Chemtrac SCC3500XRD, Руководство по эксплуатации, Страница: 25 / 58

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Special Function Key – The audible alarm can be toggled ON and OFF by
pressing both q and p keys. The
Ù
symbol will only appear when the audible
alarm is enabled. Once the audible alarm is disabled, the only way to enable is
to toggle with this Special Function key.
When any alarm is triggered, a +24 Vdc signal will be present on the Monitor’s digital
alarm output terminals. This signal can be connected to a SCADA/DCS system to alert
the operators to an Alarm condition. In lieu of a +24VDC signal, an optional solid state
relay output is available (must be specified with order).
After being properly adjusted by the operator to match up with the upper and lower SCV
readings that typically correlate to the acceptable window of process performance, the
Hi and Lo Alarms alert the operator as to whether the SCV has exceeded acceptable
limits. A Lo Alarm signify an underfeed of chemical (even possible loss of chemical
feed) and a Hi Alarm signify an overfeed.
3.2.5 SCM2500SRD Flush Control Menu
This flush feature is an option that is available for the SCM2500XRD, see Section 3.3.7
for detail description.
3.3
SCC3500XRD READOUT, MENUS, AND CONTROLS
The menu system for the SCC3500XRD is simple to navigate; below you will find the
different screens accessible through the function keys (SETUP, ALARM, FLUSH, and
CTRL). The menu screen shows with Flush option.
3.3.1 SCC3500 Main Screen
u
v
w {
x
y
z
Definitions
u Streaming Current Value (SCV) ranges from –1000 to +1000
v
Gain , signal amplification factor, adjustable from 1X to 20X
w
Next Flushing Cycle (optional): If the unit include sensor flush feature, the
menu display the time when the next flush will occur in days, hours, and minutes.
x
Zero Offset Conditions
Offset: OUT Offset condition OUT, actual SCV is display
Offset: IN Offset condition IN, adjusted SCV is displayed and the actual
SCV value will be display to the right of OUT.
Offset Value: -1000 to +1000
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u
u