Emerson IFT9701 Manual De Usuario

25

 continued

The pulse output is a passive, open collector interface that can be connected to a pulse counter such as 
the Micro Motion Series 3000 applications platform. The output has a range of 0.1 to 7200 Hz, which 
represents the mass or volume flow rate. At the factory, the output is scaled so that the frequency is 
proportional to the range of flow rates measured in the application.

•

The pulse output is galvanically isolated to ±500 VDC from the rest of the flowmeter.

•

When connected to the Series 3000 applications platform, the pulse output does not require an 
external power source. Otherwise, the pulse output requires a 5–30 VDC power source.

•

In the ON state, voltage will be less than 1 V.

•

For wiring to any pulse counter, see Figures 4-6 and 4-7.

•

For wiring to the Series 3000 applications platform, see Figures 4-8 through 4-10.

Make sure the current through the pulse output circuit 
does not exceed 10 mA. 

For acceptable resistance values at on and off states of 
the pulse output, see illustration below.

Acceptable 

resistance

V

o

ltag

e (V

o

lts)

Resistance (Ohms)