. Disconnect the safety circuit from further processing steps.
3. Connect the current simulator to the input of the repeater power supply and input isolating amplifier
or connect the sensor simulator to the input of the transmitter.
4. Connect the digital multimeters to the input and output of the repeater power supply and input iso-
lating amplifier respectively.
5. Set a signal in the range of 4 to 20 mA at the input of the device or set a suitable signal at the input
of the connected transmitter with the sensor simulator.
6. Measure the current in the repeater power supply and input isolating amplifier. The output must ad-
just to the same value.
7. You can verify that subsequent processing steps can detect and accordingly evaluate signals outside
of the range by applying a setting of ≤ 3.6 mA/> 21 mA. If the output value deviates by more than 3x
the specified class accuracy from the input value, the device should be inspected. Replace the de-
vice with an equivalent device in the event of a fault.
8. Establish the full function of the safety circuit.
9. Establish normal operation again.
5.8 Repairs
The devices have a long life cycle, are protected against malfunctions, and are maintenance-free.
If a device fails despite this, send it back to JUMO GmbH & Co. KG. Specify the type of malfunction and
the possible reason for the malfunction when doing so.
Use the original package or a suitably secure transport container to send back devices for repair.
Download the "Supplementary sheet for product returns" from our website, please fill it out, and send it
together with the faulty device to:
JUMO GmbH & Co. KG
Moritz-Juchheim-Straße 1
36039 Fulda
GERMANY