The calibration information is dependent on the type of transducer used in the Gas Pressure Sensor (GPS-BTA), which changed with an update to the sensor starting in October 2011. The new calibration has different slope and intercept values.
Gas Pressure Sensor – current model
The current model started shipping in October, 2011. The label has a registered trademark (®) on the company logo.
Pressure Transducer
Honeywell SSCMRNN030PAAA5
Sensor Calibration Coefficients
⚬ kPa: slope = 51.71, intercept = -25.86
⚬ atm: slope = 0.5103, intercept = -0.247426
⚬ mm Hg: slope = 387.8, intercept = -188.044
Gas Pressure Sensor (pre-October 2011)
The older models shipped prior to October, 2011. There is no registered trademark (®) on the label.
Pressure Transducer: SenSym SDX30A4
Sensor Calibration Coefficients
⚬ kPa: slope = 46.48, intercept =0
⚬ atm: slope = 0.4587, intercept = 0
⚬ mm Hg: slope = 348.63, intercept = 0
Note: Some older software will incorrectly apply the slope-intercept calibration of the older model Gas Pressure Sensor. In most cases, our software has been updated to fix the problem. However, we have not updated versions of legacy software such as ChemBio for the original CBL.