Guard monitoring
Machine guards and covers
Guard position monitoring on classic mechanical engineering equipment, where coding is not required but reliability is.
ConfirmConfirm switching distance and alignment.
Magnetic safety switch
PSENmag
Guards move, settle and go slightly out of true over their life. A magnetic switch tolerates that without a mechanical actuator to align, and because it works through non-magnetic materials it can be concealed entirely within the guard structure.
Magnetic action principleSwitching distance 3–8 mmUp to PL e / SIL CL 3IP65, IP67, IP6K9KATEX certificate possible
PL eEN ISO 13849-1
SIL CL 3EN/IEC 62061
3–8 mmSwitching distances
PSENmagSquare and round designs shown
PL eEN ISO 13849-1
SIL CL 3EN/IEC 62061
3–8 mmSwitching distances
IP6K9KHighest listed protection
Why it is specified
Magnetic sensing provides
The manufacturer positions the family as the highest level of safety at a low price, with a manipulation-proof concept and scope for concealed installation.
Works when concealed
The sensors remain functional even if concealed by non-magnetic materials, allowing installation inside the guard structure.
Tolerates guard movement
Non-contact operation removes the mechanical actuator alignment that a mechanical switch depends on.
Hygiene and washdown
Recommended for areas with high hygiene requirements — food, packaging and pharmaceutical industries.
Explosion-protected option
A certificate for potentially explosive areas in accordance with the ATEX Directive is possible.
Applications
PSENmag is used
The manufacturer lists the food industry, packaging technology and the pharmaceutical industry among the industry uses, and describes the family as especially suitable for classic mechanical engineering.
Hygiene areas
Food and pharmaceutical machinery
Washdown environments where a concealed, sealed sensor survives cleaning better than an exposed mechanical actuator.
ConfirmConfirm cleaning regime and required IP rating.
Explosive areas
ATEX applications
Where a certificate for potentially explosive areas is required, an ATEX route is available for this family.
ConfirmConfirm zone classification and certificate requirement.
Technical data
Selection parameters that matter
These are the values that decide the variant. Switching distance and design must be matched to the guard before an order number is fixed.
Switching distance is not a mounting gap to be maximised. It defines the assured operating range and has to be respected in both directions.
| Function | Monitoring the position of guards in accordance with EN 60947-5-3, and general position monitoring |
|---|---|
| Action principle | Magnetic |
| Performance level | Designed for applications up to PL e of EN ISO 13849-1 |
| Integrity level | Designed for applications up to SIL CL 3 of EN/IEC 62061 |
| Switching distances | From 3 to 8 mm |
| Designs | Square or round |
| Protection types | IP65, IP67, IP6K9K |
| Indication | Available with and without LED |
| Connection | Also available as a fixed cable version |
| Series connection | Suitable for series connection |
| Explosion protection | Certificate for potentially explosive areas in accordance with the ATEX Directive is possible |
| Concealed installation | Remains functional when concealed by non-magnetic materials |
Magnetic switches do not provide the coded manipulation resistance of PSENcode. Where the guard is realistically likely to be defeated with a spare magnet, review a coded device instead.
Models
Variant decisions
Four choices define the order: design, switching distance, protection type and whether an LED or fixed cable is wanted.
Design
Square or round
Selected from the mounting face available on the guard and the frame.
- Options
- 2 forms
- Standard
- EN 60947-5-3
Switching distance
3 to 8 mm
Chosen from the achievable and repeatable gap between sensor and actuator over the guard life.
- Range
- 3–8 mm
- Type
- Non-contact
Protection
IP65 / IP67 / IP6K9K
Selected from the cleaning regime and the exposure at the guard.
- Highest
- IP6K9K
- Washdown
- Suitable
Options
LED and cable version
Available with and without LED, and as a fixed cable version where a connector is not wanted.
- LED
- Optional
- Cable
- Fixed version
Accessories
Actuators, cables and evaluation
The actuator and the connection method are the two accessory decisions that recur.
Actuator
Magnetic actuator
The actuator is matched to the sensor and the required switching distance for the guard.
ConfirmConfirm switching distance and mounting.
Connection
Cables and connectors
A fixed cable version is available, or connector versions with cables selected for the run length.
ConfirmConfirm cable length and connection method.
Evaluation
Safety relay or controller
The switch provides the guard signal; a PNOZ relay or configurable controller performs the safe evaluation.
Typical pairingPNOZ relay or PNOZmulti 2.
Before quotation
Application review
PSENmag suits guards that move slightly and environments that are cleaned. If manipulation is the concern, review PSENcode.
Guard and mounting
- Guard type, weight and how it moves
- Achievable and repeatable gap between sensor and actuator
- Available mounting faces, and whether concealed mounting is wanted
- Whether surrounding materials are magnetic
Safety function
- The hazard the guard protects and the machine run-down time
- Whether guard locking is required instead of monitoring
- Target performance or integrity level, if determined
- Whether two devices are intended for the highest requirement
Environment
- Cleaning regime and required IP rating
- Whether an ATEX certificate is required, and the zone
- Temperature, vibration and contamination
- Presence of strong magnetic fields nearby
Electrical and commercial
- Number of devices and whether series connection is planned
- Existing safety controller and spare safe inputs
- LED indication and cable or connector preference
- Quantity and delivery timeline
Related technologies
PSENmag sits in the architecture
The switch reports guard position. Whether the machine reaches a safe state depends on the evaluation, the output stage and the reset arrangement behind it.
PSENcode where coding is required
PSENmech for positive mechanical action
PSENhinge for hinged guards
PSENmlock where locking is required
PNOZ relay or PNOZmulti 2 for evaluation
Contactors with feedback loop