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DADISICK · Photoelectric Sensors

DK-GF18 Series Square Photoelectric Sensors

A single 50 x 50 x 18 mm ABS housing, three sensing principles and two power platforms. 28 orderable models cover 30 mm diffuse detection through to 15 m through-beam, with a built-in AC/DC relay output that drives loads directly.

50 x 50 x 18 mm
CE
RoHS
IP55
IP65 on DC through-beam
0 °C to +55 °C

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DK-GF18 series square photoelectric sensor with mounting bracket and reflective board — Square ABS housing, red LED indication and cable connection. Reflective board shown with retro-reflective versions.

At a glance

One platform, 28 orderable configurations

50 x 50 x 18Housing in millimetres, ABS

3Sensing modes

28Orderable models

2Power platforms: DC and AC/DC

Why DK-GF18

Built for retrofits and mixed-voltage lines

01

AC/DC wide-voltage with relay output

12-240 V DC or 24-240 V AC supply and a built-in 5-wire relay rated 3 A / 30 V AC and 1 A / 220 V AC. Drives contactors, lamps or solenoid valves without an extra PLC output stage.

02

Four sensing ranges

Diffuse reflection at 30-500 mm and 30-1500 mm, retro-reflection at 30-4000 mm, and through-beam at 15000 mm. AC/DC diffuse versions cover 80-500 mm and 100-1500 mm.

03

Compact, sealed, certified

ABS housing with red LED indication, IP55 as standard and IP65 on the DC through-beam version, 0 °C to +55 °C operation, CE and RoHS conformity.

Specification groups

Six specification groups from the datasheet

Group	Series	Sensing distance	Supply	Output	IP	Models
A	DC 3-wire / 4-wire Diffuse Reflection	30-500 mm / 30-1500 mm, adjustable	10-30 V DC	NPN / PNP, NO / NC / NO+NC	IP55	12
B	DC 3-wire / 4-wire Retro-reflection	30-4000 mm, adjustable	10-30 V DC	NPN / PNP, NO / NC / NO+NC	IP55	6
C	DC 3-wire / 4-wire Through-beam	15000 mm	10-30 V DC	NPN / PNP, NO / NC / NO+NC	IP65	6
D	AC/DC 5-wire Relay Output Diffuse Reflection	80-500 mm / 100-1500 mm, adjustable	12-240 V DC / 24-240 V AC	Relay output, 5-wire	IP55	2
E	AC/DC 5-wire Relay Output Retro-reflection	30-4000 mm, adjustable	12-240 V DC / 24-240 V AC	Relay output, 5-wire	IP55	1
F	AC/DC 5-wire Relay Output Through-beam	15000 mm, adjustable	12-240 V DC / 24-240 V AC	Relay output, 5-wire	IP55	1

Group letters A-F refer to datasheet pages P3-P8. Every value above is taken from the DK-GF18 technical data sheet, revision dated 2026-04-20.

Technical parameters

DC transistor output versus AC/DC relay output

Parameter	DC 3-wire / 4-wire	AC/DC 5-wire relay
Operating voltage	10-30 V DC	12-240 V DC / 24-240 V AC
Output type	NPN / PNP transistor, NO, NC or NO+NC	Built-in relay, NO + NC
Maximum load current	150 mA	3 A / 30 V AC, 1 A / 220 V AC
No-load current	≤30 mA (diffuse), <15 mA (retro / through-beam)	≤20 mA
Voltage drop	<1.5 V	≤2.5 V
Leakage current	<0.01 mA	Not specified in the datasheet
Switching frequency	100 Hz	10 Hz
Response time	5 ms	20 ms
Short-circuit protection	Yes	Not specified in the datasheet
Overload protection point	300 mA	Not specified in the datasheet
Switching hysteresis	<15% (Sr)	<15% (Sr)
Repeat accuracy	<5% (Sr)	<5% (Sr)
Protection level	IP55, IP65 on through-beam	IP55
Working temperature	0 °C to +55 °C	0 °C to +55 °C
Standard detection object	200 x 200 mm white cardboard	200 x 200 mm white cardboard
Housing	50 x 50 x 18 mm, ABS	50 x 50 x 18 mm, ABS
Indicator	Red LED	Red LED
Certification	CE, RoHS	CE, RoHS

Light source: 850 nm infrared for diffuse reflection and through-beam, 940 nm infrared for retro-reflection. Standard detection object: 200 x 200 mm white cardboard. Short-circuit and overload figures are stated only for the DC versions in the datasheet.

Dimensions

Housing and reflector dimensions

DK-GF18 DC version dimension drawing showing 50 mm width, 50 mm height, 33 mm body and 18 mm thickness — DC versions: 50 x 50 mm face, 33 mm body depth, 18 mm thickness and Ø5 mm cable entry.

DK-GF18 AC/DC retro-reflective dimension drawing with reflector board measurements 61 mm, 50 mm, 14.5 mm, 24.5 mm and 7.5 mm — AC/DC retro-reflective version: sensor outline plus the supplied reflective board (61 x 50 mm, with 14.5 mm, 24.5 mm and 7.5 mm details).

Dimensions are for reference only; please refer to the actual measurement. Retro-reflective versions ship with a reflective board; through-beam versions ship as a transmitter and receiver pair.

Wiring

Wiring diagrams and wire assignments

DK-GF18 AC/DC 5-wire relay output wiring diagram with brown blue black gray and white wires — AC/DC 5-wire relay output: Brown, Blue, Black, Gray and White.

Wire colour	DC 3-wire	DC 4-wire	AC/DC 5-wire relay
Brown (1)	+10-30 V DC	+10-30 V DC	+12-240 V DC / 24-240 V AC
Blue (3)	0 V	0 V	0 V
Black (2 / 4)	Switched output to load	One switched output to load	NO contact
White (2)	Not used	Second switched output to load	NC contact
Gray	Not used	Not used	COM terminal

Datasheet note: Both AC and DC require 4 wires, NO or NC. Always confirm the wiring against the label of the model you receive before energising.

Part number guide

How to read a DK-GF18 part number

Example: DK-GF18-400NO-ZCA is a 4000 mm retro-reflective sensor with NPN NO output, cable connection and a 10-30 V DC supply.

Code	Meaning
DK-G	Photoelectric sensor series
F	General square type
18	Housing size 18 mm
400 / 50 / 150 / 1500	Detection distance code (4000 mm / 500 mm / 1500 mm / 15000 mm)
NO / NC / PO / PC / NS / PS / J	NPN NO, NPN NC, PNP NO, PNP NC, NPN NO+NC, PNP NO+NC, relay output
Z	Cable type connection (Y = plug-in type)
A / B / C after Z	Detection method: A diffuse reflection, B through-beam, C retro-reflection
Final A / B	Voltage: A 10-30 V DC, B 12-240 V DC / 24-240 V AC

DK-GF18 Series

DK-GF18 Series square photoelectric sensors in a 50 x 50 x 18 mm ABS housing. Three sensing modes (diffuse reflection, retro-reflection, through-beam), DC 3-wire / 4-wire NPN-PNP outputs and AC/DC 5-wire relay output, 28 orderable models, 30 mm to 15,000 mm sensing distance, IP55 / IP65, CE and RoHS. Full specification tables, dimension drawings and wiring diagrams are provided.

DK-GF18 Series	Model	Description
DK-GF18-400J-ZBB AC/DC Relay Output Through Beam Sensor, 15 m	DK-GF18-400J-ZBB	DK-GF18 AC/DC through-beam sensor, 15000 mm, 12-240 V DC / 24-240 V AC, relay output, IP55.
DK-GF18-400J-ZCB AC/DC Relay Output Retroreflective Sensor, 4000 mm	DK-GF18-400J-ZCB	DK-GF18 AC/DC retro-reflective sensor, 30-4000 mm, 12-240 V DC / 24-240 V AC, relay output, IP55.
DK-GF18-50J-ZAB AC/DC Relay Output Diffuse Photoelectric Sensor, 80-500 mm	DK-GF18-50J-ZAB	DK-GF18 AC/DC diffuse sensor, 80-500 mm, 12-240 V DC / 24-240 V AC, 5-wire relay output, IP55.
DK-GF18-1500NO-ZBA Through Beam Photoelectric Sensor, 15 m, NPN NO	DK-GF18-1500NO-ZBA	DK-GF18 through-beam photoelectric sensor, 15000 mm, 10-30 V DC, NPN NO, IP65, CE and RoHS.
DK-GF18-400NO-ZCA Retroreflective Photoelectric Sensor, 4000 mm, NPN NO	DK-GF18-400NO-ZCA	DK-GF18 retro-reflective photoelectric sensor, 30-4000 mm adjustable, 10-30 V DC, NPN NO, IP55, CE and RoHS.
DK-GF18-50NO-ZAA Diffuse Reflection Photoelectric Sensor, 30-500 mm, NPN NO	DK-GF18-50NO-ZAA	DK-GF18 diffuse reflection photoelectric sensor, 30-500 mm adjustable, 10-30 V DC, NPN NO, IP55, CE and RoHS.

1

Model matrix

All 28 DK-GF18 orderable part numbers

Group A · DC diffuse reflection · 12 models

DK-GF18-50NO-ZAA · DK-GF18-50NC-ZAA · DK-GF18-50PO-ZAA · DK-GF18-50PC-ZAA · DK-GF18-50NS-ZAA · DK-GF18-50PS-ZAA · DK-GF18-150NO-ZAA · DK-GF18-150NC-ZAA · DK-GF18-150PO-ZAA · DK-GF18-150PC-ZAA · DK-GF18-150NS-ZAA · DK-GF18-150PS-ZAA

Group B · DC retro-reflection · 6 models

DK-GF18-400NO-ZCA · DK-GF18-400NC-ZCA · DK-GF18-400PO-ZCA · DK-GF18-400PC-ZCA · DK-GF18-400NS-ZCA · DK-GF18-400PS-ZCA

Group C · DC through-beam · 6 models

DK-GF18-1500NO-ZBA · DK-GF18-1500NC-ZBA · DK-GF18-1500PO-ZBA · DK-GF18-1500PC-ZBA · DK-GF18-1500NS-ZBA · DK-GF18-1500PS-ZBA

Group D · AC/DC relay diffuse · 2 models

DK-GF18-50J-ZAB · DK-GF18-150J-ZAB

Group E · AC/DC relay retro · 1 models

DK-GF18-400J-ZCB

Group F · AC/DC relay through-beam · 1 models

DK-GF18-400J-ZBB

Output codes: NO / NC / NS = NPN NO / NC / NO+NC; PO / PC / PS = PNP NO / NC / NO+NC; J = relay output. Suffix Z = cable connection, A / B / C = sensing mode, final A / B = voltage platform.

Cable and weight by group

Mechanical details for each specification group

Group	Light source	Connection method	Weight
A	850 nm infrared	Ø6.5 mm 2 m PVC cable, 3x0.33 mm² / 4x0.33 mm²	About 93 g
B	940 nm infrared	Ø6.5 mm 2 m PVC cable, 3x0.33 mm² / 4x0.33 mm²	About 97 g + 10 g reflective board
C	850 nm infrared	Ø5 mm 2 m PVC cable; transmitter 2x0.33 mm², receiver 3x0.33 mm² / 4x0.33 mm²	About 84 g x 2
D	850 nm infrared	Ø6.5 mm 2 m PVC cable, 3x0.33 mm²	About 95 g
E	940 nm infrared	Ø6.5 mm 2 m PVC cable, 3x0.33 mm²	About 97 g + 10 g reflective board
F	850 nm infrared	Transmitter Ø5.0 mm 2 m PVC, 2x0.33 mm²; receiver Ø6.5 mm 2 m PVC, 5x0.33 mm²	About 89 g x 2

Through-beam versions are supplied as a transmitter and receiver pair, so the stated weight applies to each unit.

Product views

What is in the box

DK-GF18 sensor with coiled 2 m PVC cable and reflective board — Sensor, 2 m cable and reflective board supplied with retro-reflective versions.

DK-GF18 sensor side view with mounting bracket and reflective board — Stainless mounting bracket and front optical window.

DK-GF18 sensor and reflective board with dimensions marked — Overall dimensions of the sensor and the reflective board.

Applications

Typical industries

The datasheet positions the DK-GF18 series for non-contact object detection in industrial automation, logistics and packaging lines.

Semiconductor Industry
Logistics Packaging
Electronics Manufacturing
Automation Industry
Textile Industry
Printing Industry

FAQ

Frequently asked questions

What is the difference between the DC and AC/DC DK-GF18 versions?

The DC versions run on 10-30 V DC and provide 3-wire or 4-wire NPN / PNP transistor outputs. The AC/DC versions accept 12-240 V DC or 24-240 V AC and provide a built-in 5-wire relay output.

Can the relay version drive a load directly?

Yes. The datasheet rates the relay output at 3 A / 30 V AC and 1 A / 220 V AC, so it can drive contactors, indicator lamps or solenoid valves without a separate PLC output stage.

Which sensing distance should I choose?

DC diffuse reflection covers 30-500 mm and 30-1500 mm, AC/DC diffuse reflection covers 80-500 mm and 100-1500 mm, retro-reflection covers 30-4000 mm, and through-beam reaches 15000 mm.

Is DK-GF18 a safety-rated sensor?

No. DK-GF18 is a general-purpose photoelectric sensor for object detection. CE and RoHS do not constitute functional-safety certification, and this sensor must not be used for personnel protection or as a substitute for a safety light curtain.

What are the housing dimensions and protection rating?

The housing is 50 x 50 x 18 mm in ABS, rated IP55, or IP65 for the DC through-beam version. Working temperature is 0 °C to +55 °C. The series carries CE and RoHS.

Need help selecting a DK-GF18 model?

Tell us the sensing mode, target and distance, supply voltage, output type and quantity. Our engineers will confirm the exact part number and send a quotation.

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DK-GF18 Series Square Photoelectric Sensors

One platform, 28 orderable configurations