This intelligent single-flange level transmitter is a high-precision intelligent instrument product independently researched, developed, and manufactured by our company based on many years of scientific research and practical experience.

      This single-flange level transmitter is a new-generation intelligent transmitter produced by adopting sensors manufactured with imported technology and integrating the advanced digital technology developed by our company. In principle, it adopts a direct digital capacitance circuit to replace the analog signal amplification circuit and A/D conversion circuit, and uses digital compensation technology to compensate for temperature and static pressure, thereby improving measurement accuracy and reducing temperature drift. The complete transmitter features small size, high reliability, and good long-term stability. This product has an extremely high performance-to-price ratio, making it a mainstream product in the transmitter market.

      This single-flange level transmitter features a novel design principle, a complete range of models and specifications, convenient installation and use, and safety and explosion-proof performance. It is especially renowned for high accuracy, small size, light weight, convenient adjustment, good long-term stability, strong one-way overload protection capability, and suitability for use in harsh environments. Therefore, it enjoys a very high reputation in domestic and international markets. This series of 0.1-grade level transmitters can be widely used in industries such as electric power, metallurgy, petrochemical, pharmaceutical, and instrument processing.

Product Features

·The use of a microprocessor provides greater flexibility and enhanced functions;

·Has strong self-diagnostic capability;

·Wide measuring range coverage 0～200m;

·Accuracy better than 0.1 grade, range ratio better than 40：1;

·Zero point and span adjustment do not affect each other;

·Supports both remote and local adjustment of range and zero point;

·Two-wire system, compliant with HART? protocol

·Built-in non-volatile memory in the sensor;

·Good stability, high accuracy, adjustable damping, and strong resistance to one-way overload;

·No mechanical transmission parts, less maintenance work, sturdy and vibration-resistant;

·All universal parts, interchangeability of sensor and electronic circuit board does not affect transmitter performance, making maintenance more convenient;

·Optional diaphragm material for contact with the medium, explosion-proof housing structure;

·Industry-proven superiority and reliability.

Performance Parameters

Technical specifications 　　

      Application medium: liquid

      Measurement range:0-100m

      Output signal: linear output: 4~20mA output superimposed with HART? protocol digital signal（two-wire system）

      Power      supply: externally supplied 24V DC（power supply range 14.5V~45V）

      Load characteristics: the maximum load resistance allowed in the load resistance circuit is Rmax=(E-10.5)/0.0236(Ω), as shown in the figure below:

      Installation in hazardous locations: flameproof type Exd Ⅱ CT6

                        intrinsic safety type Exia Ⅱ CT6

      Load characteristics: regardless of output, after positive and negative migration, the upper and lower limits of the range shall not exceed the limits of the range. At the minimum range, the maximum positive migration is 0.975URL; the maximum negative migration is -URL.

      Temperature range: medium temperature　　-29～149℃（silicone oil fill）;

  　                　　           -18～204℃（inert liquid fill）;15～315℃（inert liquid fill）;

                     Storage temperature           -40～100℃

    　              Operating temperature of the complete unit　　-40～85℃

                                           -20～70℃（with digital display head）;

      Relative humidity: 0～100%

      Static pressure and overpressure limits: 150lb flange: 41.37kPa（absolute pressure）~1.89MPa（at 37℃, silicone oil filled）

                             300lb flange: 41.37kPa（absolute pressure）~4.9MPa（at 37℃, silicone oil filled）

      Volume change: less than 0.16cm3

      Damping: time constant adjustable between 0.4～32.0s（silicone oil fill）.

      Startup time: 3s, no preheating required.

Performance indicators　　

     （Under standard test conditions with no migration, 316 stainless steel isolation diaphragm, and other standard test conditions.）

     Range ratio: 40：1

     Accuracy: when the range ratio is 1：1 to 10：1, it is ±0.15% of the calibrated range;

                    when the range ratio is 10：1 to 40：1, it is ±0.075（1+0.1URL/range）% range;

     Stability: six-month error is ±0.15% of the maximum range;

     Temperature effect: zero error is ±0.375%/55℃ of the maximum range.

    　　The total error including range and zero point is ±0.75%/55℃ of the maximum range.

     Power supply effect: less than 0.005%/V of the output range

     Vibration effect: on any axis, at a frequency of 200Hz, the resulting error is ±0.05%/g of the maximum range.

     Load effect: as long as the voltage input to the transmitter is higher than 12V, there is no load effect within the load operating area.

     Installation position effect: when the pressure diaphragm is in the vertical position, a zero shift error of up to 0.25kPa may occur; when the pressure diaphragm is in the horizontal position, a zero shift of up to 0.98kPa may occur（for insertion-type flanges, the insertion length variation must be added）, but it has no effect on the range, and this error can be corrected and eliminated. 

     Electromagnetic radiation: complies with IEC801 standard　

Structural Materials

    Diaphragm in contact with the medium, including gasket and other contact surfaces: 316 stainless steel, Hastelloy C, tantalum;

    Insertion part: 316 stainless steel, Hastelloy C;

    Vent/drain valve: 316 stainless steel, Hastelloy C;

    Flange and connector: 316 stainless steel, Hastelloy C;

     “O” ring（in contact with the measured medium）: fluororubber, nitrile rubber, ethylene-propylene;

    Mounting flange（non-contact）medium: galvanized carbon steel（or 316 stainless steel）;

    Bolts: galvanized carbon steel, 1Cr18Ni9, 0Cr17Ni4CuNb, 42CrMo;

    Fill fluid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: epoxy resin.

    Pressure guide fittings:

                      High-pressure side: 3″or 4″150lb flange or 300lb flange;

                      Low-pressure side: flange connection thread 1/4-18NPT（taper pipe thread）;

    Connector connection thread 1/2-14NPT（taper pipe thread）.　　

Installation and Use

Before installing and using the single-flange level transmitter, carefully read the product catalog and instruction manual in detail. During installation, the flange must not leak, and the range and wiring must be correct. The housing of the level transmitter generally needs to be grounded, and the signal cable must not be laid together with the power cable. Strong electromagnetic interference should be avoided around the transmitter. During use, the transmitter should be periodically verified in accordance with industry regulations.

On-site fault inspection Most faults occurring at construction sites are caused by improper use and installation methods of the level transmitter, which can be summarized in several aspects. 1. Pipeline blockage or improper installation form, unreasonable pressure tapping point. 2. Pressure guide pipe leakage or blockage, residual gas in the liquid-filled pipe or residual liquid in the gas-filled pipe, and deposits in the transmitter process flange, forming a measurement dead zone. 3. Incorrect transmitter wiring, excessively high or low power supply voltage, and poor contact at the connection between the indicator head and the instrument wiring terminal. 4. Failure to install strictly according to technical requirements, and the installation method and site environment do not meet the technical requirements.

All of the above faults of the level transmitter 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 prevent the level transmitter from being affected by corrosion, excessive viscosity, or crystallization of the measured medium, an isolation device should be installed;

(2) In order to ensure that the level transmitter is not affected by sudden changes or pulsating pressure of the measured medium, a buffer should be installed. Especially when pressure increases sharply or drops suddenly, it is most likely to damage and scrap the level transmitter, and may even damage the isolation diaphragm and cause leakage;

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

(5) Dedicated level transmitters are strictly prohibited from other uses, and it is also strictly prohibited to measure on equipment without special reliable devices, and it is even more strictly prohibited to use general level transmitters for level measurement of special media;

(6) For newly purchased level transmitters, metrological verification must be carried out before installation and use, so as to prevent vibration, damage, or other factors during transportation from damaging the accuracy of the level instrument.

Routine Maintenance

1、Check dimensions. Only appropriate dimensions can avoid wear

2、Keep the flange clean

3、Select an appropriate position

4、Careful cleaning

5、Keep dry

6、Avoid low-temperature interference

7、Prevent pressure overload

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 connect upward to the process pipeline, and its slope should be no less than 1/12;

3) For gas measurement, the pressure guide pipe should connect downward to the process pipeline, and its slope should be no less than 1/12;

4) The layout of liquid pressure guide pipelines should avoid high points in the middle, and the layout of gas pressure guide pipes should avoid low points in the middle;

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 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 detergent, the detergent connection should be close to the pressure tapping port of the process pipeline, and the pipelines through which the detergent passes should have the same length and diameter, and the detergent should be prevented from passing through the transmitter.

Selection Steps

The selection of a single-flange level transmitter is very important. Below, based on my work experience, I will talk about the selection of a single-flange level transmitter.

1、The operating environment of the single-flange level transmitter.

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

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

4、Accuracy.

5、Medium.

6、Supply voltage.

7、Output signal.

8、Shock and vibration.

9、Pressure response.

10、Flange size.

11、Electrical interface.

12、Safety certification.

13、Other additional functions

These are 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 implements the three guarantees 

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

   1、If general parts of the product fail and the product can be restored to the required use after replacement, free scheduled repair shall be provided; 

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

(II) Scope of exemption 

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

   1、The usage occasion is inconsistent with the parameters of the order contract;

   2、Product faults caused by improper customer use; 

   3、Customer self-repair and modification of the product; 

   4、Serious damage and deformation of product appearance, product identification lost, unable to identify product source; 

   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 exemption, our company will provide lifetime repair for your products, and only charge repair cost fees and product transportation costs. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly been engaged in the research, development, and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss metallux ceramic piezoresistive sensors, independently 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 level transmitters, anti-corrosion level transmitters, lightning-protection level transmitters, high-temperature guided-pressure level transmitters, straight-rod level transmitters, flange level transmitters, wind pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/RTDs, temperature transmitters, ultrasonic level meters

Notes 1. All supplied products are provided with product certificates and instructions, including product number, technical parameters, wiring, date of manufacture, 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 will be stable after preheating for 30 minutes. 5. If any abnormality is found during use, turn off the power, stop using it, inspect it, or directly contact our company's technical department. 6. During transportation and storage, restore the original packaging and store 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 incorrect wiring is not covered by the quality warranty）. 8. Special products are customized products, do not participate in 7-day no-reason returns, customized products have a lead time, and are non-returnable and non-exchangeable.