Infra-Red Transit HEAT Sensor in Aluminium Alloy Housing

Infra-red transit heat sensors are designed to trigger an alarm if the material they are monitoring exceeds a temperature of 100°C. Sensitivities can also be set above this threshold. The sensor triggers at temperatures below flame point including both embers and buried hot spots. Material being transported can be monitored on conveyor systems running at speeds of between 0.5 and 6m/s.

The sensors analyse the level of IR emissions in the wide band of 5-14μm. Their unique enhanced infra-red detectors assess black body emissions, which occur for all materials. The sensor is designed to detect a change in these emissions even at relatively low temperatures, when the material moves through its field of view.

Infra-Red Transit Heat Sensor for hazardous areas. IECEx/ATEX approved for Zones 1, 2 & 21, 22.

This unit is an early warning infra-red heat sensor, which can trigger at temperatures as low as 100°C, when monitoring materials being transported on conveyor systems, before they have reached the ember or flame condition.

Its unique dual detector enhanced Infra-red monitoring has been created to detect black heat. Black body emissions occur for all material, the sensor is designed to detect a change in these emissions even at relatively low temperatures, when the material moves through its field of view.

This unit is specifically designed for hazardous areas and is IECEx / ATEX approved for Zones 1, 2 & 21, 22.

Air purging from a compressed air feed is used to maintain a lens cleaning system that ensures the prevention of dust settling on the sensor window.

This unit incorporates within the unit a user programmable SIL switch. Option selection includes detector sensitivity settings, auto/manual reset sequence selection and single / coincidence voting from the two individual internal detectors for the alarm trip shutdown outputs.

Standard / Low Power Mode

The unit can be used in two principle operating modes. Either relay mode, with its own 24 Vdc power supply or in low power mode (as shown below), see manual for further details

System Setup

The sensor is located above or beside the materials transit path (conveyor, roadway, etc.) by means of the adjustable mounting bracket and aligned such that the monitored hazard passes through the sensor’s field of view. The distance and angle of the sensor determine the width of the monitored path. Typically conveyor widths of 1.6m to 4.2m can be monitored with a sensor mounted 1.0m to 1.5m above the conveyor at an angle of 0° to 55°

Air Purging

All infra-red transit heat and flame sensors feature air purging from a compressed air feed. This is used to maintain a positive air pressure across the sensor window to prevent dust settling. The air supply is monitored by a pressure switch which signals a fault status if the air supply fails.

Applications

• Conveyors
• Biomass
• Drying Lines
• Waste Recycling Conveyors
• Food Processing
• Production Lines