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

      This single-flange level transmitter is a new generation of intelligent transmitter manufactured by adopting sensors produced 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 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 offers extremely high cost performance, 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, easy installation and use, and safety explosion-proof performance. It is especially known for high accuracy, small size, light weight, convenient adjustment, good long-term stability, strong unidirectional 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 electric power, metallurgy, petrochemical, pharmaceutical, instrument processing, and other industries.

Product Features

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

·Strong self-diagnostic capability;

·Wide measuring range coverage 0～200m;

·Accuracy better than 0.1 grade, turndown 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

·Sensor with built-in non-volatile memory;

·Good stability, high accuracy, adjustable damping, and strong unidirectional overload resistance;

·No mechanical transmission parts, low maintenance workload, sturdy and vibration-resistant;

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

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

·Industry-proven superiority and reliability.

Performance Parameters

Technical indicators    

      Applicable medium: liquid

      Measuring 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 below:

      Installation in hazardous locations: flameproof type Exd Ⅱ CT6

                      intrinsically safe type Exia Ⅱ CT6

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

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

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

                     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 limit: 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 filling）.

      Startup time: 3s, no preheating required.

Performance indicators   

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

     Turndown ratio: 40：1

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

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

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

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

    　　 Including the total error of range and zero point, it is ±0.75%/55℃ of the maximum range.

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

     Vibration effect: on any axis, at a frequency of 200Hz, the induced 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 a vertical position, it may produce a zero-point shift error of up to 0.25kPa; when the pressure diaphragm is in a horizontal position, it may produce a zero-point shift of up to 0.98kPa（for insertion-type flanges, the insertion length variation shall be added）, but it has no effect on the range, and this error can be corrected and eliminated. 

     Electromagnetic radiation: compliant with IEC801 standard  

Structural Materials

    Diaphragms in contact with the medium, including gaskets 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 adapter: 316 stainless steel, Hastelloy C;

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

    Mounting flange（not in contact with the medium）material: 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:      polyurethane 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）;

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

Installation and Use

Before installing and using the single-flange level transmitter, please read the product brochure and instruction manual carefully. During installation, the flange must not leak, and the measuring range and wiring must be correct. The housing of the level transmitter generally needs to be grounded, the signal cable must not be laid together with the power cable, and 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, and unreasonable pressure tapping point. 2. Leakage or blockage of the pressure guide pipe, residual gas in the liquid-filled pipe or residual liquid in the gas-filled pipe, and deposits in the process flange of the transmitter, 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 on-site environment do not meet the technical requirements.

Any of the above faults in the level transmitter will cause abnormal transmitter output or inaccurate measurement, but through careful inspection, strict use and installation in accordance with 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 the manufacturer for further inspection.

Installation of Additional Devices

(1) In order to prevent the level transmitter from being affected by corrosion of the measured medium, excessive viscosity, or crystallization, an isolation device should be installed;

(2) In order to ensure that the level transmitter is not affected by sudden changes in the measured medium or pulsating pressure, a buffer should be installed. Especially during sharp pressure increases and decreases, the level transmitter is most likely to be damaged and scrapped, and even the isolation diaphragm may rupture, resulting in 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 carry out measurement on devices without special reliable arrangements, let alone use ordinary level transmitters for level measurement of special media;

(6) For newly purchased level transmitters, metrological verification must be carried out before installation and use, 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、Choose an appropriate position

4、Clean carefully

5、Keep dry

6、Avoid low-temperature interference

7、Prevent pressure overload

Solutions for Errors

1) The impulse pipe should be as short as possible;

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

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

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

5) The same temperature should be maintained between the two impulse pipes;

6) In order to avoid friction effects, the diameter of the impulse pipe should be large enough;

7) There should be no gas in the liquid-filled impulse pipe;

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

9) When using cleaning agent, the cleaning agent connection should be close to the pressure tapping port of the process pipeline, and 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 single-flange level transmitter is very important. Below, based on my work experience, I will discuss the selection of a single-flange level transmitter.

1、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 considerations. However, different transmitters may have different accessories, etc., so attention should be paid during selection.

After-sales Service

I. Quality Assurance Service 

(I) Product quality implements the three guarantees 

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

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

   2、If major components 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 exemption 

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

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

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

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

   4、Serious damage and deformation of the product appearance, loss of product identification, making it impossible to identify the product source; 

   5、Product damage caused by natural disasters such as earthquakes, floods, 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 maintenance for your products, only charging maintenance cost fees and product transportation costs. 

Since its establishment, Xi'an Shenghong Chuang Instrument Co., Ltd. has mainly been engaged in the R&D and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss metallux ceramic piezoresistive sensors and 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, rigid rod level transmitters, flange level transmitters, air pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/RTDs, temperature transmitters, ultrasonic level gauges

Precautions 1.All supplied products are accompanied by product certificates and instructions, including product number, technical parameters, wiring, factory date, etc. Please check carefully 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. Arbitrary disassembly, collision, dropping, and probing the sensor with sharp tools are prohibited. 4.The transmitter can work immediately after power-on, but the output stabilizes 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 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 7-day no-reason return, custom-made products have a lead time, and are neither returnable nor exchangeable.