Instruction Manual
NivuFlow 650
page 44
NF 650 - rev. 01 / 29.06.2020
21.4 Relays
Contact reliability deteriorates if the minimum make/break current is lower than specified.
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Observe the wiring and switching specifications of the relays in Sect. “16 Specifica-
tions”.
DANGER
Danger from electrical current – Measures to prevent accidental contacts
Contact protection according to the requirements as specified in EN 61010-1:2010 is not
guaranteed in the event of relay voltages >150 V due to the testing pin terminal of the relay
clamp blocks.
Take all necessary precautions against electrical shock according to the laws and regula-
tions! For example: Open the cabinet/field enclosure only by the use of a tool or key, or use
a fault-current circuit breaker or similar.
Non-observance may result in personal injuries.
DANGER
Danger from electrical current – Protect Relay Contacts
The relay contacts of the instrument shall be protected using 6 A slow-blow fuses if voltages
in the low voltage range (such as AC supply voltages) are to be switched via the instru-
ment’s relay contacts. Moreover these contacts shall be designed so as to be switched off
independent of other circuit parts.
DC units shall be equipped with an appropriate protective earth conductor in order to avoid
dangerous voltages or currents.
Non-observance may result in personal injuries.
22 Installation and Connection of Sensors
You can find detailed installation instructions for the individual sensor types in the according
Installation Instructions Manual.
Note
Always ensure compliance with the safety regulations during installation works.
22.1 Sensor Installation Principles
The placing of sensors is vital for the reliability and accuracy of measurements. Therefore
ensure proper hydraulic conditions and appropriate calming sections at the installation site.
Sensor types as well as the respective fastening methods shall be determined individually
depending on the place of measurement.
Conditions on how to select calming sections and the installation of sensors
are described in the
“
Installation Instructions Transit Time Sensors
”
.
Operational parameters need to be assigned to the point of measurement before or during
installation. Please refer to the documentation for the respective system for details on how to
prepare the point of measurement and its dimensions.
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Содержание NivuFlow 650
Страница 39: ...Installation and Connection page 39 NF 650 rev 01 29 06 2020 Fig 21 4 Terminal connections NivuFlow 650 Type T4...
Страница 41: ...Installation and Connection page 41 NF 650 rev 01 29 06 2020 Fig 21 6 Terminal connections NivuFlow 650 Type TZ...
Страница 173: ...Approvals and Certificates Page 173 NF 650 rev 01 29 06 2020 Approvals and Certificates...