pH calibration on the meter is performed at either two or three points. You should calibrate with pH 7 buffer first then followed by either pH 4 and/or pH 10 buffers. The recommended frequency of calibration of pH is every 2 weeks.
ORP calibration with the ultrameter is not necessary. Due to the hazardous nature of ORP chemical standards, the ultrameter features an inbuilt electrical calibration. Frequency: Never.
Conductivity (& Resistivity and TDS)
The meter itself measures conductivity and from this reading it can calculate TDS (using a curve of results) and resistivity (the reciprocal of conductivity).There are three chemical standards that can be used and this ensures accuracy across different application types. The most appropriate depends on the composition type of your sample and the parameter you are wanting a result for. The following standards are used:
442 - For use when measuring resistivity boiler and cooling water, lakes, wells etc. Recommended standard - 442-3000
NaCl - For use when measuring TDS of seawater or brackish water. Recommended standard - NACL-14.0
KCl - for use when measuring conductivity directly. Recommended standard - KCL-7000
Recommended frequency: monthly.
Free chlorine is not measured directly, rather calculated using ORP, pH and temperature measurements. Frequency - Every 2 weeks (pH).
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