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 and static pressure, thereby improving measurement accuracy and reducing temperature drift. The complete transmitter features small size, high reliability, and good long-term stability. With an extremely high performance-to-price ratio, this product has 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-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 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

·Due to the use of a microprocessor, flexibility is increased and functions are enhanced;

·Has very 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;

·Both remote and local span and zero point are adjustable;

·Two-wire system, compliant with HART? protocol

·Sensor has built-in non-volatile memory;

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

·No mechanical transmission parts, less maintenance work, 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 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: external power supply 24V DC（power supply range 14.5V~45V）

      Load characteristics: The maximum load resistance allowed in the load resistance loop 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 or negative migration, the upper and lower limits of its 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 complete unit　　-40～85℃

                                           -20～70℃（with digital indicator）;

      Relative humidity: 0～100%

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

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

      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 Indexes　　

     （Under standard test conditions with no migration, 316 stainless steel isolation diaphragm, and other standard test 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/span）% span;

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

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

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

     Power supply effect: less than 0.005%/V of the 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 the vertical position, a zero shift error of up to 0.25kPa may be generated; when the pressure diaphragm is in the horizontal position, a zero shift of up to 0.98kPa may be generated （for insertion-type flanges, the variation caused by insertion length shall be added）, but it has no effect on the span, and this error can be corrected and eliminated. 

     Electromagnetic radiation: compliant with IEC801 standard　

Construction 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 adapter: 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）;

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

    Fill liquid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: polyester epoxy resin.

    Pressure guide connection:

                      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 to 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 troubleshooting Most faults occurring at construction sites are caused by improper use and installation methods of the level transmitter. In summary, there are several aspects. 1．Pipeline blockage or incorrect installation form, and 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 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 in accordance with technical requirements, and the installation method and 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. However, 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 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 increase and pressure drop, the level transmitter is most likely to be damaged and scrapped, and even the isolation diaphragm may be damaged, resulting in leakage;

(3) In order to ensure that the level transmitter is not affected by the high temperature of the measured medium, a bent pipe 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 and reliable installations, and 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, so as to prevent vibration, damage, or other factors during transportation from impairing the accuracy of the level instrument.

Routine Maintenance

1、Check dimensions. Only proper dimensions can avoid wear

2、Keep the flange clean

3、Select an appropriate position

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 pipelines should avoid low points in the middle;

5) The two impulse pipes should maintain the same temperature;

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

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

8) When using isolation liquid, the liquids in the impulse 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, 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 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., which should be noted during selection.

After-sales Service

I、Quality Assurance Service 

（I）Product quality implements the three-guarantee policy 

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

   1、If the failure of general product parts can be restored to use requirements after replacement, free timely repair shall be provided; 

   2、If the main parts of the product fail and cannot be repaired on time, a qualified product of the same model and specification shall be replaced; 

（II）Scope of disclaimer 

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

   1、The application 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, and inability to identify the product source; 

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

   6、Human factors. 

II、Lifetime Product Maintenance Service 

For faulty products beyond the warranty period and within the scope of the disclaimer, our company will provide lifetime maintenance for your product, charging only the maintenance 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 and 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-protected 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 product certificates and instruction manuals, including product number, technical parameters, wiring, date of manufacture, 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; random disassembly, collision, dropping, and poking the sensor with sharp tools are 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 within the scope of quality assurance）.8.Special products are customized products, do not participate in 7-day no-reason return, customization has a delivery period, no return and no exchange.