Balanced Arm Misting Controller – Grizley – Instructions


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The Grizley Balanced Arm Misting Controller is excellent for controlling the watering or misting of crops. It is particularly suited to watering or misting young plants, seedlings or cuttings.

The controller provides an automatic watering or misting by using evaporation of the water on the “paddle” fitted to the controller. The ‘evaporation rate’ allows for the controller to water more in warmer periods and less in colder periods.  Dry conditions versus wet conditions also have an effect on the amount of waterings produced daily.

The Grizley Balanced Arm Misting Controller has no mercury tilt switch and relies on the stainless connections to complete the circuit making this controller much more robust and less likely to suffer damage than those using the glass mercury switch.  Furthermore, all parts used are either stainless steel, aluminium (the paddle) or plastic (the body of the unit) and the unit is made in New Zealand.

The ‘Pack’ includes the following:

  • 1 x Balanced Arm Misting Controller
  • 1 x Power Pack (12VDC)
  • 1 x Solenoid (20mm male threaded both sides)
  • 3 x Misting Nozzles

Controller Operation and Theory of Use:

The Grizley Balanced Arm Misting Controller should be sited on a level surface within the area that need to be irrigated.  It is important to try to have it placed ideally where the effects on it – particularly its ‘paddle’ are the same as for the majority of the crop that you wish to maintain.

When the Balanced Arm Misting Controller is operating its ‘paddle’ which is made from aluminium mesh catches water expelled from the watering or misting system’s nozzles and as this occurs the weight of the water accumulating on the paddle outweighs the weight on the counter balance of the controller’s arm and swings the arm down thus breaking the contact with an electrical fitting. On the breaking of the contact the circuit is broken and the solenoid closes ceasing watering or misting.

Evaporation then takes place which reduces the weight of water on the ‘paddle’ which in turn allows the arm rise due to its counter weights and the reduction in weight on the ‘paddle’.  As the arm rises it comes in contact with the electrical fitting again and on contact completes the circuit and turns the solenoid on, which in turn allows water to accumulate on the paddle again.

This process repeats and is effected by heat and air flow over the ‘paddle’ and thus over the crops. The unit allows the Grower to leave the crop unattended for short periods of time and it has been proven that automation far exceeds the care of the Grower when it comes to watering and misting on a regular basis.

The counter weight on the arm is slightly adjustable allowing for more or less water to accumulate on the ‘paddle’ before triggering.  The effect of this is that the Grower can control the amount and the duration of the waterings.  The unit comes with the standard ‘paddle’ however there is a larger one available should the Grower need it.


The solenoid is fitted with 20mm male threads on both the intake and outgoing lines.  This allows for the fitting of ‘hose tap’ fittings and garden hose should the Grower wish to use these.  If the Grower wishes to make a more permanent fitting the following applies:

  1. Fit an isolating valve to you incoming water line.
  2. To the isolating valve fit a 20mm PVC fitting or reduce to 16mm PVC fitting (you may use LDPE and the appropriate fittings instead of PVC)
  3. Run and connect the PVC or LDPE to the solenoid. Make sure that you connect the solenoid so that the water flow is in the correct direction (marked by arrow on solenoid)
  4. Fit the balance of the pipework including misters using 16mm or 19mm PVC or thinwall pipe. Misting nozzles should be placed in an upward position (not hanging) and preferably on risers otherwise some leakage can occur after irrigation has been completed.  Nozzles should be fitted level with each other to prevent drainage from the system through the nozzle mounted at the lowest point.
  5. Turn water on at isolating valve and check for leakage.


  1. The transformer (power pack) should be placed where it can be inserted into the power point. (An RCD could also be fitted prior to the transformer). DO NOT PLUG THE TRANSFORMER IN AT THIS STAGE
  2. The Controller should be placed LEVEL where it receives an indicative amount of flow from the mister nozzles, and should be free from breeze and clear of foliage.
  3. Connect one of the wires of the 12VDC outlet cable to one of the wires coming from the transformer (it does not matter which colour) and connect the other end of this to one of the wires on the solenoid (it must be the same wire)
  4. Connect a further 12VDC outlet cable to the other wire coming from the solenoid and run this wire to the Balanced Arm Controller and connect to wire on controller (it does not matter which colour)
  5. Connect the other wire mentioned in 5. To the other connection / wire on the controller and connect the other end of this wire to the other wire on the transformer.
  6. IMPORTANT: Check all wires. Basically one wire comes directly from the controller to the transformer and the other wire is going from the transformer to the solenoid and from the solenoid to the controller.
  7. The unit is now ready to be connected to the 230VAC power supply.

Operating and Adjustment:

  1. The ‘paddle’ initially will be dry and the arm will be in the upward position. The counter weights on the other end of the arm should be adjusted so that the arm just rests on the ‘Top Stop’. Too little adjustment will prevent the arm making contact with the ‘Top Stop’ and the unit will not operate and too much adjustment will result in the arm not moving off the ‘Top Stop’ even after the ‘paddle’ is fully wet.  When the paddle is dry it should slowly return to the ‘Top Stop’
  2. Complete adjustment of the arm as above and then turn water and power supply on.
  3. You should then monitor the controller making sure that it is turning on and off the solenoid valve as the ‘paddle’ gets wet and then dries.
  4. A slight adjustment is available to the Grower to allow less or more water in an irrigation cycle by adjusting SLIGHTLY the counter weights.
  5. No maintenance is necessary however it is important to monitor the correct operation and a regular check of wiring, water connections and contact areas


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