Toro TFS Flow Sensors User Manual


TFS Series, Toro Flow Sensor

Installation Instructions


The Toro flow sensors provide an accurate flow measurements by generating a frequency signal (pulses per second) that is proportional to the flow rate. The Toro flow sensors are designed for below grade applications for irrigation monitoring where the flow rates are between 0.5–30 ft/sec and temperatures are below 180º Fahrenheit. The

Toro flow sensors are supplied with two single conductor, 18 AWG solid copper wire leads with U.L. Style 116666 direct burial insulation. An internal preamplifier allows the pulse signal to travel up to 2000’ without further signal amplification.


Model Number





Flow Sensor, 1/2”, Plastic Tee






Flow Sensor, 3/4”, Plastic Tee



Flow Sensor, 1”, Plastic Tee






Flow Sensor, 1.5”, Plastic Tee






Flow Sensor, 2”, Plastic Tee






Flow Sensor, 3”, Plastic Tee






Flow Sensor, 4”, Plastic Tee




Controller Compatibility

The Toro flow sensors are compatible with the following controllers:

• Toro TMC-424

• Toro Intelli-SenseTM TIS-360/480

• Toro SentinelTM

• Toro SitePro®

• Irritrol MC-E

• Any controller compatible with Frequency output flow sensor


(Pulse per Second proportional to flow velocity)


The following table indicates the suggested flow range of the Toro flow sensors. Although the sensors will operate above and below the indicated flow rates, following the suggested range will ensure the best performance from the flow sensor. Sensors should be sized according to flow rates rather than pipe size.

Model Number

Suggested Operating

Suggested Operating

Suggested Operating

Range (Gallons / Minute)

Range (Liters / Second)

Range (Cubic Meters / Hour)



1.2 – 12

0.1 – 0.8

0.3 – 2.7






2.7 – 28

0.2 – 1.8

0.6 – 6.4



– 50

0.3 – 3.2

1.1 – 11.4


5 – 100

0.3 – 6.3

1.1 – 22.7








– 200

0.6 – 12.6

2.3 – 45.4








– 300

1.3 – 18.9

4.5 – 68.1








– 500

2.5 – 31.5

9.1 – 113.6

Flow Sensor to Pipeline Installation

The accuracy of the flow sensor’s measurement is highly dependent on proper sensor location within the piping system. Irregular flow velocity caused by valves, fittings, pipe bends, etc. can lead to inaccurate flow rate measurements even though local flow velocity measurements may be accurate. A sensor located in the pipe where it can be affected by air bubbles, floating debris, or sediment may not achieve full accuracy and could be damaged. The Toro flow sensors are designed to operate reliably even under adverse conditions but following recommendations will ensure maximum system accuracy.

Select a location along the pipe system that is 10 times the pipe diameter upstream and 5 times the pipe diameter downstream to minimize flow disturbance. Pipe bends, valves, pipe fittings, pipe enlargements and reductions should not be present within this pipe length.


10 X Pipe Diameter

5 X Pipe Diameter

Note: For 1.5” and larger flow sensors, install according to the flow direction shown by the arrow on the tee. For 1.0” and smaller flow sensors, installation is not dependent on flow direction.

Flow Sensor to Pipeline Installation

Step 1 - Remove the sensor from the tee.

a.For 1.5” and larger Sensors: Pull the clevis pin that retains the flow sensor to the tee, then carefully remove it from the tee.

b.For 1.0” and smaller Sensors: Unscrew the sensor cap from the tee by turning it counterclockwise. Carefully pull the sensor out from the tee.

Step 2 - Properly clean the pipe ends and tee socket.

Step 3 - Use solvent cement to secure the pipes to the tee.

Step 4 - Reinstall the sensor to the tee as follows:

a.For 1.5” and larger Sensors:

i.Align the flow arrow on top of the sensor housing to the direction of the flow.

ii.Carefully press the sensor straight into the tee.

iii.Install the clevis pin through the tee and sensor.

iiii.Install the cotter ring into the clevis pin.

b.For 1.0” and smaller Sensors:

i.Carefully line up the guide pin on the sensor to the slot on the tee.

ii.Carefully press the sensor straight into the tee.

iii.Screw the sensor cap firmly onto the tee.

Note: Hand tighten the sensor only.

Step 5 - Complete the wiring connections.

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