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6.2 Cuvette Replacement
HF scientific recommends that the cuvette be replaced annually or if it
appears badly soiled or discolored at any time. It is suggested to place
a covering over a floor grate if the instrument is installed over a grate.
To replace the cuvette:
Step 1: Press SERVICE to stop the flow of sample water and drain
the cuvette.
Step 2: Ensure the source water is turned off.
Step 3: Turn counterclockwise, but do not completely remove, the
knurled fitting on top of the optics system to loosen the
cuvette. Occasionally it is necessary to very gently rotate the
cuvette on the O-rings to facilitate removal. Once the cuvette
rotates easily on the O-rings carefully remove the cuvette.
There is a spring installed in the optical block to facilitate
removal of the cuvette.
Step 5: Reverse the procedure to install a new or cleaned cuvette.
Step 6: Retain the removed cuvette for future use if it can be cleaned.
Refer to Figure 5 - Wet Chemistry Area of Enclosure
Install the new cuvette by pushing it firmly but gently to seat it on the
O-rings, carefully turn the knurled top clockwise until the cuvette is held
level and securely against both the top and bottom O-rings, do not
overtighten. Return to normal operation.
6.3 T-Strainer Cleaning
The T-strainer is integral to the instrument and must be checked when
changing the reagent. When necessary the T-strainer screen and bowl
must be cleaned. The T-strainer is clamped to the door and does not
require removal to be cleaned. You may want to place a container
under the instrument to catch the water and debris during cleaning.
Step 1: Press SERVICE to stop the flow of sample water and drain
the cuvette.
Step 2: Ensure the source water is turned off.
Step 3: Disconnect the top (bowl) of the T-strainer by turning
counterclockwise.
Step 4: Remove and clean the screen and the bowl and then
reassemble.
Step 5: Be sure to tighten the bowl of the strainer.
Step 6: Turn source water back on.
Step 7: Return to normal operation.
Step 8: Check for any leaks.
The T-strainer screen (Cat. No. 28625) may require replacement after a
period of time or as needed.
6.4 Adjusting the Pressure Regulator
The pressure regulator is factory set and it should not be necessary to
adjust it in the field.
6.5 Installing New Reagent in the SSR-Ex
Use caution when changing the reagents, as they are corrosive. These
reagents may stain clothing. After changing the reagents, operators
should wash their hands.
Step 1: Press SERVICE to stop the flow of sample water and drain
the cuvette.
Step 2: Ensure the source water is turned off.
Step 3: Remove both reagent bottles by unscrewing cap assembly.
Step 4: The buffer is installed on the right and the indicator is installed
on the left.
Step 5: Once bottles are secure in the bracket, wrap the Velcro
around both bottles to ensure they do not move.
Step 6: Screw cap on the bottle and ensure a tight fit. Ensure tubing
is fully submerged at the bottom of the bottle.
Step 7: Follow the PRIME procedure under the SERVICE menu.
This will draw enough of each reagent to completely prime
the tubes and replace any old solution. The system will
automatically return to normal operation after it completes the
prime.
6.6 Replacing the Peristaltic Sample
Pump Head
The pump head assembly can be replaced. Recommended replacement
for the pump head assembly is annually. It is replaced as a complete
assembly, not just the pump tube. The pump is located in the upper
right of the wet enclosure.
Step 1: Press SERVICE to stop the flow of sample water and drain
the cuvette.
Step 2: Ensure the source water is turned off.
Step 3: Squeeze the right side of the pump housing, this will release
the pump head from the bracket and a new pump head can
be installed.
Step 4: Disconnect the inlet and outlet sample tubes from the pump
once it has been removed from the pump base taking care to
note which tube connects to which side of the pump head.
Step 5: Connect the inlet and outlet sample tubing to the new pump.
Step 6: Carefully replace the pump head in the enclosure.
6.7 Instrument Storage
If the SSR-Ex is relocated or will be inactive for long periods of time
(several months).
Step 1: Press SERVICE to stop the flow of sample water and drain
the cuvette.
Step 2: Ensure the source water is turned off.
Step 3: Remove the reagents.
Step 4: Flush the reagent sample lines with distilled water. Flush the
reagent system.
Step 5: Remove power by disconnecting the mains power.
Step 6: It is usually a good idea to disconnect or shut off the source
water for the duration of storage.
To order any accessory or replacement part, please contact the HF
scientific Customer Service Department. If for any reason technical
assistance is needed regarding this instrument, please do not hesitate
to contact the HF scientific Technical Services Department.
