Flow Sensor Operation - Toro TMC-424 Manual Del Usario

Flow Sensor Operation

Flow monitoring is one of the best water resource management tools available
in the irrigation industry today. With definable under-, over- and critical-flow
limits set, broken lateral or mainline piping, stuck valves and damaged sprinklers
can be quickly detected and bypassed automatically.
The TMC-424 accepts up to three Flow Sensor modules that enable it to read,
store and compare flow rate data from individual flow meters.
If a combination of Flow Sensor and Standard modules are installed, all stations
(including stations connected to standard modules) can be flow monitored. When
a Flow sensor is installed, the flow meter
corresponding bay number enabling you to:
• Automatically read and learn the flow rate of each station
• Measure flow as part of normal irrigation operation
• Set a lower, upper and critical-flow boundary range in 10% increments
• Immediately disable station and master valve operation if a flow rate exceeds
the established limit.
After one minute of operation to allow system stabilization, a flow measurement
is taken. If the flow rate exceeds the established boundaries, an alarm is
triggered. The affected station is bypassed at this start time and retried at the
next scheduled watering time. If the flow rate exceeds the critical limit, operation
of the affected station is immediately bypassed.
Note: The TMC-424 can run three programs (one station per program) simulta-
neously. When multiple stations operate simultaneously, the controller reads the
average total flow of these stations. If the stations do not have the same flow
range boundaries, the lowest % boundaries (narrowest range) will be used.
If a critical-flow boundary is reached for any one of the stations, an alarm is
triggered and the stations are bypassed.
Flow Sensing Setup Procedure
Note: The TMC-424 is designed for use with Data Industrial 228 and 250 series
flow sensors only. The K and Offset parameters for each flow sensor in these
series are automatically factored when the flow sensor size is selected.
1. Turn the Function Dial to the Sensors
2. Press the
07 = 0.75", 10 = 1.0", 15 = 1.5", 20 = 2", 30 = 3"and 40 = 4". The flow meter
icon indicates the module being addressed.
3. Press the
4. If more than one flow sensor is installed, repeat steps 2 and 3 as necessary.
5. Press the
Flow Sensor Module, select the switch type: NO (Normally Open) or NC
(Normally Closed).
6. Press the
14
button to display DIA: 07. This is the flow sensor size in inches.
or button to select the appropriate flow sensor size.
button to display MV:NC. If a master valve is connected to the
or button to display MV:NO or MV:NC.
icon is displayed next to the
position.