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 of intelligent transmitter produced by adopting sensors manufactured with imported technology and combining them with 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 adopts 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, a complete range of models and specifications, easy 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

·Due to the use of a microprocessor, flexibility is increased and functions are enhanced;

·Has 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 moving parts, low maintenance workload, robust and vibration-resistant;

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

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

·Proven superiority and reliability in 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 resistor circuit is 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 or negative migration, the upper and lower limits of the 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 filled);

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

                     Storage temperature           -40～100℃

    　              Complete unit operating temperature　　-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℃, filled with silicone oil)

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

      Volume change: less than 0.16cm3

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

      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.)

     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）% of 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 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 region.

     Installation position effect: when the pressure diaphragm is in a vertical position, it may cause a zero-point change error up to 0.25kPa; when the pressure diaphragm is in a horizontal position, it may cause a zero-point change 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

    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 (non-contact) medium: galvanized carbon steel (or 316 stainless steel);

    Bolt: galvanized carbon steel, 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);

    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 range and wiring must be 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 verified in accordance with industry regulations.

On-site Fault Inspection Most faults occurring at construction sites are caused by improper use and installation of the level transmitter. In summary, there are several aspects. 1. Pipeline blockage or incorrect installation form, and unreasonable pressure tapping point. 2. Leakage or blockage in the pressure guide pipe, residual gas in the liquid-filled pipe or residual liquid in the gas-filled pipe, and sediment in the transmitter process flange, forming a measurement dead zone. 3. Incorrect wiring of the transmitter, excessively high or low power supply voltage, and poor contact at the connection between the indicator head and the instrument wiring terminals. 4. Failure to install strictly in accordance with technical requirements, and the installation method and site environment do not meet the 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 in accordance with 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, 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 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 bent tube device filled with liquid should be installed;

(5) Dedicated level transmitters are strictly prohibited from being used for other purposes, and it is also strictly prohibited to measure on devices without special reliable arrangements, and 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 to prevent accuracy damage caused 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 location

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 using isolation liquid, the liquids in the two impulse pipes should be the same;

9) When using a cleaning agent, the cleaning agent connection should be close to the pressure tapping port of the process pipeline, and 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, 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 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 calculated from the date of delivery and lasts for one year. During the warranty period, if the issue is due to the product's own quality, 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, we are responsible for free scheduled repair; 

   2、If major 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 are not covered by the free repair, replacement, and return service scope:

   1、The application 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、Serious damage and deformation of the product appearance, loss of product identification, making it impossible to identify the product source; 

   5、Product damage caused by natural disasters such as earthquakes, floods, and 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 products, 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, 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-protection 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 gauges

Precautions 1. All supplied products are accompanied by product certificates and instruction manuals, including product numbers, technical parameters, wiring methods, ex-factory dates, 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 power-on, but the output becomes stable after preheating for 30 minutes. 5. If any abnormality is found during use, turn off the power, stop using it, inspect it, or directly contact our company's technical department. 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 the 7-day no-reason return policy. Customized products have a delivery lead time and are non-returnable and non-exchangeable.