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Gateway is not counting pulses (sensor is not detecting pulses)

Posted
Updated
ByRoel van Wanrooy

If your gateway is no longer counting pulses, it’s usually either a sensor/detection issue or a wiring/configuration issue. Follow the steps below from quick checks to deeper troubleshooting.

Step 1: Check whether the sensor is still working

A) Yellow inductive sensor (3-wire)

  1. Hold metal in front of the black round spot on the sensor.
  2. Check whether the red LED turns on when metal is detected.
  • Red LED turns on when detecting? → Go to Step 2.
  • Red LED does not turn on? → Check the sensor itself (power/defective sensor/cable) or test with another sensor.

Step 2: Check the connection to the gateway (wiring)

Important: never swap the wires. One wire in the wrong position can cause the gateway to stop detecting pulses or could damage the gateway!

A) Inductive (yellow) 3-wire sensor — correct wiring

  • 12V → brown
  • GND → blue
  • S1 → black

Verify that they are connected exactly like this. If needed, disconnect the wires and reconnect them properly.

B) Reed sensor (magnetic) — 2-wire connection

  1. Check that the 2 wires of the reed sensor are connected correctly to the gateway.
  2. Make sure the reed sensor is connected to:
    • 12V
    • S1

Never connect GND to a 2-wire sensor.
GND should only be used for sensors that are designed for it (such as the 3-wire inductive sensor).

If the wiring is correct, go to Step 3.

Step 3: Check in the gateway log whether pulses are being counted

  1. Open the gateway log page:
    https://smartgateways.nl/en/kb/view-gateway-log/
  2. Wait until the gateway is connected to Wi-Fi (your IP address should be shown in the log).
  3. Find the section where pulse/counting is displayed.

Pay attention to:

  • Are value and factor set correctly?
  • Were these values entered as intended for your sensor/application?

Examples and correct settings are provided in the installation guide:
https://smartgateways.nl/en/support/

If value or factor are not filled in correctly, it may look like no pulses are being counted, or the counts may be calculated incorrectly. Value and factor must always be filled in.

Step 4: Test again with metal/magnet + log check

Inductive sensor (yellow)

  1. Hold metal again in front of the black spot.
  2. Check whether the gateway log shows pulses/values changing.

Reed sensor (magnetic)

  1. Test with a magnet on the reed sensor.
  2. Check the gateway log again to confirm that pulses are actually being registered.

Step 5: Improve positioning/alignment

If everything is wired correctly but you still don’t get proper readings:

  • Reposition the sensor on the meter so it is as close as possible to the metal or magnet.
  • Even small distance changes can cause the sensor to switch inconsistently (or not at all).

Quick checklist

  •  The log value/pulse count changes during the test
  •  Sensor works: LED on when metal is present / reed switches with a magnet
  •  Inductive sensor wiring: 12V = brown, GND = blue, S1 = black (never swap)
  •  Reed sensor wiring: 12V and S1 connected, no GND on a 2-wire sensor
  •  In the log: value and factor entered correctly
  •  Sensor repositioned (as close as possible to metal/magnet)
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