Hach BioTector B7000i - 8.3.4.2 Cleaning Program

Page 119
8.3.4.2 Cleaning Program
The parameters in Cleaning Program menu identifies the operation of the specific cleaning cycle built and programmed for each
specific analyzer.
CLEANING TYPE BASE WASH
 Systems, programmed to operate with the BASE WASH
cleaning type, carries out sample tubing wash cycle at a
programmable frequency, and if necessary a reactor wash cycle
using the base reagent.
 When CLEANING TYPE is programmed as REVERSE WASH,
and if a STREAM REVERSE time is set in Sample Pump menu
(see Section 8.2.2 Sample Pump for details), the Sample
Pump runs reverse with the Cleaning Valve activated to wash
the sample lines automatically using the BioTector oxidized
sample liquid.
 During the Span Calibration and Span Check reactions, the
REVERSE WASH cleaning cycle operation is automatically
blocked by the software.
 During Manual sample analysis, the REVERSE WASH cleaning
cycle is deactivated by default with the MANUAL REVERSE time
set to 0 seconds. In order to utilize the reverse wash cleaning
cycle during manual sample analysis, system requires a Manual
Bypass Valve, which redirects the oxidized liquid back into drain.
 When the CLEANING TYPE is programmed as FULL
REACTION, an external cleaning liquid is injected into the
reactor and oxidized with a complete reaction cycle.
 If the CLEANING TYPE is programmed as REACTOR WASH,
an external cleaning liquid is injected into the reactor and mixed
for the REACTOR WASH TIME programmed below.
 Systems built and programmed with the BASE WASH and/or
REVERSE WASH cleaning cycles cannot run FULL REACTION
or REACTOR WASH cycles. In order to change the cleaning
type in a BioTector, several mechanical and system
configuration changes are required.
CLEANING START FIRST
 CLEANING START determines whether BioTector to start the
cleaning cycle before (FIRST by default) or after (LAST) the
number of reactions programmed in CLEANING PERIOD below.
CLEANING PERIOD 1 , 1
STREAM 1 100
STREAM 2 100
STREAM 3 100
…………… …
STREAM 6 100
 In CLEANING PERIOD 1 , 1 setting, the first point “1 by default”
defines the number of analysis cycles between each cleaning
cycle, and the second point “1 by default” defines the number of
the cleaning cycles to be performed. The default settings of “1 ,
1” is the recommended setting for REVERSE WASH cleaning
cycle.
 For instance, if the CLEANING PERIOD setting is “10 , 1”, one
REVERSE WASH cleaning cycle (or one FULL REACTION or
one REACTOR WASH cycle) is carried out every tenth analysis
cycle.
 A setting of “0 , 1” inhibits the cleaning cycles.
 In BioTectors operating with BASE WASH cleaning cycle, the
system carries out the base wash cleaning at the programmed
analysis cycle (every 100 reactions by default) for each stream
(STREAM 1-6).