Packing Specification

Portable Gas Detector Service:

Bump Test: This is the most frequent and important check. A bump test involves briefly exposing the detector's sensors to a known concentration of test gas to verify that the sensors respond and the alarms (audible, visual, and vibratory) are triggered. A bump test confirms that the detector is working but does not guarantee its accuracy. It should be performed daily or before each use.

Calibration: Calibration is the process of adjusting the detector's sensors to a known gas concentration to ensure accurate readings. It corrects for "sensor drift," a natural phenomenon where a sensor's sensitivity degrades over time.

Zero Calibration: Sets the baseline reading to zero in a clean air environment (or with a zero gas like nitrogen for oxygen sensors).

Span Calibration: Exposes the sensor to a certified calibration gas with a known concentration and adjusts the sensor's output to match.

Frequency: Calibration should be performed every 3 to 6 months, or more frequently depending on the operating environment (e.g., in dusty, wet, or chemically harsh conditions) and the manufacturer's recommendations.

Physical Inspection and Cleaning: Technicians will inspect the detector for physical damage, such as cracks or worn parts, and clean the sensor ports to prevent debris from blocking gas entry.

Battery and Power Check: For rechargeable detectors, the battery life and charging cycle are checked. For single-gas detectors with a fixed lifespan, the expiration date is monitored.

Documentation: A calibration certificate is issued after a successful service, detailing the "as-found" and "as-left" readings and the date of the next recommended service. This is critical for compliance and record-keeping.

Fixed Gas Detection Systems

Fixed gas detection systems are permanently installed in specific areas to provide continuous, 24/7 monitoring. They are often integrated with other safety systems like alarms, ventilation, and emergency shutdown systems.

Service Details for Fixed Gas Detection Systems:

Visual Inspection: Technicians will check the physical condition of the detectors, wiring, and conduit for signs of damage, corrosion, or tampering.

Bump Testing and Calibration: Similar to portable detectors, fixed systems require periodic bump testing and calibration.

Frequency: Most regulations and manufacturers recommend calibration at least every 6 months, and in some cases annually, to ensure the system's accuracy.

Procedure: Calibration is performed by applying a certified calibration gas to each sensor and adjusting the system's output to the correct concentration.

System and Control Panel Checks: The service extends beyond the individual detectors to the entire system:

Alarm Verification: Testing that the system's audible and visual alarms (beacons, horns) activate at the correct set points.

Relay and Output Checks: Verifying that the system correctly sends signals to other connected systems, such as activating a ventilation fan, closing a valve, or sending a signal to a central control room.

Power Supply: Checking the main and backup power supplies to ensure the system remains operational during a power outage.

·Documentation: A detailed service report and calibration certificate are provided, which are essential for regulatory compliance and safety audits. These logs track the performance of each sensor and identify any trends in sensor drift or failure.