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the systolic or diastolic pressure was outside the measure-
ment range (
Hi
or
Lo
appears on the display)
the cuff is fastened too tightly or too loosely
(
or
appears on the display)
the blood pressure is higher than 297 mmHg for more than
1.5 seconds (
appears on the display)
pumping up takes longer than 180 seconds (
appears on
the display)
there is a system or unit error (
, , or
appears
on the display)
the batteries are almost empty
8. Cleaning and storing the device and cuff
Clean the device and cu carefully using a slightly damp cloth
only.
Do not use any cleaning agents or solvents.
Under no circumstances hold the device and cu under wa-
ter, as this can cause liquid to enter and damage the device
and cu.
If you store the device and cu, do not place heavy objects on
the device and cu. Remove the batteries.
Technical alarm – description
Should the recorded blood pressure (systolic or diastolic) lie
outside the limits specified in the section “Technical specifica-
tions”, the technical alarm will appear on the display indicat-
ing either “
  ” or “ Lo . In such cases, you should seek medical
assistance and check the accuracy of your procedure.
The limit values for the technical alarm are factory set and can-
not be adjusted or deactivated. These alarm limit values are
accorded second priority under the standard IEC 60601-1-8.
The technical alarm is a non-locking alarm and must not be
reset. The signal shown on the display will disappear automati-
cally after about 8 seconds.
9. Technical specifications
Model No. BC 28
Measurement
method
Oscillometric, non-invasive blood pres-
sure measurement on the wrist
Measurement range Cuff pressure 0 – 300mmHg,
Systolic 60-260mmHg,
Diastolic 40-199mmHg,
Pulse 40 –180 beats/minute
Display accuracy Systolic ± 3mmHg,
Diastolic ± 3mmHg,
Pulse ± 5 % of the value shown
Measurement inac-
curacy
Max. permissible standard deviation
according to clinical testing:
Systolic 8 mmHg /
Diastolic 8 mmHg
Memory 2 x 60 memory spaces
Dimensions L 83.8mmx W59.9mmx H29.4mm
Weight Approximately 92g (without batteries)
Cuff size 140 to 195mm
Permissible operating
conditions
+ 10°C to +40°C, ≤85% relative humid-
ity (non-condensing)
Permissible storage
conditions
-20°C to +50°C, ≤ 85% relative humid-
ity, 700 –1060hPa ambient pressure
Power supply
2 x 1.5V
AAA batteries
23
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