Michell Instruments XZR500ST, User Manual

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XZR500 User’s Manual
Michell Instruments 23
OPERATION
Alarm 1
Type Alarm 1
2.00
1. The ‘type of alarm’ screen is used to set-
up the direction for the Alarms 1 and 2
to the values ‘High’ and ‘Low’. The ‘High’
alarm will be activated when increasing
the signal value to above the set-point
level. The ‘Low’ alarm will be activated by
decreasing the signal value to below the
set-point level.
Values higher than 1.00 indicate that the alarm type will be ‘High’. Values lower than
1.00 indicate that the alarm type will be ‘Low’. Press the [+] and [–] keys to modify
the value. Press the [*]
Enter
key to con fi rm the selection and move to the next
parameter.
High Alarm 1
2.00
2. Depending on the selection in step 1, the
next page shows High/Low set-point of
Alarm 1. Press the [+] and [–] keys to
modify the set-point and press the [*]
Enter
key to con fi rm the selection and
move to the next parameter.
NOTE: If the alarm is set as Low alarm this page will display ‘Low Alarm 1’
accordingly
NOTE: This set-point value is in %. For example, 2.00 equals 2%. The value
can be set between 0 and 200%.
Alarm set-point = (alarm level/max value of the scale) x 100
Example 1:
Selected range is 1-1,000 ppm.
The desired alarm is at 600 ppm.
Calculation:
%= (600 ppm*100)
/1000 ppm = 60
The set value has to be 60 as
600ppm represents 60% of
the range
Example 2:
Selected range is 10-10,000 ppm.
The desired alarm is at 600 ppm.
Calculation:
%= (600 ppm*100)
/10,000 ppm = 6
The set value has to be 6 as
600ppm represents 6% of the
range
Example 3:
Selected range is 1 ppm to 25%
logarithmic. The desired alarm is
at 600 ppm.
Calculation:
%= (600 ppm*100)
/250,000ppm = 0.24
The set value has to be 0.24
as 600ppm represents 0.24%
of the range
Table 6 Alarm Set-Point Examples
Alarm 2
To con fi gure Alarm 2, repeat steps 1 and 2 as shown in Alarm 1.