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Setting Up and Calibrating MonoScan 43

MonoScan User Manual - 15188 Entering factor for Gas Compensation

Function Pr.09 enables you to compensate for sound velocity changes in different types of gasses. You can enter the appropriate factor for each type of gas listed on the ‘ Gas Factor Table ’ (Appendix A). For example the sound velocity in air (in room temperature) is 343 m/sec and for Methane (C
h4 ) 445.82 m/sec, therefore a factor of 445.82/343 = 1.29 should be entered to compensate for this type of gas. This factor will compensate in cases when the gas compound consists on 100% Methane. In case the gas is not pure, the sound velocity cannot be estimated and therefore a minor deviation could appear. It is recommended to use a reference measurement indicator (using a tape or other measuring device) and compare the measurement results between the MonoScan and the reference measurement indicator. If the result is correct, press ENT. If the accuracy deviation is higher than expected, continue and calibrate the factor to meet the gas maintained in the

vessel.

For example, if the gas composition consists of water and gas you can add +/- 0.01 to the factor figure already entered, to meet your application requirements. The ’Gas Factor Table’ (page 75) supports up to 33 different types of gasses. For any other type of gas, not included in this table, please refer to Solid AT Customer Support. (Support@Solidgroup.com)