The product is a battery-powered, hand-held, automatic blood pressure measurement device. Its main features include: 1. Built-in lithium battery, long battery life. 2. Using intelligent algorithms, accurate measurements. 3. Simple operation, one-button measurement, suitable for home use.
The GA501 wall‑mount combustible gas detector uses an advanced micro‑processor and a long‑life gas‑sensitive element to detect leaks of coal gas, natural gas, LPG and other combustible gases. It provides early warning with high sensitivity, smoke and alcohol resistance, and automatic temperature compensation, suitable for homes, hotels and apartments.
The manual covers technical specifications, installation positioning, wiring connections, operation procedures, fault diagnosis, maintenance schedule and safety notices to ensure reliable and safe use of the detector. This manual is written in Chinese.
| Operating voltage | AC187V–AC253V or DC12–24V (auto‑adapt, polarity‑free) |
|---|---|
| Power consumption (normal) | ≤1.5 W |
| Alarm concentration – natural gas | 5000 ppm (10 % LEL) |
| Alarm concentration – LPG | 2000 ppm (10 % LEL) |
| Alarm concentration – artificial coal gas | 800 ppm (2 % LEL) |
| Sensor lifetime | 5 years |
| Operating temperature range | -10 °C to +50 °C |
| Relative humidity (max) | ≤95 % (non‑condensing) |
| Dimensions (W×H×D) | 119 mm × 72 mm × 42 mm |
| Ingress protection rating | IP30 |
| Mounting hole spacing | 43 mm |
The detector should be tested once every six months.
The detector can be powered from AC 187‑253 V, AC 220 V, or DC 12‑24 V, depending on the model.