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EXITING DATA MODE
While in Data mode, press enter to access the bottom functions. Next,
highlight the ESC-Exit box and press enter to return to the Run screen.
C A R E , M A I N T E N A N C E A N D
S T O R A G E
This section describes the proper procedures for care, maintenance
and storage of the sensors. The goal is to maximize their lifetime and
minimize down-time associated with improper sensor usage.
GENERAL MAINTENANCE
GENERAL MAINTENANCE - GASKET AND O-RINGS
The instrument utilizes gasket and o-ring seals to prevent water from
entering the battery compartment and the sensor port. Following the
recommended procedures will help keep the instrument functioning
properly.
If the gasket, o-rings and sealing surfaces are not maintained properly,
it is possible that water can enter the battery compartment and/
or sensor port of the instrument. If water enters these areas, it can
damage the battery terminals or sensor port causing loss of battery
power, false readings and corrosion to the sensors, ports or battery
terminals. Therefore, when the battery compartment lid is removed,
the gasket that provides the seal should be carefully inspected for
contamination (i.e. debris, grit, etc.) and cleaned with water and mild
detergent if necessary.
The same inspection should be made of the o-rings associated with
the pH, ORP and DO sensor connector when replacing a sensor. The
o-rings should be free of dirt or debris before installing the sensor
onto the cable. If no dirt or damage to the o-rings is evident, then they
should be lightly greased with the o-ring grease provided without
removing them from their groove. However, if there is any indication of
damage, the sensor o-ring should be replaced with an identical o-ring.
To remove the sensor o-rings:
Use a small, flat-bladed screwdriver or similar blunt-tipped tool to
remove the o-ring from its groove near the sensor connector. Check
the o-ring and the groove for any excess grease or contamination. If
contamination is evident, clean the o-ring and nearby plastic parts with
lens cleaning tissue or equivalent lint-free cloth. Alcohol can be used
to clean the plastic parts, but use only water and mild detergent on the
o-ring itself. Also, inspect the o-rings for nicks and imperfections.
Using alcohol on o-rings may cause a loss of elasticity and may
promote cracking. Do not use a sharp object to remove the
o-rings. Damage to the o-ring or the groove may result.
To re-install the sensor o-rings:
Place a small amount of o-ring grease between your thumb and index
finger. (More grease is not better!) Draw the o-ring through the grease
while pressing the fingers together to place a very light covering of
grease on the o-ring. Place the o-ring into its groove ensuring that it
does not twist or roll. Use the previously grease-coated finger to once
again lightly go over the surface of the o-ring.
Do not over-grease the o-rings. Excess grease may collect
particles that can compromise the seal. Excess grease can also
cause the waterproofing capabilities of the o-ring to diminish,
potentially causing leaks. If excess grease is present, remove it
using a lens cloth or lint-free cloth.
GENERAL MAINTENANCE - SENSOR PORTS
It is important that the entire sensor connector end be dry when
installing, removing or replacing a sensor. This will prevent water
from entering the port. Once the sensor is removed, examine the
connector inside the port. If any moisture is present, use compressed
air to completely dry the connector or let it air dry. If the connector
is corroded, contact YSI Technical Support or the YSI authorized
distributor where you purchased the instrument.
Remove sensors upside down (facing the ground) to help
prevent water from entering the port upon removal.
SENSOR MAINTENANCE
Typical working life for pH and ORP sensors is approximately
12-24 months depending on usage, storage and maintenance.
Proper storage and maintenance generally extends the sensor’s
working life.
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