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 practice.

      This single-flange level transmitter is a new generation of intelligent transmitter manufactured by using sensors produced with imported technology, combined with 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. This product offers an extremely high performance-to-price ratio and has thus 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 both 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 provides greater flexibility and enhanced functions;

·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, little maintenance work, sturdy and vibration-resistant;

·All universal parts, interchangeability between the 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 　　

      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 resistor 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 output, after positive and negative shift, the upper and lower limits of its range shall not exceed the limits of the range. At the minimum range, the maximum positive shift is 0.975URL; the maximum negative shift is -URL.

      Temperature range: medium temperature　　　-29～149℃ (silicone oil filled);

  　                　　           -18～204℃ (inert liquid filled); 15～315℃ (inert liquid filled);

                      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: the time constant is adjustable between 0.4～32.0s (silicone oil filled).

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

Performance Indexes　　

      (under standard test conditions with no shift, 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 the calibrated range;

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

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

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

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

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

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

      Electromagnetic radiation: compliant with IEC801 standard　

Construction Materials

    Diaphragms 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 connector: 316 stainless steel, Hastelloy C;

      “O” ring (in contact with the measured medium): fluororubber, nitrile rubber, ethylene-propylene;

    Mounting flange (not in contact) medium: cadmium-plated carbon steel (or 316 stainless steel);

    Bolts: carbon steel galvanized, 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);

    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 correct range and wiring must be ensured. 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 in several aspects. 1. Pipeline blockage or incorrect installation form, and 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 sediment 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 according to technical requirements, and the installation method and on-site environment do not meet 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, 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 device should be installed. Especially during sharp pressure increases and drops, 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) A dedicated level transmitter is strictly prohibited from other uses, and it is also strictly prohibited from measuring on devices without special reliable protection. It is even more strictly prohibited to 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, so as to prevent vibration, damage, or other factors during transportation from affecting the accuracy of the level instrument.

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 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 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) In order to avoid friction effects, the diameter of the impulse pipe should be large enough;

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

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. Based on my work experience, the following discusses 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 is subject to 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, 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; 

(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 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 without authorization; 

   4、The product appearance is seriously damaged and deformed, and the product identification is lost, 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 exemption scope, our company will provide lifetime repair service for your product, only charging repair cost fees and product transportation costs. 

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, 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-proof 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 meters

Precautions 1.All supplied products are accompanied by product certificates and instruction manuals, including product numbers, technical parameters, wiring diagrams, factory dates, etc. Please check them carefully to avoid misuse. 2.Wiring should be carried out strictly according to 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 being powered on, but the output becomes stable after 30 minutes of preheating. 5.If any abnormality is found during use, the power supply should be turned off, use should be stopped, 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 the 7-day no-reason return policy, customized products have a lead time, and are non-returnable and non-exchangeable.