Hach BioTector B3500s, User Manual

Page: 98 / 166

Page 98
8.1.7 Service
S E R V I C E 0 9 : 1 7 : 2 8 1 2 - 0 9 - 0 2
1 < R E A C T I O N C O U N T E R 5 2 3 8
2 S E R V I C E R E Q U I R E D I N 1 7 8 D A Y S
3 R E S E T S E R V I C E C O U N T E R
4 S E T S E R V I C E Z E R O 2 0 , 5
5 R E S E T S E R V I C E Z E R O
The Service menu displays the system service information. It is also used to reset the service counter and
activate zero calibration cycles after the service is carried out.
1. Reaction Counter. This is the number of reactions performed by the BioTector.
2. Service Required In. This menu item specifies the number of days left before service is required. Note
that the factory setting for this counter is typical for normal site conditions, and the service interval may
have to be adjusted depending on site conditions. See Section
8.3.8 Fault Setup for details. When the
BioTector is powered up, the number of days counter of the Service Required In function keeps operating
regardless of the system is running or stopped.
3. Reset Service Counter. This menu item allows the user reset the service counter after the service has
been completed.
4. Set Service Zero. During the service of some critical component parts in the BioTector (e.g. Sample
Pump), there is a possibility for contamination of such components and this may create an unacceptable
TOC offset (particularly in low range analyzers). Zero calibration may therefore be required after the
BioTector removes contamination as it operates. If this occurs the zero calibration can be automatically
initiated using the “Set Service Zero” function. When initiated, BioTector automatically runs a total of 5
zero calibration cycles during the following 100 online measurements (default values) and automatically
adjusts the zero offset values to compensate for the removal of the contamination. It will therefore not be
necessary to revisit the BioTector after the service or to repeat the zero calibration cycle.
“Set Service Zero” function can be activated while the BioTector is running or stopped. An asterisk “*”
mark is displayed to indicate that this function is activated. If the BioTector is stopped, the service zero
calibration cycle begins when the system is started. BioTector returns online operation when the service
zero calibration cycle is completed. In the example Service menu displayed above, the first number entry
“20” displays the number of online reactions, which will be carried out before each service zero calibration
cycle. The second number entry “5” displays the total number of zero calibration cycles.
Depending on system settings, BioTector either takes DI Water as a sample or does not take any sample
during the Zero Calibration cycle. See ZERO WATER in section
8.3.4.2 Zero Program for details. If
DI Water is used during the Zero Calibration cycles, it is important that Zero Water (DI Water) is
connected to BioTector’s Zero Water port or Manual/Calibration port (if these ports are not available,
connect DI Water to Sample 1 port) before the
“Set Service Zero” is activated. Typically, less than 4 liters
of DI Water is sufficient to complete the Zero Calibration cycles during Service Zero.
5. Reset Service Zero. This menu item allows the user to deactivate or to stop the service zero calibration
cycle (see Set Service Zero function above). When the Reset Service Zero function is selected, the
a
sterisk “*” mark, which indicates the activation of Set Service Zero function, is removed. If Reset Service
Zero function is selected during one of the zero calibration cycles, BioTector returns online operation after
completing the current zero calibration cycle.