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INW - TempHion Instruction Manual
7
All active channels can be calibrated in the fi eld. Temperature channels rarely need
calibrating, however the pH, ISE, and Redox (ORP) channels should be calibrated
before fi rst use and periodically thereafter.
Environmental conditions of turbulence and temperature swings, as well as local bio-
fouling or mineral deposition, can vary considerably from site to site. Therefore, where
the sensor is to be used for long-term monitoring, it is recommended that the calibration
be initially checked frequently until a performance history is established.
See Appendix B for detailed calibration instructions.
Field Deployment
The black reference reservoir at the lower end of the TempHion
TM
Smart Sensor is
shipped fi lled with INW reference solution. (If your reference reservoir is not fi lled,
see the Maintenance section in this manual.) The black reference assembly has two
grooves. The upper groove contains a small hole that forms the liquid junction port.
During shipping and storage, an o-ring is located in the upper groove, preventing
reference solution leakage and contamination. Be sure to move the o-ring to the lower
groove before deploying, thus exposing the liquid junction port. If the o-ring continues
to cover the opening, readings will not be representative or accurate.
Be sure to move the o-ring to the lower groove before
deploying, thus exposing the liquid junction port.
(If you have the wastewater pH element, disregard the previous paragraph.)
Lower the sensor to the desired depth. Fasten the cable to the well head using tie
wraps or a weather proof strain-relief system. (Note that for shallow installations the
liquid in which the sensor is submerged must, at all times, reach high enough to cover
the sensing element cutout.)
Be sure the supplied cap is securely placed on the weather-resistant connector at the
top of the cable. Do not install such that the connector might become submerged with
changing weather conditions. The connector can withstand incidental splashing but is
not designed to be submerged.