Lake Monitors FlowStat ES Sensor (Plastic) - Manual (Page 5)

Set Point Adjustment (Relay Output Only)
1) Adjust the flow rate through the line in which the FlowStat sensor is
installed to the rate that corresponds to the desired relay trip point.
2) If the red LED on the back side of the sensor is not illuminated, use a
small flat bladed screwdriver to slowly turn the adjustment screw on the
set point potentiometer counter-clockwise until the red LED illuminates.
3) If the red LED is already illuminated, turn the adjustment screw on
the potentiometer clockwise until red LED turns off. Next, slowly
rotate the adjustment screw counter-clockwise until the red LED
illuminates.
4) Once the set point has been adjusted, the relay will operate as
shown in the Truth Table illustrated in Table 2 below.
Table 2.: Truth Table - Relay Operation
Service and Maintenance
The sensor is designed to provide years of low maintenance service
in industrial environments. As with all mechanical rotating devices, the
bearing surfaces will wear with use. The life of the parts will depend
on factors such as cleanliness of the fluid, media, mounting orienta-
tion, temperature, fluid velocity and frequency of operation. The
FlowStat sensor was designed with simple field-replacement of the
rotating parts in mind. To inspect or replace the rotating components:
(8)
Condition
Relay NC
Contact
Relay NO
Contact
Red LED Green LED
Flow rate<
set point
Open Closed Illuminated Illuminated
Flow rate >
set point
Closed Open
Not
Illuminated
Illuminated
Loss of power
to sensor
Open Closed
Not
Illuminated
Not
Illuminated
Apply the DC supply voltage directly across the sensor wires. If
the LED does illuminate, the load is either: too great of imped-
ance or an open circuit. If the LED does not illuminate, the sen-
sor's lead wires or circuit are defective.
6. The installation should be complete.
Installation - Electronic (0-5V DC Output Only)
1. Connect the red wire (pin 1 for units with the electronic disconnect
option) from the sensor to the positive terminal of the 12-35 VDC
power supply.
2. Connect the black wire from the transmitter (pin 2 for units with the
electronic disconnect option) to the negative terminal of the 12-35
VDC power supply.
3. Connect the green wire from the transmitter (pin 3 for units with
electronic disconnect) to the (+) 0-5 V DC input of the data acquisi-
tion device. This connection may be labeled "Voltage Input" or
"Analog Input" on some devices.
4. If applicable, connect the negative side of the power supply to the
negative side of the pulse input.
5. Apply power to the system.
6. If everything is operating correctly, the green LED will illuminate
brightly and the data acquisition device should show an increase in
flow rate as fluid starts flowing through the sensor.
If data acquisition device does not show an increase in flow rate:
check wiring terminations for good connections
verify that the LED is illuminated
verify that the DC supply voltage is between 12 and 35 V DC
(5)