HF scientific MicroTUV Online UV %Transmission Sensor/Sampler (large) - Manual (Page 17)

A full bottle of 100% T solution will last for about 15 calibrations. The controller or analyzer will remind you
when the bottle is empty. Replacement is essential for proper operation.
6.6 CLEANING THE INTAKE STRAINER
There is an intake strainer at the begining of the intake line that prevents large particles from entering the system.
This strainer may get clogged and have to be cleaned. It should be checked periodically by pulling the intake line
up from the channel and visually inspecting the strainer. Clean the strainer using a brush and/or pressurized water
spray. If there is build-up within the strainer, it may be soaked in a 50/50% Lime-A-Way solution.
6.7 REPLACING PUMP TUBING
TUV(04/03) Page 9
REV. 0.6
As with all peristaltic type pumps, the tubing will eventually wear out and need replacement. Replacement
tubing is available in a Pump Tubing Kit (Part # 22047). To replace the tubing, first remove the hose clamps
from the tubing at the pump head (twist clamp to disengage teeth). Pull the suction and discharge lines from
the pump head tubing (including the elbows). Rotate the pump head counterclockwise (see arrows in Figure A)
to disengage from the latch studs on the pump enclosure. Loosen the latch screws if necessary. DO NOT
REMOVE LATCH SCREWS.
Grasp the tabs on the back cover of the pump head and pull straight out to remove. CAUTION: DO NOT
LOSE THE BEARING FROM THE CENTER HOLE ON THE BACK COVER. It is not necessary to remove
the spider and bearings from the housing.
Remove the old tubing and retaining collars from the pump head. Position the spider as shown in Figure C.
Put the retaining collar on the new pump tubing as shown and position the collar in the pump head with the
open end facing outward. While rotating the spider counterclockwise, push the tubing into the housing to
center over the rollers as shown in Figure C. Replace the back cover on the pump head. BE SURE IT FITS
TIGHTLY AND FLUSH WITH THE HOUSING. Slide the pump head onto the motor drive shaft and turn it
clockwise to lock onto the 2 latch screws. Retighten the latch screws to secure the pump head. Push the
suction and discharge line elbows into the new pump tubing and secure with the hose clamps. Use pliers to
squeeze the clamps tightly. CAUTION: Hose clamps must be tightened securely to prevent leakage.
FIGURE B
FIGURE C
FIGURE A