Datasheet

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Data Sheet 701150
2011-04-21/00540116
JUMO GmbH & Co. KG
Delivery address:Mackenrodtstraße 14,
36039 Fulda, Germany
Postal address: 36035 Fulda, Germany
Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
Internet: www.jumo.net
JUMO Instrument Co. Ltd.
JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2DY, UK
Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
Internet: www.jumo.co.uk
JUMO Process Control, Inc.
8 Technology Boulevard
Canastota, NY 13031, USA
Phone: 315-697-JUMO
1-800-554-JUMO
Fax: [phone]
e-mail: [e-mail]
Internet: www.jumo.us
Safety control and regulating instruments
Safety temperature monitors STW
1
The safety temperature monitor is a device that is automatically reset when activated, once the sensor temperature has fallen below or
risen above the set limit value by an amount equal to the hysteresis. Possible settings: monitoring for limit value overrange or under-
range.
Mode of operation:
Minimum requirements: 2B, 2K, 2P
additionally met requirements: 2N, 2D
Safety temperature limiters STB
1
The safety temperature limiter is a device that is permanently locked after response.
Manual reset using the RESET key is possible once the probe temperature is gone below / has exceeded the limit value by the hystere-
sis. Possible settings: monitoring for overrange or underrange.
Mode of operation:
Minimum requirement: 2B, 2J, 2V, 2K, 2P and adjustable with special tool
additionally met requirements: 2N, 2F, 2D
1
For more detailed explanation, see DIN EN 14 597.
Connection possibilities of the sensors
The STB/STW 701150 evaluation device structure is basically identical. There are various possibilities to connect the sensors. These possibilities
are listed in the following table together with the achievable SIL level:
No sensor system was taken into account for variant 5. In this case, the owner/user selects the sensor system. For this reason, the owner/user
is responsible for evaluating the achievable SIL.
If the SIL compatible sensor used consists of hardware and software (e.g. transmitter), it is possible to achieve the SIL irrespective of the archi-
tecture as a maximum, once the sensor software is developed, i.e. for example, in the case of the sensor software has SIL 2, the max. achievable
SIL is 2.
The possibility to connect passive sensors such as double thermocouples or PT100, Pt1000 sensors do not necessarily require a SIL qualification.
In this case, the specification of the failure rates of the passive sensors is sufficient for the SIL qualification of the overall system. The owner/user
of the system must always determine the PFD
avg
and/or PFH value of the overall safety circuit to evaluate the achieved SIL.
Variant connected sensors Sensor system archi-
tecture
Logics archi-
tecture
Achievable SIL
1 1 × Pt 100 in 2-wire circuit
individual sensor
1oo1 1oo2D SIL2
2 2x Pt 100/1000 1oo2 1oo2D SIL3
3 2x Thermocouples 1oo2 1oo2D SIL3
4 1x Pt 100/1000
1x Thermocouple
1oo2 1oo2D SIL3
5 STB/STW 70.1150 without
sensor system 1oo2D ar-
chitecture
no probe or use 4 to 20 mA
(means: the sensor is not
taken into account for cal-
culation.)
Sensors connected
by the system owner/
user
Architecture as per
connection 1oo1 or
1oo2
1oo2D SIL of the used sensor
(HW only)
max. achievable SIL
of the system with
1oo1 sensor system
architecture
max. achievable SIL
of the system with
1oo2 sensor system
architecture
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