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Wireless Remote Monitoring and Control Systems Offers Cost Effective Solution for Tank Level Monitoring System
APPLICATION:
When a chemical plant wanted to add level and temperature monitoring to a set of tanks on the edge of their property, the initial proposition was to run a HART cable from the control room to the tank site and, then, branch out to each tank and wire in the level and temperature sensors. The wire length would be several thousand feet between the two points and, then, more to wire sensors to each tank.
PRODUCT SUPPLIED:
CHALLENGE:
The cost and time associated with this wiring effort, however, was found to be enormous. In addition to the cost of expensive wire, trenching and running conduit was another large added cost. The proposed budget for this upgrade was close to $100K for just the connection costs.
SOLUTION:
Taking a more cost effective route, the chemical plant decided to use a wireless solution offered by Signal Fire remote monitoring products. Multi-drop HART wireless nodes were installed on the top of each tank and connected – locally – to the sensors associated with each tank. (Nodes serve as the wireless, long-distance communication link in the remote monitoring and control of assets such as tank levels. The nodes extract then transmit data from sensors via a wireless mesh network to a Gateway where data is available via a Modbus RTU or TCP interface.) The total cost of the equipment and installation was a small fraction of the cost of running cable alone and the start-up time was a few hours as opposed to weeks. Additionally, because it was so easy to add additional wireless measurement points, other monitoring points can be easily added to the network in the future.
Reprinted with permission from SignalFire.
When a chemical plant wanted to add level and temperature monitoring to a set of tanks on the edge of their property, the initial proposition was to run a HART cable from the control room to the tank site and, then, branch out to each tank and wire in the level and temperature sensors. The wire length would be several thousand feet between the two points and, then, more to wire sensors to each tank.
PRODUCT SUPPLIED:
CHALLENGE:
The cost and time associated with this wiring effort, however, was found to be enormous. In addition to the cost of expensive wire, trenching and running conduit was another large added cost. The proposed budget for this upgrade was close to $100K for just the connection costs.
SOLUTION:
Taking a more cost effective route, the chemical plant decided to use a wireless solution offered by Signal Fire remote monitoring products. Multi-drop HART wireless nodes were installed on the top of each tank and connected – locally – to the sensors associated with each tank. (Nodes serve as the wireless, long-distance communication link in the remote monitoring and control of assets such as tank levels. The nodes extract then transmit data from sensors via a wireless mesh network to a Gateway where data is available via a Modbus RTU or TCP interface.) The total cost of the equipment and installation was a small fraction of the cost of running cable alone and the start-up time was a few hours as opposed to weeks. Additionally, because it was so easy to add additional wireless measurement points, other monitoring points can be easily added to the network in the future.
Reprinted with permission from SignalFire.
Tunable Diode Laser Spectrometers Improve Combustion and Heating Process Performance
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| Yokogawa TDLS 8000 |
The implementation of a process instrument called a "tunable diode laser spectrometer" (TDLS) gives plant operators an excellent advantage in the management of combustion gases.
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| Yokogawa TDLS 220 |
Tunable diode laser spectrometers non-contact sensors are are optimal for use in corrosive, abrasive and condensing applications in the oil, petrochemical, electric power, iron and steel, and other industries.
For more information on tunable diode laser spectrometers, contact Classic Controls by calling 863-644-3642 or visit https://classiccontrols.com.
The Flexim FLUXUS F/G721 Ultrasonic Clamp-on Flow Measurement for Liquids and Gases
New hardware design and improved, powerful digital signal processing gives the Flexim FLUXUS F/G721 superiority over other non-intrusive ultrasonic flowmeters in terms of accuracy, reliability and versatility.
Markets:
- Oil & Gas
- Chemical Industries
- Water & Wastewater
- Pharmaceutical
- Food & beverage
- Semiconductor
Classic Controls
https://classiccontrols.com
863-644-3642
Ultrasonic, Transit-time Flowmeters
Ultrasonic flowmeters measure fluid velocity by passing high-frequency sound waves along the fluid flow path. Fluid motion influences the propagation of these sound waves, which may then be measured to infer fluid velocity.
Transit-time flowmeters, sometimes called counter propagation flowmeters, are an alternative to Doppler ultrasonic flowmeters. A transit-time ultrasonic flowmeter uses a pair of opposed sensors to measure the time difference between a sound pulse traveling with the fluid flow versus a sound pulse traveling against the fluid flow. Since the motion of fluid tends to carry a sound wave along, the sound pulse transmitted downstream will make the journey faster than a sound pulse transmitted upstream:
The rate of volumetric flow through a transit-time flowmeter is a simple function of the upstream and downstream propagation times:
Where:
Q = Calculated volumetric flow rate
k = Constant of proportionality
tup = Time for sound pulse to travel from downstream location to upstream location (upstream, against the flow)
tdown = Time for sound pulse to travel from upstream location to downstream location (downstream, with the flow)
An interesting characteristic of transit-time velocity measurement is that the ratio of transit time difference over transit time product remains constant with changes in the speed of sound through the fluid. When this equation is cast into terms of path length (L), fluid velocity (v), and sound velocity (c), the equation simplifies to Q=2kv/L, proving that the transit-time flowmeter is linear just like the Doppler flowmeter, with the advantage of being immune to changes in the fluid’s speed of sound. Changes in bulk modulus resulting from changes in fluid composition, or changes in density resulting from compositional, temperature, or pressure variations therefore have little effect on a transit-time flowmeter’s accuracy.
Reprinted from "Lessons In Industrial Instrumentation" by Tony R. Kuphaldt – under the terms and conditions of the Creative Commons Attribution 4.0 International Public License.
An interesting characteristic of transit-time velocity measurement is that the ratio of transit time difference over transit time product remains constant with changes in the speed of sound through the fluid. When this equation is cast into terms of path length (L), fluid velocity (v), and sound velocity (c), the equation simplifies to Q=2kv/L, proving that the transit-time flowmeter is linear just like the Doppler flowmeter, with the advantage of being immune to changes in the fluid’s speed of sound. Changes in bulk modulus resulting from changes in fluid composition, or changes in density resulting from compositional, temperature, or pressure variations therefore have little effect on a transit-time flowmeter’s accuracy.
Reprinted from "Lessons In Industrial Instrumentation" by Tony R. Kuphaldt – under the terms and conditions of the Creative Commons Attribution 4.0 International Public License.
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