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GC-ProXLM Control System - $2,349.00


OEM / Manufacturer Edition of GC-ProXL

Same great features of GC-ProXL, simplified enclosure for installation directly into electrical enclosures.

Designed for integration into OEM electrical enclosures. Available in standard Agrowtek GrowControl models as specified below, or contact us for a specialized feature set unique to your application. Agrowtek's engineers can add and change features, sensors and more for specialized applications.

GC-ProXLM Standard Model Up to three (3) climate zones, two (2) zones each with hydroponics dosing for up to eight (8) parts plus two (2) pH.
GC-ProXLM-C Greenhouse Model Up to three (3) climate zones with eight (8) vent/shade motor controls and other greenhouse functions.
GC-ProXLM-Q Quad Zone Climate Only Model Up to four (4) climate zones with basic climate, lighting and timer controls (no dosing controls.)
XLM-OE Customized Custom engineered applications for OEMs; contact Agrowtek Inc.

Sensor Options

  • Indoor Climate Sensor (temperature, humidity & light irradiance) (CO2 optional)
  • Hydro Sensor Kit (pH, conductivity and water temperature)
  • Wind Sensor Kit (wind speed & direction)
  • Outdoor Temperature Sensor
  • Outdoor Light Sensor
  • Temperature Probes

Multi-Zone Control


The GC-ProXLM can operate multiple independent climate zones and two hydroponics zones from one controller.

Free PC Software

alt GrowControl Software (Installer)

GrowControlTM GC-ProXLM includes a powerful PC application offering full control of the system. The GC-ProXL can be operated without a touch-panel interface and with only PC software for economy applications. Features include graphical and spread-sheet data logging, status and control of inputs, outputs and sensor readings, all controls and settings, email alerts and more.


The Most American Made Controller!

We take pride in our efforts to source components for our products within these great United States! Our CPU's and touch panels are manufactured in the US, our sheet metal is fabricated and powder coated in Wisconsin, our pH and EC probes are manufactured in California, our temperature probes are manufactured in New York, and everything comes together at our final assembly operations with our skilled staff of engineers and technicians in Illinois.

alt GrowControlTM Model Guide | alt Controller Comparison Chart

alt Hardware/Installation Manual

alt GrowControlTM Software



  • Low-voltage 24VDC operation
  • (16) 24VDC Programmable Outputs (expandable up to 40)
  • (8) 24VDC Programmable Switch/Digital Sensor Inputs
  • (4) Analog Sensor ports (expandable up to 6)
  • Multi-Zone Control
  • Powder-coated sheet metal enclosure (Wisconsin)
  • Industrial components for long life/reliability (USA)
  • Designed & manufactured in the U.S.A.!
  • Full 3-Year Factory Direct Warranty

Control Functions:

  • Lighting Timers (each with secondary delay timer)
  • Light-Flip Control for Flip Box Operation
  • Day/Night Zones/Outputs
  • Cooling/Heating/Limit Thermostats
  • Humdify/Dehumidify Humdistats
  • 24-Hour Timers
  • Standard Cycle-Timers
  • 24-Hour Scheduled Cycle Timers
  • Off-Delay Timers
  • Re-start Delay Timers
  • 24-Hour Cancel Timers
  • Hour Meters
  • CO2 Injection & Ventilation Controls w/Boost Timer
    GC-ProXLM Only:
  • Nutrient Dosing with (8) proportional stages each, batch dosing, and 16 set-point scheduling
  • pH Dosing with (1) up and (1) down stage each
    GC-ProXLM-C Only:
  • VSC vent/shade/curtain proportional motor controls
  • Multi-stage hvac control & VSC integration


  • Aspirated Precision Electronic Climate Sensor for Air Temperature, Relative Humidity and Light Irradiance
  • GrowControlTM Software and User Manuals on CD
  • 60W 24VDC UL Class II Power Supply 110-240VAC


Frequently Asked Questions about GrowControlTM :

Do I need a computer to use GrowControlTM?
No! GrowControlTM can be operated via the touch-panel interface (optional.)

How do I connect GrowControl to my PC?
GrowControlTM is equipped standard with a serial port (rs-232.) The optional Ethernet port allows the controller to be connected to your local network and accessed via an IP address. Multiple PC's can access a controller connected via Ethernet.

Can I connect to a USB port?
Yes, you can connect the controller to your PC's USB 1.1/2.0 port with a "RS-232 to USB converter." Available with the control system or purchase your own. These converters require software drivers which emulate a serial COM port. Select the correct COM port in the GrowControl software.

What is the maximum distance to my PC?
The maximum recommended distance for serial communication is 50 feet. (50 foot extensions cables are available from Agrowtek.) The standard limit for Ethernet devices is 300 ft (100m.)

Can I send E-mail alerts?
Yes, GrowControlTM software allows you to send email alerts for a variety of avderse conditions.

Do I need Windows®?
Windows® is required to operate the GrowControlTM software. Agrowtek's software has been tested and designed to operate on Windows® XP, Windows® Vista, and Windows® 7 (32/64bit.) You must have the Microsoft® .Net environment installed.

Can I access the GrowControl software from the Internet?
Yes. If your controller is connected via Ethernet, you can map your ports to access the controller via the internet. If your controller is connected via the serial port, you can use a remote connection software such as Windows® remote desktop, PCAnywhere, Remote Administrator, etc. to access the software running on the connected computer.

How does the data logging feature work?
The touch-screen provides 24-hour trend graphs on-screen for each sensor reading. To log data to a file, a PC is required to operate to GrowControl software. Sensor readings can be tracked for up to 24-hours on the live trending chart and you can store up to your hard-drive's capacity by logging to .CSV (comma separated value) files. CSV files can be viewed and plotted in any spreadsheet application including Excel® and Log files can be added to continuously, or a new file can be created daily at a specified time.

What if my computer crashes?
GrowControlTM will continue to operate according to the settings you provided it even if your computer crashes, gets shut down or is otherwise interrupted. The control system operates completely independently of your PC.

What if the power goes out?
If the power is interrupted to the controller, GrowControlTM will re-start and continue operating where it left off when the power comes back on. An internal backup maintains the program settings and continues to run the real-time clock to maintain the proper time. Built-in hot-fire prevention will keep lights from being damaged due to hot-fire.

How are sensors connected and what are channels?
There are two sensor ports available with 4 channels each. A climate sensor uses 3 channels for temperature, humidity and light and 4 channels if CO2 is added. The hydroponic kit only uses 3 of the 4 channels for pH, EC and temperature.

What is the maximum sensor cable length?
GC-ProXL sensor cables can be extended up to 2000 feet from the controller. Inexpensive 15, 25, 50 & 100 foot extension cables are available from Agrowtek. Sensor signals are immune to noise or loss over vast distances.

Can I change the display units?
The controller can be configured to operate with temperature units of °C/°F, conductivity units of mS/cm2, uS/cm2, TDS ppm (500/640/700 factor,) and the aux inputs can even be custom scaled to any industrial 4-20mA sensor to monitor and control nearly any parameter!

How do I control equipment?
The GC-ProXL comes standard with sixteen (16) 24VDC outputs. These outputs can be connected to Agrowtek's RX/CX/RD series of relays and contactors for safe, reliable control of line-voltage loads. Alternately, relays can be purchased to be wired directly into your existing electrical infrastructure.

Do I need an extra power supply?
The GC-ProXL has provisions for an alternate 24VDC power supply to operate the output devices. This is necessary when the controller is wired to devices other than Agrowtek's RX/CX relays or AgrowDoseTM dosing pumps.

Includes only the controller, power supply and basic aspirated climate sensor.
Please select sensors and options:













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Copyright Agrowtek Inc. Sunday, 20 May 2018