This document is an introduction to the technical service center of GasAlertMax products. The product can detect gases such as H2S, CO, O2, and LEL, and provides warranty services.
The BW D2007 GasAlertMax is a multi‑gas detector that measures CO, H2S, O2 and combustible gases (LEL). This manual provides safety information, step‑by‑step operating instructions, calibration procedures, alarm settings, and maintenance guidelines.
It also includes detailed technical specifications, battery and data‑recorder information, and fault‑handling instructions for qualified service technicians. This manual is written in Chinese.
| Operating temperature | -20 °C to +50 °C |
|---|---|
| Operating humidity | 5 % to 95 % RH (non‑condensing) |
| Factory alarm set points | CO 35 ppm/200 ppm, H2S 10 ppm/15 ppm, O2 19.5 %/23.5 %, LEL 10 %/20 % |
| Detection range – CO | 0 ppm – 500 ppm (1 ppm steps) |
| Detection range – H2S | 0 ppm – 100 ppm (1 ppm steps) |
| Detection range – O2 | 0 % – 30 % (0.1 % steps) |
| Detection range – LEL | 0 % LEL – 100 % LEL (1 % LEL steps) |
| Sensor type | Electrochemical dual‑cell (CO/H2S), electrochemical single‑cell (O2), catalytic bead (LEL) |
| Pump flow rate | 200 mL/min (minimum) |
| Display | Alphanumeric LCD |
| Battery type | Two Black & Decker VersaPak batteries |
| Battery life (NiMH) | 10‑12 hours per charge |
| Safety approvals | CSA approved; Class I Division 1 Group A‑D; Class I Zone 0 Group IIC; IECEx IIC |
The detector operates from –20 °C up to +50 °C.
With NiMH batteries the detector runs for 10‑12 hours; with NiCad batteries it runs for 7‑8 hours.
Data is stored on an MMC card and can only be retrieved by an authorized BW service representative.