RS Series M12/M18/M30 Capacitive Proximity Sensor (ABS Plastic Housing)

Name: RS Series M12/M18/M30 Capacitive Proximity Sensor (ABS Plastic Housing)
Brand: DAIDISIKE
SKU: rs-series-m12-m18-m30-capacitive-proximity-sensor
Availability: InStock

M12/M18/M30 threaded capacitive proximity sensors in ABS housing, detecting metallic and non-metallic targets alike.

RS Series M12/M18/M30 Capacitive Proximity Sensor (ABS Plastic Housing) - product photo

🔍 Click to enlarge · 1/17

Technical Specifications

Sensing Method	Capacitive
Thread Size	M12 / M18 / M30
Housing	ABS plastic
Output Type	NPN / PNP, NO / NC
Mounting Type	Flush; T suffix = non-flush
Sensing Range Codes	M12: 02/03/04/06; M18: 05/08/15; M30: 10/20/15/30
Wiring	3-wire (DC)
Material	ABS plastic housing

Overview

The RS series is a capacitive-type proximity sensor: it detects the change in capacitance caused by a target entering its sensing field, which allows it — unlike inductive proximity sensors — to sense non-metallic materials (liquids, granules, powders, plastics, wood, glass) as well as metals. Each sensor threads into an M12, M18 or M30 mounting hole and is housed in ABS plastic rather than metal.

The series is offered in NPN or PNP output, each with NO (normally-open) or NC (normally-closed) switching, and in flush-mount or non-flush-mount (T-suffix) body styles, all wired as 3-wire DC. It suits machine builders and process-equipment integrators who need a threaded, panel-mountable sensor to detect material level, presence, or position of non-metallic or metallic targets — e.g. level sensing in plastic tanks/hoppers, detecting objects through a non-metallic wall, or general presence detection where inductive sensing cannot see the target.

Features & Benefits

Detects non-metallic and metallic targets alike

Because sensing relies on a capacitance change rather than eddy currents, the RS series can detect liquids, powders, granules, plastics, wood and glass, in addition to metal, extending its use beyond what an inductive proximity sensor can sense.

Three thread sizes — M12, M18, M30 — for different mounting and range needs

A common product family covers small panel-mount installations (M12) up to larger housings with correspondingly greater sensing range (M30), letting an integrator standardize on one series across different equipment sizes.

NPN and PNP output, each with NO and NC logic

Every thread size is available in NPN or PNP switching, and in normally-open or normally-closed configuration, so the sensor can be matched to the sinking or sourcing input type of the customer's PLC/controller and to the required fail-safe logic without needing a different sensor family.

Flush and non-flush mounting options within the same series

Standard part numbers are flush-mount (embeddable, side shielding tolerant); T-suffix part numbers are non-flush mount, allowing selection based on how the sensor will be installed relative to surrounding material.

3-wire DC wiring

All variants use a 3-wire DC connection, a standard wiring scheme compatible with common industrial DC control circuits.

ABS plastic housing

The housing is molded ABS plastic rather than metal, an alternative construction to the metal-housing capacitive series in this product line for applications where a non-metallic housing is preferred.

Multiple sensing-range codes per thread size

Each thread size offers several range-code variants (M12: 02/03/04/06; M18: 05/08/15; M30: 10/20/15/30, per the part-number series), giving a choice of nominal sensing distance within the same mounting size before the exact mm figures are confirmed with the factory.

Applications

Liquid level detection in plastic tanks or hoppers — Capacitive sensing can detect liquid or bulk material through a non-metallic wall, which an inductive sensor cannot do.

Powder, granule or pellet level/presence sensing in process equipment — The sensing principle responds to non-metallic bulk materials, suiting hopper and silo level applications.

Non-metallic object presence detection on production lines — Detects plastic, wood, or glass parts that inductive proximity sensors cannot sense.

General object/position detection alongside metal targets — Also responds to metallic targets, so it can serve as a general-purpose proximity sensor where either metal or non-metal targets may be present.

Panel-mount detection in equipment sized for M12/M18/M30 mounting holes — Threaded body in three standard sizes fits common industrial mounting-hole diameters without custom brackets.

Retrofitting inductive-sensor mounting positions for non-metal targets — Same M12/M18/M30 thread sizes as common inductive sensors allow mechanical drop-in at existing mounting points when the target material changes to non-metal.

Models & Ordering Information

M12 Series

RS1202N1RS1202P1RS1202N2RS1202P2RS1203N1RS1203P1RS1203N2RS1203P2RS1204N1TRS1204P1TRS1204N2TRS1204P2TRS1206N1TRS1206P1TRS1206N2TRS1206P2T

Range codes 02/03 are flush-mount; range codes 04/06 are non-flush mount (T suffix).

M18 Series

RS1805N1RS1805P1RS1805N2RS1805P2RS1808N1RS1808P1RS1808N2RS1808P2RS1808N1TRS1808P1TRS1808N2TRS1808P2TRS1815N1TRS1815P1TRS1815N2TRS1815P2T

Range code 05 is flush-mount only; range code 08 is available in both flush and non-flush (T suffix); range code 15 is non-flush mount only.

M30 Series

RS3010N1RS3010P1RS3010N2RS3010P2RS3020N1RS3020P1RS3020N2RS3020P2RS3015N1TRS3015P1TRS3015N2TRS3015P2TRS3030N1TRS3030P1TRS3030N2TRS3030P2T

Range codes 10/20 are flush-mount; range codes 15/30 are non-flush mount (T suffix).

How to Select

By thread size (M12/M18/M30): choose based on the equipment's mounting hole diameter and required sensing range — larger threads generally offer larger range codes (e.g. M30 offers 10/20/15/30 codes, M12 offers 02/03/04/06 codes).
By sensing range code: the two digits in the part number are a range code (e.g. RS1202 = M12/code 02, RS3030 = M30/code 30); the exact mm sensing distance for each code is pending confirmation from the factory, so request the code-to-distance table when selecting.
By output type (N/P): N = NPN, P = PNP in the part number; choose according to the sinking (NPN) or sourcing (PNP) input type of the site PLC/controller.
By switching logic (1/2): 1 = normally-open (NO), 2 = normally-closed (NC) in the part number; choose according to whether the control logic requires the contact to close or open on target detection.
By mounting type (flush/non-flush): part numbers without a T suffix are flush-mount; part numbers ending in T are non-flush mount — choose based on whether metal/material shielding surrounds the sensor and the required installation depth.
Part-number key: RS + thread size (12/18/30) + range code + N/P (NPN/PNP) + 1/2 (NO/NC) + [T for non-flush]. Example: RS1805N1 = M18 thread, range code 05, NPN output, normally-open, flush mount.

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

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

Dusty, humid, or condensing locations, or spots prone to material buildup 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 buildup near the sensing face, which can cause false triggering.

Use instead: A tubular M12/M18/M30 inductive proximity sensor (e.g. the M8/M12/M18/M30 DC 2-wire series) for metal-only targets in contamination-prone locations.

Needing the exact millimeter sensing distance for a given range code before finalizing a design

Why not: The exact mm sensing-distance value for each range code (e.g. M12 02/03/04/06, M18 05/08/15, M30 10/20/15/30) is explicitly listed as pending confirmation from the factory.

Use instead: Request the current code-to-distance table from the factory before finalizing the sensing gap in the mechanical design.

Machine guarding or personnel-safety interlocking

Why not: This is a standard presence/level-detection 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.

Exact millimeter sensing distance for each range code (M12: 02/03/04/06; M18: 05/08/15; M30: 10/20/15/30)
Operating/supply voltage range
Ingress protection (IP) rating
Operating temperature range
Response/switching frequency
Short-circuit and overload protection
Cable length
Certification status (CE/UL/RoHS, etc.)

Frequently Asked Questions

What is the difference between a capacitive proximity sensor and an inductive proximity sensor?

A capacitive sensor detects targets by sensing a change in capacitance as an object enters its sensing field, which allows it to detect non-metallic materials (liquids, powders, plastics, wood, glass) as well as metal. An inductive sensor, by contrast, only responds to metallic targets via eddy-current induction.

What thread sizes are available in the RS series?

The RS series is available in M12, M18 and M30 threaded sizes.

What output types does the RS series offer?

Each thread size is available in NPN or PNP output, each further offered in normally-open (NO) or normally-closed (NC) switching logic.

What is the difference between flush and non-flush mount versions?

Standard part numbers (no suffix) are flush-mount type; part numbers with a "T" suffix are non-flush mount type. The mounting type should be selected based on the sensor's installation position relative to surrounding material.

What is the wiring configuration of the RS series?

All variants use a 3-wire DC connection.

What is the housing material of the RS series?

The housing is molded ABS plastic, as distinct from the metal-housing capacitive proximity sensors in the same product line.

Can the RS series detect liquid inside a plastic container?

Capacitive sensing can detect liquid or bulk material through a non-metallic container wall, which is a characteristic of the capacitive sensing principle; exact detection performance depends on target material and installation, and should be confirmed against the sensing-range specification for the chosen model.

How do I read an RS series part number, e.g. RS1805N1?

RS = capacitive proximity sensor series; 18 = M18 thread; 05 = sensing-range code; N = NPN output; 1 = normally-open (NO); no T suffix means flush mount.

What is the exact sensing distance in mm for each range code?

The exact millimeter sensing-distance values for each range code (e.g. M12 codes 02/03/04/06, M18 codes 05/08/15, M30 codes 10/20/15/30) are pending confirmation from the factory.

What supply voltage does the RS series require?

The RS series uses a 3-wire DC connection; the exact operating voltage range is pending confirmation from the factory.

Can you provide certification documents for the RS series?

Certification documents are available on request.