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Table of Contents
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1
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2
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3
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4
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5
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5.1
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5.2
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5.3
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5.4
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5.5
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5.6
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5.7
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5.8
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5.9
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5.10
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6
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7
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8
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9
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10
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11
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12
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13
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5.8 LTC (Stainless Steel) Calibration
L and LT Leveloggers and the Levelogger Gold do not require calibration. This section is only applicable to first generation Stainless Steel LTC Leveloggers. The first generation LTC had a length of 10.2 inches and a body comprised of Stainless Steel. See Section 5.8 for calibration of the second generation, black LTC, which has a 7-inch long body comprised of Zirconium Oxide. The conductivity sensor must be calibrated for reliable conductivity measurements. If the LTC Levelogger has not been in operation for some time, it is recommended that the unit undergo a brief acclimatization session. It is recommended that the LTC Levelogger be placed in tap water for 2 - 24 hours at a fixed sampling rate of 1 minute. Calibrate the LTC Levelogger for conductivity at the start of each new monitoring project or at a minimum each new monitoring season. Calibrating the LTC Levelogger again directly after the monitoring project or season will provide information on the degree of conductivity deviation during the project or season. If necessary, readings can be corrected for any conductivity deviation in a spreadsheet program after the data has been exported. The process of conductivity calibration is performed automatically by use of the Calibration wizard. The user need only place the LTC Levelogger in a specified calibration solution. Conductivity calibration solutions are available from Solinst or any laboratory supply outlet. The conductivity range of the LTC Levelogger determines the solution required:
- 5 µS/cm range requires a calibration solution of 5,000 µS/cm
- 50 µS/cm range requires a calibration solution of 12,880 µS/cm
The solution must be between 5 Deg C and 30 Deg C during actual calibration. Temperature should remain stable during the 10 - 20 seconds it takes to perform the calibration.
From within the Levelogger Settings window, start the calibration wizard by clicking the Calibration Wizard icon  .
The wizard will guide you through the calibration process. You can exit the wizard after any step to cancel the calibration session.
- Introduction. This step is a reminder that the calibration exercise will overwrite all data currently in the LTC Levelogger and that the Levelogger must be connected with the computer during the entire calibration process. The logger must be stopped to calibrate.
- Set-up. The Levelogger Software detects the type of calibration solution required to calibrate the connected LTC Levelogger. Ensure the solution is ready. Start the calibration by selecting [Next].
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 Note: Ensure that the calibration solution covers the sensor cell grills and the logger is agitated to release entrapped air bubbles (~20ml required if using Solinst supplied test cylinder)
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- Calibration. In this step, the current sensor constant and solution temperature from the LTC Levelogger are stated. If the calibration failed, the LTC Levelogger is reset to its pre-calibration state. If the calibration succeeds, the new values are stored in the LTC Levelogger.
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