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Front view of Weathermatic SmartLine SLM12 12-station expansion module showing terminal connectors, circuit board components, and mounting profile for irrigation controllers (photo).

Weathermatic SmartLine SLM12 12-Station Expansion Module

Brand: Weathermatic
Save 27%
$315.93
$229.05
SKU SLM12
In Stock (1)

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The Weathermatic SmartLine SLM12 is a 12-station expansion module that adds scalable zone capacity, on-board diagnostics, and SmartLine ET intelligence to compatible controllers. It supports both Basic and Smart modes so installers can use conventional programming or enable automatic ET-based adjustments for improved water management.

  • 12-zone expansion: Adds up to 12 irrigation stations to compatible SmartLine controllers (SL4800, SL1600, PL1600 and similar), allowing simple capacity increases without replacing the controller.
  • Dual operating modes: Basic mode offers conventional programming; Smart mode uses ET Watering to automatically adjust duration, frequency, and soak times based on environmental data.
  • Diagnostics and troubleshooting: Fault review shows open/shorted zones; on-board multimeter reports transformer voltage and milliamps; built-in valve locator helps identify and exercise solenoids.
  • Performance review: Menus display ET deficits by zone, accumulated run times, maximum run limits, minimum soak times, and recent high/low temperature history to fine-tune schedules.
  • Remote management: Compatible with the SmartLink network for remote access and monitoring via computer, tablet, or smartphone.
  • Installer-friendly: No battery required; modules must be installed left-to-right with no gaps and require AC power for recognition. Programmable rain delay and standard installation documentation simplify setup.

Designed for contractors and facilities that need weather-responsive, scalable irrigation control, the SLM12 provides clear diagnostics, valve locating, and SmartLine connectivity to reduce water use and simplify service. Manuals and installation guides are available for site-specific setup and commissioning.

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Frequently Asked Questions

What controllers is the SLM12 compatible with?
Compatible with SmartLine controllers such as SL4800 and SL1600; also fits PL series modules depending on model.
How many zones does the SLM12 add?
The module adds 12 irrigation stations to expand a SmartLine controller's capacity.
Does the SLM12 require batteries or extra power?
No batteries are required. AC power must be present for the controller to recognize installed modules.
What diagnostics and tools are included on the module?
On-board fault review, multimeter readings for transformer/zone current, valve locator, and review menus for ET deficits and run times.