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 practice.

      This single-flange level transmitter is a new generation of intelligent transmitter produced by using sensors manufactured with imported technology and integrating 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 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 performance-to-price ratio and 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 safety and explosion-proof performance. 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 high reputation in domestic and international markets. This series of 0.1 grade level transmitters 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;

·Has strong self-diagnostic capability;

·Wide measuring range coverage 0～200m;

·Accuracy better than 0.1 grade, range 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 parts are interchangeable, and exchanging the sensor and electronic circuit board does not affect transmitter performance, making maintenance more convenient;

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

·Superior performance and reliability proven by the industry.

Performance Parameters

Technical Specifications 　　

      Application object: 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 allowed in the load resistor loop 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 the output, after positive or 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 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 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: 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 shift, 316 stainless steel isolation diaphragm, and other standard test conditions.)

     Range ratio: 40：1

     Accuracy: when the range ratio is 1：1 to 10：1, it is ±0.15% of the calibrated range;

                    when the range 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 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 the output range

     Vibration effect: on any axis, at a frequency of 200Hz, the induced error is ±0.05%/g of the maximum measuring 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 cause a zero point change error of up to 0.25kPa; when the pressure diaphragm is in a horizontal position, it may cause a zero point change of up to 0.98kPa (for insertion-type flanges, the variation due to insertion length must be added), but it has no effect on the range, and this error can be corrected and eliminated. 

     Electromagnetic radiation: complies 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);

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

    Fill liquid: silicone oil or inert liquid;

    Electrical housing: low-copper aluminum alloy;

    Coating: 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 range and wiring must be ensured to 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 according to industry regulations.

On-site fault inspection Most faults occurring on 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 incorrect installation form, and 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 sediment in the process flange of the transmitter, forming a measurement dead zone. 3. Incorrect transmitter wiring, excessively high or low 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 on-site environment do not meet technical requirements.

All of the above faults of the level transmitter may 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 of the measured medium or excessive viscosity and 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 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 bend pipe device filled with liquid should be installed;

(5) Dedicated level transmitters are strictly prohibited from other uses, and measurement on devices without special reliable protection is also strictly prohibited; 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 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、Choose an appropriate location

4、Clean carefully

5、Keep dry

6、Avoid low-temperature interference

7、Prevent pressure overload

Solutions to Errors

1) Keep the impulse pipe 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 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 isolating liquid, 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 product quality problems caused by 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 meet usage 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 usage conditions are inconsistent with the contract parameters;

   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 the product source unidentifiable; 

   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 exemption scope, our company will provide lifetime repair service for your products, charging only repair cost fees and product transportation costs. 

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. 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 protection level transmitters, high-temperature pressure-guided 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 meters

Notes 1. All supplied products are accompanied by a product certificate and instruction manual, 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's instructions for use. 3. This product is a precision instrument. Arbitrary disassembly, collision, dropping, and probing 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, the power supply 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, the original packaging should be restored and the product should be 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 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 policy. Customized products have a delivery lead time and are non-returnable and non-exchangeable.