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App ON/OFF Control 380V 5(60)A three phase smart wifi energy meter with din rail mounting

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Quick Details

Limits voltage range: 70%Un~120%Un
Normal voltage range: 90%Un~110%Un
Operating Temperature: 25℃ ~ +55℃
Usage: Active Electric Energy Measurement
Measuring Energy Range: 0-999999.9 kWh
Phase: Three Phase
Place of Origin: Zhejiang China
Constant: 800~1600 Imp/kWh
RS485 port: MODBUS-RTU protocol, 1200~9600bps,None parity ,default 9600bps
Dimensions: 126*98*78mm
Accuracy Class: 1.0
Model Number: DTS238-7
Brand Name: MEH
Rated current: 1.5(6)A, 5A/CT, 5(60)A ,10(80)A
Type: DIN Rail Mounting Energy Meter
Display Type: Digital Only
Frequency: 50HZ/60HZ
WIFI: 802.11b/g/n ,only support 2.4GHz network , not support 5GHz network
Output Voltage: 3x120/208V , 3x220/380V , 3x230/400V , 3x240/415V
Communication: wifi,RS485 Port MODBUS-RTU Protocol
Packaging Detail: 1pcs Each unit packed in a individual box, 20pcs/CTN
Selling Units: Multiple of 20
Package size per batch: 52X23X30.5 cm
Gross weight per batch: 13.0 KG
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Wenzhou Meiheng Electric Co., Ltd.
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US$ 10,000+
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Product Description



1.     General Description

       DTS238-7 WIFI type multi-function smart energy meter is designed to measure three phase four wire AC active energy and variable parameter. The meter have RS485 communication port and WIFI communication, it can use APP for remote reading and control on/off. All of its functions comply with the relative technical requirement for class 1 three phase watt hour meter in IEC62053-21 and its data communication rules obey the requirement of MODBUS-RTU and WIFI 802.11b/g/n.It is a long life meter with the advantage of high stability , high over load capability , low power loss and small volume.


The meter should be installed in suitable environment with ambient temperature range between -25℃~+55℃,the relative humidity less than 75% and temperature limits between    and-40℃~+70℃.


 The meter is manufactured complying with international standard IEC62052-11 on “Electricity metering equipment (AC) General requirements tests and test conditions” and IEC62053-21 on “Static meters for active energy (classes 1 and 2)”.


2.Specification and Technical Parameters


Meter type


Rate frequency

50 or 60 Hz

Rated current

1.5(6)A, 5A/CT, 5(60)A ,10(80)A

Rate voltage

3x120/208V , 3x220/380V , 3x230/400V , 3x240/415V

Normal voltage range


Limits voltage range


kWh Accuracy

Class 1

R.M.S accuracy

Class 0.5

Pulse constant

See meter

RS485 port

MODBUS-RTU protocol, 1200~9600bps,None parity ,default 9600bps


802.11b/g/n ,only support 2.4GHz network , not support 5GHz network


2.2 basic parameters:

Delayed power on/off time


overvoltage / undervoltage / overload  event judgment time


Overvoltage protection value

270V+1(default),APP can set value

Overvoltage recovery value

  260V+1(default)= (APP overvoltage value - 10V)

Undervoltage  protection value

170V+1(default),APP can set value

Undervoltage recovery value

    170V+1, (default)= (APP overvoltage value + 10V)

Overload protection value

65A(default),  APP can set value

Delay on/off control

00:01—24:00 Hour















Note: when it happens interrupt power-supply , the meter will not cut off , undervoltage event must last 3s , then it will cut off.


2.2 Technical Parameters

2.2.1 Basic tolerance

Load Current


Power factor


Basic error


Direct connection

CT connection












0.5(L) 0.8(C)




0.5(L) 0.8(C)




2.2.2 Self-consumption


Current circuit is less than 1.5VA / each phase

Voltage circuit is less than 2W/8VA each phase


2.2.3 Starting current


       Under the rated voltage , rated frequency and COSΦ=1 , the meter shall start and continue to register on application of 0.2% In (if CT is used) or 0.4% Ib .


2.2.4 Anti-creeping


       The meter has anti-creeping logical circuit. When 115%Un is connected to the meter and current circuit is cut , the meter shall not create more than one pulse in a stipulated time


2.2.5 Average-life


       The meter can be used for at least 10 years in normal operation specified in this manual

2.2.6 LCD: 6+2 (999999.99kWh) 


3.Basic Features

  • 3.1 Measuring positive & negative active energy with negative energy accumulated into positive energy,.
  • 3.2 The meter also display three phase real voltage , real current , real active power , real power factor , real frequency
  • 3.3 Pulse LED indicates working of meter,Pulse output with optical coupling isolation                    
  • 3.4 RS485 communication port and WIFI communication
  • 3.5 Measuring active energy without calibration under long term operation
  • 3.6 display step by step with button
  • 3.7 it can use APP software for data reading and remoter control on/off.
  • 3.8 it has overvoltage and undervoltage protection , it can set value from APP
  • 3.9 it has overload protection ,it can set value from APP
  • 3.10 it has timing control function , it can set value from APP
  • 3.11 it can reset the active energy to zero from APP


4.Working principles

       Three phase voltage and current are sampled from respective sampling circuit and transformed into suitable signal, which is carried into integrated circuit , then the meter output pulse signal in positive appropriation to measured power to drive step-motor counter or LCD counter to realize energy measurement. The meter has energy pulse output for testing with pulse width of 80+20ms





5. Structure

          The meter consists of meter base , meter cover , terminal base , terminal cover . there are lead seal on meter cover  and terminal cover . A special screw is used to fix the terminal cover on which a lead seal can be installed

6. Usage

6.1 schematic diagram







6.1 Connection diagram




Noting: for CT input type connection , the power consumed display in register is not fact power consumed. The fact power= the power display in register of meter X CT rate. For example , the power display in the register is 0.5 kWh and the CT is 800/5A , the fact power consumed=0.5 kWh X 160=80kWh


6.2 Installation

  • The meter can be installed on a 35 mm DIN rail
  • 6.2.1 The meter can not installed and used until it is checked goods and sealed before delivery
  • 6.2.2 The meter should be install in the water proof box indoor or outdoor . the meter’s box should be fixed on strong and flame-resistant wall with a recommended height of about 1.8 m , where there is no corrosive gas around .
  • 6.2.3 The meter should be install fully in accordance with connection diagram on the terminal cover, it is better to use copper as the leading wire for connection. All screws should be tightened. 
  • 6.2.4 Diagram for installation dimension




7. Transportation and Storage

  • 7.1 Heavy impact should be burdened to the products while transportation and unpacking.
  • 7.2 The products should be stored in the original package and kept in place with temperature between -40℃~+70℃,the relative humidity less than 75% and no corrosive gas around .
  • 7.3 In storehouse , the meter should be placed on the shelf when kept in stock , there should not be more than 7 cartons piled up in vertical. Single-packed meters can not be piled up with more than 5 meters in vertical.


8. Warranty period

   Within 12 months from the day of selling and provided that users operate correctly according to the requirement of the user’s manual , if the meter doesn’t reach its technical specification. It can be repaired or replaced in free f charge by the manufacturer.


9. Frame format

9.1   Read command(function code 03)

Send frame

Meter ID

Function code

Register address

Data number

Check code (CRC)







Receive frame

Meter ID

Function code

Data length n

Data area

Check code (CRC)




n byte




10. How to connect wifi for setting up:

1). Please scan the two-bar-codes to download the “WISEN” software

2). Meter input power:
When the meter power on , you can push the setting button last 5s , meter enter into the status of waiting for WIFI distribution network and  the WIFI led will flash 1s interval .

its means meter enter into the status of waiting for WIFI distribution network . if WIFI led light on 5s , light off 0.1s ,it means meter connect the WIFI successfully.

3). Add device:

 Please check firstly that your telephone have connected the available WIFI network , then click the “add device “ button .now the meter  only used under 2.4GHz WIFI network , it can not use under 5GHz WIFI network .



APP Menu instruction

The meter will display online or offline after you add the device successfully .

You can click the device to check the meter detailed information

You will see the active energy data and remote control button and timing setting button in the menu.



Control button : used for control on / off of meter output

Reset button: used for reset the total active energy to zero

Timing button: used for timing control on/off and time delay control on/off

1.   time control :you can add the time which is control and which is control off ,if you do not select week , it will save as single time control . if you select the week, it will save as cycle control .

time-delay control : you can set 1minute to 24hour max to time delay control. For example ,you can use delay time control to control off the Battery car charging after 2hours.



the meter do not have time clock internal ,the time control is decide to cloud serve, so make sure the meter connect the available WIFI network.


3.Setting button : for protection value and unit price ,starting active energy value setting.






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