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 practice.

      This single-flange level transmitter is a new-generation intelligent transmitter manufactured by using sensors produced with imported technology and integrating the advanced digital technology developed by our company. In principle, it adopts a direct digital capacitive circuit to replace the analog signal amplification circuit and A/D conversion circuit, and uses digital compensation technology to compensate temperature and static pressure, thereby improving measurement accuracy and reducing temperature drift. The 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, 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 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 electric power, metallurgy, petrochemical, pharmaceutical, instrument processing, and other industries.

Product Features

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

·Has strong self-diagnostic capability;

·Wide measurement 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 span and zero point;

·Two-wire system, compliant with HART? protocol

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

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

·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 the wetted parts, explosion-proof housing structure;

·Industry-proven superiority and reliability.

Performance Parameters

Technical Indicators 　　

      Applicable 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 resistor circuit is Rmax=(E-10.5)/0.0236(Ω), as shown in the figure 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 migration, the upper and lower limits of its range shall not exceed the range limits. 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 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 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）% of span;

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

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

    　　Including the total error of span and zero point, it 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 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 insertion length variation 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　

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 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);

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

    Fill fluid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: 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）;

    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 brochure and instruction manual. 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, 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 the construction site are caused by improper use and installation methods of the level transmitter. They can be summarized in 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 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, with installation method and site environment not meeting 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 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 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 measure on devices without special reliable devices, let alone use a general level transmitter 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 accuracy.

Routine Maintenance

1、Check dimensions. Only suitable 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) The pressure guide pipe should be as short as possible;

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

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

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

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

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 liquids in the pressure guide 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 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 attention should be paid during selection.

After-sales Service

I. Quality Assurance Service 

(1) Product quality is subject to the three-guarantee policy 

  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 can be restored to meet use requirements after replacement, free scheduled repair shall be provided; 

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

(2) Disclaimer 

  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 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、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, fires; 

   6、Human factors. 

II. Lifetime Product Repair Service 

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

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 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-proof level transmitters, high-temperature pressure-guided level transmitters, straight-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 meters

Notes 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. 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 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, not eligible for 7-day no-reason return, have a delivery lead time, and are non-returnable and non-exchangeable.