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E-mail
576082652@qq.com
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Phone
18521942435
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No. 70 Lishan Road, Lixia District, Jinan City
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Shanghai Automation Instrument Company Jinan Branch
Thermocouple temperature transmitter
NegotiableUpdate on 01/09
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Overview
A thermocouple temperature transmitter consists of circuit units such as a reference source, cold junction compensation, amplification unit, linearization processing, V/I conversion, decoupling processing, reverse connection protection, and current limiting protection. It amplifies the thermoelectric potential generated by the thermocouple through cold junction compensation, eliminates the nonlinear error between thermoelectric potential and temperature through a linear circuit, and finally amplifies and converts it into a 4-20mA current output signal.
Product Details
Temperature transmitter with thermocoupleIt consists of circuit units such as reference source, cold end compensation, amplification unit, linearization processing, V/I conversion, disconnection processing, reverse connection protection, and current limiting protection. It amplifies the thermoelectric potential generated by the thermocouple through cold junction compensation, eliminates the nonlinear error between thermoelectric potential and temperature through a linear circuit, and finally amplifies and converts it into a 4-20mA current output signal.
Working temperature: -50~240 ℃
Environmental temperature: -20~75 ℃
Effective detection range: 0-0.2-20m
Temperature transmitter with thermocoupleBasic Introduction
It consists of circuit units such as reference source, cold end compensation, amplification unit, linearization processing, V/I conversion, disconnection processing, reverse connection protection, and current limiting protection. It amplifies the thermoelectric potential generated by the thermocouple through cold junction compensation, eliminates the nonlinear error between thermoelectric potential and temperature through a linear circuit, and finally amplifies and converts it into a 4-20mA current output signal. To prevent accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the transmitter is also equipped with a power-off protection circuit. When the thermocouple breaks or is poorly connected, the transmitter will output the maximum value (28mA) to cut off the power supply of the instrument.
Principle of temperature transmitter
A temperature transmitter is an instrument that converts temperature variables into standardized output signals that can be transmitted. Mainly used for measuring and controlling temperature parameters in industrial processes.
A transmitter with sensors usually consists of two parts: the sensor and the signal converter. Sensors are mainly thermocouples or thermistors; Signal converters are mainly composed of measurement units, signal processing and conversion units (due to the standardization of industrial thermal resistance and thermocouple calibration tables, signal converters are also called transmitters when they are independent products). Some transmitters have added display units, and some also have fieldbus functions.
If a transmitter consists of two sensors used to measure temperature differences, there is a given continuous functional relationship between the output signal and the temperature difference. Therefore, it is called a temperature transmitter.
There is a given continuous function relationship (usually a linear function) between the output signal of the transmitter and the temperature variable. Early produced transmitters had a linear function relationship between the output signal and the resistance value (or voltage value) of the temperature sensor.
The standardized output signals are mainly DC electrical signals of 0mA~10mA and 4mA~20mA (or 1V~5V). Other standardized output signals with special regulations cannot be excluded.
Temperature transmitters can be divided into two-wire and four wire systems according to the power supply wiring method.
There are electric unit combination instrument series (DDZ-II, DDZ-III, and DDZ-S) and miniaturized modular, multi-functional intelligent transmitters. The former does not come with sensors, while the latter two types of transmitters can be easily combined with thermocouples or thermistors to form transmitters with sensors.
Technical data
Input signal:
Thermocouples: k, e, j, b, s, t, n. Thermistor: 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;
Output signal:
Output 4-20mA DC signal within the range of measurement, which is linear with the input signal of thermocouple or thermistor or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal and superimposes it to comply with the Hart standard protocol for communication; Isolated temperature transmitter: Input and output are isolated, with an isolation voltage of 500V, which increases the ability to resist common mode interference and is more suitable for networking with computers;
Basic error:
0.5%fs、0.2%fs、 Intelligent 0.2% fs;
Wiring method:
Two line system, three line system, four line system;
Display mode:
Four digit LCD displays the on-site temperature, and the intelligent four digit LCD can be used through a PC or handheld device
Set the device to display any of the following parameters: on-site temperature, sensor value, output current, and percentage;
Working voltage:
Ordinary model 12v-35v, intelligent model 12v-45v, rated working voltage is 24V
Allowable load resistance:
500 Ω (24VDC power supply); The maximum load resistance r (max) is 50vmin-12. For example, at a rated operating voltage of 24V, the load resistance can be selected and used within the range of 0-600 Ω.
Work environment:
a: Environmental temperature -25-+80 ℃ (conventional type)
-25-+70 ℃ (digital display type)
-25+75 ℃ (intelligent type)
b: Relative humidity: 5% -95%
c: Mechanical vibration f ≤ 50hz, amplitude ≤ 0.15mm
d: No corrosive gas or similar environment;
9. Environmental impact coefficient: δ ≤ 0.05%/℃.
Main Features
Simple structure: without any movable or elastic components, therefore high reliability and minimal maintenance.
Easy installation: The built-in structure particularly demonstrates this feature, without the need for any specialized tools.
Easy adjustment: The zero position and range potentiometers can be used to freely shift the zero position or change the range within the effective temperature detection range, and the two adjustments do not affect each other.
Widely applicable; Suitable for liquid level measurement in media with high temperature, high pressure, strong corrosion, etc.
Main technical indicators
Accuracy: Level 0.5, Level 1, Level 1.5
Pressure bearing range: negative pressure, normal pressure, high pressure (below 32MPa)
Applicable medium: acid, alkali, salt or any medium that is non corrosive to polytetrafluoroethylene
Output signal: 4-20mA, two-wire system
Power supply: Load resistance 0-750 Ω DC24V
Fixed method: Thread installation M20 × 1.5, M27 × 2 flange installation DN15, DN25, DN50, DN80.
Selection Information
Equipment maintenance
The abnormal phenomenon of instrument indication, such as high or low indication, no change or disorder, itself contains two factors: one is the process factor, the thermal resistance temperature transmitter instrument truly reflects the process abnormal situation; The second is the instrument factor, as a malfunction in a certain part of the instrument measurement system may result in false indications. The following inspection process is limited to instrument system failures only. When it is determined that the fault source is not a process problem, check and eliminate the instrument fault according to the fault diagnosis procedure.
If the instrument record curve is a dead line (a line with no change at all is called a dead line), or if the record curve was originally fluctuating and suddenly becomes a straight resistance temperature transmitter line; The malfunction is likely to be in the instrument system. Because most of the recording instruments are DCS computer systems, they have very high sensitivity and can react very sensitively to changes in parameters. At this point, you can manually change the process parameters and observe the changes in the curve. If there is no change, it is basically concluded that there is a problem with the instrument system; If there are normal changes, it can be concluded that there is no major problem with the instrument system of the base resistance temperature transmitter.
Working temperature: -50~240 ℃
Environmental temperature: -20~75 ℃
Effective detection range: 0-0.2-20m
Temperature transmitter with thermocoupleBasic Introduction
It consists of circuit units such as reference source, cold end compensation, amplification unit, linearization processing, V/I conversion, disconnection processing, reverse connection protection, and current limiting protection. It amplifies the thermoelectric potential generated by the thermocouple through cold junction compensation, eliminates the nonlinear error between thermoelectric potential and temperature through a linear circuit, and finally amplifies and converts it into a 4-20mA current output signal. To prevent accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the transmitter is also equipped with a power-off protection circuit. When the thermocouple breaks or is poorly connected, the transmitter will output the maximum value (28mA) to cut off the power supply of the instrument.
Principle of temperature transmitter
A temperature transmitter is an instrument that converts temperature variables into standardized output signals that can be transmitted. Mainly used for measuring and controlling temperature parameters in industrial processes.
A transmitter with sensors usually consists of two parts: the sensor and the signal converter. Sensors are mainly thermocouples or thermistors; Signal converters are mainly composed of measurement units, signal processing and conversion units (due to the standardization of industrial thermal resistance and thermocouple calibration tables, signal converters are also called transmitters when they are independent products). Some transmitters have added display units, and some also have fieldbus functions.
If a transmitter consists of two sensors used to measure temperature differences, there is a given continuous functional relationship between the output signal and the temperature difference. Therefore, it is called a temperature transmitter.
There is a given continuous function relationship (usually a linear function) between the output signal of the transmitter and the temperature variable. Early produced transmitters had a linear function relationship between the output signal and the resistance value (or voltage value) of the temperature sensor.
The standardized output signals are mainly DC electrical signals of 0mA~10mA and 4mA~20mA (or 1V~5V). Other standardized output signals with special regulations cannot be excluded.
Temperature transmitters can be divided into two-wire and four wire systems according to the power supply wiring method.
There are electric unit combination instrument series (DDZ-II, DDZ-III, and DDZ-S) and miniaturized modular, multi-functional intelligent transmitters. The former does not come with sensors, while the latter two types of transmitters can be easily combined with thermocouples or thermistors to form transmitters with sensors.
Technical data
Input signal:
Thermocouples: k, e, j, b, s, t, n. Thermistor: 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;
Output signal:
Output 4-20mA DC signal within the range of measurement, which is linear with the input signal of thermocouple or thermistor or linear with temperature. The intelligent temperature transmitter outputs a 4-20mA DC signal and superimposes it to comply with the Hart standard protocol for communication; Isolated temperature transmitter: Input and output are isolated, with an isolation voltage of 500V, which increases the ability to resist common mode interference and is more suitable for networking with computers;
Basic error:
0.5%fs、0.2%fs、 Intelligent 0.2% fs;
Wiring method:
Two line system, three line system, four line system;
Display mode:
Four digit LCD displays the on-site temperature, and the intelligent four digit LCD can be used through a PC or handheld device
Set the device to display any of the following parameters: on-site temperature, sensor value, output current, and percentage;
Working voltage:
Ordinary model 12v-35v, intelligent model 12v-45v, rated working voltage is 24V
Allowable load resistance:
500 Ω (24VDC power supply); The maximum load resistance r (max) is 50vmin-12. For example, at a rated operating voltage of 24V, the load resistance can be selected and used within the range of 0-600 Ω.
Work environment:
a: Environmental temperature -25-+80 ℃ (conventional type)
-25-+70 ℃ (digital display type)
-25+75 ℃ (intelligent type)
b: Relative humidity: 5% -95%
c: Mechanical vibration f ≤ 50hz, amplitude ≤ 0.15mm
d: No corrosive gas or similar environment;
9. Environmental impact coefficient: δ ≤ 0.05%/℃.
Main Features
Simple structure: without any movable or elastic components, therefore high reliability and minimal maintenance.
Easy installation: The built-in structure particularly demonstrates this feature, without the need for any specialized tools.
Easy adjustment: The zero position and range potentiometers can be used to freely shift the zero position or change the range within the effective temperature detection range, and the two adjustments do not affect each other.
Widely applicable; Suitable for liquid level measurement in media with high temperature, high pressure, strong corrosion, etc.
Main technical indicators
Accuracy: Level 0.5, Level 1, Level 1.5
Pressure bearing range: negative pressure, normal pressure, high pressure (below 32MPa)
Applicable medium: acid, alkali, salt or any medium that is non corrosive to polytetrafluoroethylene
Output signal: 4-20mA, two-wire system
Power supply: Load resistance 0-750 Ω DC24V
Fixed method: Thread installation M20 × 1.5, M27 × 2 flange installation DN15, DN25, DN50, DN80.
Selection Information
| Z | thermal resistor | ||||||||
| M | Nickel chromium silicon nickel chromium | ||||||||
| N | Nickel chromium nickel silicon | ||||||||
| E | Nickel chromium copper nickel | ||||||||
| F | Iron copper nickel | ||||||||
| C | Copper Copper Nickel | ||||||||
| P | platinum | ||||||||
| C | copper | ||||||||
| B | Temperature Transmitter | ||||||||
| 1 | No fixed device | ||||||||
| 2 | Fixed thread | ||||||||
| 3 | Activity flange | ||||||||
| 4 | Fixed flange | ||||||||
| 5 | Flexible tube connector type | ||||||||
| 6 | Fixed thread cone form | ||||||||
| 7 | Straight pipe joint type | ||||||||
| 8 | Fixed threaded pipe joint type | ||||||||
| 9 | Active threaded pipe joint type | ||||||||
| 2 | Anti spray type | ||||||||
| 3 | waterproof type | ||||||||
| 4 | Explosion proof type | ||||||||
| 0 | F16 | ||||||||
| 1 | F12 | ||||||||
| 2 | Ø 16 high alumina pipe | ||||||||
| 3 | Ø 20 high alumina pipe | ||||||||
| G | variable cross-section | ||||||||
| M | Simulated display | ||||||||
| S | digital display | ||||||||
| none | normal setup | ||||||||
| Z | Separate installation | ||||||||
| W | R | N | B | 2 | 4 | 0 | G | S | Z |
Equipment maintenance
The abnormal phenomenon of instrument indication, such as high or low indication, no change or disorder, itself contains two factors: one is the process factor, the thermal resistance temperature transmitter instrument truly reflects the process abnormal situation; The second is the instrument factor, as a malfunction in a certain part of the instrument measurement system may result in false indications. The following inspection process is limited to instrument system failures only. When it is determined that the fault source is not a process problem, check and eliminate the instrument fault according to the fault diagnosis procedure.
If the instrument record curve is a dead line (a line with no change at all is called a dead line), or if the record curve was originally fluctuating and suddenly becomes a straight resistance temperature transmitter line; The malfunction is likely to be in the instrument system. Because most of the recording instruments are DCS computer systems, they have very high sensitivity and can react very sensitively to changes in parameters. At this point, you can manually change the process parameters and observe the changes in the curve. If there is no change, it is basically concluded that there is a problem with the instrument system; If there are normal changes, it can be concluded that there is no major problem with the instrument system of the base resistance temperature transmitter.
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