KROHNE ALTOSONIC III EN - Manual (Page 10)

ALTOSONIC III 10
3. Connecting
the signal
converter
3.1 Safety
instructions
This product is designed for use in accordance with EN IEC 61010-1 for Installation Category 2 and Pollution Degree 2.
Hazardous voltages are present within this product during normal operation.
The product is designed for Protection Class I and should never be operated without protective earthing.
The product shall also never be operated with covers removed unless equivalent protection of the operator and its environment
from accidental contact with hazardous internal voltages is provided. Always follow basic and local safety precautions when
using this product to reduce risk of injury from electrical shock, spread of fire or other dangerous situations.
3.2 Installation in
hazardous
areas
All ultrasonic flowmeters of the ALTOSONIC III series must always be incorporated within the equipotential bonding system of
the hazardous area. For this purpose it is provided with an external PE-terminal. The external PE-terminal is located on the
connecting flange at the bottom of the flow converter housing and on top of the support of the flow sensor, just below the junction
box.
A separate bonding conductor must be at least 4 mm
2 (11 AWG) or 2,5 mm 2 (14 AWG) in case it is mechanical protected, see
Clause 413 of HD 384.4.41 or IEC 364-4-41. Make sure that the core of the bonding wire is properly mounted under the U-clamp
of the PE-terminal and that the screw is tightly fixed.
3.3 Converter
terminal box
• The converter terminal box is accessible after removing the rear (blind) cover of the electronics section using the special
wrench supplied with the flowmeter.
• Do not damage the screw thread and the gasket, never allow dirt to accumulate, and make sure that the screw thread is well
greased, using Teflon grease at all times. A damaged gasket must be replaced immediately!
• Do not cross or loop the cables in the terminal box of the signal converter. Use separate cable entries for power supply and
signal cables.
3.4 Power supply
connection
Environmental conditions
The ALTOSONIC III is designed to operate safely under the following conditions:
• Suitable for indoor and outdoor use, the instrument is usable up to protection category IP 67 (IEC 60529).
• Use up to an altitude of 2000 m above sees.
• Suitable for an operation ambient temperature range: - 40°C to +70°C / - 40°F to +158°F.
• Suitable for an storage temperature range: -40°C to + 80°C / -40°F to + 176°F.
• Suitable for use in atmospheres with a relative humidity up to 80%.
• Mains supply voltage fluctuations up to -15 and +10% of the specified voltage range.
• Over voltages up to category II on the main supply voltage (IEC 60364-4-443).
• Connected to protective earth conductor (Protection Class I).
• Rated pollution degree 2.
• This instrument is intended for permanent connection to the mains. It is required (for example for service) to mount an
external switch or circuit breaker near the product for disconnection from the mains. It must be easily reachable by the
operator and marked as the disconnecting device for this product. The switch or circuit breaker has to be suitable for the
application and shall also be in accordance with to local (safety) requirements and of the building installation (IEC 60947-1/-
3).
• The protective conductor clamp terminal size M5, press-fitted in the terminal compartment (near the main connection
terminals), shall always to be connected to the protective earth conductor of the mains supply. Conductors up to 4 mm² (11
AWG) be connected to this terminal. The diameter of the conductors of the mains supply, including the protective earth
conductor shall be in accordance with the general and local requirements.
• It is not allowed to use the protective conductor terminal for any other connection than the protective earth conductor.
• IP 67 is only warranted when using suitable cabling with the cable glands and covers mounted as specified.