Hach BioTector B3500ul User Manual

Page 154
Warning! A Torque Screwdriver with 3mm Allen bit, calibrated to 1.5 Nm (150 Ncm), is
required for the correct service of the Mixer Reactor. It is strongly recommended not to
proceed with the Mixer Reactor service procedures without a torque screwdriver. An
adjustable torque screwdriver can be obtained from a local supplier. Example specifications
and suppliers of the torque screwdriver are as follows:
Lindstrom adjustable torque driver, 40-200Ncm
Stanley Supply & Services, Inc.
http://www.stanleysupplyservices.com/product-detail.aspx?pn=419-704
RS Components Ltd.
http://uk.rs-online.com/web/p/torque-drivers/3851794/
Loosen each bolt, located on the front of the Mixer Reactor, with small steps, moving from
one bolt to another across. Remove the 4 bolts and remove the reactor motor, which
contains the diaphragm, located at the back. Hold the reactor diaphragm carefully using both
hands and turn the diaphragm anti-clockwise to unscrew. It is recommended to count the
number of turns by putting a small mark on the diaphragm during this process. Using both
hands screw in the new diaphragm (see item C7 in the service kit) and tighten it firmly. The
typical minimum number of turns to tighten the diaphragm is from 7 to 8.5 turns. If a minimum
number of 7 turns, or the number of turns counted above when the old diaphragm was
removed, is not achieved, the diaphragm must be removed and reinstalled. Push the edge of
the diaphragm down firmly into place. When the installation of the diaphragm is complete,
confirm that the diaphragm forms a “concave” shape at the center. In other words, when the
diaphragm is installed correctly, the diaphragm should curve in forming a dent at the center.
If such dent has not formed, unscrew the diaphragm, confirm that the diaphragm is installed
correctly and if necessary tighten the diaphragm more with additional turns. Confirm that the
sealing face at the back of the reactor, where the diaphragm sits, is clean. Install the reactor
motor back onto the Mixer Reactor and tighten each bolt by engaging the threads and
stopping as soon as the threads are just engaged. Tighten each bolt, with small steps,
moving from one bolt to another across. Tighten the bolts using the 3mm washers under
each bolt. The torque of the screws should not exceed 1.5 Nm (150 Ncm).
_____
Confirm that the temperature of the ozone destructor has dropped to ambient temperature
level. Open the ozone destructor. The ozone destructor should never be opened when it is
hot as the threads may seize. Confirm that the PTFE filters (discs) in the ozone destructor
are clean. If there is any material build up (e.g. white powder), wash the filters using DIW (or
tap water) and dry. Do not use compressed air or any gas to clean the filters.
_____
Replace the catalyst and PTFE wool in the ozone destructor (see item C8 in the service kit).
_____
Replace the o-ring in the Ozone Destructor (see item C6 in the service kit).
_____
Reconnect power to ozone destructor heater.
_____
Using the Simulate menu (see Section 8.1.2 Simulate for details) and referring to figure 1
and table 2 in Section 4.1.1 Analysis Enclosure, activate OZONE GENERATOR and
confirm that the Ozone Generator is working and current displayed on screen is 0.9 Amp
(±0.05 Amp). If necessary adjust the current using the Ozone Generator Current Adjustment
Potentiometer located on the Ozone Generator.
_____
Remove the tapes, which are used to seal the ends of the supplied CO
2
filter (see item C9 in
the service kit). Replace the CO
2
filter on the Base reagent container. Seal the Base
container tightly.
_____
Isolate the air supply to the analyzer. Go to Simulate menu and set MFC to 60 l/h and run the
oxygen supply until the flow drops to 0 l/h (until the oxygen tank is empty). Install the new
Hepa Filter (see item C10 in the service kit) carefully without contaminating the open tubing.
Turn the air supply on.
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Hach BioTector B3500ul Specifications

General

Brand	Hach
Model	BioTector B3500ul
Category	Measuring Instruments
Language	English