ST20: Square Root Transmitter

- Squared Input

- High precision performance

- High accuracy


            The Square Root Transmitter ST20 is square root computer. It is designed to solve the equation Q = C √ΔP where ΔP is the differential pressure across an orifice, and C is a constant relating the orifice plate to engineering units. Because ST20 does not use the curve segment, biased diode technique, it provides accuracy and resolution limited only by the stability and calibration of the orifice plate and its transmitter. The ST 20 output is a standard process current or voltage signal that is linearly proportional to flow.


Analog Input

Number of channel:

1 Channel

Input type:

Current, Voltage

Input range:

Current (0 to 20, 4 to 20 mA)

Voltage (0 to 5, 1 to 5, 0 to 10 VDC)

Input - Output Equation=% Output = √100 x %Input

Analog Output

Number of channel:

1 Channel

Output type:

Current, Voltage

Output range:

Current (0 to 20, 4 to20 mA)

Voltage (0 to 5, 1 to 5, 0 to 10 VDC)


± 0.5% of span


Adjustable ± 10% of full scale output


Adjustable ± 5% of full scale output

Power Requirements

Power Supply:

24 VDC

Environmental Limits

Operating Temperature:

0 to 55 °C

Operating Humidity:

5 to 95 %RH

Storage Temperature:

0 to 70 °C

Physical Characteristics


W20 x H100 x D118 mm.


DIN Rail


Warranty Period:

5 year

Ordering Information: Specify Input, Output
Example ST20/4-20 mA/4-20mA



Package Checklist

1. ST20