KROHNE CORIMASS G-MFM 4085 EN - Manual (Page 19)

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For the standard converter, the pulse output is passive and requires an external voltage
source for operation. In addition, the signal may need protection from external electrical
interference. The use of screened cables and a filter capacitor next to any counter is
recommended. (Fig. a)
It is possible to connect the pulse output without using an external voltage supply. However to
do this the function of the alarm output must be sacrificed. (Fig. b).
If the alarm output is used to power the pulse signal then the following settings must be made
in the menus.
(i) Fct. 3.5.1 ALARM FUNCTION must be set to OFF
(ii) Fct. 3.5.2 ALARM ACTIVE LEVEL must be set to ACTIVE LOW.
(Max. 24 V DC)
(
V ext ≤ 150 mA)
R ext
Fig. a Preferred connections to an external counter with separate power supply
(Example). For correct wiring see table of Input/ output connections
Fig. b Connection without external voltage source (Example). For correct wiring see
table of Input/ output connection