This intelligent single-flange level transmitter is a high-precision intelligent instrument product independently developed by our company on the basis of many years of scientific research and practice.

      This single-flange level transmitter is a new-generation intelligent transmitter manufactured by adopting sensors produced with imported technology and integrating 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 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 its extremely high cost performance, this product has become 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 well known for high accuracy, compact 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 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 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 span and zero point;

·Two-wire system, compliant with HART? protocol

·Sensor with built-in non-volatile memory;

·Good stability, high accuracy, adjustable damping, strong resistance to one-way overload;

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

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

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

·Industry-proven superiority and reliability.

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: maximum permissible load resistance in the load resistor circuit Rmax=(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 limits of the measuring range. 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 filled）

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

      Volume change: less than 0.16cm3

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

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

Performance Indexes　　

     （Under standard test conditions of 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 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 the maximum span；

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

    　　The total error including span and zero point 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 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 zone.

     Installation position effect: when the pressure diaphragm is in the vertical position, it may produce a zero shift error up to 0.25kPa; when the pressure diaphragm is in the horizontal position, it may produce a zero shift up to 0.98kPa（for insertion-type flanges, the insertion length variation shall be additionally considered）, but it has no effect on the span, 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 adapter: 316 stainless steel, Hastelloy C；

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

    Mounting flange（non-contact）medium: carbon steel cadmium plated（or 316 stainless steel）；

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

    Fill fluid: silicone oil or inert liquid；

    Electrical housing: low-copper aluminum alloy；

    Coating: polyester epoxy resin.

    Pressure connection fitting:

                      High-pressure side: 3” or 4” 150lb flange or 300lb flange；

                      Low-pressure side: flange connection thread 1/4-18NPT（taper pipe thread）；

    Adapter 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 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 the construction site are caused by improper use and installation of the level transmitter. In summary, there are several aspects. 1. Pipeline blockage or improper installation form, 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 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 head and the instrument wiring terminal. 4. Failure to install strictly according to technical requirements, and the installation method and site environment do not meet technical requirements.

All the above faults of 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 adoption of 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 of the measured medium, 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 in the measured medium or pulsating pressure, a buffer should be installed. Especially during sharp pressure increase and pressure drop, it is most likely to damage and scrap the level transmitter, and even cause the isolation diaphragm to rupture and leak;

(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 it is also strictly prohibited to measure on equipment without special reliable devices, 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 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 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 same temperature should be maintained between the two impulse pipes;

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 cleaning agent, the cleaning agent connection 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、Use 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 three guarantees 

  The product warranty period is one year from the date of delivery. During the warranty period, if there is any product quality problem, our company provides free repair, replacement, and return services. 

   1、If general parts of the product fail and the product can meet 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) Disclaimer scope 

  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、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 maintenance service 

For faulty products beyond the warranty period and within the disclaimer scope, 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 R&D 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 capacitance, 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-proof 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 meters

Notes 1. All supplied products are accompanied by product certificates and instructions, including product number, technical parameters, wiring, factory date, etc. Please check carefully to avoid misuse. 2. Wiring shall 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 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, inspection should be carried out, or our company's technical department should be contacted 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 lead time and are non-returnable and non-exchangeable.