Smart Line SLW20 On-Site Weather Station
Smart Line SLW20 On-Site Weather Station
Smart Line SLW20 On-Site Weather Station

SLW20 Commercial On-Site Weather Monitor


  • Microprocessor records and processes weather data for use in establishing Auto Adjust run times
  • On-site measurement of ambient air temperature for use in ET calculation and prevention of watering in freezing conditions
  • On-site rain sensing device prevents watering in the rain and decrements accumulated ET deficits
  • Extended rain delay feature automatically adds 48 hours to rain events before deficits begin to accumulate so watering does not begin too quickly after a rain event (orange sensor LED indicates 48-hour delay period)
  • Protective disks on rain sensor allow nominal air flow while limiting water entry
  • Durable solar shield serves to prevent inaccurate temperature readings and allows mounting in direct sunlight
  • Review menu provides the ability to clear deficits for all zones
  • Review menu displays temperature readings (daily high/low) for the previous 5 days
  • Review menu accumulates total run times by zone from the last reset date

Auto Adjust Features

  • ZIP Code input (5 digit) or Latitude input (+/-60 degrees from EQUATOR) establish location of site for solar radiation calculation
  • Sprinkler type input allows selection for zone sprinkler type (SPRAY, ROTOR, DRIP, BUBBLER) with preset precipitation rate or specific input of the zone precipitation rate (.2" to 3.0" in. per hr.)
  • Plant type input allows selection for zone plant type (COOL TURF, WARM TURF, SHRUBS, ANNUALS, TREES, NATIVE) with preset crop factors or specific input of the zone crop factor (10 - 300%)
  • Soil type input allows selection for the soil type (CLAY, SAND, LOAM) and slope (1 - 25 degrees) for the purpose of automatically calculating a run/soak period to virtually eliminate run off
  • More/Less is settable by zone (-50% to +25%) for the purpose of fine tuning Auto Adjust run times to accommodate factors like shade, wind, and sprinkler inefficiencies

Manual Operation

  • Manual test runs each zone with zone run times from 10 sec. up to 10 min.
  • Manual zone operation of a single zone (1 min. to 9 hrs. 55 min.)
  • Push button manual start of a program from control panel

Programming Tips

  • The following programming tips are recommended to insure that the SmartLine will perform as promised.
In the Auto Adjust mode, you will realize greater savings by programming in the precipitation rate of 1.5" per hour for any spray head zones, rather than using the "Spray" option.

If you are not sure of your soil type, "clay" is the safest option.

If you are unsure of your degree of slope, you can program in the highest number that you think it might be. You will be sure to avoid run off this way. IF you have run- off, program in a higher degree of slope and make sure that the soil type is "clay".

Unless it has rained, the SmartLine controller will operate on the days and start times that you specify. You can increase your water savings by using the following scheduling guidelines:
Established Lawn - 2 or 3 days per week
Established shrubs and perennials - 1 or 2 days per week
Trees - 1 day per week
Annuals - 4 to 7 days per week
Groundcovers - 2 or 3 days per week
Natives - 1 day per week

The best start time is usually between 3 and 6:00 am.

It is a good idea to program default valve run times for every valve, when using the AUTO ADJUST feature, in case of any loss of connection to the weather monitor.

This feature can be used to manually adjust for shady areas, or a system that does not cover the area evenly.
Total Shade - Program the valve(s) to 50% LESS
Filtered Shade - Program the valve(s) to 20% LESS
Morning Shade - Program the valve(s) to 10% LESS
Afternoon Shade - Program the valve(s) to 30% LESS
Slightly Dry Area - Program the valve(s) to 10% MORE
Significantly Dry Area - Program the valve(s) to 25% MORE

Assuming that all entries are correct and areas are still dry, you may need to increase the efficiency of your irrigation system. It is also possible to decrease the precipitation rate(s) for any valve(s) that continue to show dry areas, thereby forcing increased run times. While this last option will cause you to use more water than necessary, your SmartLine controller will still save you money and water by constantly tracking the weather and adjusting the run times as needed.

It is advisable to allow the controller to operate for a few weeks and then do some fine tuning with the MORE/LESS feature.

After the rain sensor on the On-site Weather Monitor senses a rain event and deactivates, the Extended Rain Delay Feature automatically prevents watering for 48 hours. If you wish to have a longer delay after a rain fall (or any other event), you can manually set a delay of up to 7 days with the RAIN DLY feature. This feature will prevent watering time from accumulating for the programmed number of days. If you wish to prevent watering for longer than the 48 hours after a rain event, you will need to activate the RAIN DLY feature for the number of days that you wish to delay watering.

You can also use the RAIN DLY feature if rain is in the forecast and you want to prevent the system from operating a day or two prior to the rain fall. If it does not rain, the controller will not accumulate any watering time, but will begin operating normally after the RAIN DLY number of days.

If you are using the seasonal adjust feature and not operating with a weather monitor, the following chart from Santa Barbara City Water Conservation Department can help you to program in the monthly adjustments.

Once a month adjustments

inches of H20


JANUARY 1.95 46%
FEBRUARY 2.54 46%
MARCH 3.17 58%
APRIL 3.78 69%
MAY 4.84 88%
JUNE 5.08 93%
JULY 5.49 100%
AUGUST 4.49 82%
SEPTEMBER 3.42 62%
OCTOBER 2.36 43%
NOVEMBER 1.83 33%
DECEMBER 1.83 33%

Brand: Weathermatic
Item Number:
Price: 233.96
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