Integrated temperature transmitter

1 basic information editing

Features

Ultra-compact (module φ44×18) integration, strong universality

Two-wire 4-20mA DC output. Long distance transmission, strong anti-interference ability.

Cold end, temperature drift, non-linear automatic compensation.

High measurement accuracy and long-term stability.

The interior of the temperature module adopts the epoxy resin casting process, which is suitable for use in various harsh and dangerous places.

Integrated design, simple and reasonable structure, can directly replace the ordinary assembly type thermocouple, thermal resistance.

Mechanical protection IP65.

Thermocouple temperature change eliminates the need for compensation leads and reduces costs

LCD, digital tube, hands and other indicators to facilitate timely monitoring of the scene.

When the ambient temperature in the field is >70 °C, the transmitter and the on-site display instrument can be separated (isolated). If the conditions do not allow the length of the protective tube to be extended to protect the temperature transmitter.

Explosion-proof grade: dIIBT4, dIIBT5. CT4.CT6

Protection class: IP54, IP65

It can be integrated with a thermocouple or a thermal resistor to form an on-site installation structure, or it can be used as a functional module installed in a detection device and on a dashboard.

Technical indicators

Category SBW modular temperature change SBW integrated temperature change

Accuracy 0.2%FS 0.5%FS

Input Thermocouples: B, S, T, K, J

Thermal resistance: Pt100, Pt10, Cu100, Cu50

Output 2-wire 4-20mA DC or 3-wire 4-20mA DC

Operating temperature -25-85 °C (0-60 °C for integrated LCD meter)

Temperature effect ≤0.05%/ °C

Humidity 5-95%RH

Live display without 3 1/2LED 3 1/2LCD 0-100% bisect scale

Display accuracy without digital: 0.5-pointer: 2.0

Load capacity < 600 Ω (rated load 250 Ω)

Dimensions 44×18 70 ×100 (repeater)

skills requirement

1) The integrated temperature transmitter can communicate with the host computer via the HART modem, or perform remote information management, configuration, variable monitoring, calibration, and maintenance functions on the model, index number, and range of the transmitter with the handheld and PC. ;

2) The integrated temperature transmitter can adjust the display direction of the transmitter according to the actual needs of the user, and display the measured medium temperature, sensor value change, output current and percentage of the transmitter;

3) The integrated temperature transmitter adopts silicone rubber or epoxy resin sealing structure, so it is shock-resistant, moisture-resistant and suitable for installation in harsh environments.

4) It is installed in the junction box of thermocouples and thermal resistors on site and outputs 4-20mA and 0-10mA output signals directly. This not only saves the cost of the expensive compensation wire, but also improves the anti-interference ability of the signal during long-distance transmission.

5) Thermocouple transmitter has automatic cold junction temperature compensation;

6) High precision, low power consumption, wide operating temperature range, stable and reliable operation;

7) Wide range of applications, which can be integrated with thermocouples, thermal resistors to form an integrated field installation structure, and can also be used as functional modules installed in testing equipment and on dashboards;

Principle work

The working principle of hydrostatic pressure measurement works. The transmitter operates using the principle of hydrostatic pressure measurement. It generally selects the silicon pressure measuring transducer to convert the measured pressure into electrical signals, and then compensates by the amplification circuit and the compensation circuit, and then compensates by the amplification circuit and the compensation circuit. Finally, the 4-20 mA DC electrical signal is output.

The integrated temperature transmitter can have an actual vacuum but is adjusted at the circuit processing stage to obtain absolute pressure. The gauge pressure transmitter is measured relative to atmospheric pressure and is equivalent to P2 reference atmospheric pressure reference atmospheric pressure P0. Relative to the atmospheric pressure measurement, it is equivalent to the reference atmospheric pressure. This is the case for most pressure measurements in the field, such as main steam pressure measurements. This is the case for measurements, such as main steam pressure measurements. Differential Pressure Measurement Transmitter Differential pressure measurement transmitter is mainly divided into liquid level measurement and flow measurement. Differential pressure transmitters are mainly classified into liquid level measurement and flow measurement.

The extended temperature transmitter understands that the liquid level sensor is based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid, and based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid, the foreign advanced isolation type is adopted. Diffused silicon sensitive element or ceramic capacitive pressure sensitive sensor converts static pressure into electrical signal, silicon-dissipation sensitive element or ceramic capacitive pressure-sensitive sensor converts static pressure into electrical signal, and then undergoes temperature compensation and linear correction to convert into standard electricity signal.

The integrated temperature transmitter converts this tiny capacitance change into a standard current (or voltage) output through a balancing circuit, so that a current (or voltage) signal that is linearly related to the pressure change is obtained. The output is thus a current (or voltage) signal that is linearly related to the pressure change. The working principle of inductive transformer is similar.

working principle

Explosion-proof thermocouples use the explosion-proof flameproof principle. When an explosion occurs in the cavity, the flame can be extinguished and cooled through the joint gap, so that the full temperature of the flame after explosion can not be transmitted outside the cavity.

The thermoelectric potential (resistance) generated by the thermocouple (thermal resistance) generates an unbalanced signal through the bridge of the temperature transmitter, and after being amplified, it is converted into a 4-20 mA DC signal to the working instrument, and the working instrument displays the corresponding temperature value. .

Temperature range

1) Thermal resistance temperature measurement range and tolerance

model

Index number

Temperature range

Accuracy level

Allowable deviation

WZPB

Pt100

-200°C~+500°C

Class A

Class B

±(0.15+0.002t)

±(0.30+0.005t)

WZCB

Cu50 Cu100

-50°C~+100°C

---

±(0.30+0.006t)

2) Temperature range and tolerance of thermocouples

model

Index number

Tolerance level

I

II

Tolerance

Temperature range

Tolerance

Temperature range

WRNB

K

±1.5°C

-40°C~+375°C

±2.5°C

-40°C~+333°C

±0.004t

375°C~1000°C

±0.0075t

333°C~1200°C

WRMB

N

±1.5°C

-40°C~+375°C

±2.5°C

-40°C~+333°C

±0.004t

375°C~1000°C

±0.0075t

333°C~1200°C

WREB

E

±1.5°C

-40°C~+375°C

±2.5°C

-40°C~+333°C

±0.004t

375°C~1000°C

±0.004t

333°C~900°C

WRFB

J

±1.5°C

-40°C~+375°C

±2.5°C

-40°C~+333°C

±0.004t

375°C~1000°C

±0.004t

333°C~750°C

WRCB

T

±0.5°C

-40°C~+125°C

±1.5°C

-40°C~+333°C

±0.004t

125°C~350°C

±0.0075t

333°C~350°C

Characteristic analysis

Analog Features

● High precision

● Range, zero external continuous adjustable

● Good stability

● Up to 500% positive migration and up to 600% negative migration

● Two-wire system

● Adjustable damping, over pressure resistance

● Solid sensor design

● No mechanical moving parts, less maintenance

● Light weight (2.4kg)

● All series of unified structure, strong interchangeability

● Miniaturization (166mm total height)

● Optional diaphragm material for contact with media

● Unilateral overpressure

● Low pressure cast aluminum alloy housing

Smart features:

●Super measurement performance for pressure, differential pressure, level, flow measurement

●Digital accuracy: +(-)0.05%

● Analog Accuracy: +(-)0.75%+(-)0.1%FS

● Full performance: +(-)0.25FS

● Stability: 0.25% 60 months

● Turndown ratio: 100:1

● Measurement rate: 0.2S

● Miniaturized (2.4kg) stainless Steel Flange for easy installation

● The process connection is compatible with other products to achieve the best measurement

● The only sensor (patented technology) using H alloy sheath in the world achieves excellent cold and thermal stability

● Intelligent transmitter with 16-bit computer

Standard 4-20mA with digital signal based on HART protocol, remote control

● Support upgrades to fieldbus and field-based control technology.

Performance

category

SBW modular temperature change

SBW integrated temperature change

Accuracy

0.2%FS 0.5%FS

enter

Thermocouples: B, S, T, K, J

Thermal resistance: Pt100, Pt10, Cu100, Cu50

Output

Two-wire 4-20mA DC

Operating temperature

-25-85 °C (0-60 °C with integrated LCD meter)

Temperature effect

≤0.05%/ °C

humidity

5-95%RH

Live display

no

3 1/2LED 3 1/2LCD 0-100% Aliquots

Display accuracy

no

Digital: 0.5-pointer: 2.0

load capacity

< 600 Ω (rated load 250 Ω)

Dimensions

44×18

70 × 100 (repeater)

2 Maintenance Edit

Because of the compact size of the integrated temperature transmitter, it has many uses. My own maintenance experience is this:

The use of integrated temperature transmitter Note:

1. Wiring: The wiring of the safety sparking circuit (input signal line) must be insulated wire or shielded wire, and the wiring of the non-safety sparking circuit should be isolated from each other so as not to mix with each other.

2, different types of temperature transmitter according to the manual wiring, explosion-proof instrument with a safety spark circuit wiring must not be wrong, and carefully check whether there is a short or wrong.

3. When using a temperature transmitter, pay special attention to the distinction between the ordinary type and the intrinsically safe type. The ordinary type cannot be installed in a dangerous area. The intrinsically safe type can be installed in a dangerous area.

4. The line resistance of the three wires of the RTD transmitter should be equal and within the same ambient temperature.

Integrated temperature transmitter maintenance knowledge:

1. For explosion-proof devices, in principle, it is not allowed to disassemble the components of the safety spark circuit and exchange the wiring of the instrument. If replacement is required, the explosion-proof device shall be used.

2. When checking regularly, in order to accurately read the data, connect a digital voltmeter between the output terminals to measure, and do not remove the safety spark circuit.

3, after the failure of the instrument, should be checked for power failure, no fault can not be sent.

4. The temperature transmitter should be kept clean during operation.

3 selection method editing

model

category

Temperature sensor

material

Live display

Fixed installation

the way

wiring

Box form

protection

Tube diameter

Flameproof sign

Inner core structure

Protection tube features

Instructions

SBW

Temperature Transmitter

R

Thermocouple

Z

Thermal resistance

M

Nickel-Chromium-Silicon-Nickel{N}

N

Nickel-chromium-nickel silicon {K }

E

Nickel-chromium-copper nickel{E}

F

Iron-copper nickel{J }

C

Copper-copper nickel {T }

P

Platinum {Pt100}

C

Copper {Cu50}

Y

Live LCD display

1

No fixture

2

Fixed thread

3

Movable flange

4

Fixed flange

5

Active connection type

6

Fixed thread taper

7

Straight pipe joint type

8

Fixed thread fittings

9

Active thread coupling

2

Blowout type

3

Waterproof

4

Explosion-proof

0

Ф16

1

Ф12

2

Ф16 high aluminum tube

3

Ф20 high aluminum tube

B

Flameproof

no

General components

K

Armored components

F

Anti-corrosion type

N

Wear type

SBW

Z

P

no

2

3

0

no

K

no

Typical model selection

4 Installation Notes Edit

During installation, the integrated temperature transmitter has poor insulation and the introduced error is insulated by thermocouples. Excessive dirt and salt residue on the protection tube and the wire drawing board cause poor insulation between the thermocouple and the wall of the furnace. To be serious, this will not only cause the loss of thermoelectric potential but also introduce interference. The resulting errors can sometimes reach Baidu.

Integral temperature transmitter error introduced by thermal inertia

Because the thermo-inertia of the thermocouple causes the indication value of the instrument to lag behind the change of the measured temperature, this effect is particularly prominent when rapid measurement is performed. Therefore, thermocouples with smaller thermo-electrodes and smaller diameter of the protection tube should be used as much as possible.

Even when the temperature measurement environment permits, the protective tube can even be removed.

Due to the measurement hysteresis, the amplitude of the temperature fluctuation detected by the thermocouple is smaller than the amplitude of the fluctuation of the furnace temperature.

In order to accurately measure the temperature, a thermocouple with a small time constant should be selected. The time constant is inversely proportional to the heat transfer coefficient and is proportional to the diameter of the hot end of the thermocouple, the density of the material, and the specific heat. To reduce the time constant, in addition to increasing the In addition to the thermal coefficient, the most effective way is to minimize the size of the hot end.

In the use of an integrated temperature transmitter, usually a material with good thermal conductivity is used, and the protective tube with a thin wall and small internal diameter is used. In a more precise temperature measurement, a bare wire thermocouple without a protective sleeve should be used in time. Correction and replacement.

5 Advantage editing

1. Simple structure, 2. Save lead wire, 3. Large output signal, 4. Strong anti-interference ability, good linearity, 5. Simple display instrument, 6. Solid module anti-seismic and moisture-proof, 7. Reversed

Protection and current limiting protection, 8. Reliable operation.

Output signal: The output is a unified 4-20mA signal;

Scope of application: Can be used with computer systems or other conventional instruments. Can also be made of explosion-proof or fire-proof measuring instruments.

SBW series temperature transmitter module is 24V power supply, two-wire integrated transmitter. The product adopts imported integrated circuit to amplify the signal of thermal resistance or thermocouple and convert it into

4-20mA output current, or 0-5V output voltage. The armored transmitter can directly measure the temperature of the gas or liquid and is particularly suitable for low temperature range measurement, overcoming the condensation water