Using the[UP], [DowN] and[DIGIT soft-keys, enter the true local barometric pressure. This mercury barometer. Do NOT use the pressure reported by the weather bureau. Weather bureaus correct pressures to sea level NOTE: You may estimate the standard pressure at your altitude by using Appendix B-Pressures and Altitudes. Press[ENTER] to confirm. The message"PREssURE CALIBRATION SAVED" will be displayed, on the model 5100, as shown below. The model 5000 will display"PRESSURE SETTING SAVED" since it does not contain an internal barometer
NOTE: If you wish to abort before pressing[ENTER], you may press[MODE] to retum to the calibrate menu without saving the new value for barometric pressure. also press[NEXT] to select a different parameter(any change made will not be saved)
Salinity.
- Salt reduces the ability of water to hold oxygen in solution. Enter the salinity of the sample you are measuring and the meter will automatically compensate for the effect of salinity on dissolved oxygen. The default setting for salinity is 0.0 ppt. You can enter any value between 0,0 and 40.0 From the Calibration menu press the Do CAL) soft-key, then press the[NEXT sof-key until the salinity value is flashing. The top right corner of the screen will display"Salinity" as shown the following screen. Remember, if you are manually calibrating in mg/L in water saturated air, salinity is 0.0 ppt,