Alarms - YOKOGAWA MuR10000 Manual

1.3

Alarms

Alarm Types
High limit on rate-of-change alarm
Measured
value
IM 04P01B01-01E
This function generates an alarm when the measured data meets a certain condition.
The alarm occurrence/release can be recorded on the chart paper. The alarm status
can be displayed on the screen. Also, alarm output relays can be used to output contact
signals when alarms occur (/A1, /A2, and /A3 options).
Number of Alarm Point Marks
Up to four alarms can be set for each channel. The 4 alarm settings are called Level 1,
Level 2, Level 3, and Level 4. The numbers do not indicate a difference in importance.
Alarm Conditions
The eight conditions below are available. The character inside the parentheses is the
symbol used to denote each alarm on the recorder.
• High Limit Alarm (H)
An alarm occurs when the input value exceeds the alarm value.
• Low Limit Alarm (L)
An alarm occurs when the input value falls below the alarm value.
High limit alarm
Alarm occurrence
Alarm release
Measured value
• Difference High Limit Alarm (h)*
An alarm occurs when the difference in the input values of two channels is greater
than or equal to the specified value.
• Difference Low Limit Alarm (l)*
An alarm occurs when the difference in the input values of two channels is less than
or equal to the specified value.
* Can be specified on channels set to delta computation.
• High Limit on Rate-of-Change Alarm (R)
The rate-of-change of the measured values is checked over a certain time (interval).
An alarm occurs if the rate-of-change of the measured value in the rising direction is
greater than or equal to the specified value.
• Low Limit on Rate-of-Change Alarm (r)
The rate-of-change of the measured values is checked over a certain time (interval).
An alarm occurs if the rate-of-change of the measured value in the falling direction is
greater than or equal to the specified value.
T 2
T 1
t 1 t 2
t 2 –t 1
Interval
The alarm value of the rate-of-change alarm is set using an absolute value. The
interval is derived using the following equation and set using the number of samples.
Interval = the scan interval × the number of samples
For the procedure to set the functions, see section 1.10, "Function Setup Guide."
Low limit alarm
Alarm
Measured
value
value
Alarm occurrence
Low limit on rate-of-change alarm
Change in the
measured value
Measured
T 1
value
Amount of change
in the setting
T 2
| T 2 –T 1 |
Time
Alarm release
Alarm value
Amount of change
in the setting
T 2 –T 1
| |
Change in the
measured value
t 1 t 2 Time
t 2 –t 1
Interval
1-7
1
2
3
4
5
6
7
8
9
10
11
12
App
Index