6 Mounting
PIOX R721
6.2 Sensor
27
UMPIOX_F72xV1-3EN, 2021-09-01
6.2.2
Mounting of the sensor
6.2.2.1
Selection of the measuring point
• Select a measuring point:
– which is representative for the process and relevant to the given application
– where the sensor can quickly respond to changes in the process
– where the pipe is always filled and no gas bubbles can form in the pipe
– where the flow can be stopped and the sensor can be installed and removed without problems
• In order to counteract the formation of deposits on the measuring prism and the window, the measuring point should be
selected in such way that:
– a minimum flow is always present in pipe
– the sensor is installed in pipe segments with small pipe diameters because smaller pipe diameters cause higher
pressures and, therefore a better cleaning effect
– the fluid temperature is relatively high but always within the operating range of the sensor because higher
temperatures increase the solubility and reduce the viscosity
• Select the location of the transmitter within the cable range of the measuring point. The ambient temperature at the
measuring point has to be within the operating temperature range of the transmitter and the sensor, see technical
specification.
• Protect the sensor against direct sunlight, rain and vibrations. The ambient temperature at the measuring point has to be
within the operating temperature range of the sensor, see technical specification.
If the measuring point is within an explosive atmosphere, possibly present danger zones and gases have to be
determined. The transmitter and sensor have to be appropriate for these conditions.
Observe the notes in the following table.
Caution!
Warning of severe injuries from hot or cold components
Touching hot or cold components can lead to severe injuries (e.g., thermal damage).
→ Any mounting, installation or connection work has to be concluded.
→ Any work on the measuring point during the measurement is prohibited.
→ Observe the ambient conditions at the measuring point during installation.
→ Wear the required personal protective equipment.
→ Observe the applicable rules.
Danger!
Warning of severe injuries caused by leakage of dangerous fluids
Dangerous fluids can escape from insufficiently tightened screw connections. The contact to the fluid may
result in personal or material damage or dangerous situations.
→ The mounting has to be carried out with a reproducible torque procedure and defined screw tightening
torque. The screw tightening torque depends on the used gasket and has to be defined by the
customer.
Important!
The sensor cable must never be wrapped around hot pipes.
