Temperature Indicator: 409-4IN
REF NO: m47/om/201
Issue NO: 04
Page 34 of 34
Square Root Linearization
The formula for square root is:
PV = Zero + [(Span - Zero)
)
/(
Vlow
Vhigh
Vlow
Vinput
]
Where: Span is the high end of process variable
Zero is the low end of process variable
Vinput is actual voltage or current value of input
Vhigh is the high end of input signal range (5V or 20mA)
Vlow is the high end of input signal range (1V or 4mA)
Example
:PV is 0-1000
Input signal range is 1-5V
Input signal is 3V
PV will be,
PV = 0 + [(1000-0)
)
1
5
/(
)
1
3
(
] = 707
Load connection
Electrical precautions during use
Electrical noise generated by switching of inductive loads can create momentary
disruption, erratic display, latch up, data loss or permanent damage to the instrument.
Use of snubber circuits across loads as shown above, is recommended.
