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9.0 MENU VARIABLES (
accessible with hand
held programmer)
The following Menu Variables are available: (some may be
unavailable due to the selections of certain other options)
Reference Time
: This is the time in seconds the system will
spend averaging the incoming counts. The resultant value
will be used to calculate all alarm trip and reset points.
Time Constant
: Range 0 to 999 seconds. This is the count
smoothing factor. Incoming raw counts will be filtered using
the Time Constant value to reduce statistical noise from the
detector. The longer the Time Constant, the more stable
the counts, but the longer the response time of the switch.
Count Period:
.10 to 300 seconds. The period the system
will accumulate counts before submitting the total to the
system for filtering and alarm monitoring.
Pre Scale Divider:
Range 1 to 32 in binary steps. Used in
the event the counts exceed the system’s capabilities.
Sigma Multiplier
: Range .1 to 9.9. This value is used to
calculate the alarm trip point and represents a multiplier for
one sigma of the Reference Counts.
Hysteris
is: Range 1% to 99%. Used to calculate the reset
or alarm point for level alarms. The Alarm/Reset Point is
calculated based on the type of switch selected by the
jumpers.
Buildup Timer Start %:
1 to 99%. Used ONLY for the High
Level Alarm type with Buildup Alarm enabled. It is used to
calculate the timer start point.
Detector High Fault Point:
Range 0 to 32767 counts. The
value here is absolute counts. From any count period
exceed the High Fault Point, the Failure Alarm will be
enabled. This value should be set beyond normal operating
range.
7.3 Calibration with Process Material
a) Switch on the power to the X90 and turn the
shutter handle on the source holder to the ON
position. Press the Start Ref button.
b) Lower the process level below the set limit
and the system will return.
After the switch has been calibrated using the
above method, the operation of the control relay,
NORMAL and ALARM indicators should be
checked by raising and lowering the process level
about the set limit. If all these operate as
required, the switch is considered calibrated.
7.4 Calibration without Process Material
a) Switch on the power to the X90 and turn the
shutter handle on the source holder to the ON
position. Press the Start Ref button.
b) Turn the source OFF.
c) Turn the source back ON for operation.
7.5 Response Time
The response time of the amplifier is 0.5 to 40
seconds, depending on the SPAN setting.
8.0 IMPLEMENTATION
Both styles of switches will accept 120-240VAC or
24VDC power They have two (2) relays for the three
(3) alarms: Process alarm, Buildup alarm, and Failure
Alarm. Four (4) status LED’s will occupy the front panel
and indicate the switch status. A set of terminals for
the two (2) alarm relays and the remote Reference
pushbutton will be available on each unit also.
Note that the relay outputs are wired fail-safe. The
relays are deactivated for power-fail and alarm
conditions.
Status
Fail
LED
Alarm
Relay
Rem.
Ref
LED
Normal
ON
OFF
OFF
OFF
OFF
OFF
OFF
Level
Alarm
OFF
OFF
ON
OFF
OFF
ON
OFF
Buildup
Alarm
OFF
FLASH FLASH OFF
ON
ON
OFF
Det.
Fail
OFF
ON
OFF
OFF
ON
OFF
OFF
Ref(after
button
held for
5 sec-
onds
OFF
OFF
OFF
FLASH OFF
OFF
FLASH
Det. Fail
during
Refer-
ence
OFF
ON
OFF
RAPID
FLASH
(5 SEC)
ON
OFF
RAPID
FLASH
(5
Ref
LED
Normal
LED
Level
LED
Fail
Relay
out” the incoming counts to the processor module, in
this way producing zero counts in. It is intended to be
used only when the gage is in a
Reference
condi-
tion; I.e.: empty vessel with the source open.
With the switch type set to Low Alarm and in the Ref-
erence condition, the switch would normally be in
alarm. Pushing the Push-to-Test button will clear the
alarm. With the switch set to High Alarm and in the
Reference condition, pressing the Push-to-Test but-
ton will cause an alarm. In each case, holding the
Push-to-Test button down for (2) two minutes will
also cause a Failure Alarm.
