PART VCalibration
CHAPTER 20

Calibrating the sensors

All the automation decides on top of what the sensors say — and a good sensor is a calibrated sensor. The calibration centre lives in System → Calibration: one button per calibratable sensor, each with the step-by-step right on its screen.

The calibration centre: one button per detected sensor.
The calibration centre: one button per detected sensor.

20.1 pH

Use two solutions, the closest to the range you want to measure: for pH above 7.0 (a marine aquarium), the 7.0 and 10.0 solutions; for pH below 7.0, the 4.0 and 7.0 solutions.

  1. Start with the low point: place the temperature sensor and the pH probe in the first solution and wait 5 to 10 minutes to stabilise.
  2. Set the solution's value in the field and tap Calibrate Low Point.
  3. Rinse the probe under running water, immerse it in the second solution, and wait again.
  4. Set the value and tap Calibrate High Point.

The screen shows the live reading — and, on Aquarino probes, also the slope, the probe's health indicator.

20.2 ORP

ORP accepts a single-point calibration — the high point — with a 225 mV or 400 mV solution. Immerse the probe, wait 5 to 10 minutes, enter the value and calibrate. If you want more accuracy, do two points, starting with the low one.

20.3 Conductivity (EC)

Use two solutions: 12,880 µS/cm for the low point and 53,000 µS/cm for the high point — the ideal pair for marine water. The procedure is the same as for pH: temperature sensor alongside, 5 to 10 minutes of stabilisation per point, running water between one solution and the next.

20.4 TDS

Use 84 µS/cm for the low point and 1,413 µS/cm for the high point — the right pair for monitoring reverse-osmosis water. Same ritual as EC.

20.5 Oxygen (SAT/DO)

The simplest one: leave the probe exposed to the air for 5 to 10 minutes and tap Calibrate High Point. Air is the 100% saturation reference.

20.6 Temperature

Temperature sensors calibrate by offset: place a reference thermometer in the water, wait for it to stabilise, and adjust the difference (−1.0 to +1.0 °C) until the readings match.

20.7 Flow

Calibrating the flow sensor means choosing the model: select yours (DN15, DN20, DN25, DN32, DN40) and the correct factor is applied. Afterwards, if you want, fine-tune the factor against a real measurement.

20.8 Failover (voltage)

  1. Keep the Failover's network cable connected to the hub and disconnect the module's power cable. Wait 5 minutes and calibrate the low point as zero.
  2. Reconnect the power and calibrate the high point with your mains voltage (110 to 240 V) — if you have a multimeter, use the measured value.