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An overview,
Flameproof integrated temperature transmitter (hereinafter referred to as the temperature transmitter) is composed of temperature sensor and signal converter, signal converter installation within the cold end temperature sensor junction box, the temperature sensor detects the voltage, resistance signal directly into 4 ~ 20 ma output current.Simple structure, convenient installation, use and maintenance, is the new generation temperature detecting and control instrument, was welcomed by the majority of designers and users.Has been widely used in petroleum, chemical, metallurgical, power, light industry and other departments, and the regulator, recording instrument, computer, etc, of all kinds of measurement and control systems.
The temperature transmitter according to the temperature sensor is different, divided into two series thermocouple and thermal resistance, in each series, according to the use of different divided into flameproof and ordinary, depending on the output function, divided into a live show and not a live show.The user can choose according to the requirement of the using occasion and matching instrument appropriate specifications.
Flameproof temperature transmitter by the national instruments explosion-proof safety supervision and inspection to test qualified, can be used in explosive gas environment.
Second, the main characteristics
1. The two wire transfer.Two signal converter power supply wire and the output signal.
2. The constant current output signal (4 ~ 20 ma).Strong anti-jamming capability, remote transmission performance is good.
3. The signal converter with epoxy resin encapsulation into modules, has the advantages of shock resistance, corrosion resistance, moisture proof, can be used in conditions of poor areas.
4. The thermocouple millivolt signal through the signal converter directly into 4 ~ 20 ma current output, using ordinary cable transmission signal, can save expensive compensation conductor.
5. Take the scene shows the temperature of the transmitter output both 4 ~ 20 ma current signal, and can read the measured temperature at the scene of the temperature measurement, was a great convenience to the operating personnel.
Three, main technical index
Power supply voltage: 13 ~ 30 v DC
Ω load resistance: 0 ~ 850
The output signal: 4 ~ 20 ma
Basic error: plus or minus 0.2%, plus or minus 0.5%
Display way: a liquid crystal display
Using the environment temperature: - 20 ~ 70 ℃
Environment temperature effect: 0.25% / 10 ℃
The cold end compensating error: 0.5% / 10 ℃
Explosion-proof marks: d Ⅱ BT4
Protection grade: IP54
Four, models and specifications
Five, the system connection
Generally choose 24 v supply voltage Vs, load resistance RL chooses 250 Ω, such as by 4 ~ 20 ma current circuit, the voltage drop on the RL is 1 ~ 5 v.If the Vs and choose other numerical RL, RL value cannot be more than the value calculated by formula RL =.
Six, overall dimensions and installation
1. Normal integrated temperature transmitter (thermocouple, heat resistance),
2. The flameproof integrated temperature transmitter (thermocouple, heat resistance),
Seven, explosion-proof features
1. The explosion-proof marks: dIIBT4
Use a room 2.
Can be used to contain environment of explosive gas mixture, and its level is not higher than class II class B (including class II grade A class II grade B), and spontaneous combustion temperature is not lower than the T4 (T1, T2, T3, T4) in the workplace.
