The QS18VN6AF350 Photoelectric Sensor is a Banner Engineering WORLD-BEAM QS18 Series sensor designed for industrial object detection using adjustable background suppression. Its documented configuration combines a visible red LED sensing beam, a mechanically adjustable cutoff distance from 30 mm to 350 mm, 10–30 V DC supply operation, and an NPN output configuration. This makes the sensor relevant to machine automation, conveyor systems, packaging equipment, material handling, and other applications where a controller needs a repeatable discrete signal when an object enters a defined sensing zone.
Unlike a generic photoelectric sensor, the QS18VN6AF350 is specifically configured for adjustable background suppression. The sensor can be set so that objects beyond the selected cutoff distance are ignored, which is useful when the target and its background are both within the sensor’s general field of view. Banner’s documentation also describes a compact QS18 housing, visible red emitter, multi-turn cutoff adjustment, enhanced fluorescent-light immunity, and a crosstalk-immunity algorithm for sensors installed close to one another.
QS18VN6AF350 Photoelectric Sensor Overview
The QS18VN6AF350 belongs to Banner Engineering’s WORLD-BEAM QS18 family of industrial photoelectric sensors. The exact model is a proximity-type sensor with adjustable background suppression. The current Banner product page identifies it as a QS18 Series All Purpose Photoelectric Sensor and lists the model as a released product.
The important point for machine designers is that QS18VN6AF350 is not simply a standard diffuse sensor. Its adjustable field/background-suppression arrangement allows the user to establish a cutoff distance. Objects beyond that cutoff are not detected in the intended background-suppression configuration. Banner specifically states that this mode can be used where object color, object position, or background conditions vary.
The verified configuration includes:
- Manufacturer: Banner Engineering
- Product family: WORLD-BEAM QS18 Series
- Model: QS18VN6AF350
- General sensing mode: Proximity
- Detailed sensing mode: Adjustable Background Suppression
- Sensing beam: Visible red LED
- Beam wavelength: 640 nm
- Supply voltage: 10–30 V DC
- Output: NPN
- Maximum sensing distance: 350 mm
- Standard connection: 2 m, 4-wire PVC cable
- Housing: Rectangular ABS
- Lens: Acrylic
- Adjustment: Mechanical screw
- Indicators: LEDs
- Operating temperature: -20 °C to 55 °C
- Relative humidity: 95% at 50 °C, non-condensing
- Product-page protection rating: IP67
- Response time: Banner’s current product page lists 2.5 ms; the installation manual states 2.8 ms ON/OFF.
What Does QS18VN6AF350 Mean?
The complete model number should be treated as a manufacturer-defined part number. Banner’s available documentation identifies the exact model and distinguishes it from QS18VP6AF350 and QS18AB6AF350, but it does not provide an official character-by-character explanation of every portion of the model code in the documentation reviewed for this article.
Therefore, it would be inappropriate to claim that individual characters such as “VN,” “6,” “AF,” or “350” independently represent specific technical characteristics unless Banner explicitly defines those characters.
What can be confirmed is that QS18VN6AF350 is the NPN version listed in the QS18AF350 mechanically adjustable background-suppression documentation. Banner lists QS18VP6AF350 as the PNP variant and QS18AB6AF350 as the bipolar variant. The AF350 family is associated with the mechanically adjustable 30–350 mm background-suppression configuration.
Key Features of QS18VN6AF350 Photoelectric Sensor
Adjustable Background Suppression
The defining characteristic of the QS18VN6AF350 is adjustable background suppression. The sensor can be configured with a cutoff distance, allowing objects beyond that cutoff to be ignored.
This is particularly useful when a conveyor, machine frame, mounting surface, or another background object could otherwise influence a conventional reflective sensing arrangement. Instead of simply asking whether reflected light exists, the background-suppression arrangement provides a defined sensing boundary.
For machine builders, this can simplify applications where the background is not perfectly controlled or fixed. Banner specifically describes the BGS mode as suitable for situations involving varying object colors and positions or varying background conditions.
30 mm to 350 mm Adjustable Cutoff
The documented cutoff adjustment range is 30 mm to 350 mm. Banner also specifies a minimum sensing range of approximately 1.5 mm to 3 mm depending on the cutoff setting.
This adjustment range gives an engineer flexibility when positioning the sensor relative to a product or machine surface.
Visible Red LED
The QS18VN6AF350 uses a visible red LED with a wavelength of 640 nm. A visible red emitter can be convenient during installation because the sensing direction is easier to observe than an invisible infrared beam.
Compact QS18 Housing
The sensor uses a rectangular ABS housing with an acrylic lens cover. The compact form factor is intended for machine-level installation where available mounting space can be limited.
Mechanical Cutoff Adjustment
A five-turn adjustment screw is used to set the cutoff distance. The manual describes the adjustment as clutched at both ends of travel. This gives the installer direct mechanical control over the sensing boundary.
Crosstalk Immunity
Banner’s QS18AF350 documentation describes a crosstalk-immunity algorithm that allows two sensors to be used in close proximity. This can be useful on machines where several detection points have to be installed in a relatively small area.
Fluorescent-Light Immunity
The product documentation identifies enhanced immunity to fluorescent lights. This is relevant when photoelectric sensors are installed around industrial lighting that could otherwise contribute to optical interference.
LED Status Indicators
The sensor provides two LED indicators. Banner identifies a green power indicator and a yellow/amber light-sensed indicator. The latter can flash under marginal sensing conditions, giving maintenance personnel a useful visual indication during setup and troubleshooting.
QS18VN6AF350 Technical Specifications
| Specification | Verified Details |
| Model | QS18VN6AF350 |
| Manufacturer | Banner Engineering |
| Product family | WORLD-BEAM QS18 |
| Sensor type | Photoelectric sensor |
| General sensing mode | Proximity |
| Detailed sensing mode | Adjustable Background Suppression |
| Sensing beam | Visible red LED |
| Wavelength | 640 nm |
| Supply voltage | 10–30 V DC |
| Maximum sensing distance | 350 mm |
| Adjustable cutoff | 30–350 mm |
| Minimum sensing range | 1.5–3 mm, depending on cutoff |
| Output | NPN |
| Input/output | Discrete |
| Operation | Light/Dark Operate |
| Housing | Rectangular |
| Housing material | ABS |
| Lens material | Acrylic |
| Connection | Cable |
| Standard cable | 2 m, 4-wire PVC cable |
| Adjustment | Mechanical screw |
| Indicators | LEDs |
| Temperature | -20 °C to 55 °C |
| Relative humidity | 95% at 50 °C, non-condensing |
| Product-page protection rating | IP67 |
| Output response | 2.5 ms on current product page; 2.8 ms ON/OFF in installation manual |
| Repeatability | 250 µs |
| Power-up delay | 200 ms |
| Output current | 100 mA total output rating |
| IO-Link | No |
| Quick disconnect on standard model | No |
The current Banner product page lists IP67, while the installation manual’s environmental section states IEC IP67, NEMA 6, and UL Type 1. Because these designations appear differently across the current product listing and manual, buyers should use the documentation supplied for the exact ordered configuration when determining compliance with a machine’s environmental requirements.
The same source difference exists for output response time: the current product page lists 2.5 ms, while the QS18AF350 installation manual specifies 2.8 ms ON/OFF. For a machine with a very tight timing budget, the applicable current manufacturer documentation should be confirmed before final engineering approval.
Working Principle of QS18VN6AF350 Photoelectric Sensor
The QS18VN6AF350 operates as an adjustable background-suppression photoelectric sensor. Its working process can be understood as a sequence:
Visible red light emission → interaction with target → optical detection → signal processing → NPN output → PLC/controller input → machine action
The sensor emits visible red light toward the target area. When an object enters the configured sensing region, the optical response received by the sensor changes. The internal electronics evaluate that response in relation to the configured cutoff distance.
The background-suppression function is the critical part. Objects beyond the selected cutoff distance are not detected in the intended BGS mode. This lets the sensor distinguish a target from a more distant background under appropriate separation and installation conditions.
Banner’s installation procedure recommends setting the cutoff approximately midway between the farthest target and the closest background. The manual gives a practical example in which a darker object is located at 150 mm and a brighter background at 200 mm, with the required separation evaluated using Banner’s minimum-separation guidance.
Once the sensor detects the target according to the configured sensing condition, its solid-state NPN output changes state. That output can then be connected to an appropriate PLC input or machine-control circuit.
QS18VN6AF350 Detection Performance
Detection performance depends not only on the nominal 350 mm maximum range but also on the actual application geometry.
Important considerations include target distance, target reflectivity, object color, object position, background characteristics, object orientation, sensor alignment, and the required separation between the object and background.
Banner’s manual emphasizes that background suppression requires a minimum separation between the target and background for reliable operation. Therefore, an application should not be evaluated simply by asking whether the object is somewhere inside the 350 mm maximum range. The engineer must also examine how close the background is to the target.
For reflective or mirror-like objects, Banner recommends minimizing the sensor-to-object mounting distance and tilting the sensor so reflected light is directed away from the sensor when the object is present.
QS18VN6AF350 in Industrial Automation
The QS18VN6AF350 can be useful anywhere a machine needs a discrete signal indicating that an object is present within a configured sensing zone.
Conveyor Automation
On a conveyor, the sensor can detect products as they pass a defined point. The resulting NPN signal can be processed by a PLC to initiate counting, indexing, downstream transfer, stopping, or other machine logic.
Background suppression is particularly useful when the conveyor or another surface is located behind the product and could otherwise affect detection.
Packaging Automation
Packaging machines often require repeatable product-presence detection. The QS18VN6AF350 can be considered for detecting cartons, packages, containers, or machine components when the target geometry and sensing distance are compatible with the BGS configuration.
A PLC can use the sensor signal to trigger a packaging sequence, verify product arrival, or synchronize another machine operation.
Manufacturing Lines
On automated production lines, the sensor can detect the presence or absence of components at defined positions. This can provide an input for sequencing operations and process verification.
Material Handling
Material-handling equipment can use photoelectric detection to identify objects moving through transfer points. The QS18VN6AF350’s adjustable cutoff can help separate a target from a known background when the installation geometry supports it.
Assembly Machines
The sensor can be used for part-presence detection where a component must be confirmed before the next machine sequence begins. Correct target placement and separation remain important.
Product Counting
Each valid detection can become a PLC counting event. Engineers should consider machine speed, target spacing, response characteristics, and PLC scan/input behavior when designing a counting system.
Benefits of QS18VN6AF350 Photoelectric Sensor
The main engineering benefits come from its documented sensing configuration rather than broad marketing claims.
Adjustable background suppression can help distinguish a target from a background when the installation meets the required separation conditions.
30–350 mm cutoff adjustment gives the machine designer flexibility to establish a sensing boundary for different layouts.
Visible red LED sensing makes setup and alignment practical because the emitted beam is visible.
NPN discrete output allows integration with control systems designed for sinking sensor inputs.
Compact ABS housing supports installation where machine space is limited.
LED indicators provide immediate visual information about power and light-sensing status.
Crosstalk immunity can help when two sensors have to operate near each other.
These characteristics do not make the sensor universally suitable for every object-detection application. The correct choice depends on the target, machine geometry, electrical interface, speed, and environmental conditions.
QS18VN6AF350 Integration with PLC and Control Systems
A typical signal path can be represented as:
Target Object → QS18VN6AF350 → NPN Sensor Output → PLC Input → Machine Logic → Machine Action
The QS18VN6AF350 is documented with complementary NPN outputs. The installation manual identifies the black and white conductors as the two output functions for the complementary configuration and identifies the brown and blue conductors for the supply connections.
For the standard cabled configuration, Banner’s manual identifies:
- Brown: supply positive
- Blue: supply negative
- Black: light-operate output
- White: dark-operate output
The exact PLC input circuit must be designed according to the PLC manufacturer’s electrical requirements and Banner’s sensor documentation. Electrical work should be performed by qualified personnel in accordance with applicable electrical codes.
The sensor documentation specifies a 100 mA total output-current rating, an off-state leakage current below 50 µA at 30 V DC, and protection against false pulses during power-up and continuous output overload or short circuit.
The 200 ms power-up delay is also important in machine sequencing. Banner states that the outputs do not conduct during this startup period.
Installation Guide for QS18VN6AF350
Mechanical Installation
Mount the sensor securely and orient it according to the target geometry. Correct orientation is essential for reliable background-suppression performance.
Avoid unnecessary vibration and make sure the sensor does not move after the cutoff distance has been adjusted.
The target should pass through the intended sensing region consistently. If the target position varies significantly, evaluate whether the variation remains compatible with the selected cutoff and required object-background separation.
Setting the Cutoff
Banner provides a specific setup procedure for the QS18AF350 BGS configuration.
First, place the darkest target at the longest application distance. Adjust the screw until the yellow indicator changes state. Then replace the target with the brightest background at the closest application distance and adjust the sensor while observing the indicator. The cutoff is then positioned approximately midway between the relevant switching points.
This procedure is more reliable than simply turning the adjustment screw until the sensor appears to work with one test object.
Electrical Installation
Confirm the supply voltage and output arrangement before connecting the sensor. The QS18VN6AF350 operates from 10–30 V DC and uses NPN outputs.
Use the manufacturer’s wiring documentation for the exact installation. Do not substitute a PNP wiring arrangement simply because another QS18 model uses PNP outputs.
Factors Affecting QS18VN6AF350 Detection
Several conditions can influence detection reliability:
- Target distance
- Target color
- Target reflectivity
- Target size
- Object orientation
- Background reflectivity
- Object-background separation
- Sensor alignment
- Machine vibration
- Ambient lighting
- Contamination on the lens
- Target movement
- Electrical installation
- Machine speed
Reflective or mirror-like surfaces deserve particular attention. Banner recommends minimizing the sensor-to-object distance and angling the sensor so reflected light is directed away from the sensor when the object is present.
Maintenance of QS18VN6AF350
Routine maintenance should focus on keeping the optical path and mechanical installation stable.
Inspect the sensing surface for dust, oil, residue, or other contamination. Check that the sensor has not shifted from its original position. Inspect the cable and connection for physical damage.
It is also useful to periodically test the sensor with the actual production target rather than relying only on an indicator LED. A sensor may remain electrically powered while the machine’s actual detection margin changes because of alignment, contamination, target position, or background conditions.
For machines with critical production sequences, maintenance teams should record the expected sensing position and verify it during scheduled inspections.
QS18VN6AF350 Troubleshooting
| Problem | Possible Cause | Recommended Check |
| Object not detected | Incorrect alignment or cutoff setup | Check sensor orientation, target distance, and cutoff adjustment |
| Intermittent detection | Target movement or marginal sensing | Check target position, separation, alignment, and yellow indicator |
| Background detected | Cutoff incorrectly configured | Reset the cutoff using the manufacturer’s BGS procedure |
| False detection | Reflective target or environmental condition | Check target reflectivity, sensor angle, and surrounding conditions |
| No output | Power or wiring issue | Confirm supply voltage and sensor wiring |
| PLC does not receive signal | Incorrect input interface or output connection | Verify NPN compatibility and the PLC input circuit |
| Detection changes after maintenance | Sensor moved during service | Recheck alignment and cutoff |
| Detection becomes unstable | Contaminated lens | Clean the sensing surface using an appropriate method |
The sensor’s yellow indicator can also provide useful setup information. Banner states that the light-sensed indicator flashes under marginal sensing conditions.
QS18VN6AF350 for Machine Builders and OEMs
OEMs should evaluate the sensor as part of the complete machine rather than as an isolated component.
Before specifying QS18VN6AF350, verify:
- Target characteristics
- Required sensing distance
- Target-background separation
- Background conditions
- Machine speed
- Required PLC input type
- NPN output compatibility
- Available mounting space
- Cable routing
- Environmental conditions
- Maintenance accessibility
- Required connector or cable configuration
The sensor is available in the standard 2 m cable configuration, while Banner’s QS18AF350 documentation also identifies ordering options involving a 9 m cable and 150 mm pigtails with 4-pin M8 or M12 connectors through the corresponding model suffixes. These should not be confused with the standard QS18VN6AF350 configuration.
QS18VN6AF350 vs Generic Photoelectric Sensors
The correct engineering comparison is not simply “which sensor is better?”
A sensor should be selected according to the application.
For QS18VN6AF350, important selection criteria include adjustable background suppression, the 30–350 mm cutoff range, visible red sensing, NPN output, 10–30 V DC supply, required object-background separation, machine speed, mounting arrangement, and environmental requirements.
A different photoelectric sensor may be more appropriate if the application requires another sensing mode, longer range, PNP output, transparent-object detection, IO-Link communication, or another specialized capability.
Why Choose QS18VN6AF350 Photoelectric Sensor?
Automation engineers may consider the QS18VN6AF350 Photoelectric Sensor when its documented characteristics match the machine’s detection requirements.
The strongest reasons to evaluate this model are its adjustable background suppression, 350 mm maximum sensing distance, visible red LED, mechanical cutoff adjustment, NPN discrete output, compact QS18 housing, LED status indication, and documented environmental operating range.
The model is especially relevant where the application requires a controlled detection boundary rather than simply detecting reflected light from any object within a broad field.
Where to Buy QS18VN6AF350 Photoelectric Sensor in India
Indian automation companies looking to Buy QS18VN6AF350 Photoelectric Sensor can explore industrial sensor suppliers that list the exact model and can confirm current availability.
Genesis Technomation India Private Limited currently lists QS18VN6AF350 among its photoelectric sensor models and provides a dedicated Photoelectric Sensor product page.
When contacting a QS18VN6AF350 supplier in India, provide the complete part number rather than requesting only a “QS18 sensor.” This is important because the QS18 family contains multiple sensing modes and output configurations.
Before purchasing, confirm:
- Exact model number: QS18VN6AF350
- Current availability
- Current manufacturer specifications
- Cable or connector configuration
- Required quantity
- Application suitability
- Delivery requirements
- Current quotation
- Applicable taxes and shipping
Genesis also has a dedicated Photoelectric Sensor page that lists QS18VN6AF350 alongside other industrial sensor models.
QS18VN6AF350 Photoelectric Sensor Price
The QS18VN6AF350 price should be confirmed through a current quotation rather than copied from an old online listing.
Price can vary according to:
- Exact model configuration
- Quantity ordered
- Supplier
- Stock availability
- Cable or connector configuration
- Shipping
- Taxes
- Market conditions
Online distributor pricing can also change without notice. Therefore, the best approach for an industrial purchase is to request a current quote for the exact QS18VN6AF350 configuration.
For a Photoelectric Sensor price in India, buyers should also compare the exact technical configuration rather than comparing only the product family name.
How to Select the Right Photoelectric Sensor
Use the QS18VN6AF350 as the reference point, but validate every requirement before approving a sensor.
1. Identify the Target
Determine the object’s material, color, size, surface finish, and movement.
2. Determine the Required Sensing Distance
Measure the real sensor-to-target distance rather than relying only on a nominal machine drawing.
3. Confirm Sensing Technology
For QS18VN6AF350, the relevant configuration is adjustable background suppression.
4. Evaluate the Background
Determine whether the background is close to the target and whether the required separation can be maintained.
5. Check Machine Speed
Compare the application’s timing requirements with the sensor’s documented response characteristics.
6. Confirm Supply Voltage
QS18VN6AF350 requires a 10–30 V DC supply.
7. Confirm Output Configuration
This model uses NPN output. The PLC input must be compatible with the intended sinking-output arrangement.
8. Evaluate Environmental Conditions
Consider temperature, humidity, dust, oil, contamination, and mechanical vibration.
9. Check Mounting
Make sure the sensor can be mounted securely and oriented correctly.
10. Confirm Cable Requirements
The standard model uses a 2 m cable. Other QS18AF350 configurations use different suffixes for alternate cable or connector arrangements.
11. Plan Maintenance Access
The sensor should remain accessible for inspection, cleaning, adjustment, and replacement.
12. Validate the Complete Machine
Finally, test the actual target under real operating conditions. Laboratory detection does not automatically guarantee reliable production detection.
FAQs About QS18VN6AF350 Photoelectric Sensor
1. What is the QS18VN6AF350 Photoelectric Sensor?
The QS18VN6AF350 is a Banner Engineering WORLD-BEAM QS18 Series photoelectric sensor with adjustable background suppression. It uses a visible red LED sensing beam and provides an NPN discrete output.
2. What sensing technology does QS18VN6AF350 use?
It uses proximity sensing with adjustable background suppression. The cutoff distance can be mechanically adjusted from 30 mm to 350 mm.
3. How does QS18VN6AF350 work?
The sensor emits visible red light toward the target area and evaluates the returned optical signal in relation to its configured cutoff. Objects beyond the selected cutoff are suppressed in the BGS configuration. The resulting detection state is provided through the sensor’s NPN output.
4. What objects can QS18VN6AF350 detect?
It can be used for industrial object detection where the target’s size, reflectivity, position, and background separation are compatible with the BGS configuration. The exact application should be tested rather than assuming every material will produce identical detection performance.
5. What is the sensing range of QS18VN6AF350?
The adjustable cutoff range is 30 mm to 350 mm, with a documented minimum sensing range of approximately 1.5–3 mm depending on cutoff.
6. What is the output configuration of QS18VN6AF350?
The exact model uses an NPN output configuration. Banner’s documentation identifies it as the NPN version of the QS18AF350 family.
7. How is QS18VN6AF350 connected to a PLC?
The sensor provides a discrete NPN output that can be connected to a compatible PLC input. The exact control-panel wiring must follow the sensor and PLC manufacturers’ electrical requirements.
8. Where is QS18VN6AF350 commonly used?
Suitable applications can include conveyor detection, packaging machinery, production lines, material handling, assembly equipment, product counting, and general machine object detection when the sensing geometry matches the sensor’s documented capabilities.
9. Can QS18VN6AF350 be used in packaging automation?
Yes, it can be considered for packaging applications involving object or product detection where the target, distance, background, speed, and electrical interface are compatible with the sensor.
10. How should QS18VN6AF350 be installed?
Install it securely, orient it correctly toward the target, establish the required target-background separation, and adjust the cutoff using the manufacturer’s BGS procedure. Electrical connections should follow Banner’s wiring documentation.
11. What factors affect QS18VN6AF350 detection?
Target reflectivity, object color, target distance, object position, background characteristics, sensor orientation, contamination, ambient conditions, vibration, and object-background separation can all influence application performance.
12. How should QS18VN6AF350 be maintained?
Keep the sensing surface clean, check mounting stability and alignment, inspect the cable, verify detection with the production target, and periodically confirm that the cutoff remains appropriate.
13. What is the QS18VN6AF350 Photoelectric Sensor price?
There is no fixed price that should be treated as universally current. The actual QS18VN6AF350 Photoelectric Sensor price depends on supplier, configuration, quantity, availability, shipping, and taxes. Request a current quotation for the exact model.
14. Where can I buy QS18VN6AF350 in India?
Genesis Technomation India Private Limited lists QS18VN6AF350 among its photoelectric sensor offerings. Buyers should confirm current stock, exact configuration, pricing, and application suitability before ordering.
15. What should I check before purchasing QS18VN6AF350?
Confirm the complete model number, sensing mode, required cutoff distance, target characteristics, target-background separation, NPN output compatibility, supply voltage, mounting arrangement, environmental conditions, cable requirements, availability, and current price.
Conclusion
The QS18VN6AF350 Photoelectric Sensor is a Banner Engineering WORLD-BEAM QS18 Series sensor designed around adjustable background suppression. Its documented configuration includes a visible red 640 nm LED, 10–30 V DC supply, NPN output, adjustable 30–350 mm cutoff, mechanical screw adjustment, LED indicators, and a compact ABS housing.
Its primary engineering value is the ability to establish a sensing cutoff and suppress objects beyond that distance. This makes it relevant to conveyor automation, packaging machines, manufacturing lines, assembly systems, material handling, product detection, and other machine-control applications where reliable object presence information is required.
Correct installation is critical. Engineers should evaluate target characteristics, background separation, sensor orientation, electrical compatibility, machine speed, environmental conditions, and maintenance access before selecting the model.
For organizations looking for Photoelectric Sensor India solutions or wanting to Buy Photoelectric Sensor equipment, Genesis Technomation India Private Limited can be explored for industrial sensor and automation solutions. Always confirm the exact QS18VN6AF350 model, current specifications, availability, pricing, and application suitability before purchase.
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