InsiteIG MPA-48, Manual

Page: 18 / 51

18
MAINTENANCE
The analyzer does not require any periodic maintenance. However, it may be necessary to
periodically clean the exterior of the analyzer. This may be done with a soft brush, broom or low
pressure water rinse.
DO NOT! use hi-pressure water or a pressure washer to clean
the analyzer. It is likely to be damaged during pressure washing.
The sensor must be kept clean for accurate readings. Normally, the jet clean system will adequately
perform this function.
Model 10 D.O. Sensor: In normal wastewater aeration basins the Model 10 Sensor will not require
a jet clean system; however it is important that the aqueous sample to be measured be allowed to come
in contact with the measuring surface. The sensor should be visually inspected on a monthly basis to
insure that rags and hair have not completely covered the measuring surface. During this time we
recommend rinsing the sensor with a water hose.
In systems with high bio-slim and scaling, the integrated jet clean system is recommended to prevent
the slim and scale from attaching itself to the measuring surface. If wiping the sensing element is
required, use a wet cloth, do not use a brush.
Fouling conditions at wastewater treatment facilities vary considerably from plant to plant.
Experience gained during the first few months of sensor operation will allow the plant operators to
determine their own reasonable schedule of sensor inspection. In no case should this inspection interval
exceed one year.
Model 15/15L TSS Sensor: The sensor must be kept clean for accurate readings. Normally, the jet
clean system will adequately perform this function. However, the sensor should be retrieved and
cleaned manually on a periodic basis to remove the heaviest fouling that may impair the performance of
the sensor. The frequency of this cleaning will vary depending on the application.
Model 51/52 pH/ORP Sensor:
The electrodes are shipped with a protective boot over the pH glass.
This boot should be used to keep the electrode glass wet while the electrode out of service. If the
electrode system has been unused for a long period of time, immerse the flat glass end of the
electrode(s) in tap water for at least 30 minutes. This hydrates the pH flat glass and prepares the liquid
junction of the reference electrode for contact with the test solution. To maintain response, the electrode
system should always remain wet. The preferred storage solution is pH 4.0 buffer with saturated KCl
added. Tap water will suffice for short term storage.
NOTE: Do not soak in distilled water. Utilize the pliable
storage boot provided with the electrode(s) for storage.
Electrodes which are not broken or cracked can be restored, or rejuvenated, to full response by the
following procedures:
•
Inorganic Scale Deposits - Dissolve the deposit by immersing the electrode first in 0.1M
HCl, then in 0.1M NaOH, and again in 0.1M HCl. Each immersion should be for a 5 minute
period.
•
Organic Oil or Grease Films - Wash electrode tip in a liquid detergent and water. If film is
known to be soluble in a particular organic solvent, wash with this solvent. Rinse electrode
tip in tap water.