HF scientific MicroTUV Online UV %Transmission Sensor/Sampler (large) - Manual (Page 16)

If the cuvette does not appear to be clean, use soft, lint-free tissues (i.e. Kimwipe® ) to wipe the inside then rinse
with clean water. Dry the outside completely prior to reinserting it into the optical well. Turn the cuvette into
the flow head by gripping at the top, turning clockwise, seat it with fingers only.
Place the flow head back into the sensor and lock in place by holding the flow head still while twisting the
locking collar clockwise. Turn the pump back on and restart the system.
NOTE: The instrument may have to be restarted a few times using the push button on the power supply
module if it has lost its prime during this operation.
6.3 T-STRAINER MAINTENANCE
The T-strainer is designed to keep heavy solids from plugging internal orifices within the instrument. If the
T-strainer is not cleaned periodically, components such as the pump, solenoid and flow sensor could be damaged.
The T-strainer is designed such that the solids build up between the screen and the housing so that the user can
visually see how clogged it is. If the T-strainer is clogged, turn the pump switch off. Unclip the T-strainer by
pulling it out from its retaining clip. Hold it outside the enclosure to avoid spilling water inside. You may wish
to open the T-strainer over a bucket or drain as about 300ml of water will spill as the filter is opened. Unscrew
the clear body and remove the filter screen. Clean the screen and body thoroughly. Fill the body with clean
water. Reassemble the filter assembly and return it to the clip. Turn the pump switch ON and prime the system
by resetting the instrument. The instrument may be reset by turning the power supply module switch off and then on.
NOTE: The instrument may have to be restarted a few times using the push button on the power supply
module if it has lost its prime during this operation.
6.4 DESICCANT MAINTENANCE
Proper use of the supplied desiccant is essential in maintaining the performance of the instrument. The desiccant
pouch is designed to have a long life; however, replacement of the desiccant pack will be required from time to time.
To determine the condition of the desiccant, check the included humidity indicator card. If required, a new
sealed desiccant pouch and indicator card are available from HF scientific inc. part #21555R.
It is essential that all enclosure seals be maintained. The emergency drain and o-rings that are supplied with each
new instrument form part of the instrument humidity seal. Inspect these items each time the desiccant pouch is
replaced. Replace any parts found to be defective.
NOTE: Moisture presence in the desiccant could cause erroneous readings.
Remember to dry the quartz cuvette of excess moisture before inserting it into the optical well. This will speed
up the evaporation time.
NOTE: The desiccant tray is not rechargeable.
6.5 100% T CALIBRATION SOLUTION MAINTENANCE
The 100% T calibration solution is in the 4 liter bottle that is mounted on the door of the TUV Sensor/
Sampler (Refer to figure 4). This bottle is shipped empty with the instrument and must be filled during
the installation. A full bottle is good for about 15 calibrations. Since automatic calibration cycles are user
settable, the life of a full bottle will vary. The bottle should be refilled or replaced when the level of solution
gets to within one inch from the bottom.
To replace the bottle, disconnect the hose at the quick connect. Remove the bottle to replace or refill, reusing the
provided cap equipped with the quick connect.
TUV (04/03) Page 8
REV. 0.6
Replacement bottles of 100% T solution may be ordered from HF scientific.