Flow Sensor Operations; Select Fill Delay Option - Toro TMC-424E User Manual

TMC424_UGE_466A 1/22/08

Flow Sensor Operations

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 or damaged sprinklers can be
quickly detected and bypassed automatically.
The TMC-424E accepts up to three flow-sensing expansion modules (flow
modules) that enable the controller to read, store and compare flow rate data
from individual flow meters. Each station connected to a flow-enabled expansion
module has the option of being flow monitored. After a defined delay period
(Fill Delay), a flow measurement is taken. If the station flow rate exceeds any
of the established thresholds, an alert is triggered; the station is bypassed and
operated at the next scheduled watering time.
After inserting a flow-sensor expansion module, the flow sensor icon
displayed and the following control features become accessible:
• Select flow sensing operations by individual station
• Automatically read and learn the flow rate of each station
• Measure flow as part of normal irrigation operation
• Set lower, upper and critical flow thresholds
• Immediately disable station and flow module master valve operation if flow
rate exceeds a critical flow threshold.
N O T E : The actual or "Learned" flow rate for each station should be established
prior to setting alert thresholds. To perform this operation, the Valve Test function,
True Manual or Timed Manual station operations can be used to operate each
s t a t i on for a two-minute run time required to establish the Learned flow rate.
Flow Module Setup Procedure
NOTE: The TMC-424E is designed for use with Toro TFS series flow sensors
only. Consult with an authorized Toro distributor prior to connecting other flow
sensor makes. For complete TFS flow sensor installation and setup information,
refer to the user's guide provided with the unit.

• Select Fill Delay option:

The fill delay period helps prevent false sensor readings caused by initial turbu-
lence within long main line runs. Fill delay setting postpones flow sampling up
to 9 minutes after irrigation begins.
1. Turn the Function Dial to Sensors
2. Set the Program Switch to select program A, B, C, or D.
3 . Press the
4. Press the
increments or leave at 0M if a fill delay is not required.
5. Repeat this procedure for each program as needed, starting at step 2.
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button as needed to display FIL: 0M (Fill delay – 0 minutes).
or button to select a delay period (1 – 9 minutes in 1-minute
.
is