Smart temperature transmitter

1 Technical parameter editing

System transmission accuracy: ±0.2%×F·S

Cold-junction temperature compensation accuracy: ±0.1% Allowable lead resistance when measuring thermal resistance: ≤50Ω

Working temperature: Industrial standard -10～+55°C

Current output allows external load impedance: 0~500Ω for 4-20mA output; 0~1KΩ for 0-10mA output requires more load capacity. Please specify when ordering.

Electromagnetic compatibility: in accordance with IEC61000-4-4.

Input / output / power / communication / insulation between two channels: ≥ 1500V ac

Storage and transportation environment temperature: -40～+80°C

Power Supply: AC: AC 95~265V

DC: DC12V to 32V (reverse protection)

Input power: 0.9~1.8W (depending on the model, refer to the appendix of this manual for calculating the input power)

Communication interface: RS232 or RS485, MODBUS software agreement (optional).

Dimensions: width × height × depth: 22.5 × 100 × 115mm

2 Technical Features Edit

This product adopts advanced digital technology and possesses many advanced features that traditional analog instruments do not possess. It has excellent performance in suppressing high and low frequency interference signals, and can be reliably applied even in high-power frequency conversion control systems. At the same time, the application of digital technology completely overcomes the shortcomings of the linear differential of traditional temperature transmitters, and internally adopts many advanced technologies such as digital calibration, zero-free and full-scale potentiometers, automatic dynamic calibration zero, and automatic temperature drift compensation. IEC61000-4-4:1995 stipulates the requirements of the fourth type of (harmful industrial site) environment for the product's anti-electromagnetic interference, and the application of this series of technologies ensures that the product's stability and reliability are scientifically guaranteed.

The above technologies lead the international advanced level.

applicability

It can be used together with unit instrument clusters, DCS, PLC and other systems, and has been widely used in major projects in the fields of oil, petrochemical, manufacturing, power, and metallurgy.

Type 3 spectrum editing

model

Instructions

NPWD-

×

×

×

×

Universal temperature transmitter

Input circuit

The default is single loop

D

Double loop (isolated)

First output

1

4-20mA

2

1-5V

3

0-10mA

4

0-5V

5

0-10V

Second output

The default is no second output

1

4-20mA

2

1-5V

3

0-10mA

4

0-5V

5

0-10V

Power supply

The default is AC 220V

D

DC 24V

4 Other matters

1. Please specify the input signal type when ordering

Thermocouples: K, E, S, B, J, R, N

Thermal resistance: Pt100, Cu100, Cu50, BA1, BA2

Other input and output types are specially ordered.

2, explain:

A single loop input can have up to two outputs, and a dual loop input can only correspond to one output.

3, the output signal status when the input signal fails

Input signal faults include input line fault (including open circuit or short circuit) and over-range status. Its status is indicated by the “ALM” indicator on the panel. For details, see “Panel Indication”.

How to set the output status when inputting a fault:

Set the dial switch as follows (black indicates switch convex):

The upper limit keeps following the lower limit

Note:

1. The above settings are valid for both outputs simultaneously.

2. If no dial switch is installed, the default program setting output. (See "Programming and Calibration Techniques" for details)

4, the input signal failure corresponding to the output value:

Output status

Output after fault

Upper limit

Over 5% of the output power cap.

Lower limit

Below 5% of the lower limit of output power, 0 (for example, 0-5V) is used for the output lower limit of 0.

maintain

Maintain the output value 100ms before input failure

follow

In the 0-22mA range, the output and the input value change in synchronization

Panel instructions:

PWR: Power indicator.

ALM: input signal failure alarm indicator;

Input signal failure flashes at a high frequency of 3 times per second;

The indicator lights up when the overrange is input.

Wiring diagram:

Thermocouple Single Input Single Output Thermocouple Single Input Dual Output

Thermal resistance single input single output thermal resistance single input dual output

Thermocouple Dual Input Output Thermal Resistance Dual Input Dual Output

Note: 1. The power cable of the 220V power supply is connected with the same power terminal +, -.

2. Regarding the wiring of the “earth” line: If a reliable ground wire is connected, this product can be guaranteed to comply with the requirements of Class 4 (Harsh industrial site) environment for the product's anti-electromagnetic interference as stipulated in IEC61000-4-4:1995, if not Then, it can be guaranteed to meet the electromagnetic interference requirements of the product in the third category (general industrial site) environment.

Dimensions:

installation method:

1, 35mm rail-type installation, please note that the card is stable and firm during installation.

2. Please install it as vertically as possible to facilitate the heat dissipation inside the instrument.

Vertical installation

calibration:

This product adopts intelligent digital design, which can guarantee the accuracy within the specified range for a long time. If you need to calibrate, please select a dedicated field programmer, or you can use the software and adapter that are compatible with the computer.

Use environment:

The installation location shall not have strong vibration, electromagnetic shock exceeding the EMC standard from the signal side, power supply side and space, and there shall be no harmful substances that may cause serious corrosion to metal or plastic parts in the use environment.

5 Technical parameter editing

1. Accuracy: better than 0.5%;

2. Nonlinear distortion: better than 0.5%;

3. Rated working voltage: +24V±20%, limit working voltage: ≤35V;

4 power consumption: static 4mA, dynamic and equal loop current, internal limit 25mA +10%;

5. Rated input: 5A. . . . . . 1KA (38 specifications);

6. Perforation through the diameter of the round hole: 8, 9, 12, 20, 25, 30mm;

7. Output form: two-wire DC 4 ~ 20mA;

8. Output current temperature drift coefficient: ≤ 50ppm/°C;

9. Response time: ≤ 100mS;

10. Input / output insulation isolation strength:> AC3000V, 1min, 1mA;

11. Output load resistance: RL=V+-10V/0.02 (Ω );

Note: (1) When the standard V +24 V load impedance is 700Ω;

(2) RL = 250Ω Transforms resistance of 1 to 5V + total copper resistance of two transmission lines.

12. Input overload protection: 30 times 1min;

13. Output over-current limit protection: internal limit 25mA+10%;

Note: (1) International standard output over-current limit protection: internal limit 25mA+10%;

(2) Can be customized according to customer requirements: Internal limits 22mA+10%, 24mA+10%.

14. Two-wire port transient induced lightning and inrush current TVS suppression protection: TVS suppression of impact current 35A/20ms/1.5KW;

15. Two-wire port is set with reverse polarity protection of +24V power supply;

16. The output current is set to have a long-term short-circuit protection limit; the internal limit is 25mA+10%;

17. Working environment: -40°C-80°C, 10%-90%RH;

18. Storage temperature: -50°C-85°C;

19. Implementation of standards: GB/T13850-1998;

20. Series models, specifications, wiring schematics, product appearance, product photos, safety precautions.

8. Can you give an example of the main features of a 0.5-accuracy current transmitter for a certain brand of industrial grade?

1. True RMS two-wire transmitter designed for power automation 50/60Hz AC current measurement;

2. Using a single punch perforation through the core structure, the current transformer and the current transmitter are combined into an integrated design;

3. With 6 comprehensive protection features:

(1) Input overload protection;

(2) Output over-current limit protection;

(3) Output current long-term short-circuit protection;

(4) Transiently induced lightning and surge current TVS suppression protection for two-wire ports;

(5), working power over-voltage limit protection ≤ 35V;

(6) Working power supply reverse polarity protection.

4. Two-wire output wiring is the most advanced output mode in the current analog serial port, with six major advantages;

(1), less susceptible to the effects of parasitic thermocouples and resistance drop and temperature drift along the wire resistance, a very cheap and finer twisted pair wire can be used;

(2) When the output resistance of the current source is large enough, the voltage in the wire loop is sensed by the magnetic field coupling and will not have a significant influence because the current caused by the interference source is extremely small. In general, twisted pairs can be used to reduce the interference. ;

(3) Capacitive interference will cause receiver-resistor-related errors. For a 4-20mA two-wire loop, the receiver resistance is typically 250Ω (sample Uout = 1 to 5V). This resistance is small enough to produce significant errors. The allowable length of the wire is longer and farther than the voltage telemetry system;

(4) Each single reading device or recording device can switch between different channels with different lengths of wire, which does not cause the difference in accuracy due to the unequal length of the wire;

(5) Use 4mA for zero level to make it easy to judge whether the transmission line is open or the sensor is damaged (0mA state).

(6) It is easy to add anti-surge and lightning protection devices at the two-wire output port, which is conducive to safe lightning protection and explosion protection.

5. The original secondary side is highly insulated and isolated;

6. High reliability, high stability, high cost performance;

7. It is especially suitable for intelligent monitoring systems for load currents such as generators, motors, low-voltage distribution cabinets, air conditioners, fans, and street lamps.

8. Ultra-low power consumption, 0.096W in a single static state, 0.48W in full-scale power consumption, and 0.6W in the output current.