Integrated temperature transmitter

Temperature gauge>>SBWR/ZIntegrated temperature transmitter:

1、 Instrument Overview:
Integrated temperature transmitterIt is an on-site installed temperature transmitter unit that is used in conjunction with industrial thermocouples and thermal resistors. It adopts a two-wire transmission method (two wires serve as a common transmission line for power input and signal output). Convert industrial thermocouple and thermistor signals into 4-20mA and 0-10mA output signals that are linear with the input signal or temperature signal. Temperature transmitter is an updated product for temperature measurement and control in modern industrial sites and research institutes. It is a product of distributed systems and digital bus systems.
2、 Measurement principle:
Integrated temperature transmitterThe thermocouple or thermistor sensor will convert the measured temperature into an electrical signal, and then send the signal to the input network of the transmitter, which includes relevant circuits such as zero adjustment and thermocouple compensation. The zero adjusted signal is input to an operational amplifier for signal amplification. The amplified signal is then processed by a V/I converter and output as a 4-20mA DC current; The other path is processed by an A/D converter and displayed in the header. There are two types of linearization circuits for transmitters, both of which use feedback methods. For thermistor sensors, calibrate using positive feedback method, and for thermocouple sensors, calibrate using multi segment line approximation method.
3、 Applicable occasions:
The temperature transmitter can be directly installed in the junction box of thermocouples and thermal resistors to form an integrated structure. As a new generation of temperature measuring instrument, it can be widely used in industrial sectors such as metallurgy, petroleum, chemical, power, light industry, textile, food, national defense, and scientific research.
4、 Performance characteristics:
Ultra small (module diameter 44 × 18) integrated, with strong versatility.
Two line system with 4-20mA DC output. Long transmission distance and strong resistance.
Cold end, temperature drift, non-linear automatic compensation.
High measurement accuracy and good stability.
The temperature module adopts epoxy resin casting technology internally, which is suitable for use in various harsh and dangerous places.
Integrated design, simple and reasonable structure, can directly replace ordinary assembled thermocouples and thermistors.
Mechanical protection IP65.
Using thermocouple temperature change can eliminate the need for compensating wires and reduce costs
Various indication functions such as LCD, digital display, pointer, etc. facilitate timely monitoring on site.
When the on-site ambient temperature is above 70 ℃, the transmitter and on-site display instrument can be installed separately (isolated)
Explosion proof rating: dIIBT4, dIIBT5.
Protection level: IP54.
5、 Technical indicators:
1. Input signal: Thermocouples: K, E, J, B, S, T, N. Thermistors: Pt100, Cu50, Cu100 (three wire system, four wire system). The input signal of the intelligent temperature transmitter can be set arbitrarily through a handheld device and a PC;
2. Output signal: Output a 4-20mA DC signal within the range of measurement, which is linear with the input signal of the thermocouple or thermistor or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal and superimposes it with communication in accordance with the HART standard protocol; Intelligent flow integrator isolated temperature transmitter: Input and output are isolated, with an isolation voltage of 500V, which increases the resistance to common mode * force and is more suitable for use in computer networking;
3. Basic error: 0.5% FS, 0.2% FS, intelligent 0.2% FS;
4. Wiring methods: two-wire system, three wire system, four wire system;
5. Display mode: Four digit LCD displays the on-site temperature, and the intelligent four digit LCD can be set through a PC or handheld device to display any of the parameters such as on-site temperature, sensor value, output current, and percentage;
6. Working voltage: Ordinary model 12V-35V, intelligent model 12V-45V, rated working voltage is 24V;
7. Allowable load resistance: 500 Ω (24VDC power supply); The maximum load resistance R (max) is 50 (Vmin-12). For example, at a rated operating voltage of 24V, the load resistance of the intelligent flow integrator can be selected and used within the range of 0-600 Ω.
6、 Work environment:
1. Environmental temperature -25-+80 ℃ (conventional type);
2. Relative humidity: 5% -95%;
3. Mechanical vibration f ≤ 50Hz, amplitude ≤ 0.15mm;
4. No corrosive gas or similar environment;
5. Environmental impact coefficient: δ ≤ 0.05%/℃.
7、 Wiring and adjustment:
The wiring principle of the transmitter is shown in the diagram. Terminal 4 is connected to the positive terminal of the 24V power supply, and terminal 3 is the 4-20mA current output terminal, which returns to the negative terminal of the 24V power supply after passing through the load resistor R1.
Connect terminals 1 and 2 to a thermistor, or connect 2 to a positive thermocouple and 1 to a negative thermocouple. The transmitter has zero and range adjustment potentiometers, making it easy for users to make small adjustments.

8、 Verification method:
1. Equipment requirements: one digital voltmeter;
2. Connect the wires according to the system connection method;
3. According to the sensor and range indicated on the transmitter nameplate, input the corresponding resistance values to output 1V and 5V (the zero potentiometer and full potentiometer can be adjusted separately);
4. Input the resistance values at the ten equal points of the measurement range and check if the temperature outputs meet the accuracy range;
5. Tested according to the technical specifications in the manual, it should meet the technical requirements.

9、 Attention:

1. When used in explosive hazardous areas, please pay attention to explosion-proof signs and protection levels;
2. The installation environment must be within -20-+70 ℃. When the ambient temperature is too high, the SBWZ/R signal converter and display module can be installed separately from the thermistor or thermocouple. Our factory is equipped with explosion-proof boxes for separate installation of transmitters.
3. Before powering on, please carefully check the positive and negative polarity of the power supply. Do not connect it incorrectly, otherwise it may cause unknown consequences.
4. The signal converter module is sealed and cured with epoxy resin to enhance its shock resistance and prevent moisture, corrosion, and dampness.
5. The temperature transmitter needs to be calibrated after six months of use.

10、 Measurement range:

11、 Selection List:

12、 Design and ordering instructions:
1. Special specification orders are determined through mutual consultation between both parties.
2. Protective tubes made of corresponding materials can be provided according to user needs. Such as corundum tube or high alumina protective tube.
3. If there are any other special requirements, please indicate them when placing an order.
After-sales service
1. The instrument series products sold by Zhongwei ensure the sale of products and spare parts at the same price within two years, and provide corresponding free of charge according to the requirements of the demand.
2. If there are any quality problems with the products provided by our company within one year (excluding vulnerable parts or accessories), we will be responsible for free repairs and provide free skill training for the employees of the demand side.
3. Due to quality issues with the products provided by our company, after verification by our technical department, we will dispatch professional technicians to the site to handle the problem until customer satisfaction is achieved.
4. Outside the warranty period, the product will be returned to the company for repair or sent to the user for repair.
5. Join hands with Zhongwei Measurement and Control to create a better future! Welcome to your visit!