This intelligent single-flange level transmitter is a high-precision intelligent instrument product independently researched, developed, and manufactured 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 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 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 and explosion protection. It is especially renowned for high accuracy, compact 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 both domestic and international markets. This series of 0.1 class level transmitters can be widely used in industries such as electric power, metallurgy, petrochemicals, pharmaceuticals, and instrument processing.

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 class, 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

·Sensor with built-in non-volatile memory;

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

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

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

·Optional diaphragm material for contact indication, explosion-proof housing structure;

·Industry-proven superiority and reliability.

Performance Parameters

Technical Specifications 　　

      Application: 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 allowable load resistance in the load resistance loop 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 shift, the upper and lower limits of the span shall not exceed the limits of the measuring range. At the minimum span, the maximum positive shift is 0.975URL; the maximum negative shift 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 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℃, silicone oil filled)

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

      Volume displacement: less than 0.16cm3

      Damping: time constant adjustable between 0.4～32.0s (silicone oil fill).

      Startup time: 3s, no preheating required.

Performance Indicators　　

      (Under standard test conditions with no shift, 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: the six-month error is ±0.15% of the maximum span;

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

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

      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 measuring 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 range.

      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 change in insertion length 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 connector: 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;

    Filling liquid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: polyurethane 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);

    Connector 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. During installation, the flange must not leak, and the measuring 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 the power cable, 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, which can be summarized in several aspects. 1. Pipeline blockage or improper 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 in accordance with technical requirements, and the installation method and on-site environment do not meet the technical requirements.

All the above faults occurring 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 adoption of 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 sharp changes or pulsating pressure of the measured medium, a buffer should be installed. Especially during sharp pressure increase and decrease, 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 bend pipe 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, and 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 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) 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 piping should avoid high points in the middle, and the layout of gas impulse piping should avoid low points in the middle;

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

6) In order 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 liquid 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 tap 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

That is mainly 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 guarantees 

  The product warranty period is calculated from the date of delivery and is one year. During the warranty period, if there is a quality problem 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 meet usage 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 factors and force majeure are not covered by free repair, replacement, and return services:

   1、The application occasion is inconsistent with the parameters in the order contract;

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

   3、The customer repairs and modifies the product by themselves; 

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

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

   6、Human factors. 

II. Lifetime Product Maintenance Service 

For faulty products beyond the warranty period and within the scope of exemption, 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 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 capacitance, 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, 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 gauges

Notes 1. All supplied products are provided with product certificates and instruction manuals, including product number, technical parameters, wiring, factory date, etc. Please check carefully to avoid incorrect use. 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 will be stable after 30 minutes of preheating. 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 incorrect wiring is not covered by the quality warranty). 8. Special products are customized products and do not participate in 7-day no-reason return; customization has a lead time, and no return or exchange is accepted.