Chemicals; Overview And Operation - Toro Micro-Master Series User Manual

13

Chemicals

13.1

Overview and Operation

The Micro-Master Touch supports up to eight independent chemicals.
Each Chemical can be named and can be enabled or disabled.
Each chemical can be assigned to one station output located in any Remote Unit, or to one of the
four outputs on the front panel. Each chemical may have its own flow meter or may use the same
flow meter as the irrigation program. Chemicals may have different irrigation units, either hours and
minutes, minutes and seconds or volumetric. If volumetric irrigation is selected, a flow meter must
be assigned and the units will be the defined by the selected flow meter.
Chemicals may have pre-wet or mixing times, and can be selected to continue mixing during
injection. The delay between program start and the commencement of injection is to allow sufficient
time for agitation of dissolved chemicals and a degree of soil pre-wetting to aid in the dispersal and
penetration of the chemical into the soil. The Pre-wet / Mixing time is always in minutes and
seconds.
Chemical Injection Operation
When chemical injection is required by an irrigation program, the chemical injection begins the
prewet/mixing time delay. If this delay is zero, chemical injection begins immediately. If a delay is
set, and no station output is assigned to the preset/mixing station parameter, the delay time still
activates. When the delay times out, the allocated station is activated for the time specified by the
irrigation program. When the time completes or irrigation volume is reached, chemical injection is
stopped and the chemical returns to idle.
If the irrigation program enters a hold condition during injection, the chemical is also held. If 'mix
during injection' is enabled, the mixing station output will remain activated during hold. If the hold
condition is activated during the prewet/mixing delay, the mixing station output will remain activated,
but the delay will continue until completion, when the chemical will immediately be put on hold.
The chemical injection operation is shown in Figure 54.
Start
Idle
© 2014 Toro Australia Pty Ltd
Micro-Master Touch User Guide
Prewet
Delay
Finish
Figure 54 - Chemical Injection Operation Schematic
Delay
Complete
Program Hold
Active
Program Unhold
77
Held
Ver 1.2, June 2014