Installation, operating and maintenance instructions for the Crowcon Xgard Air Sampling Unit (ASU).
The Xgard Air Sampling Unit (ASU) is designed to work with Crowcon’s Xgard detectors for monitoring hazardous gases in ventilation ducts. It operates on the Venturi principle and requires a duct air flow of 5‑20 m s⁻¹.
The manual provides step‑by‑step installation guidance, testing and commissioning procedures, and maintenance requirements. It includes details on positioning the unit, drilling template use, fitting grommets and probes, and ensuring no air leakage before commissioning the detector.
| Part Number | S011843 |
|---|---|
| Suitable Duct Widths | 300 mm (12") to 1500 mm (60") |
| Suitable Air Speeds | 5 m s⁻¹ to 20 m s⁻¹ |
| Operating Temperature Range | 0 °C to +60 °C |
The ASU requires an air flow rate between 5 metres per second and 20 metres per second.
Install the ASU in the centre of a straight duct section that is at least six times its width, following the drilling template and securing the unit as described.
The unit fits ducts with widths from 300 mm (12") up to 1500 mm (60").