pHoenix XL Meters

The pHoenix XL meter no longer uses level 1 or level 2 calibrations like the previous pHoenix meter. Instead, a daily pH verification (formerly level 1) and a monthly calibration (formerly level 2) are all that your meter will need. To perform a calibration if the meter is out of tolerances 14.0 mS +/- 0.10 and 7.00 pH +/- 0.1, we recommend following the steps below:

  • Navigate to the Calibrate Screen
    1. At the Measure screen, press the MENU button, which will take you to Select Menu.
    2. Move the cursor to point to Calibrate (up and down buttons move the cursor). Press the SEL button, which will take you to Calibrate Menu.
    3. If you are using Mesa Labs Combination Solution, select Both (14-7). If you are using separate conductivity and pH solutions, select either Conductivity or pH.
    4. For Conductivity calibrations, the High selection includes 14.0 mS, 100 mS and 50 mS solutions. The Low selection includes 150 µS and 1000 µS solutions.
  • Connect, Flush and Draw
    1. Connect the meter to the standard solution; do not over-tighten the connection.
    2. When introducing a different solution to the meter, be sure to use three rapid 3 to 5 mL flushes to purge remaining fluid and air bubbles from previous solutions.
    3. Remember when in calibration mode, you are not necessarily looking for a correct answer to be displayed (the exact number you see on the standard solution bottle). What you are looking for is a consistent, stable reading. A stable reading is identified as a reading that is no longer trending up or down, and is when the final digit of the reading has either stopped or is toggling between neighboring numbers. Stable readings can only be identified when pulling solution into the meter, not during the expel.
    4. Slowly draw solution in at about 1 mL per second. Speed is important; the meter responds best to a slow steady draw. Keep your eye on the display, looking for a stable reading. When you have reached the 10 mL mark, rapidly expel the solution. Repeat the 1 mL per second draw until you obtain a stable reading.
  • Stabilize, Save and Verify
    1. When you have maintained a stable reading for 2-4 seconds, while still pulling the syringe steadily, press SEL to save your calibration value. Your meter will automatically adjust the numbers for you, so there is no need for a manual adjustment! Remember to only press SEL while pulling the syringe, not during the expel or after stopping.
    2. We recommend that you verify your meter against solution values after calibrating your meter.
Remember that there are always more resources at your fingertips. Follow the links below to find calibration guides and videos:

90XL Meters

Mesa does not ‘specify’ how often a Meter should be returned for service. The Meters are designed to be calibrated by the user in the field allowing the Meter to operate as desired until the next maintenance cycle. The pH reference has a known expected lifetime of approximately 18 months. Mesa does suggest that the Meter be returned for routine maintenance (once annually) to keep the Meter in good repair. During this time, Mesa will perform preventative maintenance on parts that have a known usage life and update any parts that may have been revised with improvements. Please follow your internal SOP (Standard Operating Procedure) regarding Meter return policies.

Legacy Syringe-Style Meters

Mesa does not ‘specify’ how often a Meter should be returned for service. The Meters are designed to be calibrated by the user in the field allowing the Meter to operate as desired until the next maintenance cycle. The pH reference has a known expected lifetime of approximately 18 months. Mesa does suggest that the Meter be returned for routine maintenance (once annually) to keep the Meter in good repair. During this time, Mesa will perform preventative maintenance on parts that have a known usage life and update any parts that may have been revised with improvements. Please follow your internal SOP (Standard Operating Procedure) regarding Meter return policies.

Solutions

For Conductivity Solutions, 18 months from date of manufacture (expiration date is indicated on the bottle).

For pH Buffer Solutions, 18 months from date of manufacture (expiration date is indicated on the bottle).

For Neo-Care, no expiration date.