PRM Engineering Height and Slew Limiter

Sentinel
Height & Slew
Limiters

Overhead Protection Systems

Enable safe operation of excavators, loaders, skid steers and backhoes near overhead powerlines, bridges and inside tunnels.

Designed and manufactured in Australia with local support, national installers and local engineering.

Safe Height and Slew Limits

SIL 2/PLd Certification Available

The only Australian-designed system with a variant that is SIL 2/MPL d.

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Height & Slew Control

Precise limits for excavators, loaders, skid steers and backhoes.

Fail-Safe Design

Failure detection and safe state response.

Queensland Rail Option

Designed and manufactured to meet Queensland Rail specifications.

Aurizon Rail Option

Designed and manufactured to meet Aurizon Rail specifications.

Australian Made

Designed and manufactured in Australia with local support.

Safety Features

Height & Slew, Height Only and Slew Only models

Motion-cut, predictive cut-off and slow-stop functionality

Suitable for railways, construction and council demands

Compatible with all machines that have articulating booms

Features both on-screen and audible alarms

Reliable and robust components for Australian conditions

Key lockable to prevent deactivation

Configurable for up to ten different attachment types

Advanced Protection Technology

Available in Height and Slew, Height Only and Slew Only versions, they can be installed on both new and existing vehicles. Each version includes an impressive range of features to ensure your machinery operates safely.

By eliminating the risk of human error, Sentinel Height and Slew limiter systems significantly improve reliability by providing consistent, real-time protection.

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Extensive Features

Height Indication Display

Fault Detection and Redundancy

Blade and Offset Boom Stop

Slow-Stop Deceleration

Ruggedised Hardware for Mobile Plant

Predictive Stop Technology

Internal Data Logging

Safety Lock Lever Input

Easy to Integrate Solution

Redundant Hydraulic Valves

Hi-Rail Integration

System Upgrades Available

Protect Your Operations

Contact PRM Engineering Services today to learn more about our Height and Slew Limiters and ensure your machinery operates safely in all conditions.

Operator Training Video Available for Download

ARISO Award Finalist
ARISO Award Finalist

Shifting the standard: Sentinel SIL Rated Height & Slew Limiter is an ARISO finalist!

PRM Engineering Services is proud to announce that their ground breaking Sentinel SIL-Rated Height and Slew Limiter was a finalist at the prestigious 2026 ARISO Rail Safety Awards. Judged by the Australian Rail Industry Standards Organisation (ARISO), this recognition highlights our ongoing commitment to developing world-class safety technologies that protect infrastructure and lives across the rail corridor. – READ MORE >