Milltronics IQ Radar 160, Инструкция по эксплуатации, Страница: 58 / 81

Page 58 IQ Radar 160/160 Ex PL-550
Parameter Descriptions
P652 Offset Correction
An offset value can be applied to the reading as a correction to the
measurement.
Note:
This parameter is automatically set when you enter parameter P004. In
addition, this parameter may have been factory set to a specific value to
accommodate options such as horn and waveguide antenna systems. A
tag on the instrument will specify the P652 value when these options have
been supplied.
Values:
-999 to 9999
Factory = 0
P655 Propagation Factor
The propagation factor (p.f.) is used to compensate for the change in the
microwave velocity, as compared with propagation in free space, when
propagation is within a still pipe (metal).
pipe size (i.d.) Propagation Factor
50 mm (2”) 0.827
80 mm (3”) 0.915
100 mm (4”) 0.955
150 mm (6”) 0.980
200 mm (8”) 0.990
Consult the factory for other sizes and propagation factor numbers.
Note: For waveguide antennas used as still pipes, this value is provided
on the product tag.
The propagation factor is constant for a
given pipe diameter, or can be determined
by comparing the radar distance reading
to the actual process material distance
(measured from the face of the IQ 160
flange).
p.f. = actual distance
IQ 160 distance
e.g. p.f. = 10.42 m = 0.827
12.6 m
Enter the propagation factor Factory = 1