Emerson 2700 Manuel D’Utilisation

58

One frequency/pulse output (Model 1700 transmitters) or frequency/pulse/discrete output (Model 
2700 transmitters):

•

Intrinsically safe

•

Externally powered (passive)

•

Maximum input voltage: 30 VDC, 0.75 watt maximum

•

Frequency/pulse output (Model 1700/2700):

-

Can be used to indicate either flow rate or total; Model 1700 output reports the same flow 
variable as the mA output, Model 2700 output is independent from mA output

-

Scalable to 10,000 Hz

-

Linear with flow rate to 12,500 Hz

-

Configurable polarity: active high or active low

-

Maximum load limit: see following chart

0

100

200

300

400

500

600

700

800

900

1000

12

14

16

18

20

22

24

26

28

30

mA Output Load Resistance Value

R

max

 = (V

supply

 - 12)/0.023*

*If communicating with HART a minimum of 250 Ohms

and 17.75 V supply is needed

Supply voltage (volts)

Exter

nal resistor 

(Ohm

s)

Operating
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