Endress+Hauser Deltabar PMD75B HART, Руководство пользователя

Страница: 53 / 80

Deltabar PMD75B HART Operation
Hauser 53
10 Operation
10.1 Reading the device locking status
Display of active write protection: Locking status parameter
Menu path of local display: at the top operating level
Menu path of operating tool: System → Device management
10.2 Reading measured values
With the Measured values submenu, it is possible to read all the measured values.
Navigation
"Application" submenu → Measured values
10.3 Adapting the measuring device to the process
conditions
The following are available for this purpose:
• Basic settings using the Guidance menu
• Advanced settings using the Diagnostics menu, Application menu and System menu
10.3.1 Sensor calibration
2)
In the course of their life cycle, pressure sensors can deviate, or drift,
3)
from the original
pressure characteristic curve. This deviation is caused by physical factors and can be
corrected with a sensor calibration.
Absolute pressure sensors cannot be recalibrated.
Perform the sensor calibration. Adhere to the sequence indicated!
1. Apply the lower pressure value to the device.
2. Enter the value for the
Lower sensor trim parameter. Application → Sensor → Sensor
calibration → Lower sensor trim
 The value entered causes a parallel shift of the pressure characteristic in relation
to the current calibration.
3. Apply the upper pressure value to the device.
4. Enter the value for the
Upper sensor trim parameter. Application → Sensor → Sensor
calibration → Upper sensor trim
 The value entered causes a change in the slope of the current calibration curve.
2) Not possible with display.
3) Deviations caused by physical factors are also known as "Sensor drift".