Blumat Digital – Soil moisture meter to know when to water

Blumat Digital – Substrate moisture meter to know when to water

Blumat Digital is a substrate moisture meter from the Austrian brand Blumat. It does not water: it is a diagnostic tool that measures how dry or wet the substrate is at the point where you stick the probe. Its reading works the opposite of what one might expect: the higher the value, the drier the substrate.

It is used for two things: to decide with criteria when it is time to water and, if you already have a Tropf-Blumat installation, to calibrate the sensors so that they open and close at the moisture level you want.

Key features

• Substrate moisture measurement: direct reading of the substrate condition at the measurement point.
• Inverse scale: high value = dry substrate; low value = wet substrate.
• Diagnostic tool: it tells you when to water, it does not water for you.
• Sensor calibration: helps to adjust the Tropf-Blumat sensors with data and not by eye.
• Austrian brand Blumat: same manufacturer as the capillary irrigation system.

How to use it

Stick the probe into the substrate, at the depth of the plant's root zone and near it, and read the value on the screen. Repeat the measurement at several points in the pot or the crop: the substrate does not dry out evenly and a single reading can be misleading.

Take note of what value the meter shows right after watering and what value it shows when the plant already asks you for water. Those two numbers are your reference: from there you know at what reading you want to water. If you have Tropf-Blumat sensors installed, use that same reference to adjust them until they open at the moisture level you have decided.

What is it compatible with?

Blumat Digital is only for diagnostics and is not part of the water circuit. It does not connect to any tube, it does not supply water and it does not replace an irrigation sensor. You can use it in any pot, grow table or soil, whether or not you have a Blumat installation.

It is especially useful as a complement to the Tropf-Blumat modular system, which works with two proprietary diameters that are not interchangeable: the Ø8 mm is the supply line and the Ø3 mm is the downpipe that goes from that line to the sensor. The meter does not use either of the two: it simply tells you if the setting point of your sensors is correct.

Technical specifications

• Brand: Blumat (Austria)
• Type: digital substrate moisture meter
• Function: diagnostics and calibration; does not water
• Reading: high value = dry substrate
• Use: pots, grow tables and soil
• Water circuit: it is not part of it; it does not connect to Ø8 mm or Ø3 mm tubing
• Presentation: unit

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1. Insert the probe into the growing medium to the depth of the root zone.
2. Place the probe near the plant, not at the edge of the pot.
3. Read the value on the display and remember that a high value means the growing medium is dry.
4. Repeat the measurement at several points in the crop, because the growing medium does not dry out evenly.
5. Record the value right after watering and the value when the plant is already asking for water.
6. Use that reference to decide when to water or to adjust your Tropf-Blumat sensors.