This category of products uses a reinforced waterproof enclosure with a protection rating of IP69K, which is suitable for use in harsh environments. Prevent the entry of water and dust into the product, causing dangerous situations such as short circuit and fire.
The IP69K degree of protection is often used in applications where frequent cleaning is required, such as in breweries, car washes, and food and beverage production and processing.
The SZK series of safety light curtains are extremely cost-effective and are the perfect solution for hazardous point protection and one-sided access protection, helping users to easily achieve safety protection from start to finish.
The SZK waterproof IP67 safety light curtain is a model of the core concept of “protecting the pure safety of machines and operators”, which can precisely protect the safety of machines and operators. Each of Keli's product lines is designed for specific applications and takes into account environmental factors.
There is no doubt that the SZK series of safety light curtains with IP69K protection, the sturdy casing can always protect the safety of the operators, maintain the normal operation of the equipment and maintain high cost performance.
The SZK series of safety light curtains are cleverly combined with metal and synthetic resin components and are extremely rugged so that they can withstand strong impacts and are always safe.
Safe and reliable, with a security rating up to IP 69K
The safety light curtain itself meets IP 65 and IP67 protection levels and is highly available for use in harsh environments.
Ambient operating temperature as low as –30°C
With an ambient operating temperature range of –30°C to +65°C, the safety light curtain maintains consistent safety under all conditions and is cost-effective and trouble-free for use in freezing environments.
 
 
No blind areas: flexible system integration The SZK series of safety light curtains determine the optimum position without regard to the mounting points on the machine frame. Both products feature a dead zone and a unique stand design that provides a high degree of flexibility for machine integration.
The combination of safety and efficiency - the most practical
In all industries, the highly cost-effective SZK series of waterproof IP67 safety light curtains guarantee the safety of personnel and production machines and systems (such as those used in processing machines of various sizes).

■ Machine tool industry
■ Press industry
■ Automotive industry
■ Fixture equipment
■ Handling and storage system
■ Welding equipment
■ Consumer goods and packaging industry
■ Regional protection
■ Test equipment
■ Food manufacturing
■ Electronic equipment industry
■ Thermoforming machine industry
■ Medical equipment industry
■ Robot manufacturing industry

■ Level 2 security protection
■ No blind zone / blind zone Optional
■ Resolution: 10/15/20/30/40/60 mm
■ Protection zone height: 60 mm to 2000 mm
■ Automatic range measurement of protection zone width up to 5m
■ Ambient operating temperature: –30°C to +65°C
■ Enclosure protection rating: IP 65
■ M12 aviation plug

For extremely limited space: continuous protection zone
The SZK series of waterproof and safety light curtains form a high-resolution continuous protection area covering the entire housing up to the end of the housing, minimizing the safety distance required for machine integration. In addition, the protection zone of the SZK series waterproof and safety light curtain can reach a height of 3m. As a result, the product allows distances above and below the safe area to be much smaller than existing safety standards. SZK series waterproof safety light curtain can also shorten the safety distance between operators and dangerous points, and effectively improve production efficiency.
Sturdy casing: SZK series waterproof and safety light curtain adopts high-strength aluminum profile as the outer casing to ensure the safety light curtain is resistant to bending and impact.
Power-on: No security is required without any setup, and work and troubleshooting are fast.

Quick commissioning with LED indicators: The SZK series of waterproof and safety light curtains can be used for all basic functions without pre-configuration and without the need for software to complete the commissioning process. In addition, some models are equipped with integrated LED indicators and diagnostics, which effectively reduces commissioning time.
Plug-and-play maintenance and replacement: SZK series waterproof safety light curtains can be quickly maintained without configuration or wiring. All products feature an exquisite bracket design and standardized M12-4 pin plug technology, simplifying the replacement process for each device. In addition, bright LEDs continuously provide status information for all processes.
The SZK series of waterproof and safety light curtains are designed with a sturdy and clean shape to ensure that the product meets the functional requirements. The SZK series waterproof safety light curtain is specially designed for operation protection applications. It can be started immediately after power-on, without a lot of configuration work, and its detection range can be precisely adjusted according to the application needs. In addition, the safety light curtain has the following features:
? Integrated alignment LEDs for fast and accurate positioning of the transmitter and receiver in optimal relative position;
? Equipped with red/green LED indicators to clearly show the current working status of the safety light curtain.

Note: The installation position refers to the position of the safety light curtain relative to the upper and lower die of the machine. That is, under the premise of ensuring the safety distance, the last light of the safety light curtain shall not be higher than the lower edge of the lower die, and the upper beam shall not be allowed. Below the upper edge of the upper die. This involves the safety light curtain protection height

Calculation of safety distance
In order to ensure the operator's personal safety, the installation position of the safety light curtain must meet the requirements of the safety distance. Otherwise, there is still the possibility of an accident.
■ Safety distance refers to the minimum distance between the light curtain and the cutting edge of the die. The calculation method should be calculated according to the formula of the brake method of the press, or refer to the following table.
■ For presses where the slider can be braked at any position of the stroke, the safety distance:
Ds=1.6(T1+T2)
Where: Ds - safety distance, in meters (m)
           1.6 - Stretching speed of the hand, in meters per second (m/s)
           T1 - response time of safety light curtain, 0.02 seconds (s)
           T2——The braking time of the equipment, that is, the time from the start of braking to the stop of the slider, in seconds (s), measured from the actual braking condition
■ For presses where the slider cannot be braked at any position of the stroke, the safety distance:
Ds=1.6Ts
Where: Ds - safety distance, in meters (m)
           1.6 - Stretching speed of the hand, in meters per second (m/s)
           Ts - the time from when the person leaves the light curtain (that is, the slider is allowed to start) until the device slider reaches the bottom dead center, that is, the down travel time of the slider, in seconds (s), can be calculated according to the following formula or actually measured:
Ts=(1/2+1/N)T
Where: N - the number of engagement slots of the clutch
           Tn - the time the crankshaft makes one revolution, in seconds (s)

Optical synchronization wiring                                    Line synchronous wiring                                         Relay output wiring 

Output form	Light curtain state	Receiver indicator	Output transistor state
NPNType	Pass light	Bright green light	ON	0.3WOutput level≤1V
	Shading	Bright red light	OFF	OPENLeakage current≤2mA
	malfunction	Flashing red light	OFF	OPENLeakage current≤2mA
PNPType	Pass light	Bright green light	ON	0.3W   Output level≤1V
	Shading	Bright red light	OFF	OPEN,DO0V Ground resistance 10K
	malfunction	Flashing red light	OFF	OPEN,DO0V Ground resistance 10K

Product picture
Light curtain type	SZB
Section size	30*30mm
Enclosure rating	IP65
Supply voltage	DC12V-36V±10%
Response time	≤10ms
Signal output	NPN/PNP/Relay
Synchronization type	Optical synchronization / line synchronization
Number of beams	4-500bundle
Optical axis spacing	10mm/15mm/20mm/30mm/40mm/60mm
Protection height	60-2000mm
Protection distance	0.1-10 m
Light curtain form	Opposite type
Anti-interference ability	10000Lux
Shape material	Aluminum alloy
Circuit protection	Reverse protection / output short circuit protection
Power consumption	3-8W
Operating temperature	-15℃--65℃
Ambient temperature	20C,RH≤85%
Dielectric strength	DC30V.5A
Insulation resistance	＞100 MΩ
certified product	CE  ROHS