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Hydrolab Maintenance
Hach Environmental understands that this is the time of year that instruments are being pulled off the shelf and put into service as the monitoring season has begun, or is fast approaching. In either case, it is timely for us to begin to think about maintaining instruments that may have been stored for some period of time. Following is a checklist and brief description of these maintenance procedures and a list of supplies needed to complete this maintenance.
You will note that this is not an exhaustive listing of the maintenance procedures for all sensors available on Hydrolab sondes. This listing primarily addresses pH and dissolved oxygen as they are sensors common to most Hydrolab sondes and have some specific maintenance procedures. If you have questions regarding this document or regarding other sensors, please visit the sections of this website pertaining to the instrument/sensor you are interested in, or contact us at 800-949-3766. -- Technical Support, Hach Environmental
CHECKLIST:
____ pH sensor cleaned
SENSOR MAINTENANCE:
pH If the pH sensor is coated with oil, sediment, or biological growth, clean the glass with a very clean, soft, wet non-scratching cloth or cotton ball with mild soap. Rinse with tap water. If the pH sensor is dehydrated, soak for 24 hours in a pH 4 buffer solution.
pH reference electrode: There are two types of pH reference electrodes, a standard reference and an integrated reference. The porous TeflonË Junction is the most important part of the pH and ORP performance. Make sure it is clean and passes reference electrolyte solution readily. If after visual inspection of the Reference Junction it is suspected to be clogged, contaminated, or if slow probe response time persists after cleaning the pH Sensing Bulb then often the best practice id to replace the Reference Junction and Electrolyte solution.
Part numbers and item description:
Or
Dissolved Oxygen LDO (Luminescent Dissolved Oxygen): Dissolved oxygen sensor maintenance is required approximately once a year. Maintenance includes replacing the LDO sensor cap.
Part number and item description:
The Hach LDO sensor offers increased time in the field due to increased resistance to fouling, reduced sensor maintenance and calibration requirements, and eliminates DO membranes. Contact us regarding upgrading your multiprobe to include the Hach Luminescent DO technology.
Clark Cell Dissolved Oxygen- Dissolved oxygen sensor maintenance is required when the membrane covering the cell becomes wrinkled, bubbled, torn, dirty, fouled, or otherwise damaged. Maintenance includes replacing the dissolved oxygen membrane and reference electrolyte solution.
Part numbers and item description:
BATTERY REPLACEMENT If the multiprobe is equipped with an internal battery pack, the following batteries are customer-replaceable.
Quanta handheld display is equipped with 3 size C alkaline batteries. |
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