Welch Allyn 1500 Patient Monitor v.1.3.X - User Manual - Manual (Page 79)

Directions for use Monitoring and Measurements 75
IBP zero set
• Zero Set must be carried out before every application.
• To prevent incorrect measurement readings due to the sensor's physical null drift,
calibrate the sensor every 24 hours.
1. Move to the desired IBP measurement field (P1, P2) using the trim knob.
2. Press the trim knob to display the IBP menu.
3. Select Zero Set with the trim knob and press to carry out the zeroing.
4. A straight line is displayed in the IPB waveform.
IBP alarms and messages
Note Ensure the sensor is kept still during zero set. If the pressure sensor's position is
moved during zero set, this can lead to incorrect values.
Message Possible cause Suggested action
IBP needs service No IBP module detected Switch off/on.
Replace monitor.
IBP needs calibration Zero-point sensor too high/low
by more than ± 30 mmHg or
unsteady pressure
Check tube system, sensor and valves.
Re-calibrate the sensor.
IBP artifact Loose sensor contact Inspect the sensor and cable connection.
A manipulation at the sensor,
such as rinsing, has caused
variation peaks of ± 150 mmHg After rinsing, calibrate the sensor.
Incorrect IBP value
displayed Constant pressure (± 30 mmHg)
during the calibration in the
system Check tube system, sensor and valves. Set
three-way valve to ambient pressure.
Re-calibrate the sensor.
IBPs < [lower limit] Systolic pressure too low Check the patient and alarm limits.
IBPs > [upper limit] Systolic pressure too high Check the patient and alarm limits.
IBPm < [lower limit] Mean pressure too low Check the patient and alarm limits.
IBPm > [upper limit] Mean pressure too high Check the patient and alarm limits.
IBPd < [lower limit] Diastolic pressure too low Check the patient and alarm limits.
IBPd > [upper limit] Diastolic pressure too high Check the patient and alarm limits.