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Take control of problem odors and corrosion with H₂S monitoring
Eliminating hydrogen sulfide odors and mitigating corrosion is a costly challenge for wastewater treatment plants. The durably designed GS1440 and GS2440EX hydrogen sulfide sensor from Hach are the only solutions that can give wastewater treatment plant managers full visibility into where and when the problem originates. These sensors help you to tackle this issue at the source — reducing unnecessary spending on chemical dosing.
Reliable, real-time H2S data and trends can easily be accessed via wireless or hard-wired connections, so that you will gain actionable insights into H2S levels, protect valuable assets from corrosion, and avoid public nuisance from odor.
*All sensors should be calibrated on-site with the calibration kit upon installation, and at regular intervals thereafter (every 1-6 months depending on the application). Calibration gas and kit can be purchased via https://certgas.com/
** The Cable Guard accessory should be installed with any sensors that are intended for intermittent or continuous submersion in water. Please see the accessories page for all accessory and cable options.
| Accuracy | ± 5% full scale (discrete measurement accuracy, 90-second purge of 1000 ± 20 ppm H₂S standard following single-point calibration) |
| Calibration | 1000 ppm ± 2% gas standard |
| Calibration Interval | 1 – 6 months, depending on use |
| Certifications | CE, UKCA, FCC, ISED, RCM, KC |
| Certified for hazardous environment | No |
| Cleaning | Mechanical cleaning (wipe) of sensor face for in-water installations |
| Controller Compatibility | SC4500, SC1000, SC200 Controller via Digital Gateway CDx440sc CAx440EX Field Transmitter H₂S EX |
| Dimensions (D x L) | 48.3 mm x 240 mm |
| EExp / Hazardous Location | N/A |
| Enclosure Rating | IP68 |
| Length | 240 mm |
| Lower Limit of Detection (LOD) | 1% full scale |
| Material | Stainless Steel (316 L) |
| Model | GS1440 |
| Mounting | Free hanging, in pipe or flow cell |
| Operating Temperature Range | 0 – 40 °C (32 – 104 °F) |
| Output | 4-20 mA RS232 Cellular (3G/4G) to Cloud data platform (with Field transmitter H₂S EX) |
| Parameter | Hydrogen Sulfide (H₂S) |
| Power Options | 4-20 mA loop power DC power (12-28 V) Battery powered with field transmitter H₂S EX |
| Range | Wastewater: 0 – 5 mg/L Air: 0 – 1000 ppm |
| Response Time | < 30 seconds |
| Storage Conditions | 0 – 60 °C (32 – 140 °F), relative humidity 0 – 100% |
| Warranty | 12 months |
| Weight | 1.36 kg (3.00 lb) |
| What’s included? | GS1440 Hydrogen Sulfide Sensor, protective Pelican tube and user manual |
