The Rosemount 928 Wireless Gas Monitor detects hydrogen sulfide (H2S), carbon monoxide (CO), and oxygen depletion (O2) in remote applications previously too challenging and costly to monitor. This wireless toxic gas monitoring system enhances worker safety through early gas leak detection, simply integrates with WirelessHART® technology, and eliminates the need for expensive wiring. The Rosemount 928 Wireless Gas Monitor easily connects to the Rosemount 628 Universal Gas Sensor which consists of a tool-less-hot-swappable smart sensor module.

Features

• Hot-swappable electrochemical sensor module with end-of-life diagnostics can be installed in the field without tools
• Replaceable, intrinsically safe lithium-thionyl chloride power module has over two years of service life and can be easily exchanged in hazardous field locations
• WirelessHART technology is secure, cost-effective and delivers >99% data reliability
• Easy, intuitive installation enables a quick method to add gas leak safety monitoring without the cost of wiring
• High performance gas leak monitoring comparable to conventional wired gas leak monitors with an accuracy of ±3 ppm or 10% of reading, whichever is greater

Specifications

Operating Temperature

H2S: -40 °F to +122 °F (-40 °C to +50 °C)
O2 Depletion: -22 °F to +122 °F (-30 °C to +50 °C)
CO: -22 °F to +122 °F (-30 °C to +50 °C)

Update Rate

1 second to 60 minutes, user selectable

Time Constant / Response

H2S:

• T20 < 8 seconds
  
• T50 < 10 seconds
  
• T90 < 45 seconds
  

O2:

• T90 < 15 seconds
  

Detection Range

H2S: Gas Concentration Level 0-100 ppm range
O2 Depletion: Gas Concentration Level 0-25 % by volume
CO: Gas Concentration Level 0-1,000 ppm range

Power Supply

Replaceable, intrinsically safe lithium-thionyl chloride power module with PBT polymer enclosure

Antenna Type

PBT/PC integrated omnidirectional antenna

Humidity Range

H2: 10-95 % Relative Humidity Non Condensing
O2: 10-95 % Relative Humidity Non Condensing
CO: 5-95 % Relative Humidity Non Condensing

Enclosure Rating

IP66 ingress protection (IP) filter

Housing Material

Low-copper aluminum (A360) or stainless steel

Certifications/Approvals

Intrinsically Safe, CSA Division 1, and ATEX/IECEx Zone 0

Outputs

IEC 62591 WirelessHART 2.4GHz DSSS. Optional discrete output to support local alarms

Accuracy

H2S: ± 3 ppm or 10 % of reading, whichever is greater
O2 Depletion: ±Within 0.5 % of oxygen content of supply gas
CO: ± 6 ppm or 10 % of reading, whichever is greater