Examples Of Calculations - Level Pro ITC 450 User Manual

ITC 450/470
User manual
0
0

10.2. EXAMPLES OF CALCULATIONS

Example 1: Selection of the permissible input range ("4-20" mode)
If in "4-20" mode the user sets "Lo r" = 20,0% and "Hi r" = 10,0%, then permissible input currents range will
be equal: 3,2 mA ÷ 22 mA. Lower border of the range is the result of calculations: 4 mA - 4 mA × 20%, and the
higher : 20 mA + 20 mA × 10%.
Example 2: The normalized In result calculation
Let the input mode = 4-20 mA. The normalized In result is calculated accordingly to the expression on page
40, so if I = 10 mA then 10 mA - 4 mA = 6 mA, and this result should be divided by the width of input range
in
(16 mA). Finally the normalized result: I
In case when input current exceeds nominal measurement range, calculations are similar. For example if
input current is equal 2,5 mA then I
≅
I = (20,5 - 4)/16 1,0313.
n
Example 3: The linear characteristic
Let the input mode = 4-20 mA, and parameters "Lo C" and "Hi C" equal to -300 and 1200 respectively. The
calculations will be done for three different input currents from example 2.
4 8
Figure. 10.4 Example of user defined characteristic
= 6/16 = 0,375.
n
≅
= (2,5 - 4)/16 -0,0938, and if input current is equal 20,5 mA then
n
12 16
www. levelprosales.com
1
20
41