http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 17.88Change: -0.10
R/$ = 15.88Change: -0.04
Au 1237.82 $/ozChange: 0.47
Pt 955.50 $/ozChange: -4.00
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Letters About Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Sep 21, 2007

Coolant monitor protects refrigeration circuits

Back
Copper|Flow|Industrial|Measurement|Pipe|Power|System|Systems|Water|Flow|Systems|Pipe|Measurement
Copper|Flow|Industrial|Measurement|Pipe|Power|System|Systems|Water|Flow|Systems|Pipe|
copper|flow-company|industrial|measurement-company|pipe-company|power|system|systems-company|water|flow-industry-term|systems|pipe|measurement
© Reuse this Cooling manufacturer Jumo Aquis has developed the new Jumo Aquis 500 series with an electrode as an economical system to detect ammonia. Owing to its good thermodynamic properties, ammonia is often used as a coolant, not only in small refrigeration systems, but also in large industrial plants. However, ammonia is a corrosive and poisonous chemical and, as it can be a potential hazard, requires continuous monitor- ing. This is even more important if the plant concerned is being supplied with water from rivers or open waters.

Most refrigeration systems consist of a primary circuit, with ammonia, and a secondary circuit. The secondary circuit usually contains a mix of water and glycol or some other mixture. There can be a potential risk of leakage at the interface between the primary and secondary circuits, for instance the refrigeration piping can corrode. If this piping is made from copper, the wall thickness of the pipe may become so thinned by the chemical reaction of the copper with the ammonia that a hole occurs.

The ion-sensitive sensor of the Jumo Aquis 500 operates over a range of 0,01 mg/8467 to 20g/8467 and consists of a pH glass electrode and a reference electrode. Both electrodes are immersed in a special electrolyte. A membrane that is permeable to ammonia separates the pH and reference electrodes from the medium being measured.

The presence of ammonia in the sample medium is strongly dependent on the pH value. In the acidic range, there will be a predominance of ammonium ions (NH4+), which are not detected by the sensor. In order to achieve optimum detection of the ammonia, the Jumo has a special flow-through fitting for the ammonia sensor. This facilitates quick and easy connection of the sensor according to the process setup.

The corresponding transmitter/controller is easy to use through the simple menu-led opera-tion. In the normal display setting, the Jumo Aquis 500 shows the principal measurement and the temperature, either as a numerical display or as a bar graph. A trend indicator can also be activated.

The high level of enclosure protection allows the instrument to be used either as a panel- mounted instrument or as an on-site measuring device. Condensation in the electronics is prevented by a diffusion-open membrane. All versions can be fitted with up to two electrically isolated analog outputs, for 4 mV to 20 mV or 0 V to 10 V, as process value or control outputs. The type of output and the scaling are freely programmable.

Two additional outputs can be fitted with changeover relays. These relays enable simple limit monitoring as well as a more demanding PID control loop function. Three power supply versions permit operation with typical supply voltages of 12 V dc, 20 V to 53 V ac/dc and 110 V to 240 V ac.
Edited by: Laura Tyrer
© Reuse this

To subscribe email subscriptions@creamermedia.co.za or click here
To advertise email advertising@creamermedia.co.za or click here
 
Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Heating and Cooling News
SCORCHING Cool Breeze evaporative coolers are suitable for South Africa’s hot and dry conditions as they have been built for the Australian outback, which is also hot and dry
Owing to the hot and dry conditions in South Africa, evaporative cooling company Air-Dale Engineering notes that the Cool Breeze evaporative coolers are well-suited for local use, as these conditions are prevalent in most parts of the country. The company has been...
LATEST COMPRESSOR TECHNOLOGY Companies are always keen to use the latest compressor technologies that can reduce their overall energy consumption
Compressor manufacturer CompAir has redesigned its 160 kW to 250 kW oil-injected screw compressors in an effort to meet evolving customer requirements. “By listening to our customer’s needs and wishes, and incorporating the latest technology and design concepts, we...
FULLPROOF The MULTICOOL 1100 cooler does not get affected by rain and dust
Companies operating in hot and harsh environments are benefiting from Germany-headquartered engineering electronic instruments protection company Intertec’s active cooling solution for small outdoor electronics and instrumentation equipment.  Intertec commercial...
More
 
 
Latest News
The Competition Tribunal on Friday gave a conditional go-ahead for mobile operators Cell C, MTN and Vodacom to buy out their respective subscriber bases, as South Africa’s last independent service provider Altech Autopage calls it a day. The Allied Electronics...
The drought in Southern Africa could become one of the worst on record should the current below-normal rainfall continue, the United Nations (UN) World Food Programme said this week. The El Niño conditions presently being experienced in the region had resulted in a...
Kelibone Masiyane has been appointed the new MD of PPC Zimbabwe, succeeding Njombo Lekula, who had recently been redeployed as MD of PPC’s international operations. Masiyane would be supported by new PPC commercial director Iain Sheasby and new PPC GM of finance...
More
 
 
Recent Research Reports
Construction 2016: A review of South Africa's construction industry (PDF Report)
Creamer Media’s Construction 2016 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; key participants; local demand; geographic diversification; corporate activity; black economic...
Energy Roundup – February 2016 (PDF Report)
The February 2016 roundup covers activities across South Africa for December 2015 and January 2016 and includes details of a Government Gazette notice that confirms Cabinet’s decision to move ahead with the 9 600 MW nuclear procurement programme; State-owned power...
Energy Roundup - December 2015 (PDF Report)
The December 2015 roundup includes details of State-owned utility Eskom’s application to claw back R22.8-billion; South Africa’s ranking as an investment destination for renewable energy; and a nuclear expert’s thoughts on reactor designs for South Africa’s nuclear...
Water 2015: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2015 Report considers the aforementioned issues, not only in the South African context but also in the African and global context in terms of supply and demand, water stress and insecurity, and access to water and sanitation, besides others.
Input Sector Review: Pumps 2015 (PDF Report)
Creamer Media’s 2015 Input Sector Review on Pumps provides an overview of South Africa’s pumps industry with particular focus on pump manufacture and supply, aftermarket services, marketing strategies, local and export demand, imports, sector support, investment...
Liquid Fuels 2015: A review of South Africa's liquid fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2015 Report examines these issues in the context of South Africa’s business environment; oil and gas exploration; fuel pricing; the development of the country’s biofuels industry; the logistics of transporting liquid fuels; and...
 
 
 
 
 
This Week's Magazine
WIDENING FLEXIBILITY The trailers have a 3-m-wide (2-file) and 4.3-m-wide (2-file) configuration
Lifting, transporting, installing and ballasting solutions provider Ale has expanded its global fleet of trailers and invested in the latest range of widening trailers that can be mechanically widened from 3 m to the desired width for any project. Ale ordered 48 axle...
The market for the BMW 7 Series in South Africa differs quite significantly from the rest of the world. China, the US and the Middle East almost exclusively buy the long-wheel-base version, using the German manufacturer’s luxury high-end sedan as a chaffeur-driven...
January new-vehicle sales fell by 6.9%, to 48 615 units, compared with the same month last year. Statistics released by the Department of Trade and Industry show that the domestic new passenger-car market declined by 6.1%, to 34 936 units, compared with 12 months ago.
Information technology (IT) equipment and infrastructure multinational Dell is providing open infrastructure systems for clients so that they can use any systems, including innovative new systems, that suit their business needs, says Dell Europe, Middle East and...
South Africa’s State-owned defence industrial group, Denel, has set up another international partnership, based in Hong Kong. This new subsidiary is Denel Asia and it is a joint venture (JV) with South African private sector company VR Laser.
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks
Subscribe Now for $149 Close
Subscribe Now for $149