Hach BioTector B7000i - Page 120

Page 120
CLEANING VALVE SPF
 When the CLEANING VALVE is programmed with the SPF
“Sample Pump Forward” setting or SPF/SAMPLER setting in
systems operating with BioTector sampler, cleaning valve is
powered just before and while the sample pump is running in
forward direction.
 If CLEANING VALVE is set as ON, cleaning valve is powered
just after the sample pump completes its operation in reverse
direction.
 Cleaning valve is switched off when the injection into the reactor
is complete.
 CLEANING VALVE setting is N/A (Not Applicable) for REVERSE
WASH cleaning type by default.
VALVE DELAY 0s
 VALVE DELAY (0 seconds by default) defines the delay time
which can be introduced before the activation of the Cleaning
Valve. If programmed, the Cleaning Valve activates as soon as
the VALVE DELAY time elapses. This operation allows the
system to empty the liquid sample located between the Sample
Bypass port and the Cleaning Valve during the Reverse Wash
cleaning cycle.
 VALVE DELAY setting is not applicable for FULL REACTION
and BASE WASH cleaning types.
CLEANING HIGH 0
 CLEANING HIGH (0 by default) defines the frequency of the
Cleaning Cycle if the TOC/TC result exceeds the value set in
CLEANING HIGH AL below. If the TOC/TC result is greater than
the concentration level set in CLEANING HIGH AL, the cleaning
cycle frequency defined in CLEANING HIGH is used.
 For instance, when the CLEANING HIGH setting is “5”, and if the
TOC/TC result exceeds the value set in CLEANING HIGH AL, in
the example described for CLEANING PERIOD above, one
REVERSE WASH cleaning cycle (or one FULL REACTION or
one REACTOR WASH cycle) will be carried out every fifth
analysis cycle. In other words, with the use of CLEANING HIGH
and CLEANING HIGH AL functions, the cleaning cycle can be
programmed to take place more frequently when necessary.
 CLEANING HIGH setting is not applicable for BASE WASH
cleaning type by default.
CLEANING HIGH AL 1000.0mgC/l
 CLEANING HIGH ACTIVATION LEVEL defines the
concentration level (1000mgC/l by default), over which the
Cleaning Cycle switches to the frequency setting defined in
CLEANING HIGH above.
 CLEANING HIGH AL setting is not applicable for BASE WASH
cleaning type by default.
RANGE 1
 RANGE defines the operation range to be used for the FULL
REACTION or REACTOR WASH cleaning cycles. It is used to
determine the amount of cleaning liquid injected into the reactor.
 RANGE is N/A by default for REVERSE WASH cleaning cycle
as REVERSE WASH cycle is independent of operation range.