SU2020 SU8020 SU2021 SU8021 SU2621 SU8621 Ultrasonic flow meter
48
• warning via operating status LED.
• reduced brightness or deactivation of display.
If the unit measures a high internal temperature, the display brightness is automatically
adjusted:
Internal temperature of the unit>64°C: brightness is reduced to 25%.
Internal temperature of the unit≥90°C: display is automatically switched off.
10.6.4.1 Reading via unit keys: internal temperature
u Go to the [EF] > [DIAG] menu.
u Select [Internal temperature] and read value.
10.6.4.2 Reading via IO-Link: internal temperature
u Select [Parameters] > [Diagnosis] > [Temperature].
u Select [Internal temperature] and read value.
10.6.5 Signal quality
The signal quality of the sensor can be affected by irregularities in the medium (e.g. strong
turbulences, air bubbles, particles or build-up).
The unit detects the signal quality in three stages:
Signal quality Explanation Operating status LED
Normal The unit operates without restrictions (normal operation). Lights green
Low The signal quality is disturbed, but the unit is still working
within its specifications.
Lights blue
No signal No medium is present or no signal can be created. Flashes red
The current value can be read from the unit’s display or via the IO-Link interface.
In addition, the signal quality can be indicated via a switching signal and/or an LED colour signal. See
also:
• Switching signal for signal quality (Ò/27)
• Operating status LED (Ò/48)
10.6.5.1 Reading via unit keys: signal quality
u Go to the [EF] > [DIAG] menu.
u Select [Signal quality] and read value.
10.6.5.2 Reading via IO-Link: signal quality
u Select [Parameters] > [Diagnosis].
u Select [Signal quality] and read value.
10.6.6 Operating status LED
The unit has an operating status LED that indicates deviations from normal operation (= diagnostic
cases) by a colour signal.
The function of the operating status LED is adjustable:
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