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Hi I work with PLC and SCADA applications. Reacently we have been looking at monitoring our systems remotely, changing and monitoring variables via SMS, remote access to HMI etc. I have been thinking strongly about making a web page that would allow me to display and alter variables from any...

Just had an after thought there and another look at the results. It seems that it isnt always the same phase current that is different than the other 3. Could it be that the power meter is taking a very quick sample each minute and is capturing instantaneous current on the wave form as they rise...

Hello again. Ok, have been monitoring a number of parameters from my smart power meter now for over a week. The meter applies a CT to each of the incomming 3 phases and a connection to each phases voltage. While on site the current that we were seeing on the power meter was the same as the...

Ok, have a better understanding of whats involved now. Thanks for the help. Justin

Hi We are in the process of designing a septicity dosing system for a waste water pumping station to reduce the H2S04 further up the rising main, we are planning to dose with Nutriox (calcium nitrate) From looking at existing systems I can see that the inputs to the system are mainly the level...

Ah so the KVAr is measured to be able to work out an average (if not totally accurate) power factor for the month that can be used to check if the power factor is within limits? From what I can see tho, I have either an option of a unit that provides KWHr information OR KVArHr. Surely this isnt...

Thanks I have tried getting information from the supply company but am still waiting for someone from the industrial pricing section to get back to me. I have a smart power meter in at the moment (Socomec Diris A40) that Im extracting information on KVArH via modbus. Im presuming this is KVA...

Hi Im involved in a project where I am setting up a system to remotely monitor the energy consumed by a industrial plant with a number of motors, pumps etc. Im in Ireland. I have gotten to the stage where I can send a CSV file each hour that lists the instantaneous KW, KVA, KVAR, power factor...

Thanks Skogsgurra When I posted the above I only had the brochure for the drive which stated 400V. I was a little worried that if I was installing on a site that the voltage may be 415 or 420, would this affect the operation of the drive and subsequently the pump motor. I have since found the...

Hi I have come across Yaskawa J1000 family of inverters and am considering purchasing one to control a pump on a variable frequency. I have read a few posts in this forum where the voltage used was slightly different to the rating of the inverted and this led to over excitation and tripping...

Hi Is there a calculator or rule of thumb to use for selecting start and run capacitors for single phase inductance motors if i know the supply voltage and current ratings for the motor. I normally refer back to the manufacturer but was hoping for an alternative method. Justin

The filter uses ultra filtration but the main point about it is the trans pressure across it and the flow rate required through it via the pump. ie 0.2 bar across it and 70 l/hour through it

The filter is in the botton of the sump. The pump sucks the water from the sump through the filter so it has to lift the water from the pump a distance of 1.5 metres and the trans filter pressure is 0.2 bar resulting in another 2 metres to the suction head (3.5 metres in total), 4 metres with a...

Hello Im searching for a pump for lifting water from a sump through a filter. The max distance to lift is 1.5 metres and the filter requires another 0.2 bar of suction. I require a pump with suction head of 4 metres but the flow rate must be kept at 70 l/hour. Does anyone have any...

Thanks! danw2, what kind of money would i be looking at for the probe LU? justin

Hi does any one know of a competitively priced Ultrasonic level sensor that will provide a 4-20mA, 0-5v or 0-10v output for use in a PLC? The sensor application is for waste water and will be used on sump tanks of max depth 10 metres. Thanks Justint

Pooslinger, Do you have the model and serial number of the pressure transducer you used for under $100 as i am having difficulty finding one that cheap. Thanks Justint

Thanks JLSeagull I was wanting to stick with a conductive based probe as opposed to capacitive as we use conductive at present and our recieving equipment is based on such. The majority of conductive probes on offer are based on 2 or more probes from a single head that swicth the conductive...

Hi Has anyone ever heard of a conductive level probe that is based on one probe only with incremental pairs of contacts at levels along the probe? I know such a device exists but any search string results in probes with 2 or more electrodes or pendular probes. Any help appreciated Justin Trainor