Mindray WATO EX-55Pro, Service Manual

Page: 200 / 474

7-4
No. Calibration
Item
Function
Description Calibration Occasion
5 EFCS
flowmeter
zeroing (user)
Zeros the EFCS
flowmeter. There is deviation between the zero point of flow
and actual zero points on the EFCS flowmeter.
After the fresh gas is turned off, the EFCS
flowmeter displays non-zero values.
6 O2 sensor
calibration
(user)
Calibrates the
measurement
accuracy of the O2
sensor in 21% O2
concentration and
100% O2
concentration. 1. The measured value of the O2 sensor deviates
from that of the actual value. The deviation is
greater than 3% in both air (21% O2 concentration)
and pure O2 (100% O2 concentration)
environment.
2. The O2 sensor is replaced.
3. The VCM is replaced.
7 CO2 sensor
calibration
(service)
Calibrates the
module to make it
work more
accurately. The deviation between measured value and the
actual value exceeds the standard accuracy range.
8 AG
concentration
calibration
(service)
Calibrates the
module to make it
work more
accurately. The deviation between measured value and the
actual value exceeds the standard accuracy range.
9 O2 module
calibration
Calibrates the
module to make it
work more
accurately. 1. The deviation between measured value and the
actual value exceeds the standard accuracy range.
2. The O2 module is replaced.
7.3.1 Flow Calibration (User)
NOTE

A new flow sensor must be calibrated.

The measurement accuracy of flow sensors may be affected by the operating
environment, especially when they have been used for a long time, and the tidal
volume control may also experience a great deviation correspondingly. After-sales
engineers can call users to help them resolve the deviation problem through
calibration.

Before a calibration, perform the auto circuit leak test and ensure that no leak
exists.

During a calibration, ensure that the drive gas pressure is within the specified
range. Otherwise, the calibration may fail.

When the altitude changes significantly, there may be sensor measurement errors.
In this case, errors can be corrected only by performing the flow calibration
(service).