Nova Analytical Systems
Canada
270 Sherman Avenue N.
Hamilton, ON L8L 6N5
Phone: (905) 545 2003• Fax: (905) 545 4248
Email: sales@nova-gas.com or websales@nova-gas.com United States
1925 Pine Avenue
Niagara Falls, NY 14301
Phone: (716) 285-0418 • Fax: (716) 282-2937
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Designed to monitor ambient hydrogen sulfide (H2S) near industrial processes such as biogas & syngas production, landfills, in confined spaces, or any other area where H2S may be present.

Application air quality
Unit of Measure
Items Image
Model 550D
Hydrogen Sulfide Alarm Monitor, diffusion sensor 		500DR1
Model 550DR1
Hydrogen Sulfide Alarm Monitor, 1 remote sensor 		500DR2
Model 550DR2
Hydrogen Sulfide Alarm Monitor, 2 remote sensors 		Image
Model 550P
Hydrogen Sulfide Alarm Monitor, built-in pump
Method of Detection N/A Disposable electrochemical cell
Ranges Available N/A 0-20 PPM standard
Resolution N/A 1 PPM
Accuracy & Repeatability N/A ±1% of full scale or 2 PPM, which ever is higher N/A ±1% of full scale or 2 PPM, which ever is higher N/A Better than 1% of full scale or 2 PPM, which ever is higher N/A ±1% of full scale or 2 PPM, which ever is higher
Drift N/A Less than 1% of full scale or 2 PPM per week, whichever is greater
Response Time (T-90) N/A Less than 15 seconds to 90% step change
Ambient Temperature Range N/A 32 to 120°F (0 to 40°C), may be operated at lower temperature with auxiliary heater
Linearity N/A ±1% of full scale or 1 PPM, which ever is higher
Size & Weight N/A 14" H x 12" W x 8" D (35.6 x 30.5 x 20.3 cm) @ 18 lbs. (8.2 kg)
Power N/A 115 VAC, 60 Hz 220 VAC, 50 Hz
Output Options N/A 0-1 VDC 4-20 mA
Alarms N/A N/A Optional: Audible alarm with 'Acknowledge' button Optional: Dual high H2S alarm light and relays (SPDT - 5A@ 230 VAC) N/A Optional - Audible alarm with 'Acknowledge' button Optional - Dual high alarm light and relays (SPDT - 5A@ 230 VAC) N/A Optional - Audible alarm with 'Acknowledge' button Optional - Dual high alarm light and relays (SPDT - 5A@ 230 VAC)
Options N/A Cold weather package for operation to -5°F (-20°C) Fail Safe' alarms available Low flow alarm on 540P NEMA 4X enclosure (WP) Strobe light