http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.12Change: 0.00
R/$ = 12.17Change: 0.12
Au 1181.15 $/ozChange: -4.65
Pt 1118.00 $/ozChange: -22.50
 
 
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 Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Sep 21, 2007

Coolant monitor protects refrigeration circuits

Back
Copper|Flow|Industrial|Measurement|Pipe|System|Systems|Water|Flow|Systems|Power|Water|Pipe|Measurement
Copper|Flow|Industrial|Measurement|Pipe|System|Systems|Water|Flow|Systems|Power|Water|Pipe|
copper|flow-company|industrial|measurement-company|pipe-company|system|systems-company|water-company|flow-industry-term|systems|power|water|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 Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Heating and Cooling News
Microbial growth in heating ventilation and air-conditioning (HVAC) systems with the subsequent contamination of indoor air is of increasing concern, as airborne bacteria and fungi have the potential to adversely impact human health by causing infections, allergic...
EFFICIENCY OPPORTUNITY The additional sizes provide more opportunities for contractors, engineers and owners to increase efficiency by reducing installation time and increasing safety
Mechanical pipe-joining systems manufacturer Victaulic has extended its patented installation-ready line, making Style 107 QuickVic rigid couplings for heating, ventilation and air-conditioning (HVAC) systems available in DN250-DN300 10- and 12-inch sizes. The...
SOPHISTICATION The system is supported by a sophisticated automation system that enables the user to save money without compromising comfort
South Africa is implementing stricter electricity- and water-saving regulations, which will automatically create opportunity for those operating in the green solutions industry, as companies and individuals will be forced to consider alternative heating and cooling...
More
 
 
Latest News
Zwelinzima Vavi
Updated 1 hour 51 minutes ago South Africa's main trade union federation, Congress of South African Trade Union (Cosatu), expelled Zwelinzima Vavi, its popular general secretary but a vocal critic of President Jacob Zuma and the ruling African National Congress, senior union sources told Reuters....
Updated 2 hours 28 minutes ago The South African government needs to take urgent steps to address ongoing trade concerns – particularly the long-running dispute over antidumping duties on American chicken – before US lawmakers start drafting 2015 trade legislation, the US Embassy’s Minister...
Zola Tsotsi
Updated 3 hours ago State-owned electricity producer Eskom announced in the early hours of Tuesday morning that Zola Tsotsi had agreed to step down as a director and chairperson of the board and that Dr Ben Ngubane had been appointed acting chairperson. In a statement the utility...
More
 
 
Recent Research Reports
Steel 2015: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2015 report provides an overview of the key developments in the global steel industry and particularly of South Africa’s steel sector over the past year, including details of production and consumption, as well as the country's primary carbon...
Projects in Progress 2015 - First Edition (PDF Report)
In fact, this edition of Creamer Media’s Projects in Progress 2015 supplement tracks developments taking place under the Renewable Energy Independent Power Producer Procurement Programme, which has had four bidding rounds. It appears to remain a shining light on the...
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
 
 
 
 
 
This Week's Magazine
Projected capital expenditure (capex) in the South African automotive assembly industry should reach a record R7.48-billion this year, says the National Association of Automobile Manufacturers of South Africa (Naamsa) in its 2014 fourth quarter business review. Capex...
After several years of navigating project-threatening red tape and currency fluctuations, the 4.4 MW Bronkhorstspruit biogas power plant, which will supply clean energy to a leading automotive manufacturer in Gauteng, is expected to enter production before June....
RESOURCEFUL The raw material for the pilot plant would be supplied from the dissolving wood pulp plants at Sappi’s Saiccor and Ngodwana mills, in South Africa, and the Cloquet mill, in the US
South African paper and pulp producer Sappi reported earlier this month that it would build a pilot plant for the production of low-cost Cellulose NanoFibrils, or CNF (nanocellulose) at the Brightlands Chemelot Campus in Sittard-Geleen in the Netherlands.
The long-term outlook for Nigeria is a country that has the potential to be very strong. So affirmed International Monetary Fund (IMF) Nigeria Mission Chief and Senior Resident Representative Dr Gene Leon on recently. "But we are starting from a point of huge...
Poor infrastructure planning and inadequate maintenance are becoming increasingly problematic for new developments and the associated infrastructure required to support such developments. In many urban and rural municipalities, the state of infrastructure has been...
 
 
 
 
 
 
 
 
 
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 $96 Close
Subscribe Now for $96