BOS FLEXSENSE Sensors

The BOS FLEXSENSE optical oxygen sensors are based on the common PG13.5 standard for sensors. This design has NPT threads that allow for easy installation into flow cells for use in sample line installations. THe BOS FLEXSENSE has options for 316 Stainless, Titanium, and Hastelloy C-276 wetted materials. An optional ANSI/ISA 12.27.01 Dual Seal certified version is available for installations where the analyzer will be in a different area classification from the sensor.



BOS Flexsense




BOS3 Oxygen Ranges
  • 0 to 300ppm with 1000ppm overrange (gas)

BOS1 Oxygen Ranges
  • 0.002% to 4.2% (gas)
  • 1ppb to 1.8ppm (liquid)

BOS2 Oxygen Ranges
  • 0.21% to 25% (gas)
  • 15ppb to 22ppm (liquid)
The BOS FLEXSENSE is our most versatile optical oxygen sensor. The sensor is based on the DIN 19263 dimensions commonly used with pH and conductivity sensors. 1/2” and 1” Male NPT connections make this sensor best suited for flowcell installations where frequent access to the sensor is required. Oxygen measurement is accomplished through a replaceable luminophore sensing cap. A removable fiber optic wand is used to transmit the optical signal to/from the window. The BOS FLEXSENSE is rated for pressures up to 1,200 PSIG making it well suited for applications such as produced water. The BOS FLEXSENSE can be specified with ANSI/ISA 12.27.01 Dual Seal Certification (figure 9 & 10). This design is specified when the distance between the oxygen analyzer and the measurement point crosses different hazardous zones. If this option is specified, then a separate direct contact temperature sensor should be installed.

BOS FLEXSENSE Optical Oxygen Sensor Specifications
 Pressure Rating:  1200 PSIG (82.7 Bar) Maximum Pressure 
 Temperature Rating:     0 to 50ºC (32 to 122ºF) Operating, 90ºC (194ºF) non-continuous 
 Body Material:  316 Stainless Steel, Titanium, Hastelloy C-276
 Internal Seal Options:  Viton, EPDM, FFKM (Kalrez)