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 capacitive 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, and safety explosion-proof performance. It is especially renowned 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 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 increases flexibility and enhances 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

·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 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 　　

      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: external 24V DC power supply（power supply range 14.5V~45V）

      Load characteristics: the maximum load resistance Rmax allowed in the load resistance loop=(E-10.5)/0.0236(Ω), as shown below:

      Installation in hazardous locations: 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 limits of its range 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 the whole 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

      Damping: the time constant is 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 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: the six-month error is ±0.15% of the maximum range;

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

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

     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 input voltage to the transmitter is higher than 12V, there is no load effect within the load operating zone.

     Installation position effect: when the pressure diaphragm is in a vertical position, the zero shift error may be up to 0.25kPa; when the pressure diaphragm is in a horizontal position, the zero shift may be up to 0.98kPa（for insertion-type flanges, the variation caused by 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

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

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

    Fill fluid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: polyurethane epoxy resin.

    Pressure guide connector:

                      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 in detail. During installation, the flange must not leak, and the 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 inspected 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. These can be summarized in several aspects. 1．Pipeline blockage or incorrect installation form, unreasonable pressure tapping point. 2．Pressure guide pipe leakage or blockage, 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, poor contact at the connection between the indicator and the instrument terminal. 4．Failure to install strictly according to technical requirements, and the installation method and field environment do not meet technical requirements.

Any of the above faults 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 or by excessive viscosity or crystallization, 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 rupture, causing 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 other uses, and are also strictly prohibited from measuring on devices without special reliable protection, 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, in order to prevent the accuracy from being damaged by vibration, damage, or other factors during transportation of the level instrument.

Routine Maintenance

1、Check dimensions. Only appropriate dimensions can avoid wear

2、Keep the flange clean

3、Select an appropriate position

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 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) 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 detergent, the detergent connection should be close to the pressure tapping port of the process pipeline, and the pipes through which the detergent passes should have the same length and diameter, and the detergent 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, 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

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 is subject to the three guarantees 

  The product warranty period is one year calculated from the date of delivery. During the warranty period, if there are product quality problems caused by the product itself, our company provides free repair, replacement, and return services. 

   1、If general component failure occurs and use can be restored after replacement, we are responsible for free timely repair; 

   2、If major component failure occurs and it cannot be repaired on schedule, a qualified product of the same model and specification will be replaced; 

（II）Disclaimer scope 

  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 usage occasion is inconsistent with the parameters in the order contract;

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

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

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

   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 disclaimer scope, our company will provide lifetime repair service for your product, and only charge 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, rigid 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 gauges

Precautions 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, 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 preheating for 30 minutes.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 our company's technical department should be contacted directly.6.During transportation and storage, the original packaging should be restored and stored 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 wiring errors is not covered by the quality warranty）.8.Special products are customized products, do not participate in 7-day no-reason return, customization has a lead time, no return and no exchange.