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Symptom 2: Pulse Search indicator appears for more than 5-10
Sensor may be improperly positioned.
Incorrect sensor may be in use.
Perfusion may be too low.
Foreign material on the sensor LEDs or photodetector may be
affecting performance.
Patient motion may be interfering with the instrument's ability
to find a pulse pattern.
Environmental motion may be interfering with the
instrument's ability to track a pulse
The sensor may be too tight, there may be excessive
illumination (e.g., a surgical or bilirubin lamp or direct
sunlight), or the sensor may be placed on an extremity with a
blood pressure cuff, arterial catheter, or intravascular line.
The DB-9 sensor connector on the N-20/N-20P may be
broken.
Symptom 3:
Patient perfusion may be too low.
Patient motion may be interfering with the instrument's ability
to find a pulse pattern.
Environmental motion may be interfering with the
instrument's ability to track a pulse.
The sensor may be too tight, there may be excessive
illumination (e.g., a surgical or bilirubin lamp or direct
sunlight), or the sensor may be placed on an extremity with a
blood pressure cuff, arterial catheter, or intravascular line.
Symptom 4:
The sensor is not connected to the instrument.
Symptom 5:
Cause
Pulse Search indicator appears after successful
measurements have been made.
Cause
Dashes (– – –) appear in the display.
Cause
Pr Err is displayed during the Power-On Self-Test (N-20P only).
seconds.
Action
Ensure the sensor is correctly applied (see
sensor directions for use).
See sensor directions for use to ensure that
the patient's weight and sensor application is
correct. Test the sensor on another person to
verify proper operation.
Check patient status. Test the instrument on
someone else, or try another type of sensor.
The N-20/N-20P will not make a
measurement if perfusion is inadequate.
Clean the test area and ensure that nothing
blocks the sensor site.
If possible, ask the patient to remain still.
Verify that the sensor is securely applied and
replace it if necessary, move it to a new site,
or use a sensor that tolerates patient
movement, such as an appropriate adhesive
sensor.
Replace the DB-9 connector (Section 4.6.6).
Action
Check patient status. Test the instrument on
someone else, or try another type of sensor.
The N-20/N-20P will not make a
measurement if perfusion is inadequate.
If possible, ask the patient to remain still.
Verify that the sensor is securely applied and
replace it if necessary, move it to a new site,
or use a sensor that tolerates patient
movement, such as an appropriate adhesive
sensor.
Action
Check all sensor connections; try substituting
another sensor. Check all extension cables. If
an extension cable is in use, remove it and
plug the sensor directly into the instrument.
Troubleshooting
4-3
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