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Rosemount™ 628 Universal Gas Sensor
rosemount-628-front-1
rosemount 628 toxic gas sensor
Rosemount 628 Sensors detect combustible or toxic gases.
These intrinsically safe Modules are compatible with the Rosemount 928 Wireless Gas Monitor. Toxic gas sensors incorporate industry-standard technology that is used in conventional wired gas detectors to bring consistent toxic gas sensing to challenging and remote locations. Combustible gas sensors use Micro‑Electro‑Mechanical Systems (MEMS) technology to classify and detect flammable gas, providing accurate results without use of calibration adjustments.
Rosemount™ 628 Universal Gas Sensor

Specs

Accuracy
Toxic (electrochemical): H2S ±3 ppm or 10% of reading (whichever is greater); CO ±6 ppm or 10% of reading (whichever is greater); O2 depletion within ±0.5% of oxygen content of supply gas
Combustible (MEMS): ±3% LEL (methane); ±5% LEL (hydrogen)
Gas classification
See Product Data Sheet for a list of gas classifications.
Gas sensor types / detection range
Toxic (electrochemical): H2S 0–100 ppm; CO 0–1,000 ppm; O2 depletion 0–25% by volume
Measurement range
Combustible (MEMS): 0 -100% LEL
Operating temperature
Toxic (electrochemical): H2S −40 to +122 °F (−40 to +50 °C); CO −22 to +122 °F (−30 to +50 °C); O2 depletion −22 to +122 °F (−30 to +50 °C)
Combustible (MEMS): −40 to +122 °F (−40 to +50 °C)
Relative humidity range
Combustible (MEMS): 5–100% RH
Response time (T90):
Toxic (electrochemical): H2S < 45 s; CO < 29 s; O2 depletion < 15 s
Combustible (MEMS): T90 < 25 seconds
Sensor technology
Combustible (MEMS): MEMS combustible sensing element (no calibration adjustments required)
Zero drift
Combustible (MEMS): 0% per year

Features

  • Compatibility: Rosemount 928 Wireless Gas Monitor (WirelessHART®)
  • Certifications/approvals: Intrinsically Safe, CSA Div 1; ANSI/ISA 92.00-2010 (R2015); ATEX/IECEx Zone 0