Thank you very much for purchasing and using the 3402 two-wire integrated vibration speed transmitter. This user's manual describes the necessary items for proper use of the 3402. Please read this manual carefully before designing and maintaining the device.
This manual is applicable to the operation and use of 3402 two-wire integrated vibration speed transmitter (hereinafter referred to as 3402 transmitter);
This manual describes the requirements, parameters, structure, technical parameters, installation, outlet, and environment of the 3402 integrated two-wire vibration speed transmitter.
In the course of use, if there is something unknown, please call us.
Chapter 1 Overview
1,1 Introduction
The 3402 two-wire integrated vibration speed transmitter is designed and manufactured based on the use under harsh environmental conditions. Please select the product according to the site conditions.
The 3402 two-wire integrated vibration speed transmitter is based on our NE3402S (three-wire) vibration transmitter and uses many of our new patented technologies; it will convert the loop power, piezoelectric sensors, and low-power precision The measurement circuits are integrated together and the two-wire integrated vibration transmitter with international advanced level is introduced.
1, 2 working principle
3402 Transmitter (hereinafter referred to as Transmitter) has built-in MEMS piezo-electric element to sense vibration speed, and converts acceleration to peak speed/effective value through high-precision integrated circuit; then converts speed peak/effective value to corresponding range of 4 to 20mA. Current output for easy remote display and control; ideal for connecting to DCS, PLC and data acquisition systems.
1, 3 Performance characteristics 1 two-wire loop, the use of the transmitter to maintain more convenient and more economical;
2 original fault-tolerant technology, the two loops of the polarity of any arbitrary connection;
3 patented low-power, high-stability measuring circuit, fully integrated process, ensuring a linear high-accuracy 4~20mA current output corresponding to vibration speed;
4MEMS piezoelectric core, integrated structure, durable;
5 kinds of installation, connection type, a variety of vibration range, to meet the requirements of various occasions.
Chapter 2 & 3402 transmitter composition and function
2, 1 & 3402 transmitter shape (see Figure 2-1)
Figure 2-1-A protective box outlet type
2〠2  3402 Transmitter Function
The 3402 transmitter is installed on the surface of the machine and directly senses the vibration of the machine's housing, converting its vibration into a corresponding amount of current output of 4 to 20 mA; accuracy: 2% of full scale; maximum load resistance of 500 ohms.
Chapter 3 Transmitter Specifications and Specifications
3〠1 3402 Transmitter Technical Specifications Power Source: +24±15%Vdc power supply, maximum power consumption 0.5W;
Measuring range: 0～40mm/s rms; (any optional range)
Frequency range: 10 ~ 1000Hz; -3db;
Sensitive direction: axial, arbitrary direction / angle installation;
Transverse sensitivity: ≤ 3%;
Electrical isolation: 500Vrms, circuit and housing isolation;
Current output: standard 4 ~ 20mA output;
(Proportional to the effective value of measuring vibration speed) Accuracy: ±2%; (Maximum load: 500Ω)
Impact limit: 1000g;
Quality: 0.2Kg;
Protection class: IP67
Use environment: -30 ~ 70 °C;
Relative humidity: no more than 95%, no condensation.
3, 2  3402 Transmitter Model Specifications
 A  B  C  D  E
 3402E - - - -
Chapter 4 Installation
4. 1 Transmitter Installation The appearance and installation method of the transmitter is shown in the following figure (4-1).
Open an M8*1.25 tapped hole (or custom thread) on the outer shell of the machine and rotate the transmitter clockwise into the corresponding tapped hole; until the thread is fully tightened (the transmitter is fully integrated with the machine housing) .
â—† Install the transmitter X (horizontal) and Y (vertical) as far as possible according to the site installation conditions;
â—† Seal all outlet holes to ensure that there is no moisture condensation and water vapor intrusion into the transmitter;
◆ The ambient temperature of the installation location should be -30 ~ 70 °C;
Figure 4-1 Installation of the protective box
a) The transmitter electrical connection 1 must use the special cable that our company configures;
2 wiring specifications should meet the site requirements, such as corrosion resistance, high temperature and so on;
3 In order to ensure the maximum isolated electrical noise of the transmitter; to avoid interference with large signal cables and transmitter cables and to run the line;
4 Sealed cable lead-in holes to prevent moisture in the transmitter;
5 Transmitter wiring; when the transmitter is out, all the cables and outlet terminals are marked one by one, and the terminals with the same identification code are connected with the cable;
Two-wire European terminal outlets are defined as follows:
Pin ID Line Header Header Name
1 white line +24V power line
2 Black Line -24V Power Line
6 wiring instructions:
7 It is forbidden to install the wiring with live power, and the wire head can't be loosened firmly;
Chapter 5 Use and Maintenance
5,1 use
1) Before using the 3402 transmitter, check that the wiring is intact;
 2) Verify that the transmitter power supply should be +24V ± 15% VDC;
3) When the transmitter is powered on, the output current should be around 4.00 mn at no vibration;
& nbsp4) The measured machine vibration, the transmitter output should correspond to the linear 4 ~ 20mA current output;
5, 2 maintenance
& nbsp1) During the inspection, before the transmitter opens the protective cover, the power must be cut off to ensure the safety of the equipment.
It is strictly forbidden to open and cover inspection work! ! !
& nbsp2) Check whether the connection between the terminal and the terminal is tight, and then close the protective cover after completely tightening.
5,3 Causes and Causes of Malfunctions Symptom Cause Analysis Processing Method Detected Incorrectly Received Data The detected signal is out of range of the product. Check whether the product range is consistent with the actual situation. Sometimes there is no output, and the large jumper is connected and tightened. Whether the wiring head meets the wiring requirements, re-fasten the wiring head and connection
5,4 Other matters
1) Factory random list: 3402 transmitter 1 (complete accessories for cable and locking device)
"Product Specification" 1
When the user can not solve the problem of the transmitter, you can contact our company, we will serve you for the first time.
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