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Remove the wiper by unscrewing in counter-clockwise direction. Secure and
retain the stainless steel spacing washer from the wiper shaft for use with the
replacement wiper.
Screw the new wiper clockwise until the arm makes contact with the seated
spacing washer, plus 1/8
th
of a turn.
DO NOT OVER TIGHTEN
. Over-
tightening may result in the wiper not operating. A
Wiper Stall
message will
be indicated at the EchoSmart Controller.
3.
Sensor Cleaning and Inspection
Remove the sensor from the process using safety procedures, protective
clothing and equipment appropriate for the process environment. Protective
gloves and eyewear should always be used when there is the possibility of
exposure to dangerous or unsanitary materials or conditions.
Carefully remove larger debris, rags and similar material that may have attached
to the sensor. Do not rotate the wiper blade by hand. Algae, slime and
accumulations of suspended solids in the process liquid should be brushed away
using a soft to medium bristle non-metallic brush or soft cloth and mild
detergent. For disinfection, use 8 oz. of regular bleach (sodium hypochlorite
8.25% solution) to one gallon of water.
Before returning the sensor for service, operate the wiper system to observe that
it rotates in the expected manner and that the wiper blade is secure. In normal
operation, the wiper blade with make 1-3 rotations when power is supplied or
when the wiper timing setting is changed.
10.1.2.
Other Routine Maintenance
Visually inspect the analyzer monthly during normal clarifier “walk downs” to
determine that there are no obvious signs of damage to the equipment and that
mounting brackets and hardware are secure. Tighten mounting bolts as may be
required.
Observe the sensor to assure that it is fully submerged below the surface of the
water and that there are no rags or similar debris wrapped around it. Clear rags and
debris from the sensor with an extension brush or by flushing with water (see 10.1.1
Sensor Cleaning and Maintenance).
If your clarifier employs a surface skimmer, watch skimmer flights as they pass the
location of the sensor to assure that the flights contact the sensor shield-rod
allowing it to flex freely and rotate the sensor out of the path of the flights. Ensure
that the shield is aligned to prevent the skimmer from making contact with the
sensor.
