Q20 Square Capacitive Proximity Switch

Name: Q20 Square Capacitive Proximity Switch
Brand: DAIDISIKE
SKU: q20-square-capacitive-proximity-switch
Availability: InStock

Square-housing capacitive proximity switch, 10mm sensing distance, NPN/PNP NO/NC, for non-metal detection.

Q20 Square Capacitive Proximity Switch - product photo

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Technical Specifications

Sensing method	Capacitive
Housing shape	Square Q20
Output type	NPN / PNP
Contact logic	Normally Open (NO) / Normally Closed (NC)
Mounting type	Flush; T suffix = non-flush
Sensing distance	10 mm
Wiring	3-wire (DC)

Overview

The Q20 is a compact square-body capacitive proximity switch designed for non-contact detection of both metallic and non-metallic materials at a fixed 10 mm sensing range. Unlike inductive sensors that only respond to metal, capacitive sensing detects any target with sufficient dielectric constant, making it suitable for machine builders and panel integrators who need to sense liquids, granular solids, plastics, wood, or glass inside industrial equipment, tanks, or conveying lines.

It is offered in flush (standard) and non-flush ("T" suffix) mounting variants, and in NPN or PNP output with either normally-open (NO) or normally-closed (NC) logic, so it can be matched to common PLC input configurations. Wiring is 3-wire DC, and the model number itself encodes the configuration: sensing distance, output transistor type, contact logic, and mounting style.

Features & Benefits

Detects non-metallic targets that inductive sensors miss

Capacitive sensing responds to plastic, liquid, powder, wood, and glass, not just metal, letting integrators use one sensor family across mixed-material detection points.

Compact square Q20 housing simplifies panel mounting

The square body suits flat-panel or bracket mounting layouts common in machine frames and conveyor guards.

10 mm sensing distance for through-wall and close-range detection

A fixed 10 mm range suits applications such as sensing liquid or material presence through a thin non-metallic container wall, or short-range object detection.

NPN/PNP + NO/NC combinations match common PLC wiring

Four standard output variants (Q2010N1, Q2010P1, Q2010N2T, Q2010P2T) let integrators choose sinking or sourcing logic and normally-open or normally-closed contact behavior without custom wiring.

Flush and non-flush mounting options

The standard Q2010 series is flush-mountable and can be embedded level with a metal panel, while the "T"-suffix variant is non-flush, giving installers flexibility depending on surrounding panel material.

3-wire DC connection for standard industrial control voltages

Three-wire DC output simplifies wiring into typical control circuits alongside other proximity sensors in the same panel.

Applications

Liquid level sensing through a non-metallic tank wall — Capacitive sensing can penetrate a thin non-metallic wall to detect the presence of liquid inside a plastic or glass container.

Granular or powder material presence detection in hoppers and chutes — The sensor responds to loose granular or powder materials with sufficient dielectric constant, making it suitable for material-presence detection in hoppers and chutes.

Plastic, wood, or glass part detection on production lines — These non-conductive materials cannot be detected by inductive sensors, but the Q20's capacitive sensing responds to them directly.

Panel-flush installation on metal machine frames — The standard Q2010 flush variant can be embedded level with a metal machine frame surface, saving installation space.

Bracket-mounted detection near surrounding metal — The non-flush "T" variant suits bracket-style installations where surrounding metal would otherwise affect a flush-mounted sensor.

General non-contact object presence detection in automation panels — A fixed 10 mm sensing distance and NPN/PNP output options let the Q20 serve as a general-purpose presence sensor at common PLC input points.

Models & Ordering Information

Q20 Series (10 mm sensing distance)

Q2010N1Q2010P1Q2010N2TQ2010P2T

Naming rule: Q2010 + N/P (NPN/PNP) + 1/2 (NO/NC) + optional T (non-flush). Q2010N1/P1 are flush-mount NO models; Q2010N2T/P2T are non-flush NC models.

How to Select

Choose output transistor type by PLC input polarity: N = NPN (sinking output, for sinking-type PLC input cards), P = PNP (sourcing output, for sourcing-type PLC input cards).
Choose contact logic by control logic needs: model number "1" = normally open (NO, output conducts on target detection), model number "2" = normally closed (NC, output opens on target detection).
Choose mounting style by installation environment: no "T" suffix = flush mount (can be embedded in a metal panel); "T" suffix = non-flush mount, for use where surrounding metal could interfere with a flush-mounted sensor.
Sensing distance is fixed at 10 mm across all four Q20 models, so selection is determined only by output type, contact logic, and mounting style.
Q2010N1 (NPN, NO, flush), Q2010P1 (PNP, NO, flush), Q2010N2T (NPN, NC, non-flush), and Q2010P2T (PNP, NC, non-flush) are the four available configurations.

📘 Need the full method? How to Choose a Proximity Sensor · NPN vs PNP Sensor Outputs Explained

When NOT to specify the Q20 — and what to use instead

Dusty, humid, or condensing locations, or where buildup can form on the sensing face

Why not: Capacitive sensing (the principle this series relies on to detect non-metallic dielectric targets) is inherently sensitive to humidity, dust, and material buildup near the sensing face, which can cause false triggering.

Use instead: An inductive proximity sensor (e.g. the Q25/Q30/Q40 square series or the M8/M12/M18/M30 tubular series) for metal-only targets in dirty or condensing spots.

Needing a sensing distance other than 10mm

Why not: Sensing distance is fixed at 10mm across all four Q20 models, with no graded range option in this series.

Use instead: The RS series (M12/M18/M30 capacitive), which offers multiple sensing-range codes per thread size.

Machine guarding or personnel-safety interlocking

Why not: This is a standard presence-detection switch with no safety rating or safety category listed in its specifications.

Use instead: a dedicated safety interlock switch (e.g. the DX-series safety door switch) or a safety light curtain

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Operating/supply voltage range
Ingress protection (IP) rating
Operating temperature range
Switching frequency / response time
Housing material
Short-circuit and overload protection
Whether a sensitivity-adjustment / display version is offered
Certification status (CE/UL/RoHS, etc.)

Frequently Asked Questions

What is the sensing distance of the Q20 capacitive proximity switch?

The Q20 series has a fixed sensing distance of 10 mm, as specified for all four standard variants (Q2010N1, Q2010P1, Q2010N2T, Q2010P2T).

What output configurations are available for the Q20?

Four configurations are available: NPN normally-open (Q2010N1), PNP normally-open (Q2010P1), NPN normally-closed with non-flush mounting (Q2010N2T), and PNP normally-closed with non-flush mounting (Q2010P2T).

Can the Q20 detect non-metallic materials?

Yes. As a capacitive proximity switch, it uses capacitive sensing rather than inductive sensing, which allows it to respond to non-metallic targets such as plastic, liquid, powder, wood, and glass, in addition to metal.

What does the "T" suffix mean in the model number?

The "T" suffix denotes a non-flush mounting variant. Standard models without "T" (Q2010N1, Q2010P1) are flush-mountable.

Is the Q20 wired as 2-wire, 3-wire, or 4-wire?

The Q20 uses a 3-wire DC connection.

What housing shape does the Q20 use?

The Q20 uses a square housing, as indicated by its "Q" (square) product line designation and 20 mm nominal size class.

How do I choose between NPN and PNP output?

Match the output type to your PLC input card polarity: NPN (sinking) for sinking-type input cards, PNP (sourcing) for sourcing-type input cards. Check your PLC's input specification to confirm which type it requires.

Are certification documents available for the Q20?

Certification documents are available on request.