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 and 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 extremely high cost performance, making it 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, safety, and explosion protection. It is especially well known for high accuracy, small 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 domestic and international markets. This 0.1 class level transmitter series can be widely used in industries such as electric power, metallurgy, petrochemical, pharmaceutical, and instrument processing.

Product Features

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

·It has very 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 adjustments do not affect each other;

·Both remote and local range and zero point adjustment are available;

·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 unidirectional overload;

·No mechanical transmission parts, less maintenance work, sturdy and vibration-resistant;

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

·Optional diaphragm materials for parts in contact with the measured medium, explosion-proof housing structure;

·Superior performance and reliability proven by the industry.

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 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 migration, the upper and lower range limits 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 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 fill)

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

      Volume change: less than 0.16cm3

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

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

Performance Indexes　　

     (Under standard test conditions with no migration, 316 stainless steel isolation diaphragm, and other standard test conditions.)

     Turn down ratio: 40：1

     Accu      racy: 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;

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

     Temperature effect: zero-point 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 resulting 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, the maximum zero shift error may be 0.25kPa; when the pressure diaphragm is in a horizontal position, the maximum zero shift may be 0.98kPa (for insertion-type flanges, the insertion length variation must be added), but it has no effect on 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 connector: 316 stainless steel, Hastelloy C;

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

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

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

    Fill　 liquid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coat      ing: polyester 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 brochure 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 power cables, 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 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 in accordance with technical requirements, and the installation method and site environment do not meet the technical requirements.

All the above faults of the level transmitter will cause abnormal transmitter output or inaccurate measurement, but after careful inspection, strict use and installation according to technical requirements, and timely effective measures, the problems can 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 drastic changes or pulsating pressure of the measured medium, 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 rupture, causing leakage;

(3) In order to ensure that the level transmitter is not affected by the high temperature of the measured medium, a liquid-filled bent tube device 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 installations, 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 suitable 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 to 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 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 in the liquid-filled impulse pipe;

8) When isolation liquid is used, 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 pipes 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 pay attention 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 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 timely repair; 

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

(II) 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 usage occasion is inconsistent with the parameters of 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 or deformed, the product label 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 the disclaimer, our company will provide lifetime maintenance for your products, charging only maintenance cost fees and product transportation fees. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly engaged in the research, development, and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss metallux ceramic piezoresistive sensors, 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-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 meters

Notes 1. All supplied products are accompanied by product certificates and instructions, including product number, technical parameters, wiring, factory date, etc. Please carefully check them to avoid misuse. 2. Wiring should be carried out strictly in accordance with our company instructions. 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 supply should be turned off, use stopped, and inspection carried out, or contact our company 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 and do not participate in 7-day no-reason return; customized products have a delivery period and are non-returnable and non-exchangeable.