The Datasensing SG4-H Hygienic Safety Light Curtain provides Type 4, 14 mm finger protection for pharmaceutical filling, tablet-blistering and aseptic processing machinery. Its IP69K-rated AISI 316L stainless steel housing and optical glass window support washdown installations without additional protective tubes, with an emitter-to-receiver operating distance of 0.2–6 m.
The SG4-H guards machine openings where operators work close to hazardous movement and the equipment requires frequent cleaning. An emitter and receiver create a protected field; interrupting that field switches the safety outputs off, allowing the connected machine-safety circuit to stop or inhibit hazardous motion.
For projects combining process detection and personnel protection, MarvelTech’s sensors and machine safety range covers these different requirements. The SG4-H specifically provides finger detection for the safeguarding function.
The AISI 316L housing has a surface roughness below 0.8 µm, an optical glass window and rounded surfaces without gaps or sharp edges. Product information is laser-marked onto the housing, avoiding applied labels that can complicate cleaning.
This construction suits pharmaceutical primary packaging, syringe-filling equipment, tablet-blistering machinery and Restricted Access Barrier Systems (RABS), where access-point guarding must fit the machine’s hygienic design. The enclosure removes the need for a separate protective tube.
IP69K addresses resistance to high-pressure, high-temperature water jets under specified test conditions. Cleaning-agent compatibility, concentration, contact time and temperature still require assessment for the intended process; the rating alone does not establish suitability for steam sterilisation or autoclaving.
| Parameter | Specification |
|---|---|
| Safety classification | Type 4 according to EN 61496-1; PL e according to EN ISO 13849-1; SIL 3 according to IEC 61508 |
| Detection resolution | 14 mm for finger protection |
| Protected heights | 150, 300 or 450 mm |
| Operating distance | 0.2–6 m between emitter and receiver |
| Response time | 11, 15 or 18 ms, depending on model |
| Power supply | 24 V DC |
| Safety outputs | Two monitored PNP outputs; maximum 0.5 A per output |
| Connections | M12 4-pin emitter; M12 5-pin receiver |
| Restart and monitoring | Automatic restart; no built-in external device monitoring (EDM) |
| Enclosure protection | IP65 / IP69K |
| Housing and window | AISI 316L stainless steel; optical glass |
| Profile | 50 × 30 mm; overall length depends on protected height and mounting version |
| Operating environment | 0 to +55 °C; 15–95% relative humidity, non-condensing |
The safety classifications apply to the device. The achieved performance of the complete safeguarding function also depends on the control system, stopping elements, installation and validation.
The receiver provides two output signal switching devices (OSSDs): monitored electronic outputs for connection to compatible safety-relay or safety-PLC inputs. The integration must account for both output channels and the input requirements of the selected safety controller.
SG4-H uses automatic restart: its outputs can return to the enabled state when the protected field clears. It has no built-in external device monitoring (EDM), the function used to check feedback from downstream switching devices such as contactors. Where the application requires a monitored manual reset or contactor feedback, these functions must be provided by the external safety-control system.
The 0.2–6 m operating distance describes the separation between emitter and receiver. The required distance from the light curtain to the hazard is a separate calculation based on the selected model’s response time, the control-system response, machine stopping time and the approach path.
Select the protected height from the access geometry, including possible reach over, under or around the sensing field. The nominal 150, 300 or 450 mm height describes the protected area rather than the overall housing length.
Four LEDs and a seven-segment display assist alignment and diagnostics. Allow sufficient installation space for the complete housing, holders, connectors and cable routing, beyond the 50 × 30 mm profile.
Illustrative configuration: for a syringe-filling machine requiring a 300 mm protected height and top-and-bottom fixing, SG4-H14-030-OO-X-G is a model to assess. Selection also requires checking the access paths, stopping distance, cleaning procedure and external restart controls.
The SG4-H technical brochure includes model codes, mounting drawings and accessory references. It is revision 07, dated May 2020; use the instruction manual supplied with the selected device for installation requirements.
Choose SG4-H when the application requires both Type 4 finger protection and a hygienic stainless steel enclosure, within its available protection heights and operating range. Its distinguishing feature is the washdown-ready housing with an optical glass window.
For a dry machine opening without stainless steel or washdown requirements, a conventional Type 4 light curtain with the same 14 mm resolution is a relevant alternative. Compare protected height, operating distance, response time and restart functions on equivalent models; the Type 4 classification alone does not establish equivalent environmental protection.
An opening requiring more than 450 mm of protected height, a sensing distance beyond 6 m or a different detection arrangement needs another model or safeguarding design. Applications where someone can pass through the field and remain inside the hazardous area also require measures addressing undetected presence and restart.
A replacement requires more than matching the protection height. Check resolution, response time, mounting dimensions, connector pin assignments, OSSD compatibility and restart behaviour against the existing design. The changed safeguarding function must then be validated.
The housing supports cleanability, but suitability depends on the complete installation and the site’s cleaning and contamination-control requirements. Assess the sensor, holders, cable connections and cleaning procedure together.
MarvelTech supplies industrial automation and safety-sensor equipment. Request a quote identifying the SG4-H height and mounting version, cable requirements, mounting hardware and any safety-control equipment or project support required.
Include the machine type, opening dimensions, emitter-to-receiver distance, stopping-time information, required safety performance, existing safety relay or PLC, and cleaning-agent details. Drawings or photographs help clarify mounting space and access paths.
Ask MarvelTech to confirm the proposed configuration, included accessories, availability, delivery estimate, warranty terms and installation or support scope in the quotation.
Choose SG4-H when an access opening needs finger protection together with a stainless steel enclosure designed for frequent washdown. Typical applications include pharmaceutical filling, tablet blistering and syringe-processing machinery. For dry machinery without hygienic construction requirements, compare other machine safety devices against the required detection capability, opening dimensions and control functions.
The 14 mm resolution describes the curtain’s rated detection capability for finger protection; it is not a dimensional measurement accuracy. Type 4 describes its protective-device classification. Datasensing also specifies PL e and SIL 3 for SG4-H, but the complete machine safety function must achieve its required performance through suitable controls, stopping elements, installation and validation.
Choose the protected height from the opening and the possible paths to the hazard, including reaching over, under or around the beams. The 150, 300 and 450 mm values describe the protected field, not the overall housing length. If the required coverage exceeds 450 mm, select another device or revise the guarding arrangement.
The B version has mechanical fixing at the bottom; the G version provides fixing at both top and bottom. For example, SG4-H14-030-OO-X-B and SG4-H14-030-OO-X-G both provide a 300 mm protected height. Select according to the available mounting points and dimensional drawings. Brackets are not included, so specify suitable cylindrical holders and allow space for connectors and cables.
No. The 0.2–6 m range is the separation between emitter and receiver. The required distance from the sensing plane to the hazard depends on the complete stopping time and access geometry. SG4-H response times are 11 ms at 150 mm, 15 ms at 300 mm and 18 ms at 450 mm protected height. These exclude controller delays and machine stopping time.
No. IP69K addresses water ingress under specified high-pressure, high-temperature jet test conditions; it does not establish compatibility with every chemical or sterilisation cycle. SG4-H combines AISI 316L stainless steel and optical glass without requiring an additional protective tube. Check cleaning-agent concentration, exposure time and temperature, together with the holders and cable connections. Autoclaving suitability requires separate confirmation.
SG4-H provides automatic restart and has no built-in external device monitoring (EDM), which checks feedback from downstream switching devices such as contactors. Its safety outputs can return to the enabled state when the field clears. Where the risk assessment requires monitored manual reset or contactor feedback, the external safety-control system must provide those functions.
SG4-H requires a 24 V DC supply and provides two PNP OSSD safety outputs, meaning monitored electronic switching outputs. Connect both channels to compatible safety-relay or safety-PLC inputs. The emitter uses an M12 4-pin connection and the receiver an M12 5-pin connection. A standard PLC input alone does not establish the required safety function; verify input compatibility and connector pin assignments.
SG4-H provides safety-rated finger protection, while the Datasensing DS4 Standard detection and measurement sensor checks objects and dimensions for process control. Their similar emitter–receiver arrangement does not make them interchangeable. Choose SG4-H for personnel safeguarding within its application limits; assess DS4 Standard for tasks such as carton-height checks, with personnel protection handled separately.
Yes. Nearby reflective surfaces can redirect light towards the receiver and compromise detection, while condensation, airborne powder or dirty windows can reduce optical performance. Keep the manufacturer’s required clearance from reflective machine surfaces and assess interference from adjacent light curtains. Check the complete protected field after installation; successful alignment alone does not demonstrate correct safeguarding.
Possibly, but matching Type 4 classification and protected height is insufficient. Compare resolution, response time, overall dimensions, mounting, connector pin assignments and safety-input compatibility. Check restart behaviour especially carefully: replacing a curtain with built-in manual reset or EDM requires those functions to be addressed elsewhere. Validate the modified safety function before returning the machine to service.
Include the machine application, opening dimensions, required protected height, mounting preference and emitter-to-receiver distance in your SG4-H quotation enquiry. Add stopping-time data, required safety performance, existing safety-controller details and cleaning conditions. Drawings help identify mounting and access constraints. Ask for an itemised configuration covering the emitter–receiver pair, holders, cables and any control equipment, with availability and support scope confirmed.
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