ATI
Q45D/60 Dissolved Oxygen System
Part 5 – Configuration
O & M Manual
Revision C (7/09)
37 -
AC OPERATED UNITS ONLY
*Relay B Mode
Relay B can be used in a number of ways: as a setpoint
control, as an alarm, or as the control logic for an automatic
sensor cleaning system. The settings for Relay B Mode are
CON, FAIL, CLn1 and CLn2
. The first two modes function
identically to the corresponding modes on Relay A.
The CLn1 and CLn2 modes of operation enable the timer
feature for the automatic sensor cleaner. Once enabled, a
periodic automatic cleaning cycle will occur where a jet of air
is blown past the sensor membrane to dislodge any
contaminants which may have accumulated. During the
cleaning cycle, the outputs of the system are held (analog
outputs and relays) so that the cleaning cycle is invisible to
recording instrumentation, which may be connected. These
outputs are released in a “bumpless” manner once the
system automatically returns to the monitoring mode. The
timer consists of three menu items which will appear in the
CNTRL menu: Timer B CLEAN, Timer B CYCLE, and Timer
B HOLD. The CLEAN function engages the relay B contact
for a set time to operate the cleaning pump. The CYCLE
function sets the time until the next CLEAN cycle. The
HOLD setting sets the amount of delay that occurs after a
cleaning cycle to let the outputs return to normal. See these
specific function descriptions listed below for more detail.
NOTE: When CLn1 is enabled, the setting for Timer
Clean defaults to 1 minute and this value is locked.
When CLn2 is enabled, the setting for Timer Clean can
be changed. CLn1 should be selected when the ATI
Auto-Clean system is used, and CLn2 should be
selected if an alternate cleaning system is used.
Temp Units
This function sets the display units for temperature
measurement. Press ENTER to initiate user entry mode,
and the entire value will flash. Use the UP arrow key to
modify the desired display value. The choices are
°F
and
°C
. Press ENTER to store the new value.
