GRL18SG-P233Z

Photo Sensor, 7.2 m, PNP, Retroreflective, 10 to 30 VDC, 3 Pin M12 Connector, 270 °, GR18 Series

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Manufacturer: SICK
Product type:
SVHC: No SVHC (21-Jan-2025)
Product Range: GR18 Series
Sensing Method: Retroreflective
Connection Method: 3 Pin M12 Connector
Sensing Range Max: 7.2m
Sensor Output Type: PNP
Supply Voltage DC Max: 30V
Supply Voltage DC Min: 10V

Delivery and price
Units per pack	50
Price	66.79 €
Current stock	10+
Lead time	30 days

Datasheet

GRL18SG-P233Z GR18 

**CYLINDRICAL PHOTOELECTRIC SENSORS** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

## Ordering information 

||**Type**|**Part no.**|
|---|---|---|
||GRL18SG-P233Z|1068113|
||Other models and accessories<br> www.sick.com/GR18||
|Illustration may differ|||



## Detailed technical data 

## Features 

|**Functional principle**||Photoelectric retro-reflective sensor|
|---|---|---|
|**Functional principle detail**||Dual lens|
|**Dimensions (W x H x D)**||18 mm x 18 mm x 38.1 mm|
|**Housing design (light emission)**||Cylindrical|
|**Thread diameter (housing)**||M18 x 1|
|**Optical axis**||Axial, fully flush|
|**Sensing range max.**||0.03 m ... 7.2 m1)|
|**Sensing range**||0.06 m ... 6 m1)|
|**Type of light**||Visible red light|
|**Light source**||PinPoint LED2)|
|**Light spot size (distance)**||Ø 175 mm (7 m)|
|**Wave length**||650 nm|
|**Adjustment**||Potentiometer, 270°|
|**Indication**|||
||LED green|Operating indicator|
|||Static on: power on|
||LED yellow|Status of received light beam|
|||Static on: object not present|
|||Static off: object present|
|**Special feature**||Detecting transparent objects|
|**Special applications**||Detecting transparent objects|



1) Reflector PL80A. 

2) Average service life: 100,000 h at TU = +25 °C. 

**Product data sheet | 2023-07-12 01:30:56 Subject to change without notice** 

**2** 

**PHOTOELECTRIC SENSORS | SICK** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

## Mechanics/electronics 

|**Supply voltage**|10 V DC ... 30 V DC1)|
|---|---|
|**Ripple**|< 5 Vpp 2)|
|**Current consumption**|30 mA|
|**Switching output**|PNP|
|**Switching mode**|Light switching|
|**Signal voltage PNP HIGH/LOW**|VS- (≤ 3 V) / approx. 0 V|
|**Output current Imax.**|≤ 100 mA3)|
|**Response time**|< 500 µs4)|
|**Switching frequency**|1,000 Hz5)|
|**Connection type**|Connector M12, 3-pin|
|**Circuit protection**|A6)<br>B7)<br>D8)|
|**Protection class**|III|
|**Polarisation filter**|✔|
|**Housing material**|Metal, Nickel-plated brass and ABS|
|**Optics material**|Plastic, PMMA|
|**Enclosure rating**|IP67|
|**Items supplied**|Fastening nuts (2 x)|
|**Special feature**|Detecting transparent objects|
|**Electromagnetic compatibility (EMC)**|EN 60947-5-2|
|**Ambient operating temperature**|–25 °C ... +55 °C9)|
|**Ambient temperature, storage**|–40 °C ... +70 °C|
|**UL File No.**|NRKH.E348498 & NRKH7.E348498|



1) Limit values. Operated in short-circuit protected network: max. 8 A. 

2) May not exceed or fall below Uv tolerances. 

3) At Uv > 24 V or ambient temperature > 49 °C, IA max. = 50 mA. 

4) Signal transit time with resistive load. 

5) With light/dark ratio 1:1. 6) A = VS connections reverse-polarity protected. 7) B = inputs and output reverse-polarity protected. 

8) D = outputs overcurrent and short-circuit protected. 

9) Temperature stability following adjustment +/-10 °C. 

## Classifications 

|**eCl@ss 5.0**|27270902|
|---|---|
|**eCl@ss 5.1.4**|27270902|
|**eCl@ss 6.0**|27270902|
|**eCl@ss 6.2**|27270902|
|**eCl@ss 7.0**|27270902|
|**eCl@ss 8.0**|27270902|
|**eCl@ss 8.1**|27270902|
|**eCl@ss 9.0**|27270902|



**2023-07-12 01:30:56 | Product data sheet Subject to change without notice** 

**PHOTOELECTRIC SENSORS | SICK** 

**3** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

|**eCl@ss 10.0**|27270902|
|---|---|
|**eCl@ss 11.0**|27270902|
|**eCl@ss 12.0**<br>**ETIM 5.0**|27270902<br>EC002717|
|**ETIM 6.0**|EC002717|
|**ETIM 7.0**|EC002717|
|**ETIM 8.0**|EC002717|
|**UNSPSC 16.0901**|39121528|



Connection type 

## Connection diagram 

Cd-045 

**==> picture [48 x 43] intentionally omitted <==**

**----- Start of picture text -----**<br>
BN 1<br>+ (L+)<br>BU 3<br>-  (M)<br>BK 4<br>Q<br>**----- End of picture text -----**<br>


**4** 

**Product data sheet | 2023-07-12 01:30:56 Subject to change without notice** 

**PHOTOELECTRIC SENSORS | SICK** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

## Characteristic curve 

## GRL18S 

**==> picture [241 x 232] intentionally omitted <==**

**----- Start of picture text -----**<br>
Operating reserve<br>100<br>10<br>� � � � � �<br>1<br>0 1 2 3 4 5 6 7 8<br>(3.28) (6.56) (9.84) (13.12) (16.40) (19.69) (22.97) (26.25)<br>Distance in m (feet)<br>**----- End of picture text -----**<br>


- ① Reflector PL80A 

- ② Reflector PL40A 

- ③ Reflector PL20A 

- ④ Reflector P250 

- ⑤ Reflector PL22 

- ⑥ Reflective tape REF-Plus 3436 

Light spot size 

## GRL18S 

**==> picture [109 x 119] intentionally omitted <==**

**----- Start of picture text -----**<br>
Diameter in mm (inch)<br>Ø 25<br>Ø 8 Ø 75 Ø 175<br>(0.98)<br>(0.31) (2.95) (6.89)<br>0.2 1 3 7<br>(0.66)(3.28) (9.84) (22.97)<br>Distance in m (feet)<br>Sensor<br>**----- End of picture text -----**<br>


**2023-07-12 01:30:56 | Product data sheet Subject to change without notice** 

**PHOTOELECTRIC SENSORS | SICK** 

**5** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

## Sensing range diagram 

## GRL18S 

**==> picture [197 x 136] intentionally omitted <==**

**----- Start of picture text -----**<br>
0.03/0.06 6.0 7.2<br>OL __<br>0.03/0.06 5.2 6.2<br>is<br>O______. 0.03/0.06 2.9 3.8 | |<br>aan<br>0.03/0.06 5.4 6.4<br>(Cs:|<br>0.03/0.06 1.9/2.2<br>OM”:<br>CL__ 0.06/0.08 1.6/2.0 | tt<br>0 1 2 3 4 5 6 7 8<br>(3.28) (6.56) (9.84) (13.12) (16.40) (19.69) (22.97) (26.25)<br>Distance in m (feet)<br>Sensing range Sensing range max.<br>**----- End of picture text -----**<br>


- ① Reflector PL80A 

- ② Reflector PL40A 

- ③ Reflector PL20A 

- ④ Reflector P250 

- ⑤ Reflector PL22 

- ⑥ Reflective tape REF-Plus 3436 

## Response range 

## GRL18S 

Parallel operating range y in mm (inch) 

**==> picture [242 x 213] intentionally omitted <==**

**----- Start of picture text -----**<br>
100<br>(3.94) Target reflector<br>80 y (reflector size) ||| |<br>(3.15)<br>60 x<br>(2.36)<br>40 sg<br>(1.57)<br>20<br>aa | | ly<br>(0.79)<br>0 —T NC TC<br>-20 — eel \E |tt<br>j} | 7 | ell<br>(-0.79)<br>-40 awSY"_ |<br>(-1.57)<br>-60 me<br>(-2.36)<br>-80 OS SSE ee<br>(-3.15)<br>-100 eee<br>(-3.94)<br>0 1 2 3 4 5 6 7 8<br>(3.28) (6.56) (9.84) (13.12) (16.40) (19.69) (22.97) (26.25)<br>Distance x in m (feet)<br>**----- End of picture text -----**<br>


- ① Reflector PL80A 

- ② Reflector PL40A 

- ③ Reflector PL20A 

- ④ Reflector P250 

- ⑤ Reflector PL22 

- ⑥ Reflective tape REF-Plus 3436 

**6** 

**Product data sheet | 2023-07-12 01:30:56 Subject to change without notice** 

**PHOTOELECTRIC SENSORS | SICK** 

**GRL18SG-P233Z | GR18** CYLINDRICAL PHOTOELECTRIC SENSORS 

## Dimensional drawing (Dimensions in mm (inch)) 

GR18S, metal, connector, straight, fully flush, adjustable 

**==> picture [117 x 197] intentionally omitted <==**

**----- Start of picture text -----**<br>
2<br>— 1 x M18<br>6<br>5 E WA 3<br>4<br>1<br>1 x M12<br>in<br>©<br>①   Connector M12, 3-pin<br>4 1.5  (0.06)<br>(0.16)<br>16 )<br>19.2 (0.76) (0.63)<br>38.1 1.5(<br>1.5<br>1 (0.45)<br>2.2<br>(0.09)<br>2.8<br>(0.11)<br>**----- End of picture text -----**<br>


- ② Threaded mounting hole M18 x 1 

- ③ LED indicator yellow 

- ④ LED indicator green 

- ⑤ Sensitivity control: potentiometer 270° 

- ⑥ Fastening nut; 24 mm hex, metal 

## Recommended accessories 

Other models and accessories www.sick.com/GR18 

||**Brief description**|**Type**|**Part no.**|
|---|---|---|---|
|Mounting brackets and plates||||
|“=|Mounting bracket for M18 sensors, steel, zinc coated, without mounting hardware|BEF-WN-M18|5308446|
||Universal mounting bracket for reflectors, steel, zinc coated|BEF-WN-REFX|2064574|
|Reflectors||||
||Rectangular, screw connection, 51 mm x 61 mm, PMMA/ABS, Screw-on, 2 hole mount-<br>ing|P250|5304812|



**2023-07-12 01:30:56 | Product data sheet Subject to change without notice** 

**PHOTOELECTRIC SENSORS | SICK** 

**7** 

## SICK At A GlAnCe 

SICK is one of the leading manufacturers of intelligent sensors and sensor solutions for industrial applications. A unique range of products and services creates the perfect basis for controlling processes securely and efficiently, protecting individuals from accidents and preventing damage to the environment. 

We have extensive experience in a wide range of industries and understand their processes and requirements. With intelligent sensors, we can deliver exactly what our customers need. In application centers in Europe, Asia and North America, system solutions are tested and optimized in accordance with customer specifications. All this makes us a reliable supplier and development partner. 

Comprehensive services complete our offering: SICK lifetime Services provide support throughout the machine life cycle and ensure safety and productivity. 

For us, that is “Sensor Intelligence.” 

## WOrldWIde preSenCe: 

Contacts and other locations www.sick.com 

SICK AG | Waldkirch | Germany | www.sick.com

Updated at April 23, 2026

SICK is a globally recognized leader in factory and logistics automation technology, renowned for engineering advanced sensors and developing innovative digital services. Driven by a commitment to high precision, reliability, and versatility, the company provides the foundational components required to transform traditional manufacturing processes into intelligent, self-optimizing systems that adapt autonomously using real-time data. Our comprehensive selection of SICK products is heavily focused on their industry-leading sensing technologies. We offer a robust portfolio of light sensors designed to deliver exceptional accuracy and performance in demanding industrial environments. Furthermore, our extensive range features high-quality proximity sensors and switches, providing the dependable object detection essential for automated production, packaging, and material handling applications. To ensure seamless integration of these advanced sensor networks, our offering is complemented by specialized connectivity solutions such as SICK fiber optic lead assemblies. From consumer goods and electronics to logistics and automotive manufacturing, SICK delivers the cutting-edge automation technology necessary to maximize operational efficiency and maintain continuous, reliable performance across diverse industrial sectors.

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