Lake Monitors Flow Transmitters - Manual (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: Rmax = the maximum resistance that may be placed in the
current loop ( Ω )
Vs = the value of the supply voltage (VDC)
Page 31 / Flow Transmitters / Lake Manual
Rmax = 50(Vs - 12)