BeneVision N22/N19 Patient Monitor Operator’s Manual 9 - 7
9.6.3 Initiating Auto Alarm Limits
The monitor provides the auto alarm limits function to automatically adjust alarm limits according to the
patient’s vital signs using. When auto limits are selected, the monitor calculates safe auto limits based on the
latest measured values. To get accurate auto alarm limits, you need to collect a set of measured vital signs as a
baseline.
To initiate auto alarm limits, follow this procedure:
1. Access the Limits page in either of the following WAYS:
◆ Select the Alarm quick key → select the Limits tab.
◆ Select the Main Menu quick key → from the Alarm column select Limits.
2. From the Limits page, select Auto Limits at the left bottom.
3. Select Ok from the popup dialog box.
Then the monitor will automatically calculate alarm limits basing on the latest measured values. Before applying
these automatically created alarm limits, confirm if they are appropriate for your patient from the Limits menu. If
not, you can adjust them manually. These alarm limits will remain unchanged until you select auto limits again or
adjust them manually.
The monitor calculates auto limits basing on the following rules:
Module Parameter Lower Limit Upper Limit Auto Limit Range
Adult/
pediatric
Neonate Adult/
pediatric
Neonate
ECG HR/PR
(bpm)
HR × 0.8 or 40
(whichever is
greater)
(HR - 30) or 90
(whichever is
greater)
HR × 1.25 or
240
(whichever is
smaller)
(HR + 40) or
200
(whichever is
smaller)
Adult/pediatric: 35 to 240
Neonate: 55 to 225
Resp RR (rpm) RR × 0.5 or 6
(whichever is
greater)
(RR - 10) or 30
(whichever is
greater)
(RR × 1.5) or
30 (whichever
is smaller)
(RR + 25) or
85 (whichever
is smaller)
Adult/pediatric: 6 to 55
Neonate: 10 to 90
SpO
2
SpO
2
(%) Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
measurement range
NIBP NIBP-S
(mmHg)
(SYS × 0.68 +
10)
(SYS - 15) or
45 (whichever
is greater)
(SYS × 0.86 +
38)
(SYS + 15) or
105
(whichever is
smaller)
Adult: 45 to 270
Pediatric: 45 to 185
Neonate: 40 to 115
NIBP-D
(mmHg)
(Dia × 0.68 +
6)
(Dia - 15) or
20 (whichever
is greater)
(Dia × 0.86 +
32)
(Dia + 15) or
80 (whichever
is smaller)
Adult: 25 to 210
Pediatric: 25 to 150
Neonate: 20 to 90
NIBP-M
(mmHg)
(Mean × 0.68
+ 8)
(Mean - 15) or
35 (whichever
is greater)
(Mean × 0.86
+ 35)
(Mean + 15 or
95)
(whichever is
smaller)
Adult: 30 to 230
Pediatric: 30 to 165
Neonate: 25 to105
Temp T1 (°C) (T1 - 0.5) (T1 - 0.5) (T1 + 0.5) (T1 + 0.5) 1 to 49
T2 (°C) (T2- 0.5) (T2 - 0.5) (T2 + 0.5) (T2 + 0.5) 1 to 49
TD (°C) Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
default alarm
limit
Same as the
measurement range
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