3�2 Analogue Output - TESTO 0555 6451 Operating Instructions Manual

3.2 Analogue output
The unit provides an analogue signal that is proportional to the volumetric flow
quantity, the medium temperature or the pressure�
Within the measuring range the analogue signal is 4���20 mA�
The measuring range is scalable:
• [ASPx] determines at which measured value the output signal is 4 mA�
• [AEPx] determines at which measured value the output signal is 20 mA�
Minimum distance between [ASPx] and [AEPx] = 20 % of the final value of
the measuring range�
If the measured value is outside the measuring range or in the event of an internal
error, the current signal indicated in Fig� 1 is provided�
For measured values outside the display range or in case of a fault, messages are
displayed (cr.UL, UL, OL, cr.OL, Err; → 11).
The analogue signal in case of a fault is adjustable (→ 9.6.10):
• [FOU] = On determines that the analogue signal goes to the upper final value
(21�5 mA) in case of an error�
• [FOU] = OFF determines that the analogue signal goes to the lower final value
(3�5 mA) in case of an error�
• [FOU] = OU defines that the analogue signal goes to the upper final value
(21�5 mA) in case of a pressure measurement error and to the lower final value
(3�5 mA) in case of a flow / temperature measurement error�
UK
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