This pressure transmitter uses a high-precision, high-stability pressure sensing element from an internationally renowned company. Through a highly reliable amplification circuit and precise temperature compensation, it converts the pressure of the measured medium into standard electrical signals such as 4～20mADC、0～5VDC, 0～10VDC and 1～5VDC. High-quality sensors, exquisite packaging technology, and complete assembly processes ensure the excellent quality and optimum performance of this product. This product offers various interface forms and wiring methods, enabling it to meet customer needs to the greatest extent and making it suitable for matching use with various measurement and control equipment.

Working Principle

When the pressure signal acts on the sensor, the pressure sensor converts the pressure signal into an electrical signal, which is amplified by the differential amplifier and output amplifier, and finally converted by V/A voltage-current conversion into a 4-20mA standard current output signal that has a linear corresponding relationship with the liquid level pressure of the measured medium (liquid).

Features:

Compact size, high cost performance, high stability, high sensitivity

0～-0.1MPa to 0～250MPa

Strain gauge sensor  Diffused silicon sensor   Ceramic piezoresistive sensor optional

Stainless steel structure

Multiple range options, convenient for user adjustment

Optional accessories with adjustable zero point/full scale

Pressure types: gauge pressure, absolute pressure, vacuum

Accuracy: Class 1.0、Class 0.5、Class 0.25、Class 0.1

Optional compact integrated LCD display and meter head with switch output

Laser marking can be adopted to ensure product traceability

Applications: 

Hydraulic and pneumatic control systems

Liquid level measurement and control

Petrochemical, environmental protection, air compression

Power station operation inspection, locomotive braking systems

Thermal power generating units

Light industry, machinery, metallurgy

Building automation, constant-pressure water supply

Other automatic control and testing systems

Industrial process testing and control

Laboratory pressure calibration

Technical Parameters:

Measured medium Various liquids, gases, or steam compatible with 304/316 stainless steel

Measurement range Gauge pressure 0～0.01MPa to 0～250MPa Absolute pressure 0～0.1MPa to 0～250MPa Vacuum 0～-0.1MPa

Overload pressure 2 times full scale or 300MPa(the smaller value applies)

Output signal 4～20mADC(two-wire) 0～10VDC, 0～5VDC, l～5VDC, 1-10VDC(three-wire)

Supply voltage 9～36VDC(two-wire), 24±5VDC(three-wire)

Medium temperature -30～+85℃

Ambient temperature -20～+85℃

Storage temperature -40～+90℃

Relative humidity ≤ 95％(40℃)

Rise time ≤5 milliseconds to reach 90％FS

Accuracy Class 1.0, Class 0.5, Class 0.25(comprehensive error including non-linearity, repeatability, and hysteresis)

Zero adjustment ±8％ of output range

Span adjustment ±20％ of output range

Temperature drift ≤±0.05％FS/℃(temperature range -20～85℃, including the temperature effects on zero point and span)

Temperature compensation range 0～70℃

Stability Typical: ±0.1％FS/year Maximum: ±0.2％FS/year

Medium-contact material 316 stainless steel/304 stainless steel

Housing material 304 or 316 stainless steel

Installation method Threaded installation

Pressure connection M20×1.5、M12×l、Gl/4、Gl/2 male thread, etc.

Electrical connection Four-core shielded cable (protection grade IP65) aviation plug DIN connector

Installation and Use

Before installing and using the pressure transmitter, carefully read the product brochure and instruction manual. During installation, the pressure connection must not leak, and ensure that the range and wiring are correct. The housing of pressure sensors and transmitters generally needs to be grounded. Signal cables must not be laid together with power cables, and strong electromagnetic interference should be avoided around the sensor and transmitter. During use, sensors and transmitters should be periodically verified according to industry regulations.

On-site troubleshooting Most faults occurring at the construction site are caused by improper use and installation of pressure sensors. In summary, there are several aspects. 1. Primary components (orifice plates, remote measurement joints, etc.) are blocked or incorrectly installed, and the pressure tapping point is unreasonable. 2. The pressure guide pipe leaks or is blocked, there is residual gas in the liquid-filled pipe or residual liquid in the gas-filled pipe, and deposits exist in the process flange of the transmitter, forming a measurement dead zone. 3. The transmitter wiring is incorrect, the power supply voltage is too high or too low, and there is poor contact at the connection between the indicator head and the instrument wiring terminals. 4. Installation is not carried out strictly according to technical requirements, and the installation method and site environment do not meet the technical requirements.

The above faults of pressure sensors and transmitters will cause abnormal transmitter output or inaccurate measurement, but through careful inspection, strict use and installation according to technical requirements, and timely effective measures, the problems can all be eliminated. For faults that cannot be handled, the transmitter should be sent to the laboratory or manufacturer for further inspection.

Installation of Additional Devices

(1)In order to ensure that the instrument is not affected by corrosion of the measured medium or by excessive viscosity or crystallization, an isolation device should be installed;

(2)In order to ensure that the instrument is not affected by rapid changes in the measured medium or pulsating pressure, a buffer should be installed. Especially during sharp pressure increase and pressure drop, pressure instruments are most likely to be damaged and scrapped, and even the spring tube may rupture, causing leakage;

(3)In order to ensure that the instrument is not affected by vibration, the pressure instrument should be equipped with vibration damping and fixing devices;

(4)In order to ensure that the instrument is not affected by the high temperature of the measured medium, a bend tube device filled with liquid should be installed;

(5)Special dedicated instruments are strictly prohibited from being used for other purposes, and it is also strictly prohibited to measure on devices without special reliable protection. It is even more strictly prohibited to use ordinary pressure gauges for pressure measurement of special media;

(6)For newly purchased pressure testing instruments, metrological verification must be carried out before installation and use to prevent vibration, damage, or other factors during transportation from impairing accuracy.

Routine Maintenance

1、Check the dimensions of the mounting hole

2、Keep the mounting hole clean

3、Select an appropriate location

4、Clean carefully;

5、Keep dry:

6、Avoid low-temperature interference

7、Prevent pressure overload

8Pressure transmitters should be checked once a week and inspected once a month, mainly to remove dust inside the instrument, carefully inspect electrical components, and frequently calibrate the output current value. The inside of the pressure transmitter is weak current, so it must be isolated from external strong current.

Solutions to Errors

1)The pressure guide pipe should be as short as possible;

2)When measuring liquid or steam, the pressure guide pipe should be connected upward to the process pipeline, and its slope should not be less than 1/12;

3)For gas measurement, the pressure guide pipe should be connected downward to the process pipeline, and its slope should not be less than 1/12;

4)The layout of liquid pressure guide piping should avoid intermediate high points, and the layout of gas pressure guide piping should avoid intermediate low points;

5)The two pressure guide pipes should maintain the same temperature;

6)To avoid friction effects, the diameter of the pressure guide pipe should be large enough;

7)There should be no gas present in the liquid-filled pressure guide pipe;

8)When using isolation liquid, the liquid in the pressure guide pipes on both sides should be the same;

9)When using a cleaning agent, the cleaning agent connection should be close to the pressure tapping port of the process pipeline. The pipelines through which the cleaning agent passes should have the same length and diameter, and the cleaning agent should be prevented from passing through the transmitter.

Selection Steps

The selection of a pressure transmitter is very important. Based on my work experience, let me talk about pressure transmitter selection.

1、The operating environment of the transmitter.

2、Range. (For details, refer to pressure transmitter parameters - range)

3、Overload pressure. (Generally, differential pressure also requires the parameter of static pressure)

4、Accuracy.

5、Pressure medium.

6、Supply voltage.

7、Output signal.

8、Impact and vibration.

9、Pressure response.

10、Pressure connection.

11、Electrical connection.

12、Safety certification.

These are basically the main points. However, different transmitters may have different accessories, etc., so pay attention during selection.

After-sales Service

I、Quality Assurance Service

(I)Product quality is subject to the three-guarantee policy

  The product warranty period is one year from the date of delivery. During the warranty period, if there is a quality problem with the product itself, our company provides free repair, replacement, and return services.

   1、If general parts of the product fail and can meet the use requirements after replacement, we are responsible for free scheduled repair;

   2、If major parts of the product fail and cannot be repaired on schedule, a qualified product of the same model and specification will be replaced;

(II)Scope of disclaimer

  Within the warranty period, product failures caused by the following human factors and force majeure are not covered by free repair, replacement, and return services:

   1、The application occasion is inconsistent with the parameters in the order contract;

   2、Product failure caused by improper use by the customer;

   3、The customer repairs and modifies the product without authorization;

   4、The product appearance is severely damaged or deformed, and the product identification is lost, making it impossible to identify the source of the product;

   5、Product damage caused by natural disasters such as earthquakes, floods, and fires;

   6、Human factors.

II、Lifetime Product Repair Service

 For faulty products beyond the warranty period and within the scope of disclaimer, our company will provide lifetime repair service for your product, and only charge repair cost fees and product transportation fees.

Our company specializes in the production of pressure transmitters!

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly engaged in the R&D and production of pressure, liquid level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss metallux ceramic piezoresistive sensors, self-developed ceramic capacitive pressure sensors. Diffused silicon, ceramic piezoresistive, strain gauge, metal capacitive, ceramic capacitive pressure transmitters, remote pressure transmitters, high-temperature pressure transmitters, flush diaphragm pressure transmitters, anti-corrosion pressure transmitters, integrated/split liquid level transmitters, anti-corrosion liquid level transmitters, lightning protection liquid level transmitters, high-temperature pressure-guided liquid level transmitters, rigid rod liquid level transmitters, flange liquid level transmitters, air pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/RTDs, temperature transmitters, ultrasonic level gauges

Notes 1.All supplied products are provided with product certificates and instruction manuals, including product number, technical parameters, wiring, factory date, etc. Please carefully check them to avoid misuse.2.Wiring should be carried out strictly in accordance with our company's instructions for use.3.This product is a precision instrument. Random disassembly, collision, dropping, or poking the sensor with sharp tools is prohibited.4.The transmitter can work immediately after power-on, but the output becomes stable after 30 minutes of warm-up.5.If any abnormality is found during use, the power should be turned off, use should be stopped, and inspection should be carried out, or contact our company's technical department directly.6.During transportation and storage, restore the original packaging and store it in a cool, dry, and ventilated warehouse.7.The quality warranty period is 12 months (damage caused by improper use such as pressure overload and wiring errors is not covered by the quality warranty).8.Special products are customized products, do not participate in the 7-day no-reason return policy, custom-made products have a delivery period, and are non-returnable and non-exchangeable.