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 intelligent transmitter manufactured 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 transmitter features a compact 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, convenient installation and use, and safe explosion-proof performance. It is especially well known 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-grade 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;

·It has very 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

·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, 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

      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 output, after positive and negative shift, the upper and lower limits of the range shall not exceed the limits of the measuring 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 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 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 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）% span;

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

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

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

     Load effect: as long as the input voltage 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 zero point change may produce an error of up to 0.25kPa; when the pressure diaphragm is in a horizontal position, the zero point change may produce an error of up to 0.98kPa (for insertion-type flanges, the insertion length variation 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　

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: cadmium-plated carbon steel (or 316 stainless steel);

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

    Filling liquid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: polyurethane epoxy resin.

    Pressure guiding connector:

                      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 catalog and instruction manual in detail. 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, 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 construction sites are caused by improper use and installation methods of the level transmitter. They can be summarized in several aspects. 1. Pipeline blockage or improper installation form, and 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 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 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 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 the 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 other uses, and it is also strictly prohibited to perform measurement on devices without special and reliable arrangements, 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, so as 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、Choose 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, 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 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 talk about the selection of a single-flange level transmitter.

1、Operating environment of the single-flange level transmitter.

2、Range. (For details, see 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 mainly the key 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 implements the three guarantees 

  The product warranty period is one year from the date of delivery. During the warranty period, if there are quality problems of 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、Improper use by the customer causes product failure; 

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

   4、The appearance of the product is seriously damaged or deformed, and the product identification is lost, making it impossible to identify the source of the product; 

   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 research, development, and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Its 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 meters

Notes 1. All supplied products are accompanied by product certificates and instruction manuals, including product number, technical parameters, wiring, ex-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. 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 preheating for 30 minutes. 5. If any abnormality is found during use, the power 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 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, have a customization lead time, and are non-returnable and non-exchangeable.