Hach BioTector B3500s, User Manual

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Page 152
10.2 Six Month Service
Below procedure is a recommended check list for the 6
th
month service on the BioTector using the 6 Month
Service Kit. Please note that any special models and applications may require additional service items.
Service procedures may be changed without notice due to the continuous research and development
program. Therefore, please refer to the service check list supplied with the service kit for most up to date
information.
Detailed service procedures are available in a presentation format in the MMC/SD card shipped with the
BioTector. It is recommended to review this document before starting the service procedures.
Service should only be carried out when “SYSTEM STOPPED” message is displayed on the top left
corner of the main Analysis Data screen or when the system is powered down.
When “REMOTE
STANDBY” or “SYSTEM RUNNING” message is displayed on the screen, stop the BioTector using the
“Finish & Stop” or “Emergency Stop” function.
For system and personal safety, all reagent lines should be washed with water and then purged with air
before the service procedures are carried out. In order to wash the reagent lines, connect all reagent dip
tubes to a DI
W (or tap water) container. Go to Zero Calibration menu and activate “RUN REAGENT
PURGE” function to wash the reagent lines with water (see Section
2.3.1 Zero Calibration for
details). When the reagent purge with water is completed, remove the tubes from the water container
and place them open to air. Using the same menu, select the “RUN REAGENT PURGE” function one
more time to purge the reagent lines with air. As the system may still contain small traces of reagents
after the reagent purge cycles, it is strongly recommended to take the necessary safety precautions,
such as wearing eye protection and gloves throughout the service.
(If the reagents lines do not fill with DIW
during the Reagents Purge cycle, raise the DIW container above the height of the BioTector, go to Zero Calibration
menu and select the RUN REAGENTS PURGE function again.)
Disconnect power to ozone destructor heater. The ozone destructor should never be opened
when it is hot as the threads may seize.
_____
Replace the 6.4mm OD, 3.2mm ID EMPP 562 tubing used in the Sample Valve (see item C1
in the service kit) .
_____
Check the rollers on the rotor of the WMM60 Sample Pump manually and confirm that they
are rotating freely.
_____
Replace the tubing (6.4mm OD, 3.2mm ID EMPP 562 tubes) of the WMM60 Sample Pump.
The WMM60 replacement tubes are supplied in the service kits
(see item C2 in the service
kit). The overall length of the tube is 156.5mm. If process conditions require this tube to be
changed every 3 months, an additional tube is supplied in the service kit.
_____
Replace the 6.4mm OD, 3.2mm ID EMPP 562 tubing used in the pinch valves (see item C1
in the service kit) and any PP (Poly-Propylene) Y fittings (see item C3 in the service kit) in the
analyzer. If additional Y fittings are required they should be ordered separately.
_____
Disconnect the PFA fitting above the cooler. Remove the three nuts and open the analysis door. Using
the Simulate menu (see Section
8.1.2 Simulate for details) and referring to figure 1, figure 2 and
table 2 in Section 4.1.1 Analysis Enclosure , check and confirm that the valves are operating and
there are no leaks:
Check Sample Valve, MV4. _____
Check Reactor Valve, MV3 operation. When the valve is activated, the LED on the valve
should be on.
_____
Check Exhaust Valve, MV1. When the valve is activated, the LED on the valve should be on. _____
Check all the other valves (e.g. multi-stream valves) if installed in the BioTector. _____
Check and confirm that MANUAL/CALIBRATION ports are not blocked or isolated.
_____