➤ Current range
Works setting: 4...20 mA
Switch No. 4: OFF
The current at zero flow (Q = 0) can be set to 0 or 4 mA. The current for the full-scale
value is always 20 mA. Extension to 20,5 mA is possible.
Note!
The Promag 30 measuring system can be operated in a bidirectional or unidirectional
mode. Selecting this mode is dependent on the status output and functions as follows:
➤ Pulse value
Works setting: at v ~ 2.5 m/s
Switches No. 5, 6, 7: OFF-OFF-ON
The pulse value indicates for what freely selected volume flow an output pulse is
emitted. With an external counter these pulses can be totalled enabling the total
volume flow to be determined.
The pulse-pause ratio is approx. 1:1. The pulse width is limited to a maximum of 2 s
(≤0.25 Hz). At f = 400 Hz the maximum pulse width is 1 ms.
For the Promag 30 measuring system eight preset pulse-value steps can be selected
in terms of the nominal diameter. Setting is made by means of three miniature
switches (see page 37).
Configuration of status output Operating mode Function
Flow direction Bidirectional
•
Continuous current and
pulse output
System and process errors Unidirectional
•
Current and pulse output for
positive flow direction only
I [mA]
Forward
flow
Reverse
flow
Scaled full-
scale value
(end value)
Scaled full-
scale value
(end value)
[Volume/time]
Q
-Q
4...20 mA
0...20 mA
20,5
20
ba008y34
Fig. 37
Promag 30 5. Operation and Commissioning
Endress+Hauser 35
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