YOKOGAWA µR1800 User Manual

7 - 10 IM 4H3B1-01E
7.2 How to Set Alarms
Alarms can be set on the measured data of any channel.
If an alarm is set, and an alarm occurs, the ALM indicator will be illuminated and alarm
printout will occur.
If equipped with the optional alarm output relays, these will be activated by the
occurrence of an alarm.
Up to four alarm levels can be set per channel.
Six types of alarms are available. These are:
H High limit alarm: alarm is generated when the measured value is higher than, or
equal to, the alarm value.
L Low limit alarm: alarm is generated when the measured value is lower than, or
equal to, the alarm value.
R Rate-of-change limit on increase: high alarm is generated when the measured
value variation in the ascending direction during a selected interval is greater
than, or equal to, the alarm setting.
r Rate-of-change limit on decrease: low alarm is generated when the measured
value variation in the descending direction during a selected interval is greater
than, or equal to, the alarm setting.
Note: the selected interval is determined during rate-of-change alarm set-up. See 9.1.6.
h Difference high-limit alarm: alarm is generated when the difference between the
measured values of two channels is more than the alarm setting. (This type of
alarm can only be set when the corresponding channel is of the DELT-type.)
l Difference low-limit alarm: alarm is generated when the difference between the
measured values of two channels is less than the alarm setting. (This type of
alarm can only be set when the corresponding channel is of the DELT-type.)
NOTE Alarm settings are automatically canceled on the affected channel, when any of the
following changes occur:
• the input type (VOLT, TC, etc.) or input range (2V, etc.) is changed.
• decimal point for linear scaling and square root is changed.
•minimum or maximum value of the recording span is changed (in case of linear
scaling and square root).
•minimum or maximum value of the scale is changed (in case of linear scaling and
square root).
Difference alarm settings (h, l) are canceled when any of the following changes occur:
• the reference channel is changed.
• the input type or range of the reference channel is changed.
Measured
value
R alarm
T
Time
Selected interval (Note)
t –t
1
T
2
t
1
t
2
21
Variation
T –T
21
Measured
value
r alarm
T
Time
Selected interval (Note)
t –t
2
T
1
t
1
t
2
21
Variation
T –T
21

YOKOGAWA µR1800 Specifications

General

Brand	YOKOGAWA
Model	µR1800
Category	Data Loggers
Language	English