Siemens sitrans PROBE LU User Manual

Page 80 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JB02
mmmmm
H: Parameters
2.4. Sensor Calibration
12
2.4.1. Sensor Units
Whatever units the sensor is measuring in.
3
2.4.2. Calibration Type
In Dry calibration, the user enters all four calibration values: High and Low Level
Points, and High and Low Calibration Points. In Wet calibration, the actual material
level provides the values for Low Calibration and High Calibration Points. The user
enters the corresponding Low and High Level Points.
Open the menu Device – Sensor Calibration, and click on the button for Wet or
Dry calibration.
1.
Sensor Reference Point: the point to which all of the above parameters are refer-
enced, which is the transducer face.
2.
Sensor Value: the value produced by the echo processing, which represents the dis-
tance from the Sensor Reference Point to the target.
3.
Level Value: the level measured in level units.
Hand
programmer
values
0*
Dry calibration (preferred)
1
Wet calibration
High Level Point
(default: 100%)
Sensor Reference Point
1
(transducer face)
Sensor Value
2
Level
3
Level Offset
Secondary Value 1
Low Calibration
Point
Sensor Offset
High
Calibration
Point
Low Level Point
(default: 0%)
Tank Reference Point

Siemens sitrans PROBE LU Specifications

General

Measuring Principle	Ultrasonic
Communication	HART
Output	4 to 20 mA
Power Supply	12 to 30 V DC
Process Temperature	-40 to 80 °C
Enclosure Rating	IP68
Material	PVDF
Ambient Temperature	-40 to 70 °C
Measurement Range	0.25 to 12 m (0.8 to 39 ft)