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We are sure that you will be satisfied throughout its use!
1.
INTRODUCTION
Application
The VF05 two-wire guided microwave level transmitter is used to measure the distance, level, and volume of liquids, solids, and granules. The device can be used in
storage and reaction tanks, rigid pipelines of suitable diameter, and level reference vessels. The device is HART capable, it can be programmed using HyView software
or PACTWARE.
Operating Principle
The VF05 two-wire guided-microwave level transmitter measurement method is based on TDR (Time Domain Reflectometry) analysis of the electromagnetic pulse
traveling along the probe. The device sends nanosecond-wide, low-power pulses along an electrically conductive rod, cable, or coaxial supply line at a known rate of
light propagation speed. If the electromagnetic pulse propagating along the conductor reaches a medium boundary with a different (
r
) dielectric constant (the surface
of the measured medium or the phase boundary of two liquids), some of the energy is reflected from there. The larger and sharper the (
r
) dielectric constant change
at the boundary of the media, the better the efficiency of the reflection (e.g., 80% of the energy is reflected from a flat air-water boundary) is.
The pulse is detected and processed by the device as a voltage signal. Since the propagation speed is known, the distance of the reflecting surface can be determined
by measuring the travel time of the pulse. The travel time is the time between the start of the pulse and the arrival of the reflected pulse, and the distance traveled is
twice the distance to and from the target. The device calculates the distance from the measured time into an electric signal proportional to the distance, an output
current of 4…20 mA, and provides a
HART
output signal and displays it on the display. Other derived quantities (volume, weight, etc.) can also be obtained from the
distance data using the device software. The advantage of the described measurement technology compared to other level measurement methods is that the dust,
foam, steam, boiling, and surface turbulence have no disturbing effect.
2.
ORDER CODES
VF05
-
-
2-wire guided microwave level transmitter
Version /
Temperature
Code
Probe / Process connection
Code
Housing
Code
Probe
length
(x 10m)
Code
Probe
length
(x 1m)
Code
Probe
length
(x 0.1m)
Code
Output
Code
Transmitter
T
Coaxial
1" BSP
A
Aluminum
7
4…20 mA
+ HART
4
High-temperature
transmitter
H
1" NPT
B
Stainless
steel
9
0 m
0
0 m
0
0 m
0
1½" BSP
C
10 m
1
1 m
1
0.1 m
1
Trans
display
B
1½" NPT
H
20 m
2
2 m
2
0.2 m
2
Rod
1" BSP
R
30 m
3
3 m
3
0.3 m
3
High-temperature
trans
display
P
1" NPT
P
4 m
4
0.4 m
4
1½" BSP
S
5 m
5
0.5 m
5
1½" NPT
Z
6 m
6
0.6 m
6
Dual rod
1½" BSP
D
7 m
7
0.7 m
7
1½" NPT
E
8 m
8
0.8 m
8
4 mm cable
1" BSP
K
9 m
9
0.9 m
9
1" NPT
L
1½" BSP
V
1½" NPT
W
8 mm cable
1½" BSP
N
Note max probe lengths differ: -
1½" NPT
J
Max cable length is 30m
4 mm
dual cable
1½" BSP
T
Max length of Rod & Dual rod (both
Ø
8mm) is 3m
1½" NPT
U
Max length of Rod (
Ø
14mm) & Coaxial is 6m
4 mm FEP-
coated cable
1" BSP
F
1" NPT
G
DN40 TriClamp
X
DN40 Milch
Y
Fully PFA-coated rod / DN50
Q
4 mm fully FEP-coated cable / DN50
M
Fully PP-coated rod / DN50
I
Fully PFA-coated rod / 1½" TriClamp
O
