Monarch Instrument DC 2000 - Manual (Page 91)

Page 5-25
Chapter 5 Programming
5.6.8 Industrial Square Root Current/Voltage Point Types
The Recorder accepts three voltage square root extraction ranges:
+150mV sqrt, +1.25 Volt sqrt, +2.5 Volt sqrt, + 12.5 and +25 Volt sqrt
and two types of linear current square root extraction ranges:
4 to 20mA sqrt, 0 to 20mA sqrt and 10 to 50mA sqrt.
This function is used for inputs which require the Industrial Square Root of the input signal (i.e. flow
measurement). The system calculates the square root of the percentage of input scale and multiplies this
value by the high end scale to produce the value of the point displayed. In the following example, the input is
4 to 20mA and the scaling is such that 0 = Low End of Scale and 1000 = High End of Scale.
High End Scale = 1000 gallons per minute
Input Signal = 12mA or 50% of scale which is equal to 0.5
Square Root of 0.5 = 0. 707
Actual value displayed is 0.707 x 1000 = 707 GPM (with decimal fix of 0)
Current input signals requires that the user provides an external resistor.
Programming Parameters - Selecting Industrial Square Root point types requires setting up parameters like
regular Programming linear point types. From the Point Type menu use the UP (
↑) or DOWN (↓) Arrow Keys to
highlight “Ind sqrt” and press ENTER. The Point Setup menu for Industrial Square Root will be displayed and
may require programming the following parameters:
Point tag Section 5.6.5.1
Input Scale Section 5.6.5.2
Output Scale Section 5.6.5.3
Exc. Currents Section 5.6.5.5
Filter Section 5.6.5.6
Engineering Units Section 5.6.5.9
Alarm Setpoints Section 5.6.5.10
Chart Scale Section 5.6.5.11
5.6.9 Logarithmic Linear Point Types
Five types of Log Linear point types can be selected, three linear voltage logarithmic ranges:
+150mV log, +1.25 Volt log, +2.5 Volt log and +12.5 Volt log and +25 Volt log,
and two types of linear current logarithmic ranges:
4 to 20mA log, 0 to 20mA log and 10 to 50mA log