YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
3
Dissolved Oxygen
1.
Remove the DO sensor from the container. Slide the plastic protective cover off of the end
of the sensor; you may need to “wiggle” it back and forth to get it off.
NOTE:
Do not remove the black DO cap (this cap will twist off in a counter clockwise
direction)!
2.
Inside the plastic protective cover is a yellow sponge, inspect the sponge and take note if it
appears dry. Also inspect the tip of the sensor for fouling or other debris, if dirty clean with a
moist
non-abrasive lint-free cloth.
NOTE:
Clean the tip carefully to prevent scratches. Do not use organic solvents to clean the
ODO sensor or sensor cap.
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!
Conductivity (
NOTE:
Use care when handling this sensor to prevent damage to the exposed
thermistor (at tip of sensor).
1.
Remove the conductivity sensor from the container. Slide the clear plastic cap from the tip
of the sensor and store in container. Inspect the tip of the sensor for debris or fouling, look
into the two holes for debris or fouling. If the tip is dirty, refer to the
Maintenance
section
below for cleaning techniques.
2.
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).
3.
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).
4.
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!
If not all ports on the bulkhead will be filled, a port plug must be installed to prevent damage to
the unit.
