Lake-monitors Flow Transmitters Manuel d'utilisateur télécharger pdf (Page 31)

The sensor array located in the sensor assembly sends a signal

relative to the position of the follower to the signal conditioning circuit.

The signal conditioning circuit converts the signal from the sensor

array into three different signals that are all directly proportional to the

reading that is determined by relating the position of the flow indicator

line to the flow rate scale.

The user may choose between reading a 0-2000 Hz square wave

pulse, a 0-5 VDC analog signal, or a two-wire 4-20 mA analog signal

by connecting to the appropriate pins on the 4-pin Hirschmann® din

connector and by placing the programmable jumper in the appropriate

position for the desired output.

An analog 1-5 VDC output may also be obtained by configuring the unit

for the two-wire 4-20 mA output and then connecting a 249W ohm

resistor to the current loop. The exact output pins and jumper positions

that correspond to each output are discussed later in this manual.

4-20 mA Output Connections

Input Voltage:

The supply voltage must be between 12 and 35 VDC.The maximum

resistance that may be placed within the current loop is given by the

following formula:

Where: R

max

= the maximum resistance that may be placed in the

current loop (

Ω)

= the value of the supply voltage (VDC)

Page 31 / Flow Transmitters / Lake Manual

max

= 50(V

- 12)

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Lake-monitors Flow Transmitters Manuel d'utilisateur Page 31