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Engineering Reference Materials for Ph Schematic
  • Making accurate pH measurements

    In this article, we will tie the analogy of. accurate time to pH measurement and show how to make more accurate,. dependable and believable pH measurements by using three pH sensors.

  • pH Meters and ORP Meters

    pH meters and ORP meters are used to measure or monitor potential of hydrogen (pH) and oxidation-reduction potential (ORP). pH is the negative logarithm of the hydrogen ion activity in solution. The pH value of a substance is directly related to the ratio of the hydrogen ion [H+] and the hydroxyl

  • pH Tech Tips (.pdf)

    The Concentration ratio of hydrogen ions (H+) and hydroxyl ions (OH-) determine the pH value of a solution. Any hydrogen activity will produce a 59.16 mV/ pH unit across the glass membrane. The measurement is expressed on a scale of 0.0 to 14.0. Water with a pH of 7 is considered neutral (H+ ions

  • Carbon Dioxide for pH Control

    is safe to handle, easy to apply, efficient and ecologically safe. When pH control is critical to your process or effluent quality, CO2 can be a most viable alternative.

  • The pH Factor: Why Measure (.pdf)

    Often, the first question asked regarding measurement and control of pH is "What exactly is pH anyhow?" The "p" in pH is actually a mathematical symbol for the negative logarithm, and the "H" represents the element Hydrogen.

  • Guide to Minimizing User Errors in pH Measurements

    Over one hundred different compositions available from many different manufacturers None exhibit completely linear pH response in overall pH range specified Maximum available pH range: -2 to 16 pH in aqueous solutions Optimum, linear pH range: typically 2 pH units less specified minimum and maximum

Discussions about Ph Schematic
  • Re: Elevator control circuit

    I need a schematic diagram of a 5-floor elevator, please help me sir! my email add is ajmguinahan@yahoo.com.ph...

  • Re: PA Mixer/Amp PCB Schematic

    My son is constantly tearing down and repairing mixers, amps, and whatever. He hardly ever replaces entire boards but sometimes it is necessary. No reason you can't just replace the capacitors if you can identify them. If not try searching online for places that sell the schematics. perhaps thi...

  • Re: Single Phase 240 Volts to 3 Phase 240 Volts

    Here you go. Miller 3 ph converter design. All you need to know about making a good reliable and stable phase converter of your own. I am the same guy there as here so I know the design works well!

  • Re: Converting 3 Phase to 1 Phase in Reverse?

    Thanks for the PM you sent me. I will try and work up some better details as I have time. Fist thingiI would suggest is looking fore schematics for 9 lead and 12 lead dual voltage three phase motors then read up on what a zig zag or 'Z" connection is regarding getting single phase form three phase.

  • Dover Elevator - Hydraulic Pump Shuts Off

    I have a Dover elevator single story 480 3 ph. On energizing, the hydraulic pump runs for about a minute and then shuts off. I have very limited schematics but I do see a pit safety switch in series with a power supply that could keep everything from working. Nothing is working but I have good power...

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News about Ph Schematic
  • Bioeroding Organisms ''Tearing Down'' Coral Reefs | Video

    Lower ocean pH levels are impairing coral skeleton growth, making it easier for mollusks, worms and sponges to do some serious damage.

  • 4017 & 555 Police LED Lights Project (noob question)

    hello, i am assigned to create a physical project starting from the schematics on the left side. my teacher told me that the schematic is incomplete, so the first step is to corect it and then use pads and then send the gerber files to a company to create it. i started reserching it and every schem

  • Genome-wide transcriptional analysis suggests hydrogenase- and nitrogenase-mediated hydrogen production in Clostridium butyricum CWBI 1009

    Background: Molecular hydrogen, given its pollution-free combustion, has great potential to replace fossil fuels in future transportation and energy production. However, current industrial hydrogen production processes, such as steam reforming of methane, contribute significantly to the greenhouse effect. Therefore alternative methods, in particular the use of fermentative microorganisms, have attracted scientific interest in recent years. However the low overall yield obtained is a major challenge in biological H2 production. Thus, a thorough and detailed understanding of the relationships between genome content, gene expression patterns, pathway utilisation and metabolite synthesis is required to optimise the yield of biohydrogen production pathways. Results: In this study transcriptomic and proteomic analyses of the hydrogen-producing bacterium Clostridium butyricum CWBI 1009 were carried out to provide a biomolecular overview of the changes that occur when the metabolism shifts to H2 production. The growth, H2-production, and glucose-fermentation profiles were monitored in 20?L batch bioreactors under unregulated-pH and fixed-pH conditions (pH 7.3 and 5.2). Conspicuous differences were observed in the bioreactor performances and cellular metabolisms for all the tested metabolites, and they were pH dependent. During unregulated-pH glucose fermentation increased H2 production was associated with concurrent strong up-regulation of the nitrogenase coding genes. However, no such concurrent up-regulation of the [FeFe] hydrogenase genes was observed. During the fixed pH?5.2 fermentation, by contrast, the expression levels for the [FeFe] hydrogenase coding genes were higher than during the unregulated-pH fermentation, while the nitrogenase transcripts were less abundant. The overall results suggest, for the first time, that environmental factors may determine whether H2 production in C. butyricum CWBI 1009 is mediated by the hydrogenases and/or the nitrogenase. Conclusions: This work, contributing to the field of dark fermentative hydrogen production, provides a multidisciplinary approach for the investigation of the processes involved in the molecular H2 metabolism of clostridia. In addition, it lays the groundwork for further optimisation of biohydrogen production pathways based on genetic engineering techniques.

  • High titer and yield ethanol production from undetoxified whole slurry of Douglas-fir forest residue using pH profiling in SPORL

    Background: Forest residue is one of the most cost-effective feedstock for biofuel production. It has relatively high bulk density and can be harvested year round, advantageous for reducing transportation cost and eliminating onsite storage. However, forest residues, especially those from softwood species, are highly recalcitrant to biochemical conversion. A severe pretreatment for removing this recalcitrance can result in increased sugar degradation to inhibitors and hence cause difficulties in fermentation at high solid loadings. Here, we presented high titer ethanol production from Douglas-fir forest residue without detoxification. The strong recalcitrance of the Douglas-fir residue was removed by sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL). Sugar degradation to inhibitors was substantially reduced using a novel approach of ?pH profiling? by delaying acid application in pretreatment, which facilitated the simultaneous enzymatic saccharification and fermentation of undetoxified whole slurry at solid loading of 21%. Results: ?pH profiling? reduced furan production by approximately 70% in using SPORL pretreating Douglas-fir forest residue (FS-10) comparing with the control run while without sacrificing enzymatic saccharification of the resultant substrate. pH profiling also reduced carbohydrate degradation. The improved carbohydrate yield in pretreated solids and reduced fermentation inhibitors with pH profiling resulted in a terminal ethanol titer of 48.9???1.4?g/L and yield of 297???9?L/tonne FS-10, which are substantially higher, i.e., by 27% in titer and by 38% in yield, than those of a control SPORL run without pH profiling. Conclusions: Economical and large-volume production of commodity biofuels requires the utilization of feedstocks with low value (therefore low cost) and sustainably producible in large quantities, such as forest residues. However, most existing pretreatment technologies cannot remove the strong recalcitrance of forest residues to produce practically fermentable high titer sugars. Here, we demonstrated a commercially scalable and efficient technology capable of removing the strong recalcitrant nature of forest residues using ?pH profiling? together with ?low temperature SPORL?. The resultant pretreated whole slurry of a Douglas-fir forest residue using this technology can be easily processed at high solids of 21% without detoxification to achieve a high ethanol yield of 297?L/tonne at 48.9?g/L.Graphical AbstractGraphic table of content.

  • Coral records of reef-water pH across the central Great Barrier Reef, Australia: assessing the influence of river runoff on inshore reefs

    Coral records of reef-water pH across the central Great Barrier Reef, Australia: assessing the influence of river runoff on inshore reefsBiogeosciences, 12, 1223-1236, 2015Author(s): J. P. D''Olivo, M. T. McCulloch, S. M. Eggins, and J. TrotterThe boron isotopic (δ11Bcarb) compositions of long-lived Porites coral are used to reconstruct reef-water pH across the central Great Barrier Reef (GBR) and assess the impact of river runoff on inshore reefs. For the period from 1940 to 2009, corals from both inner- and mid-shelf sites exhibit the same overall decrease in δ11Bcarb of 0.086 ? 0.033‰ per decade, equivalent to a decline in seawater pH (pHsw) of ~0.017 ? 0.007 pH units per decade. This decline is consistent with the long-term effects of ocean acidification based on estimates of CO2 uptake by surface waters due to rising atmospheric levels. We also find that, compared to the mid-shelf corals, the δ11Bcarb compositions of inner-shelf corals subject to river discharge events have higher and more variable values, and hence higher inferred pHsw values. These higher δ11Bcarb values of inner-shelf corals are particularly evident during wet years, despite river waters having lower pH. The main effect of river discharge on reef-water carbonate chemistry thus appears to be from reduced aragonite saturation state and higher nutrients driving increased phytoplankton productivity, resulting in the drawdown of pCO2 and increase in pHsw. Increased primary production therefore has the potential to counter the more transient effects of low-pH river water (pHrw) discharged into near-shore environments. Importantly, however, inshore reefs also show a consistent pattern of sharply declining coral growth that coincides with periods of high river discharge. This occurs despite these reefs having higher pHsw, demonstrating the overriding importance of local reef-water quality and reduced aragonite saturation state on coral reef health.

Product Announcements for Ph Schematic
Sartorius Group
pH Combination Electrodes

pH combination electrodes and glass membrane electrodes. All pH combination electrodes have an Ag/AgCl reference. The electrodes are supplied with a permanently attached cord and BNC connector, electrodes with a built-in temperature sensor (NTC 10 kOhm) additionally have a 2.5 mm phone plug. All models are optionally available with DocuClip. Contact Us for product requests.

913 pH Meter

The 913 pH Meter is an easy-to-use measuring instrument for routine operation in the laboratory and on the road. pH or mV and temperature can be measured in parallel with one analog and one intelligent sensor and output to a large colour display. Important information such as charge state, quality of the calibration, calibration interval, etc. can also be clearly viewed at a glance. A PIN-protected expert mode protects the instrument against unintentional changes of different parameters...

Hach Company
pH Ultra Probe

Hach's pH Ultra Probe has the fastest stabilization, even in difficult measurement samples. There is also no need to question if the probe has stabilized, because it locks in as soon as stabilization is complete. Try an online demo and see how this feature can help you. HQd ™ meters and probes are a customized solution for water quality testing. Designed specifically for water applications, the probes are available in a wide variety of parameters. They are compatible and fully...