Leuze Parts NZ | MLC500 MLC510 Light Curtains PRK HT Sensors

Leuze Parts, New Zealand

RFQ / Leuze

The transmitter is always an MLC 500. The receiver number is the feature class. The two halves of one light curtain never share a number, and it catches people ordering from a parts list.

Leuze is on packaging, materials handling and press lines across New Zealand. Safety light curtains, laser scanners, safety switches and photoelectric sensors.

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Reference pages

Page	Covers
MLC light curtains and MLD light beam devices	Receiver class decode, blanking, transceivers and muting rules
RSL safety laser scanners	Connection unit decode, function variants, the RS4 migration path
Photoelectric sensors	Dual output pins, variant suffixes, the 25B to 25C migration table

Nothing on Leuze is one part

The pattern that runs through the whole range, and the first thing to establish on any order.

Product	Separate parts
MLC light curtain	MLC500 transmitter and MLC5x0 receiver
MLD transmitter-receiver	Two powered units
MLD transceiver	One unit and a passive deflecting mirror
RSL scanner	Sensor head and CU connection unit
PRK photoelectric	Sensor and reflector
LS and LE photoelectric	Two units, transmitter and receiver
Non-contact safety switch	Switch and actuator

Tell us which half you need. On a curtain the transmitter is the simpler and cheaper part, and on an MLD the far side may be a mirror rather than a device.

The MLC decode

Take MLC500T14-1200.

Part	Meaning
MLC	Safety light curtain
500	Series
T	Transmitter
14	Resolution, 14 mm
1200	Protective field height, 1200 mm

The receiver number is the class

Number	Class
MLC 500 T	Transmitter. Always 500
MLC 510 R	Basic
MLC 520 R	Standard
MLC 530 R	Extended. Adds blanking
MLC 530 R-SPG	Smart Process Gating

So a transmitter is a transmitter, replaced on resolution and height alone. A receiver is not just a receiver: fitting a 510 where a 530 was removes blanking and the machine will not behave as it did.

Resolution decides the application

Resolution	Protects
14 mm	Finger
30 mm	Hand
Larger	Arm and body

Resolution is not a quality setting. It was chosen from the hazard and it sets the mounting distance under ISO 13855.

And a shorter curtain does not cover the opening the original did. Height and resolution both have to match.

Ratings across the range

Not all Leuze safety devices reach the same level, and the technology sets the ceiling.

Device	Rating
MLC 500 light curtain	Type 4
MLC 300 light curtain	Type 2
MLD 500	Type 4, PL e
MLD 300	Type 2, PL c
RSL 400 laser scanner	Type 3

The MLD 300 to MLD 500 gap is a large one and it is the whole basis of that choice. A 300 is not a cheaper 500; it is a lower performance level.

And a scanner is Type 3 where a curtain is Type 4. A scanner suits area and approach protection, not a hazardous point.

The suffix letters

Suffix	Meaning
None	Basic model
H	Host, for a cascaded arrangement
G	Guest, the cascaded partner
/A	AS-Interface

A Guest cannot work on its own. If a machine has more than one curtain and only one set of output wiring, it is cascaded, so check the suffixes.

An /A unit connects over AS-Interface rather than through discrete OSSD outputs. That is an architectural difference, not a connection option.

The order number is definitive

Leuze uses an 8-digit order number alongside the type code.

Type	Order number
MLC500T14-1200	68000112
MLC500T14-1200H	68010112
MLC500T14-1200H/A	68016112
MLC510R14-1200H/A	68017112
MLC500T14-1200G	68020112

Notice how close those are. The basic, Host, Host AS-i and Guest versions of the same transmitter differ in the middle digits only.

Send both identifiers where you have them. The order number resolves a worn or partly readable label.

Migration paths

Leuze publishes replacements for several discontinued ranges, which is worth asking about before quoting a rebuild.

From	To	Via
RS4 scanner	RSL 400	CU411-RS4 connection unit
PRK 25B photoelectric	PRK 25C	Published cross-reference
SOLID, COMPACTplus, RD800	Current families	Not drop-in

The CU411-RS4 is the useful one. An RS4 is long discontinued, and the connection unit lets a current scanner take its place rather than requiring a rewire.

Send us the old number either way. We quote both a used original and the current equivalent, and the choice usually comes down to whether the assessment is worth preserving.

Photoelectric sensors

Prefix	Principle	Needs
PRK	Polarised retro-reflective	A reflector
HT	Diffuse	Nothing
HRT	Diffuse with background suppression	Nothing
LS and LE	Through-beam	Two units
ET	Diffuse family	Nothing

Both switching modes are already on the sensor

A real difference from other brands.

A PRK25C carries two live outputs: pin 4 light switching and pin 2 dark switching.

So if a machine needs the opposite behaviour, move the wire. No new sensor.

And if a replacement appears to work backwards, check which pin the harness lands on before ordering anything.

Before ordering a replacement

Symptom	Check first
Curtain stuck in interlock	The reset button. Held or shorted for 30 s causes it
Curtain will not go clear	The 7-segment display. It reports why
Two adjacent curtains tripping each other	Channel switching and reducible range. A setting, not a fault
Scanner nuisance tripping	Clean the optical screen
Muted line nuisance tripping	The muting sensors, not the light beam device
Retro-reflective sensor misdetecting	Clean the reflector. Look for the red spot on it
Sensor misses black product, sees white	Principle. You want an HRT, not another HT
Sensor worked at commissioning, unreliable now	Whether it was installed beyond the operating range
Curtain faulting intermittently	Supply voltage at the device. The MLC range is specified tightly

What a light curtain installation needs

Worth setting out, because a curtain is never one part.

Item
Transmitter
Receiver, matched resolution and height
Safety relay, unless the outputs go to a safety controller
Two connection cables. 5-pin transmitter, 8-pin receiver
Two mounting bracket sets

On a replacement most of that already exists. On a new installation none of it does. Tell us which situation you are in.

What Leuze makes

Range	Product
MLC 300, MLC 500	Safety light curtains
MLD 300, MLD 500	Multiple light beam safety devices
RSL 400	Safety laser scanners
MSI, MSI-T	Safety controllers and monitoring devices
L100, S200, S300	Safety switches and interlocks
SOLID, COMPACTplus, RS4, RD800	Discontinued safety families
PRK, HT, HRT, LS, LE, ET	Photoelectric sensors
IS	Inductive proximity
CS	Capacitive
ODS, AMS	Distance and position measurement
DDLS	Optical data transmission
BCL, DCR, LSIS	Bar code, code readers and vision
CML, LCS	Measuring light curtains, non-safety

Measuring light curtains are not safety devices

Worth stating plainly because they look similar on a machine.

A CML measuring light curtain detects and measures objects. It is not a safety device and carries no Type rating.

So a CML and an MLC are not alternatives, in either direction.

Optical data transmission

A Leuze speciality worth knowing about if you meet one.

DDLS carries network data through the air, contact-free and wear-free, over distances up to 300 m.

Used on stacker cranes, shuttles, monorail systems, AGVs and cranes, where a moving machine needs a data link and a trailing cable or slip ring would wear out.

If a crane or shuttle has an optical head at each end of a runway, that is what it is. They are matched pairs and the alignment is critical.

Important: safety replacements

Light curtains, scanners and safety switches form part of a machine's certified safety function.

A like-for-like replacement of the same type preserves the existing assessment. A substitution may not. Resolution and protective field height are not interchangeable, because the mounting distance was calculated from them. Receiver class is not interchangeable, because the function set differs. Host and Guest units are not interchangeable with basic ones. And an MLD 300 is a lower performance level than an MLD 500.

We will supply exactly what you specify. If you ask for an alternative we will say what we believe is equivalent and what differs, but the decision belongs with whoever is responsible for the machine's safety. We are a parts supplier, not your safety engineer.

How to give us what we need

The type code and the 8-digit order number.

Which half you need.

The resolution and protective field height, so we can match the other half.

Any suffix. H, G or /A change what the unit does.

The connection unit, on an RSL scanner.

Whether it is a replacement or a new installation.

A photo of the end cap. Leuze prints both identifiers there.

What we can supply

Current production. MLC 300 and MLC 500 across resolutions, heights and receiver classes, MLD 300 and MLD 500 including transceivers and deflecting mirrors, RSL 400 scanners and CU connection units, MSI controllers, safety switches, the photoelectric range, plus reflectors, brackets, cordsets, optical screens and muting accessories. Quoted with a delivered lead time.

Discontinued. SOLID, COMPACTplus, RS4, RD800 and the 25B sensor series. Surplus and tested used, which keeps an existing installation exactly as assessed.

Halves and accessories. Transmitters, receivers, mirrors, connection units, reflectors and bracket sets separately.

We buy Leuze

Leuze safety devices hold real value, because a like-for-like replacement lets a plant avoid a safety reassessment.

Keep pairs together. Transmitters with receivers, transceivers with their mirrors, scanner heads with their connection units. Matched sets are worth considerably more than orphaned halves. See Sell To Us.

Common questions

Can you get a part that is not listed on your site?
Usually. The site shows what we hold, not what we can source.

Why is my transmitter a 500 and my receiver a 510?
That is Leuze's numbering. The receiver number is the feature class.

Can I use a 30 mm curtain instead of a 14 mm one?
Not without recalculating the safety distance. That is a safety assessment question, not a parts question.

Do I need both halves?
Often not. Tell us which one is damaged.

My sensor works backwards. Do I need a different one?
Probably not. Check whether the harness is on pin 4 or pin 2.

Do you supply used equipment?
Yes, where new is not available, tested and clearly described.

What is the lead time?
Ex stock items ship the next working day within New Zealand. We give you a firm lead time with the quote.

Do you quote in NZD?
Yes, in NZD including GST for New Zealand customers.

Send us your part numbers

Tell us which half you need. The transmitter is the cheaper one and it is usually the one that gets hit. Quotes in NZD including GST.

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Industech is an independent supplier of new, surplus and used industrial automation equipment. We are not an authorised distributor of, approved by, sanctioned by, or affiliated with Leuze electronic. Leuze, Leuze electronic, COMPACTplus and SOLID are trademarks of Leuze electronic GmbH + Co. KG. AS-Interface is a trademark of AS-International Association. All trademarks, brand names and part numbers are the property of their respective owners and are used here for identification purposes only. Information on this page is for identification and does not constitute a safety assessment.