24
Fig. 10.20
6. High/Low Ref:
Example, this temperature sensor
is a current loop sensor that outputs 4-20mA. The
BVM uses a 250 Ohm resistor to convert current to
voltage measurement.
Ohms law says:
4mA X 250 Ohms = (0.004 X 250) = 1VDC
AND
20mA X 250 Ohms = (0.020 X 250) = 5VDC
The documentation that came with this sensor
explains how 4 - 20 mA translates temperature. In
this case:
4mA (or 1VDC) = 32º F
AND
20mA (or 5VDC) = 131º F
Therefore, my reference values are 1 = 32 and 5 =
131.
Fig. 10.21
7. Log back into the unit and click
User Analogs
from the (blue)
Monitor menu
. Now you should be
able to view the live voltage reading.
