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2-Wire passive intelligent loop (LED) Display meter SY LED4
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Updated: 2018-09-05 15:04:42
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Keywords: voltage   to   current   converter,current   to   voltage   converter,4-20ma   loop   power,4-20ma   output  
SunYuan  SY LED4 4-Digit 2-wire Passive Intelligent 4-20mA Current LED Display Meter input is
passive signal, output 2 lines can be connected to the transmitter 4-20mA loop in serial. It can display decimal
number in linearity as set through 4-20mA analog signal in the loop. SY LED4 series Display meter is
designed on the base of 2-wire passive mode; it measures the electric signal which can be used as the input
signal of the display meter and the operating power supply of the display meter. The LED display meter
operates without power supply, low cost, high precision, small size, so it is very convenience to use. The
traditional analog display meter uses potentiometer to do adjust parameters, it is not convenience and very
easy to be effected by temperatures. Compared with traditional analog display meter, the LED display meter is
set by 2 buttons and controlled by CPU, the zero, span, decimal, alarm, delay time, etc parameters can be set
by users, it is much more flexible and convenient in use. The LED display meter has use LED display board
and operates in continuous voltage, in the 4-20mA measuring range, the display digits are in equal and stable
brightness. The LED display meter has anti-reverse connection, over-current protection and is widely applied
in industrial site, oil, environment monitor, temperature, pressure, flow, level measuring, etc site and fields. In
the actual applications, the LED display meter converts temperature, pressure, flow, level, etc physical
quantity into 4-20ma signal, then connect with SY LEED4 type display meter, the LED Display meter displays
the temperature, pressure, flow, level, etc physical quantity to provide convenience for user to monitor and
control the industrial site.
SYLED4 Display Meter is used to measure 4-20mA DC current signal, it does not need power supply and
get power from 4-20ma current loop. The digit displayed is not the actual current value, it is the preset value of
4mA, 20mA, and displays the current valued measured based on the preset value in linearity method. E.g.:
4mA is set to 0, 20mA is set to 8000, then if input is 8mA, the meter displays 2000, input is 12mA, the meter
displays 4000. If 4mA is set to 1000, 20mA is set to -1000, when input is 12mA, the meter displays 0, input is
16mA, the meter displays -500. The max. display range is 9999, that is four digits, min. Display range is -1999.
SY LED4 Digit Display Meter has alarm function; it has 2-channel isolated switch quantity output to realize
timely display, controlling and alarm. The alarm function is realized by programming, and there are 2 pieces of
PC452 land pad is reserved for customer use when alarm function is required. The display meter has 2 alarm
points which can be set in up and down directions. The alarm target of the alarm point is the digit displayed,
when there is alarm, the last decimal of the LED Meter is flashing, alarm signal is output through terminal
which can drive the Optocoupler.

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