{"id":6572,"date":"2026-10-16T17:20:44","date_gmt":"2026-10-16T17:20:44","guid":{"rendered":"https:\/\/plugplaykit.com\/?post_type=docs&p=6572"},"modified":"2026-10-16T17:20:47","modified_gmt":"2026-10-16T17:20:47","password":"","slug":"y28-non-contact-liquid-level-sensor-guide","status":"publish","type":"docs","link":"https:\/\/plugplaykit.com\/es\/docs\/y28-non-contact-liquid-level-sensor-guide\/","title":{"rendered":"Y28 Non-Contact Liquid Level Sensor: Selection, Wiring and Installation"},"content":{"rendered":"
\n

PPK-Y28 Non-Contact Liquid Level Sensor: Selection, Wiring and Installation<\/h2>\n

The PPK-Y28 is an external capacitive sensor for detecting a liquid level at one fixed point through a compatible non-metallic pipe or flat container wall. It is available here with a 5 V, 12 V, or 24 V DC supply and a relay output.<\/p>\n

Choose the right output<\/h2>\n\n\n\n\n\n\n
Option<\/th>\nWhen liquid is detected<\/th>\nAvailable supply<\/th>\n<\/tr>\n<\/thead>\n
Normally Open (NO)<\/td>\nThe relay NO contact closes.<\/td>\nDC 5 V, 12 V, or 24 V<\/td>\n<\/tr>\n
Normally Closed (NC)<\/td>\nThe relay NC contact opens.<\/td>\nDC 5 V, 12 V, or 24 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Select the supply voltage that matches the DC power available in your system. The manual lists a 2 A relay output for the NO\/NC versions. Confirm the connected load and all local electrical requirements before wiring a load.<\/p>\n

Check pipe diameter and wall thickness first<\/h2>\n

For non-metallic pipes, the outside diameter and wall thickness must be considered together. Pipes must have an outside diameter of at least 11 mm.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Pipe outside diameter<\/th>\nSpecified sensing wall or tube wall thickness<\/th>\n<\/tr>\n<\/thead>\n
100 mm or larger<\/td>\n20 \u00b1 3 mm<\/td>\n<\/tr>\n
80 to under 100 mm<\/td>\n15 \u00b1 2 mm<\/td>\n<\/tr>\n
60 to under 80 mm<\/td>\n12 \u00b1 1.5 mm<\/td>\n<\/tr>\n
40 to under 60 mm<\/td>\n7 \u00b1 1.0 mm<\/td>\n<\/tr>\n
30 to under 40 mm<\/td>\n5 \u00b1 1.0 mm<\/td>\n<\/tr>\n
20 to under 30 mm<\/td>\n3 \u00b1 1.0 mm<\/td>\n<\/tr>\n
10 to under 20 mm<\/td>\n1.5 \u00b1 0.5 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Use a flat, uniform, insulating non-metallic installation area. Keep metal parts away from the sensing area.<\/p>\n

Install the sensor<\/h2>\n
    \n
  1. Place the sensing sheet on the outside of the tank or pipe at the desired alarm point.<\/li>\n
  2. Attach it tightly with a suitable durable adhesive or secure it with a nylon tie for pipe installation.<\/li>\n
  3. Keep the gap between the sensing surface and the container wall below 0.5 mm; no gap is preferred.<\/li>\n
  4. Power the sensor, then adjust sensitivity only if detection is too weak or too strong for the installed container and liquid.<\/li>\n<\/ol>\n

    Wire the relay output<\/h2>\n

    Brown<\/strong> is DC positive, blue<\/strong> is DC negative, yellow<\/strong> is the signal output, and black<\/strong> is COM. For a PLC or MCU input, connect COM to GND for an NPN-style input or to VCC for a PNP-style input.<\/p>\n

    \"PPK-Y28-NC
    PPK-Y28-NC: the NC contact is on when no liquid is detected and opens when liquid is detected.<\/figcaption><\/figure>\n
    \"PPK-Y28-NO
    PPK-Y28-NO: the NO contact closes when liquid is detected.<\/figcaption><\/figure>\n

    Liquid and environment limits<\/h2>\n