First Steps to Choose the Right Flow Meter

The first step in flow sensor selection is to determine if the flowrate information should be continuous or totalized, and whether this information is needed locally or remotely. If remotely, should the transmission be analog, digital, or shared? And, if shared, what is the required (minimum) data-update frequency? Once these questions are answered, an evaluation of the properties and flow characteristics of the process fluid, and of the piping that will accommodate the flowmeter, should take place.
Fluid and flow characteristics
The fluid and its given and its pressure, temperature, allowable pressure drop, density (or specific gravity), conductivity, viscosity (Newtonian or not?) and vapor pressure at maximum operating temperature are listed, together with an indication of how these properties might vary or interact. In addition, all safety or toxicity information should be provided, together with detailed data on the fluid’s composition, presence of bubbles, solids (abrasive or soft, size of particles, fibers), tendency to coat, and light transmission qualities (opaque, translucent or transparent?).
Pressure & Temperature Ranges
Expected minimum and maximum pressure and temperature values should be given in addition to the normal operating values when selecting flowmeters. Whether flow can reverse, whether it does not always fill the pipe, whether slug flow can develop (air-solids-liquid), whether aeration or pulsation is likely, whether sudden temperature changes can occur, or whether special precautions are needed during cleaning and maintenance, these facts, too, should be stated.


Based on 20 years experiences in the industry, JOYO M&C developed many products with invitational and patented technologies, most products and solutions are proven to be  with high competence in terms of functions and performances. JOYO M&C was awarded by Sinopec annual technology innovation awards for its invitational technology for its product and solutions of tank and terminal automation, by which operation is greatly faciliated and efficiency is greatly improved for customers.

What is a Flow Meter?

A flow meter (or flow sensor) is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. When choosing flowmeters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site. It is also recommended that the cost of the installation be computed only after taking these steps.

One of the most common flow measurement mistakes is the reversal of this sequence: instead of selecting a sensor which will perform properly, an attempt is made to justify the use of a device because it is less expensive. Those “inexpensive” purchases can be the most costly installations. This page will help you better understand flow meters.

Established in 1999, located at BDA Beijing, JOYO M&C is a high-tech company focusing on R&D and manufacturing of measurement and control instruments and integrated automation systems equipment for oil terminals, tank farms, refineries and petrochemical complexes.


About multi-point thermometer

The multi-point thermometer adopts a bimetal thermometer, thermocouple or thermal resistance integrated temperature transmission method, which not only meets the needs of on-site temperature measurement, but also meets the needs of long-distance transmission. It can directly measure -80- + 500 ℃ in various production processes Temperature measurement of liquid, vapor and gas medium and solid surface within the scope.

Uses: used to measure various temperature objects, the measurement range is extremely large, much larger than alcohol, mercury thermometer. It is suitable for high temperature areas such as steel making furnaces and coke ovens, and can also measure low temperature objects such as liquid hydrogen and liquid nitrogen.
Multi-point thermocouple thermometer is composed of multiple thermocouples, junction box and millivolt thermometer, additional cables and compensation thermocouples, etc. It is mainly used to measure the cylinders and total exhaust of diesel engines or other large diesel engines on ships The temperature of the tube.
1) The total error of the millivolt refers to the total error of the thermometer (divided error and error affected by the change of ambient temperature) should not exceed ± (1.5 + 0.08 | t |)% of the upper reading limit when the ambient temperature is 0— + 60 ℃.
2) Basic error of complete thermometer: ± 2.5%
3) Dimensions: millivoltmeter: 294 × 210 × 127㎜ junction box: 263 × 107 × 92㎜
4) Basic error of millivolt thermometer: ± 1.5%
5) Weight: WRF-11C millivolt thermometer 3.5㎏ WRF-22C millivolt thermometer 4㎏ junction box 3.2㎏
6) Basic error of thermocouple: accord with JJG351-96
7) External resistance of millivolt thermometer: 10 ± 0.1Ω. (Including thermocouple, compensation wire, compensation thermocouple, cable and balance resistance).

Established in 1999, located at BDA Beijing, JOYO M&C is a high-tech company focusing on R&D and manufacturing of measurement and control instruments and integrated automation systems equipment for oil terminals, tank farms, refineries and petrochemical complexes.

Improved Tank Gauging Topology

Fiber Ethernet Tank Farm Topology

The major cost in any tank gauging or tank farm automation project is the field wiring. Normally two-thirds (2/3) of the cost is for wire, conduit, electrical fittings, etc. The upgrade of older technology in the field is often delayed because of the capital needed to replace the communications infrastructure. This means the benefits are also delayed and costs you more money.

An ideal communications Topology would be designed to:

Reduce the cost of cabling vs. conventional wire
Increase the reliability and data throughput speed
Provide electrical isolation to field devices (against power surges and electrical storms)
Maintenance ease by using off the shelf components
Reduce system integration costs (electrical standards, protocols, communication devices, and software drivers)
Provide access to multiple users, i.e., Operations, Laboratory, Scheduling, Oil Movements, Engineering, Maintenance, Safety, Environmental, Marketing, Accounting, Management, and Corporate. On a local basis or an Enterprise solution (from/to anywhere via Intranet VPN)

From the Master Switch, fiber cable is run to field mounted industrial quality Smart Switches, thus establishing a Fiber Ethernet network. Depending upon the Smart Switch selected, one particular Master Switch can be cabled in a ring, i.e., a primary cable run with a return loop to the Master Switch.

The Master Switch sends a packet out over the primary fiber cable and awaits the receipt of the packet. If the packet is not returned, the Master Switch assumes that there is a fiber cable or switch problem. On the next communication, the packet is transmitted in both directions over the primary fiber cable and the return loop fiber cable. Diagnostics can then identify the location of the problem, i.e., device or fiber cable, as well as restore communication with all working network components.

The field installed Smart Switches then communicate to Ethernet devices (GSI CIM, E/RTU, NET/IFI, E/IFI, or E/TGI) or Ethernet ready Tank Gauges (MTG, CAP3, 2000/APTB).

It has installed systems using the Fiber Ethernet Topology since 1996. It is a field proven topology that reduces overall maintenance costs, and increases data throughput and speed. It allows communication for configuration and remote preventative maintenance with intelligent field devices.

FROM:Gauging Systems Inc.


Multifunctional Tank Gauge BJLM-80HA is designed for ambient and high pressure liquid tank gauge measurements. It has multiple functions measurements integrated in one gauge,  including measurement of level, density, temperature, water interface, and automatic calculation of volume and mass by temperature compensation for the liquid in the tank.


Digital Density Meters

Compared to Pycnometers and Hydrometers
Digital density
Manual methods are being replaced by digital density meters for many critical reasons. Even though digital density meters are more expensive, it is a necessary investment.

This comparison datasheet gives a description, applications, and advantages and disadvantages for the following instruments:

Benchtop digital density meter
Handheld digital density meter

Manual methods for density measurements: Manual methods like pycnometers and hydrometers are widely used for the determination of density and related values, e.g. specific gravity, alcohol%, BRIX°, API degrees, Baumé, Plato, etc. Although these methods are easy to use and quite inexpensive, they require expertise in every step of the manual operation protocols, which often affects the accuracy and reliability of the results. Most often, different operators will obtain different results for the same sample.

Digital methods for automatic density measurement: Digital density meters use the oscillation tube technology to measure very accurately the density of a sample in a short time. In addition, benchtop digital density meters use a built-in Peltier thermostat to control the temperature of the sample. The measurement is started by pressing a key, after a short time the result appears on the screen and can be printed, sent to a computer or exported to LIMS.