What to do if WatchGas PDM show a Pump Blocked error?
If you encounter a 'Pump Blocked' error with your WatchGas Gas Detectors, ensure that there are no obstructions in the hoses and filters of the detector and PDM Mono Dock. Also, verify that the gas bottle is not empty or connected improperly.
What to do if WatchGas PDM show a communication error?
If you're experiencing a communication error with WatchGas Gas Detectors, make sure the IR communication window is clean and free of obstructions.
What to do if WatchGas Gas Detectors show 'No SD Card found' error?
If your WatchGas Gas Detectors display a 'No SD Card found' error, check the SD card and ensure the Lock function is not enabled.
How to fix WatchGas Gas Detectors Dock Led that won’t turn on?
If the Dock LED on your WatchGas Gas Detectors won’t turn on, be sure there is a power connection or place 6 x 1,5 V AA batteries in the battery pack.
What to do if WatchGas PDM Gas Detectors have no configuration?
If your WatchGas Gas Detectors have no configuration, load a valid configuration onto the SD Card.
Specifies the concentration thresholds for low and high alarms for different gases.
Procedure for calibrating the detector using clean air.
Procedure for calibrating the detector using a known concentration of calibration gas.
Instructions for executing a bump test to confirm sensor response to test gas.
Technical specifications for the gases detected and measurement resolution.
Details on output, sensor technology, power, operating life, and environmental limits.
Information on weight, alarm volume, enclosure material, IP rating, and certifications.
Details of intrinsic safety standards met by the detector (IECEx, ATEX, KCS, INMETRO).
The WatchGas PDM Single Gas Detector is a portable, user-friendly device designed to monitor the presence of dangerous concentrations of specific gases in the atmosphere, such as oxygen, combustible gases, or various toxic gases. Its primary function is to alert users to potential hazards through a combination of acoustic alarms, flashing LEDs, and vibration when gas concentrations exceed predefined safety levels. This multi-faceted alert system ensures that workers are promptly notified of danger, allowing them to take immediate action, such as evacuating to a clean air location.
The PDM operates by continuously sampling the surrounding air for the target gas. The device features a gas sensor (1) that detects the specific gas it is configured for, indicated by a gas type sticker (2). The detected gas concentration is displayed in real-time on an LCD display (3). For oxygen, concentrations are shown in percent by volume (%VOL), while toxic gas concentrations are displayed in parts per million (ppm). The device also tracks and displays the maximum and minimum concentrations detected, providing a comprehensive overview of gas levels over time.
Upon activation, the PDM undergoes a stabilization period, during which it prepares its sensor for accurate readings. If stabilization fails, an 'X' symbol will appear, indicating that the device is not ready for use and may require calibration or service. Once stable, the device enters detection mode, continuously monitoring gas levels.
The PDM is equipped with a key (4) for user interaction, a beeper port (5) for acoustic alarms, and alarm LEDs (6) for visual alerts. An IR port (7) allows for communication with an optional WatchGas IR-Link, which enables users to modify settings, including alarm set points and calibration concentrations.
The PDM is designed for simple operation. To activate the device, the user presses and holds the key for three seconds. After a countdown, the monitor turns on, displaying the gas type and firmware version, followed by a stabilization countdown. Once stable, it enters detection mode.
In detection mode, the current gas concentration or remaining battery life is displayed. By pressing the key for one second, users can cycle through various display modes to view additional information. This includes:
If no button is pressed for a second, the device automatically returns to detection mode.
The PDM provides clear indications for various states and alarms:
The device also stores an event log of the last 30 events, including alarm types, alarm concentrations, and peak concentrations. This log can be transferred via the WatchGas-IR Link for record-keeping and analysis.
While the PDM is a disposable product with non-replaceable battery and sensor, it incorporates several features to ensure its accuracy and longevity, primarily through calibration and self-testing.
Calibration:
Self-Test: The PDM has a default self-test interval of 20 hours of use, which can be configured or switched off via the IR-Link. When due, an "STS" message flashes. Pressing the button initiates a test of the buzzer, LEDs, vibration, and LCD, and displays alarm thresholds. An "END" message with a checkmark indicates completion.
Bump Test: The bump test interval is configurable from 1 to 365 days, with the default being off. When a bump test is due, a "bTS" message flashes. The test involves placing the PDM in a docking station or attaching a calibration adapter with a valid gas cylinder. Pressing and holding the key for 3 seconds starts a 45-second countdown. Gas flow should be initiated within this period. A "SUC" message with a checkmark indicates a successful test, while an "FA" message with an 'X' indicates failure. Repeated failures require contacting WatchGas.
Regular fresh air calibration, self-tests, and bump tests are crucial for maintaining the device's accuracy and ensuring it reliably detects hazardous gas concentrations. The PDM is designed to be activated only when needed and to avoid prolonged alarm situations to maximize its 24-month operational life. Cleaning the exterior with a soft cloth is recommended, avoiding chemical detergents.
General| Target Gas | O2, CO, H2S, LEL |
|---|---|
| Ingress Protection | IP67 |
| Certifications | ATEX, IECEx, UL, CSA |
| Measurement Range (O2) | 0-30% Vol |
| Measurement Range (CO) | 0-500 ppm |
| Measurement Range (H2S) | 0-100 ppm |
| Measurement Range (LEL) | 0-100% LEL |
| Resolution (O2) | 0.1% Vol |
| Resolution (CO) | 1 ppm |
| Resolution (H2S) | 0.1 ppm |
| Resolution (LEL) | 1% LEL |
| Sensor Type | Electrochemical (O2, CO, H2S), Catalytic (LEL) |
| Alarm Type | Visual, Audible, Vibration |
| Battery Life | Up to 2 years |
| Response Time | T90 < 15 seconds |
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