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DC-DC 0.36" Digital Voltmeter 20V Limit Alarm 2/3 Wires Universal Voltage Tester

Description:

Features:

New high-precision digital voltmeter, with upper and lower limit voltage alarm output function. Can be used as overvoltage, undervoltage alarm output. If connect with relay it also can be used as overvoltage or undervoltage protection.
3-wires, and you can change it to 2-wires.
Input with anti-reverse protection
When the measured voltage below 10V, automatic transfer decimal point, increase the resolution of low voltage.

Featrures:

Supply Voltage :4-30V
Measuring range :0-20V
Upper and lower limit setting range :0-19.9 V (0.1V onwards)
Upper and lower limit output level mode: In the setting range is high level, exceeding the set value is low level.
Minimum resolution: 0.02V
Refresh rate: 300mS / times
Display color: Red
Operating temperature: -40°C to +85 °C
Input reverse polarity protection: yes
Wiring: wire-type (Default is 3-wire. If you need to change to 2-wire, please R1 shorted connection{look at the pictures}).
Note: when work in 2-wire mode, the measurement range and power supply range is the same, so do not exceed 30V measurements. Measuring the voltage exceeds 30V, use 3-wire.
Install method: 2 pieces 2mm screws
Size: 29*23*10 mm (L*W*H)

Wiring instructions:

When work as a two-wire meter application, please R1 short connection, connect GND and input then can display the input voltage. (Two-wire measurement range do not exceed 30V)
When work as a three-wire meter, R1 disconnect, "+4-30V" port connect 4-30V supply for the digital meter, “IN+”port connect the voltage to be measured. There are two GND port, it is the same, according to the actual you can connect one or both.
There is a calibration potentiometer on board, you can calibrate the display value.
5PINfor the expansion of output. K1, K2 is external lead for the key switch on-board, if do not use these two key switch on board, you can use external buttons through these two PIN, the same function. LV is the lower limit alarm output, below the set value it is low level output. HV is the upper limit alarm output, higher than the upper limit set value it is low level output. LV, HV is the control signal output, if use for driving lights, relay or the other loads please add driver circuit.
Upper and lower limit setting method: press two keys simultaneously, the red indicator(HV) light, press + or - key to set the desired limit alarm voltage value. And then simultaneously press two keys again, yellow indicator(LV) light, press + or - key to set the desired lower limit alarm voltage value. Then press both keys simultaneously to exit setting.

Reference Application Circuit:

Overvoltage and undervoltage signal independent application, control two relays separately. When power on, relay connect. When out of the upper and lower limit set value, relay disconnect. Relays can be replaced with the other loads. If you need reverse control, please add a reverse transistor.
- Overvoltage and undervoltage signal composite application. When power on, relay connect. As long as the measured voltage in the upper and lower limits setting value range, relay on. When the measured voltage exceeds the upper and lower limit set value, relay disconnect. Relays can be replaced with the other loads. If you need reverse control, please add a reverse transistor.
Package Contents
100% Brand New

1 x 0.36" 0-20V Digital Voltmeter

We can also wholesale if you need a large quantity of item please contact us :)

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