Q25 / Q30 / Q40 Square Inductive Proximity Sensors

Name: Q25 / Q30 / Q40 Square Inductive Proximity Sensors
Brand: DAIDISIKE
SKU: q25-q30-q40-square-inductive-proximity-sensors
Availability: InStock

Square-body 3-wire DC inductive proximity sensors, 10-20mm sensing distance, NPN/PNP, NO/NC, IP67-rated.

Q25 / Q30 / Q40 Square Inductive Proximity Sensors - dimensional drawing

🔍 Click to enlarge · 1/10

Technical Specifications

Detection method	Inductive
Housing shape	Square
Housing size (Q25)	25x25x35mm
Housing size (Q30)	30x30x38mm
Housing size (Q40)	40x40x53mm
Sensing distance (Q25/Q30)	10mm or 15mm
Sensing distance (Q40)	15mm or 20mm
Output type	NPN / PNP, NO / NC
Wiring	3-wire DC
Operating voltage	10-30VDC
Response time	0.5ms (1ms for Q40 20mm option)
Switching frequency	Up to 500Hz (300Hz for the longer sensing-distance option)
Housing material	PC
Protection rating	IP67
Maximum load current	150mA
Overload protection point	180mA
Short-circuit protection	Yes
LED indicator	Yes

Overview

The Q25, Q30 and Q40 are square-shaped inductive proximity switches that detect metallic targets without physical contact, using an internal oscillator/coil sensing field. They are non-contact, wear-free position/presence sensors intended for machine builders, panel integrators and industrial automation engineers who need a compact-format sensor, as an alternative to round M-thread barrel sensors, for detecting metal parts, machine components, or moving mechanisms in production equipment, conveyors, and control cabinets.

The series offers three square body sizes with sensing distance matched to size: Q25 (25x25x35mm) and Q30 (30x30x38mm) provide 10mm or 15mm sensing distance, while Q40 (40x40x53mm) provides 15mm or 20mm sensing distance. Every sensing-distance option is available in NPN or PNP output with normally-open (N1/P1) or normally-closed (N2/P2) switching, powered by 10-30VDC via a 3-wire DC connection, and housed in IP67-rated PC plastic with a built-in LED status indicator.

Features & Benefits

Three body sizes for flexible mounting

Q25 (25x25x35mm), Q30 (30x30x38mm) and Q40 (40x40x53mm) let engineers pick the footprint that fits their existing panel cutout or bracket without redesigning the mounting.

Sensing distance matched to body size

Q25/Q30 offer 10mm or 15mm sensing distance, and Q40 offers 15mm or 20mm, so a longer detection range is available by moving up to the larger housing.

NPN/PNP x NO/NC selectable output

Every sensing-distance option is available in NPN or PNP, normally-open (N1) or normally-closed (N2), covering the two most common industrial output logics.

3-wire DC wiring with color-coded leads

Powered by 10-30VDC, 3-wire connection (brown +, blue -, black signal for NPN/NO shown in the wiring diagram), simplifying field wiring and reducing installation errors.

IP67-rated, PC-body construction

Sealed to IP67 and housed in PC plastic, suited to environments with dust, splashing water, or coolant spray commonly found around production machinery.

Fast response for automation timing

Response time of 0.5ms (1ms for the Q40 20mm option) with switching frequency up to 500Hz (300Hz for the longer-range option), suitable for detecting fast-moving or cyclic mechanical motion.

Built-in LED indicator

Every model includes an LED status indicator, allowing on-site technicians to visually confirm switching state without an external tester.

Overload and short-circuit protection

Rated maximum load current of 150mA with a 180mA overload protection point and short-circuit protection, reducing the risk of sensor damage from field wiring mistakes or load faults.

Applications

Machine end-of-travel / limit detection — 3-wire NO/NC output connects directly into a PLC as a limit-switch signal, and non-contact detection avoids the mechanical contact wear of traditional limit switches.

Conveyor and material-handling position sensing — 500Hz switching frequency and 0.5ms response time allow the sensor to track fast-moving metal parts or pallets passing on a conveyor line.

Panel/enclosure flush-mounting into automation cabinets — The square housing fits flush into a panel cutout, saving mounting space compared with a cylindrical sensor.

Metal part presence/absence detection on production lines — The inductive sensing principle is designed specifically for metal targets, making it suitable for confirming whether a workpiece is in position.

Rotating or reciprocating mechanism position feedback — Non-contact operation eliminates mechanical wear, suiting mechanisms that cycle at high frequency over long periods.

Harsh or wet industrial environments — IP67 protection and PC housing withstand splashing water and dust commonly found around production machinery.

Replacing worn mechanical limit switches — Non-contact detection removes the mechanical-contact wear issue, making the sensor a suitable upgrade replacement for mechanical limit switches.

PLC digital input signal generation (NPN/PNP selectable) — NPN and PNP outputs match sink-type and source-type PLC input modules respectively, without requiring an extra conversion circuit.

Models & Ordering Information

Q25 series - 10mm sensing distance

Q2510N1Q2510P1Q2510N2Q2510P2

Q25 series - 15mm sensing distance

Q2515N1Q2515P1Q2515N2Q2515P2

Q30 series - 10mm sensing distance

Q3010N1Q3010P1Q3010N2Q3010P2

Q30 series - 15mm sensing distance

Q3015N1Q3015P1Q3015N2Q3015P2

Q40 series - 15mm sensing distance

Q4015N1Q4015P1Q4015N2Q4015P2

Q40 series - 20mm sensing distance

Q4020N1Q4020P1Q4020N2Q4020P2

Response time 1ms and switching frequency 300Hz on this option, versus 0.5ms/500Hz on the other sensing-distance options.

How to Select

Need 10mm sensing distance -> choose Q25 or Q30 series.
Need 15mm sensing distance -> all three series (Q25/Q30/Q40) offer this option.
Need 20mm sensing distance, the longest of the three series -> choose Q40 series.
Small installation space or tight panel cutout -> choose Q25 (25x25x35mm).
Medium installation space -> choose Q30 (30x30x38mm).
Ample installation space and need for a longer sensing distance -> choose Q40 (40x40x53mm).
PLC input is sink-type -> choose an NPN model (model number contains 'N', e.g. Q2510N1).
PLC input is source-type -> choose a PNP model (model number contains 'P', e.g. Q2510P1).
Need output ON when target is detected (normally-open logic) -> choose the N1/P1 suffix (NO).
Need output OFF when target is detected (normally-closed logic, e.g. for safety interlocks) -> choose the N2/P2 suffix (NC).
All three series are powered by 10-30VDC via a 3-wire DC connection; confirm the field supply voltage falls within this range.
Model number reading example: Q2510N1 = Q25 series + 10mm sensing distance + NPN output + normally-open (NO).

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

When NOT to specify the Q25 — and what to use instead

Detecting plastic, liquid, or other non-metallic targets

Why not: Q25/Q30/Q40 are inductive sensors that detect metallic targets only, using an internal oscillator/coil sensing field.

Use instead: A capacitive proximity sensor such as the Q20 square capacitive switch or the RS series.

Mounting into a cutout or fixture smaller than 25x25x35mm

Why not: Q25 is the smallest body in this family at 25x25x35mm; none of the three sizes fit a smaller envelope.

Use instead: A smaller square series (e.g. Q08, Q10, or Q17/Q18C) or a threaded M8/M12 tubular sensor for tighter installation spaces.

Switching a load directly above the rated output current

Why not: Maximum load current is rated at 150mA with a 180mA overload protection point, per the spec table.

Use instead: Drive the load through an interposing relay or contactor rated above 150mA instead of wiring it directly to the sensor output.

Sensing aluminum, brass, or copper targets at the rated distance

Why not: No non-ferrous correction factor is published in the current spec table for this series.

Use instead: Confirm the correction factor with the factory before specifying for non-ferrous metal targets.

Machine guarding or personnel-safety interlocking

Why not: This is a standard non-contact position sensor 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.

Non-ferrous correction factor
MTBF (mean time between failures)
Cable length / connector type
Certification status (CE/UL/RoHS, etc.)

Frequently Asked Questions

What is the sensing (detection) distance of the Q25, Q30 and Q40 series?

Q25 and Q30 offer 10mm or 15mm sensing distance; Q40 offers 15mm or 20mm sensing distance, as listed in the model list.

What output configurations are available?

Each sensing-distance option is available in four output configurations: NPN normally-open (N1), NPN normally-closed (N2), PNP normally-open (P1), and PNP normally-closed (P2).

What is the operating voltage and wiring configuration?

The sensors operate on 10-30VDC and use a 3-wire DC connection (brown = +, blue = -, black = signal, per the standard wiring diagram for the NPN/NO configuration).

What is the housing material and ingress protection rating?

The housing is PC (polycarbonate) plastic, rated IP67 for protection against dust and temporary water immersion/splashing.

What is the difference between the Q25, Q30 and Q40 body sizes?

They are square-body inductive sensors of increasing size - Q25 (25x25x35mm), Q30 (30x30x38mm), Q40 (40x40x53mm) - with larger bodies enabling a longer sensing distance option.

Does the sensor include a status indicator?

Yes, all models include a built-in LED indicator for visual confirmation of the switching state.

What is the maximum switching frequency and response time?

Response time is 0.5ms for most sensing-distance options (1ms for the Q40 20mm option); switching frequency is up to 500Hz for the shorter sensing-distance options and 300Hz for the longer ones.

Is short-circuit or overload protection included?

Yes, the sensors include short-circuit protection and an overload current protection point of 180mA, with a maximum rated load current of 150mA.

How do I read the model number, e.g. Q2510N1?

Q25 = body series, 10 = 10mm sensing distance, N = NPN output, 1 = normally-open (NO). Full naming rule: series + sensing distance(mm) + N/P (NPN/PNP) + 1/2 (NO/NC).

Works Well Together

On the same machine or line, Q25 is typically ordered together with: Photoelectric Sensors · Relay & Timer Modules · Laser Switch Sensors

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