PHH-7000-Series

Thank you for your inquiry! Calibration frequency can vary greatly based on the process conditions. Daily calibration would be a safe bet with a maximum period being around a month. Unfortunately, there is no set frequency and values should be observed carefully to ensure that changes are process and not meter related

Thank you for your inquiry. The pH probe will have a shelf life of 6 to 12 months depending on the application and includes sitting on the shelf or not used.

Thank you for your inquiry. If the probe is 6 to 12 months old, it will need to be replaced in general, unless, you can shock it back using a diluted white vinegar and have the probe soak for a 5 minutes, clean and rinse. Repeat the calibration to determine whether it had been rejunvenated and can measure accordingly, if not, then, will need to be replaced.

Thank you for your inquiry on the pH meter. As a reference, you can use approximately 2 ~ 3 mL of the substance being measured, enough to cover the tip of the sensor.

Thank you for your inquiry about the conductivity meter. You will need to obtain a substance called Quinhydrone which is a reducer that generates a specific ORP value when mixed with 4 and 7 pH buffers. In a 4 buffer, saturate 1/8 gram in 50 mL of buffer and the Quinhydrone will yield a value of 265 millivolts, and a 7 buffer will yield 86 millivolts. (Unfortunately, Omega does not sell this substance.)

Thank you for your inquiry! The replacement pH electrode is still available and can be found by searching the part number PHE-7011.

Thank you for your inquiry! Unfortunately, there is no tested value for ORP that is correlated to the conductivity solution. If the error appears to be exceeding the stated accuracy (+/-2 + 1 digit) the unit may need to be calibrated. Please feel free to the flow department (flow@omega.com) with any further questions.

Thank you for your inquiry. The soaking soluiton part number is PH-SOL which comprise of a pint of 4M KCl solution and is available to purchase online.