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Product page: https://vutlan.com/4-20ma-sensors/13-vt420-converter-4-20ma.html

Datasheet page: https://vutlan.atlassian.net/wiki/spaces/DEN/pages/125272069/VT420+Converter+4-20mA

Physical description

Side showing output (RJ11 / RJ12) :	Side showing input (terminal plug 2 pins 5mm):

Function and purpose

The converter of direct current 4-20mA is used for measurement of constant current on 4-20mA from different 3rd party sensors and converting data into the format of an IP the Vutlan monitoring system. The system interface allows you to assign the sensor and introduce the function data conversion.

The sensor is also an analog plug-and-play sensor. It can be connected to any analog (A1-A8) port of any Vutlan monitoring system or an analog port of the VT408 / Analog extension unit. It outputs the data received from a 3rd party current loop sensor into the analog signal recognized by the Vutlan monitoring unit. You can then configure thresholds, type of 3rd party sensor,

The maximum amount of VT420 sensors connected to the Vutlan monitoring system and the maximum cable length can be extended using the VT408 / Sensor extension unit.

Use cases

Industrial Automation: The VT420 is ideal for monitoring processes where current sensors are employed, such as in automated production lines or machinery.
Environmental Monitoring: It can be used in environmental systems that rely on current-based sensors for tracking variables like temperature, humidity, or pressure.
Building Management Systems (BMS): The converter can be integrated into BMS for monitoring and controlling HVAC systems and other critical infrastructure.
Diesel backup tanks: Monitor diesel level current sensors.

Specifications

Function & purpose	Description
Device type:	Analog sensor and 4-20mA converter
Used for:	4-20mA current loop converter, sensor, adapter
Measured current:	4-20 mA
Accuracy:	2%

Communications	Description
Output:	x1 RJ-12 / RJ-11 6P4C6p4c
Input:	Terminal plug 2 pins, pitch 5mm
Maximum distance:	50 meters from the monitoring unit or VT408 extension unit

Envrironmental	Description
Operating temperature:	Optimal range: -10° C to +80° C
Operating humidity:	Min. 5% - Max. 95% (Non-Condensing)

Mechanical	Description
Size:	L60×H18×D18 mm
Weight:	60 g
Mounting:	Wall mount, rack mount
Isolation:	Galvanic isolation of 1 kV between I/O is used in a receiver.
Power Consumption:	100 mW

General	Description
Manufactured in:	Slovak Republic, E.U., Vutlan s.r.o.
HS Code:	9030 33 100
GTIN:	8588009886242
Warranty:	90 days

Package includes

Page linked https://vutlan.atlassian.net/wiki/spaces/DEN/pages/78774307

Include Page

	VT420 package contents
	VT420 package contents

How do I know that my sensor can be used together with VT420 / 4-20mA converter?

Open the documentation of your sensor to see if it has the following "output signal":

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If it does, then it can be used.

Installation instructions (hardware)

Connection of two-wire sensors and measuring converters with 4-20mA signal power supply

1. Assignment of 4-20 mA signal
The standard 4-20 mA direct current signal is widely used in measuring instruments and industrial automation means:

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R420	24.95 Ohm
U420 min	5V
Imax	24mA

Example:

CAT5e cable length 100m: Rline = 2 * 10 Ohm
The minimum voltage of the sensor Usens min = 8V

Uppower min = 8V + 5V + (24.95 Ohm + 20 Ohm) * 24mA / 1000 = 8+5+(24.95+20)*24/1000 = 14V

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5. Recommendations for choosing a power supply
If the converter allows the same poles of analog inputs to be combined, then there is no need for a multichannel power supply.
The advantage of multi-channel units is that they tend to have a small short-circuit current, and if the communication line is accidentally closed, damage to the analog input is eliminated.
The purpose of using multi-channel power supplies is to galvanically unbind all signal circuits without high costs.

Connecting the sensor to the Vutlan monitoring system

Using included cable RJ11 / RJ12 connect VT420 to any analog port of the Vutlan monitoring system A1...A8. The system uses plug and play, the sensor will be detected automatically and will appear in the system.

Sensor settings

After VT420 has been connected to the sensor following instructions from above and back to the Vutlan monitoring system, it should appear in the interface, you will find it in the "system tree" of the interface: Interface > System tree

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1	Name	The name is given by the system automatically. You can change it to anything you want. E.g. if you have a pressure sensor connected to the VT420, name it "Pressure".
2	ID	System ID of the element
3	Type	4-20mA current loop converter is a "fcurrent (function of current)" sensor
4	User-defined type	The user can define an icon of the sensor. This does not change any values and only serves as an icon. You can choose from: - no - current - factor - frequency - humidity - power - temperature - vibration - voltage
5	Class	analog
6	Hardware port	hardware port (name of the connector on the case of the device), read-only
7	Current state	Possible states: alarm, warning, normal
8	Current value	The current value displayed by the converter
9	Additional fields	Displays linear formula used for calculating the sensor current value
10	Alarm levels	Low alarm, low warning, high warning, and high alarm - are thresholds for the sensor value. Can be used inside the "logic schemes" panel for notifications and actions.
11	Expression	The linear formula can be used to tune the sensor's current value

Finding the expression formula

For example, we have a pressure sensor with a linear function. Let's take the pressure sensor "PD-39 X low pressure" as an example.

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y-4=(20-4) / (25-0) * (x-0)

y=0.64*x+4

Using the expression formula to tune the sensor

Let's say that we have a pressure sensor with an expression formula for the 4-20mA current loop y=2*(x-4).

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c) The value is calculated with the use of our expression formula.

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Usage example 1:

Example 1:

Description

Image Added

The industrial current loop 4-20mA water level sensor is monitored by the Vutlan monitoring unit