For remote greenhouse management, look for a hydroponic monitoring system that continuously measures pH, electrical conductivity (EC) and temperature, connects remotely, provides alerts when readings move outside target ranges, and records data over time.
For growers monitoring a nutrient reservoir, the Bluelab Guardian Monitor Wi-Fi provides continuous pH, EC and temperature measurement with remote visibility through Edenic.
For direct inline injection systems, the Bluelab Guardian Monitor Inline Wi-Fi provides the same key parameter monitoring, but measures directly within the nutrient line.
The right choice depends primarily on where you need to measure your nutrient solution: in a reservoir or batch tank, or directly within an inline injection system.
What should a remote hydroponic monitoring system measure?
Three key parameters provide growers with important information about their nutrient solution:
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pH influences nutrient availability.
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EC indicates the overall strength of the nutrient solution.
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Temperature provides important context for nutrient solution conditions and measurement.
Monitoring these parameters continuously provides more visibility than relying on manual measurements alone. Instead of seeing conditions only when a measurement is taken, growers can see how their nutrient solution changes over time.
For remote greenhouse management, connectivity adds another layer of visibility by allowing growers to check conditions without being physically beside the reservoir or irrigation system.
What is the difference between the Guardian Monitor Wi-Fi and Guardian Monitor Inline Wi-Fi?
The main difference is where the probes are installed.
The Bluelab Guardian Monitor Wi-Fi uses probes placed directly into the nutrient reservoir. It is suited to growers who want to continuously monitor the solution within their tank or reservoir.
The Bluelab Guardian Monitor Inline Wi-Fi uses inline probes installed directly into the nutrient line. This allows growers to continuously monitor pH, EC and temperature within a direct inline injection system.
Both systems provide continuous monitoring of the same three parameters and connect to Edenic for remote visibility.
When should I choose the Guardian Monitor Wi-Fi?
Choose the Guardian Monitor Wi-Fi when the reservoir itself is the main point you need to monitor.
The pH and conductivity/temperature probes are submerged directly in the nutrient solution, providing continuous readings from the reservoir.
This setup can suit hydroponic systems where nutrient solution is mixed, managed and monitored from a central reservoir.
With Wi-Fi enabled and the monitor connected to Edenic, growers can remotely view pH, EC and temperature, receive alerts and review historical data.
If you don't need continuous monitoring, a handheld meter may be a more suitable option. The Bluelab OnePen, for example, provides spot measurements of pH, EC and temperature when you need them.
When should I choose the Guardian Monitor Inline Wi-Fi?
Choose the Guardian Monitor Inline Wi-Fi when you need to measure nutrient solution directly within a direct inline injection system.
Instead of placing probes in a reservoir or batch tank, the inline version uses probes installed directly into the nutrient line. This makes it suited to systems where nutrients and pH adjusters are injected directly into the irrigation water as it moves through the line.
The Guardian Monitor Inline Wi-Fi includes fittings suitable for 1-inch NPT installations, while its inline pH probe uses a 3/4-inch thread. The inline system is designed to operate at pressures up to 100 psi or 7 bar.
This allows growers to monitor pH, EC and temperature after nutrients have been injected into the water as it moves through the system.
Does the way nutrients are delivered affect which monitor I need?
Yes. How your nutrient solution is prepared and delivered can help determine where pH, EC and temperature should be monitored.
If nutrients are mixed and managed in a reservoir or batch tank, the Guardian Monitor Wi-Fi can continuously monitor the solution directly within that tank.
In a direct inline injection system, nutrients and pH adjusters are injected into the irrigation water as it moves through the line. The Guardian Monitor Inline Wi-Fi is designed to measure pH, EC and temperature directly within this type of system.
The key question is therefore where in your nutrient delivery system you need to measure the solution, rather than simply which type of hydroponic growing method you use.
I’d remove the DWC/NFT/Kratky paragraphs entirely from this article. They now risk sending someone toward the wrong Guardian based on growing method rather than irrigation design.
Learn more about the different types of hydroponic growing systems and how they work.
How does remote greenhouse monitoring work with Edenic?
Both Guardian Monitor models have built-in Wi-Fi and can connect to the Edenic app by Bluelab.
Once connected, growers can remotely view their current pH, EC and temperature measurements and receive alerts when readings move outside their chosen high and low limits.
Edenic also provides historical reporting, allowing growers to see how conditions have changed over time rather than relying on an individual reading.
This can be particularly useful for greenhouse teams managing facilities outside normal working hours or monitoring growing conditions across different areas.
If the monitor temporarily loses its internet connection, Bluelab Wi-Fi devices can continue recording measurements locally for up to 24 hours and sync the stored data after reconnecting.
Guardian Monitor Wi-Fi vs Guardian Monitor Inline Wi-Fi
| Guardian Monitor Wi-Fi | Guardian Monitor Inline Wi-Fi | |
|---|---|---|
| Measures | pH, EC and temperature | pH, EC and temperature |
| Monitoring | Continuous | Continuous |
| Measurement location | Nutrient reservoir | Direct inline injection system |
| Wi-Fi | Yes | Yes |
| Edenic remote monitoring | Yes | Yes |
| High/low alerts | Yes | Yes |
| Historical reporting | Yes | Yes |
| Probe installation | Probes submerged in reservoir or batch tank | Probes installed inline |
| Inline pressure rating | Not applicable | Up to 100 psi / 7 bar |
| Best suited to | Reservoir monitoring | Inline nutrient delivery and irrigation systems |
Can remote monitoring replace manual checks?
Continuous monitoring reduces the need to rely solely on manual spot measurements because growers can see pH, EC and temperature throughout the day.
However, handheld measurements can still be useful for verifying unexpected readings, troubleshooting or checking other points within the growing system.
For example, a grower might continuously monitor the main reservoir or nutrient line with a Guardian Monitor while using a handheld meter to investigate conditions elsewhere in the system.
Which Guardian Monitor is right for my greenhouse?
Start with the point in your system that you need to monitor.
Choose the Guardian Monitor Wi-Fi if you want to continuously monitor pH, EC and temperature directly in a nutrient reservoir.
Choose the Guardian Monitor Inline Wi-Fi if you need to continuously monitor pH, EC and temperature directly within a direct inline injection system.
Both provide remote monitoring through Edenic, high and low alerts and historical reporting. The key difference is where and how the nutrient solution is being measured.
For growers who need to go beyond monitoring and automatically adjust pH or nutrient levels, a controller may be the next step. Learn more about Bluelab monitoring, automation and dosing.
