Endress+Hauser magphant, Operating Manual

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4. Operation
4.1 Operating and display surfaces
Note!
Customer settings can be noted on the operating and display surface.
Setting limit value as
percentage of the set
full-scale value
Potentiometer for
setting the full-scale
Green LED
for full-scale setting
Red LED
for limit value or error
indication
Test mode
Current output
Time constant and
relay latch time Relay function Min./max fail-safe
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025y
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Fig. 14:
Operating and display elements
with factory settings
Functions of the operating and display elements
Operating and display element
(factory setting)
Description of function
Time constant / Relay latch time
The times t = 3 s and t =10 s correspond to the current
output time constant and also to the relay latch time.
t = 3 s: The relay switches immediately and then remains
in this state for 3 seconds.
t = 10 s: The relay first switches when the measured value
is below or above the limit value for a continuous
10 seconds.
Relay functions
The relay is energised if all functions are operating
correctly. The relay is de-energised immediately when an
error or alarm occurs.
limit
The relay de-energises or the red LED lights up if the
signal moves outside the upper or lower limit value
(depending on the min./max. fail-safe setting).
(limit) + error
The same function as for "limit", but in addition:
The relay de-energises if the flow rate is larger than the
measurable value of the Magphant or if an instrument error
occurs. The red LED flashes. "Error" has higher priority
than "limit".
Magphant 4. Operation
Hauser 15