This intelligent single-flange level transmitter is a high-precision intelligent instrument product independently researched, developed, and manufactured 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 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 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, and has therefore become a mainstream product in the transmitter market.

      This single-flange level transmitter features a novel design principle, complete varieties and specifications, convenient installation and use, and safety explosion protection. It is especially known 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 high reputation in both domestic and international markets. This series of 0.1-class level transmitters can be widely used in electric power, metallurgy, petrochemical, pharmaceutical, instrumentation processing, and other industries.

Product Features

·The use of a microprocessor increases flexibility and enhances functions;

·Strong self-diagnostic capability;

·Wide measuring range coverage 0～200m;

·Accuracy better than 0.1 class, 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

·The sensor has built-in non-volatile memory;

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

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

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

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

·Industry-proven superiority and reliability.

Performance Parameters

Technical Specifications 　　

      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 in the figure below:

      Installation in hazardous areas: flameproof type Exd Ⅱ CT6

                      intrinsically safe type Exia Ⅱ CT6

      Load characteristics: regardless of the 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℃

    　              Overall operating temperature　　-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）.

      Start-up time: 3s, no preheating required.

Performance Indicators　　

     （Under standard test conditions with no migration, 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 calibrated span;

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

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

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

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

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

     Vibration effect: on any axis, at a frequency of 200Hz, the induced error is ±0.05%/g of the maximum span 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, the maximum zero shift error that may be generated is 0.25kPa; when the pressure diaphragm is in a horizontal position, the maximum zero shift that may be generated is 0.98kPa（for insertion flanges, the variation due to insertion length shall be added）, but it has no effect on the span, and this error can be corrected and eliminated. 

     Electromagnetic radiation: complies with IEC801 standard　

Structural Materials

    Diaphragm 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 （non-contact） medium: cadmium-plated carbon steel （or 316 stainless steel）;

    Bolts: zinc-plated carbon steel, 1Cr18Ni9, 0Cr17Ni4CuNb, 42CrMo;

    Fill fluid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: polyurethane epoxy resin.

    Pressure connection 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, carefully read the product catalog and instruction manual in detail. During installation, the flange must not leak, and the range and wiring must be ensured correct. The housing of the level transmitter generally needs to be grounded, the signal cable must not be laid together with power cables, and strong electromagnetic interference should be avoided around the transmitter. During use, the transmitter should be periodically verified according to industry regulations.

On-site fault inspection Most faults occurring at construction sites are caused by improper use and installation methods of the level transmitter. They can be summarized into several aspects. 1. Pipeline blockage or incorrect installation form, 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, poor contact at the connection between the indicator head and the instrument terminal. 4. Failure to install strictly in accordance with technical requirements, and the installation method and site environment do not meet 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 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 of the measured medium or excessive viscosity and 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 be damaged, causing 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 are also strictly prohibited from measuring on devices without special reliable arrangements. It is even more strictly prohibited to 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 affecting 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 location

4、Clean carefully

5、Keep dry

6、Avoid low-temperature interference

7、Prevent pressure overload

Solutions to Errors

1) Make the impulse pipe 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 pipes should avoid low points in the middle;

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

6) 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 a purging agent, the connection point of the purging agent should be close to the pressure tapping port of the process pipeline. The pipelines through which the purging agent passes should have the same length and diameter, and the purging 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, see 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

That is mainly all. 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 parts of the product fail and can be restored to 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 exemption 

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

   1、The usage scenario is inconsistent with the parameters in the order contract;

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

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

   4、Severe 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, and fires; 

   6、Human factors. 

II. Lifetime Product Repair Service 

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

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has been mainly 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, 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 level transmitters, anti-corrosion level transmitters, lightning protection level transmitters, high-temperature guided-pressure level transmitters, rigid 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 gauges

Notes 1. All supplied products are accompanied by a product certificate and instruction manual, 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 preheating for 30 minutes. 5. If any abnormality is found during use, the power supply 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 incorrect wiring is not covered by the quality warranty）. 8. Special products are customized products, do not participate in 7-day no-reason return, customized products have a lead time, no return and no exchange.