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 practical experience.

      This single-flange level transmitter is a new generation of intelligent transmitter produced by adopting sensors manufactured 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 applies digital compensation technology to compensate for temperature and static pressure, thereby improving measurement accuracy and reducing temperature drift. The transmitter features 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, a complete range of models and specifications, convenient installation and use, and safe explosion-proof performance. It is especially renowned 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 very 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, instrumentation processing, and other industries.

Product Features

·The use of a microprocessor provides greater flexibility and enhanced functions;

·Strong self-diagnostic capability;

·Wide measuring range coverage of 0～200m;

·Accuracy better than 0.1 grade, turndown ratio better than 40：1;

·Zero point and span adjustments do not affect each other;

·Supports both remote and local adjustment of range and zero point;

·Two-wire system, compliant with the HART? protocol

·Sensor with built-in non-volatile memory;

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

·No mechanical transmission parts, low maintenance workload, sturdy and vibration-resistant;

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

·Optional diaphragm materials for contact with the medium, 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: 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 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 migration, the upper and lower limits of the range shall not exceed the limits of the 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 filling);

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

                      Storage temperature           -40～100℃

    　              Operating temperature of the whole unit　　-40～85℃

                                           -20～70℃ (with digital display head);

      Relative humidity: 0～100%

      Static pressure and overpressure limit: 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 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 span;

                    when the turndown ratio is 10：1 to 40：1, it is ±0.075（1+0.1URL/range）% span;

      Stability: the error over six months 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 the output span

      Vibration effect: on any axis, at a frequency of 200Hz, the induced 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, it may produce a maximum zero shift error of 0.25kPa; when the pressure diaphragm is in a horizontal position, it may produce a maximum zero shift of 0.98kPa (for insertion-type flanges, the insertion length variation shall be added), but it has no effect on the span, 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;

    Flanges and fittings: 316 stainless steel, Hastelloy C;

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

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

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

    Filling 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);

    Fitting 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 verified 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. They 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 sediment 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 terminal. 4. Failure to install strictly according to technical requirements, and the installation method and site environment do not meet the technical requirements.

All of the above faults in the level transmitter will cause abnormal transmitter output or inaccurate measurement, but after careful inspection, strict use and installation according to the 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 the 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 device should be installed. Especially during sharp pressure increase and pressure drop, the level transmitter is most likely to be damaged and scrapped, and even the isolation diaphragm may be damaged, resulting in 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 carry out measurement on devices 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 vibration, damage, or other factors during transportation from damaging the accuracy 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) 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 pipeline should avoid low points in the middle;

5) The two impulse pipes should maintain the same temperature;

6) In order 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 impulse pipes on both sides should be the same;

9) When using a purging agent, the connection point of the purging agent should be close to the pressure tapping point of the process pipeline, and the pipelines through which the purging agent passes should have the same length and diameter, and the purging 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 is subject to the Three Guarantees policy 

  The product warranty period is one year from the date of delivery. During the warranty period, if there is a quality problem with the product itself, our company will provide free repair, replacement, and return services. 

   1、If general parts of the product fail and can be restored to the required use after replacement, we shall be responsible for free scheduled repair; 

   2、If the main 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 the 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 appearance of the product is seriously damaged or deformed, and the product identification is lost, making it impossible to identify the product source; 

   5、Product damage caused by natural disasters such as earthquakes, floods, fires; 

   6、Human factors. 

II. Lifetime Product Maintenance Service 

For faulty products beyond the warranty period and within the scope of exemption, our company will provide lifetime maintenance for your products, charging only the maintenance cost and product transportation cost. 

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 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 instructions, including product number, technical parameters, wiring, date of manufacture, 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 will be stable after 30 minutes of preheating.5.If any abnormality is found during use, the power 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, restore the original packaging and store it in a cool, dry, 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.