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Fertigation Bench

We can develop a system proposal for you to encompass all your needs and typically provide you more control and monitoring options than you may already have.
A typical System Proposal includes:
• System layout diagram and description • Technical performance specifications • Components list • Brief of discussions • Terms and conditions • Installation schedule • System Principle Discussion • Optional Items presentation • Pricing summary and detailed • Consumable items list & description • Support service details • Estimate parameters
Typical Optional Components
• Run off monitors • Temperature monitors • Chemigation • Output module controller • Water pretreatment systems • Run off Remix Systems • Run off treatment systems • Fogging systems • Plant Raising systems • Drippers, drip tape • PVC and PE pipe and fittings
The Nutridose II i is a computerized, feature packed, in-line fertigation controller for up to 30 irrigation zones. Each of the 30 zones can have its own solar integrator, which may be modified for temperature, relative humidity and, in the case of outside zones, wind and rain. For straight fertigation, the controller doses A and B Nutrients and pH corrector using a closed loop, feedback method. When used in this way it can be programmed to select the nutrient mix from one of two sets of stock tanks. This allows different zones to receive a different mix or even the same zone can be given a different nutrient mix day and night. Alternatively, the controller will dose up to four nutrients and/or additives on a volumetric, timed or bulk basis. Injection modes:- Feedback: The EC and pH are measured and the measured values are used to adjust the injection rates. This is the normal mode for hydroponic systems. Volumetric: This uses inputs from two flow meters, one measuring the main water flow and the other the injected additive flow. The controller continuously adjusts the additive flow to obtain the desired ratio of additive to water. This mode is mainly used for additives such as Pyrosol, fungicides etc. A separate flow meter is required for each output that uses the volumetric method. Bulk Timed: This method avoids the need for two flow meters and instead switches on an injection pump for a fixed length of time at the start of each zone irrigation. This allows each zone to receive a different amount of the additive and also flushes the line with water after the injection has finished. The user enters the injection time for each block in minutes and seconds. Bulk Quantity: This method allows the user to enter the quantity of additive required per zone in litres. The controller is also programmed with the quantity of water for irrigating each block. It then works out and controls the necessary injection rate to achieve this within the zone irrigation time and allows some time for flushing the line. The injection into the line is by proportional (0..10V), pulse proportional (PWM), stroke frequency or simple on/off means. This allows the injection to be performed by variable speed dosing pumps, proportional valves, venturi/ solenoid (pwm), stroke frequency pumps or a simple on/off pump. Each of these methods has cost, benefit and accuracy implications and the desired method should be carefully considered. Autogrow will be pleased to discuss these requirements for specific applications and can provide all ancillary equipment if required.		The controller can be configured for either direct in-line injection or for turbulent mixing tank operation. When used with a mixing tank, the controller has additional functionality to ensure that the mixing tank is pre-filled and dosed BEFORE irrigation commences. This gives high accuracy from the very start of the irrigation cycle. The controller may be connected to a PC computer for setting, data logging and alarms. The PC provides a very user-friendly interface although it is possible to set and use the controller completely stand-alone. The PC interface also provides remote alarms and data/ event logging. The PC interface is highly recommended as it provides much more information to the grower and also a much simpler interface. The same software, interface and cable can also be used to connect to other Autogrow control and monitoring devices. Input modules:- The inputs used will depend on the type of operation required. For instance, if some zones are out in the open then an external weather-station is required. If some irrigation zones are inside a greenhouse then an internal environment sensor system is needed. If an environment controller such as the AutoVent 2 is installed then the NutriDose II can get all of its information regarding both inside and outside conditions from the controller and no additional sensors are required.If volumetric ratio injection is required or if the user requires monitoring of water and/or chemical usage then a water meter and/or fert flow meters together with a meter interface module is required. If feedback injection is required then a nutrient sensor module with siphon break is required. Outputs:- 4 dosing outputs by proportional (0..10V) or three outputs by pulse proportional (PWM), stroke frequency or on/off. Note: proportional and pulse proportional outputs may be mixed but there remains a maximum of four outputs in total. The pulse proportional method works as follows:- Within a fixed cycle time (eg 8 seconds) the injection is on for part of the time and off for the remainder of the cycle time. For example, for a low EC, the injector might be on for say 2 seconds and then off for 6. For a higher EC, the injectors might be on for 6 seconds and off for 2. For good mixing this type of injection should be done before the main irrigation pump and an additional mixer such as the Autogrow “micro mixer” may be used between the injection points. If a turbulent mixing tank is used then additional mixing is unnecessary.