| Product Type | Portable Gas Leak Detector |
| Model Series | GMI Gasurveyor 500 Series |
| Battery Type | 4 'D' size Alkaline Cells or Rechargeable Battery Pack |
| Battery Life | 15 hours Alkaline or 9 hours Rechargeable |
| Dimensions | 180 x 95 x 105 mm (7.1 x 3.7 x 4.1 inches) |
| Weight | 1.7 kg (3.75 lbs) |
| Display | LCD with automatic backlighting |
| Operating Temperature | -20°C to +50°C (-4°F to +122°F) |
| Operating Humidity | 0-100% R.H. non-condensing |
| Housing Material | Moulded polypropylene case |
| IP Rating | IP54 (Dust protected and splashproof) |
| Sampling System | Integral pump with flow fail sensor; sample path protected by hydrophobic filter and automatic pump switch-off |
| Alarm - Visual | Highly visible flashing LED |
| Alarm - Audible | In excess of 80dB(A), typically 85dB(A) @ 1m |
| Response Time LEL Flammable | 3 seconds (t50); 5 seconds (t90) |
| Response Time Oxygen | 7 seconds (t90) |
| Response Time Toxics | 15 seconds (t90) |
| Flammable LEL Range | 0-100% LEL with 0.1% resolution (0-9.9%) and 1% resolution (10-100%) |
| Flammable Volume Range | 0-100% with 1% resolution |
| Flammable PPM Range | 0-1000 ppm with 1 ppm resolution |
| Oxygen Range | 0-21% and 21-25% with 0.1% and 1% resolution respectively |
| Hydrogen Sulphide Range | 0-200 ppm with 1 ppm resolution |
| Carbon Monoxide Range | 0-1000 ppm with 1 ppm resolution |
| Certifications | ATEX II 2 G EEx ia d IIC T4 (Ta = -20°C to +50°C), IECEx Ex ia d IIC T4 Gb, UL Class I Groups A, B, C and D, CSA Class I Groups ABCD C22.2 No. 152 |
| Available Models | GMI Gasurveyor 511, 512, 521, 522, 523, 524, 525, 526, 531, 532, 533, 534, 536, 541, 542 with various gas sensor combinations |