YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
4
pH
1.
Remove the pH sensor from the container. Holding the bottle upright, remove the bottle
covering the tip of the sensor and replace the “open” cap and o-ring with the storage cap and
store in container. If the tip of the pH sensor appears dirty, refer to the
Maintenance
section
below for cleaning techniques.
2.
Carefully rinse the sensor tip with clean tap or distilled water, TAKE EXTREME CARE to
not get the sensor connector end of the sensor wet. If you do get moisture in the connector
end, completely dry the sensor with a lint-free cloth, or ask staff for assistance with an air
compressor.
3.
Inspect the bulkhead ports for moisture or debris, clean with a
dry
lint-free cloth if need be.
If moisture can’t be reached with a cloth, ask staff to assist with an air compressor. Remove
the red connector cap and apply a
thin
coat of Krytox o-ring lubricant to the sensor o-rings
(maintenance kit). Wipe off any extra lubricant with a lint-free cloth (see image below).
4.
Carefully align the sensor into the bulkhead port rotate the sensor gently until you can feel it
align with the bulkhead. Once aligned, push the sensor into the bulkhead until it is firmly
seated in the port (see image below).
5.
Carefully tighten the retaining nut, if any resistance is felt loosen the nut and try again.
Finger tighten as much as you can, then use the sensor installation tool to tighten until snug
(see image below). DO NOT OVER TIGHTEN!
Turbidity
1.
Remove the turbidity sensor from the container. Slide the clear plastic cap from the tip of the
sensor and store in container (you may need to wiggle it off).
2.
If the tip is dirty, refer to the
Maintenance
section below for cleaning techniques.
3.
Inspect the bulkhead ports for moisture or debris, clean with a
dry
lint-free cloth if need be.
Remove the red connector cap and apply a
thin
coat of Krytox o-ring lubricant to the sensor
o-rings. Wipe off any extra lubricant with a lint-free cloth
4.
Carefully align the sensor into the bulkhead port, rotate the sensor gently until you can feel it
align with the bulkhead. Once aligned, push the sensor into the bulkhead until it is firmly
seated in the port.
5.
Carefully tighten the retaining nut, if any resistance is felt loosen the nut and try again.
Finger tighten as much as you can, then use the sensor installation tool to finish tightening.
You will not need to tighten the retaining nut much more, only a ¼ to ½ turn, DO NOT over
tighten.
If not all ports on the bulkhead will be filled, a port plug must be installed to prevent damage to
the unit.
