3.1. Shall be a gold film sensor or chemiluminescence-based portable analyzer that measures hydrogen sulfide (H₂S) in ambient air. 3.2. Analyzer shall report H₂S concentrations between 0.003 to 50 parts per million (ppm). 3.3. Response time shall be less than 30 seconds. 3.4. Analyzer precision shall be: – ±0.003 ppm at 0.050 ppm – ±0.03 ppm at 0.50 ppm – ±0.3 ppm at 5.0 ppm – ±2 ppm at 25 ppm 3.5 Analyzer shallsupport data logging capability, which allows data storage during manual or automatic sampling without requiring connection to a computer (minimum capacity: 1,000 data points). 3.6 Analyzer shall support software to download recorded data from the data logger. 3.7 Analyzer shall operate on a rechargeable battery with a minimum run time of 6 hours. 3.8 Shall support active sampling only. 3.9 Analyzer shall include autozero functionality. 3.10 Analyzer shall include a hard-shell protective case for transport and storage. 3.11 Shall include the following associated accessories and spare parts: – Probe(s) – Tubing adapter(s) – Necessary tubing and filters
