This intelligent single-flange level transmitter is a high-precision intelligent instrument product independently developed by our company based on 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 and static pressure, thereby improving measurement accuracy and reducing temperature drift. The 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, complete varieties 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 overseas markets. This series of 0.1 grade level transmitters can be widely used in electric power, metallurgy, petrochemical, pharmaceutical, instrumentation processing, and other industries.

Product Features

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

·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

·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, low maintenance workload, robust and vibration-resistant;

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

·Optional diaphragm materials for contact indication, 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 loop is Rmax=(E-10.5)/0.0236(Ω), as shown below:

      Installation in hazardous locations: flameproof Exd Ⅱ CT6

                        intrinsic safety 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 measuring 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 whole 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℃, silicone oil fill）

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

      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/range）% span;

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

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

    　　　 Includes the total error of span and zero point, which is ±0.75%/55℃ of the maximum span.

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

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

     Electromagnetic radiation: compliant 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 joint: 316 stainless steel, Hastelloy C;

     “O” ring （in contact with measuring 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: polyurethane epoxy resin.

    Pressure connection fitting:

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

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

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

Installation and Use

Before installing and using the single-flange level transmitter, carefully read the product brochure and instruction manual in detail. 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 the construction site are caused by improper use and installation methods of the level transmitter. They can be summarized as follows. 1. Pipeline blockage or improper installation form, unreasonable pressure tapping point. 2. Leakage or blockage of the impulse 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 wiring of the transmitter, excessively high or low power supply voltage, and poor contact at the connection between the indicator and the instrument terminal. 4. Failure to install strictly according to technical requirements, and the installation method and field environment do not meet technical requirements.

All the above faults of 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 adoption of effective measures, the problems can 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 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, 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 being used for other purposes, and it is also strictly prohibited to carry out measurement on equipment without special reliable devices, 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 to prevent vibration, damage, or other factors during transportation from impairing accuracy.

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 to 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 the liquid impulse pipeline should avoid high points in the middle, and the layout of the gas impulse pipe 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 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 cleaning agent, the connection point of the cleaning agent 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 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

That is basically all. 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-guarantee policy 

  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 the main 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 failures 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 failure caused by improper use by the customer; 

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

   4、The product appearance is seriously damaged or deformed, the product identification is lost, and the product source cannot be identified; 

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

   6、Human factors. 

II. Lifetime Product Maintenance Service 

For defective products beyond the warranty period and within the scope of exemption, our company will provide lifetime maintenance for your products, and only charge maintenance cost fees and product transportation costs. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has 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, 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 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. 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 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 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 and do not participate in the 7-day no-reason return policy. Custom products have a delivery lead time and are not returnable or exchangeable.