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 intelligent transmitter produced by adopting sensors manufactured with imported technology and integrating the advanced digital technology developed by our company. In principle, it uses a direct digital capacitance circuit to replace the analog signal amplification circuit and A/D conversion circuit, and applies 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 cost-performance ratio and has therefore 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, convenient installation and use, and safety explosion-proof characteristics. It is especially well 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 both domestic and international 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

·The use of a microprocessor provides greater flexibility and enhanced functions;

·It 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 adjustments do not affect each other;

·Supports both remote and local adjustment of range and zero point;

·Two-wire system, compliant with HART? protocol

·Non-volatile memory built into the sensor;

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

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

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

·Optional diaphragm materials for the wetted parts, explosion-proof housing structure;

·Proven superiority and reliability in the industry.

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: maximum allowable load resistance in the load resistance circuit Rmax=(E-10.5)/0.0236(Ω), as shown below:

      Installation in hazardous locations: flameproof Exd Ⅱ CT6

                        intrinsically safe Exia Ⅱ CT6

      Load characteristics: regardless of the 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 complete 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: adjustable time constant 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 isolating 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 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% of the maximum span/55℃.

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

      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 a vertical position, it may produce a maximum zero shift error of 0.25kPa; when the pressure diaphragm is in a horizontal position, it may produce a maximum zero shift of 0.98kPa (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　

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 adapter: 316 stainless steel, Hastelloy C;

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

    Mounting flange (non-contact) medium: cadmium-plated carbon steel (or 316 stainless steel);

    Bolts: carbon steel zinc-plated, 1Cr18Ni9, 0Cr17Ni4CuNb, 42CrMo;

    Fill liquid: 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);

    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 in detail. During installation, the flange must not leak, and ensure the range and wiring are correct. The housing of the level transmitter generally needs to be grounded, the signal cable must not be laid together with power cables, 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 construction sites are largely 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 impulse line, residual gas in the filling liquid line or residual liquid in the filling gas line, 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 according to technical requirements, and the installation method and 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 according to 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 abrupt changes or pulsating pressure of the measured medium, a buffer 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 rupture, 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 tube device filled with liquid should be installed;

(5) Dedicated level transmitters are strictly prohibited from other uses, and it is also strictly prohibited to measure on devices without special reliable arrangements, and it is even more 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 accuracy.

Routine Maintenance

1、Check dimensions. Only appropriate dimensions can avoid wear

2、Keep the flange clean

3、Select an appropriate location

4、Clean carefully

5、Keep dry

6、Avoid low-temperature interference

7、Prevent pressure overload

Solutions for 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, with a slope not less than 1/12;

3) For gas measurement, the impulse pipe should be connected downward to the process pipeline, with a slope not 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 point 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 discuss 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 

(I) Product quality implements 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 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 service 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 factors are not covered by free repair, replacement, and return services:

   1、The application conditions are inconsistent with the parameters in the order contract;

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

   3、Customer's unauthorized repair and modification of the product; 

   4、Severe external damage and deformation of the product, loss of product identification, making it impossible to identify the source of the product; 

   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 scope of exemption, our company will provide lifetime repair service for your product, charging only the repair 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 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, 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 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, or poking the sensor with sharp tools is prohibited. 4. The transmitter can work immediately after power-on, but the output becomes stable after 30 minutes of preheating. 5. If any abnormality is found during use, the power should be turned off, use should be stopped, inspection should be performed, or our company's technical department should be contacted directly. 6. During transportation and storage, restore the original packaging and store it in a cool, dry, 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 custom-made products and do not participate in the 7-day no-reason return policy. Customized products have a delivery period and are non-returnable and non-exchangeable.