Designed for LNG carriers. The Gasurveyor 487 is an advanced portable gas detector with an integral pump, and has selectable dual mode operation for Confined Space Monitor (CSM) or Combustible Gas Indicator (CGI). It provides the ranges 0-100% LEL methane, 0-5% CO2, 0 to 25 O2 and 0-1000 ppm CO. The instrument provides audible and visual alarms, datalogging and automatic data transfer as standard.