Flange Location for Level Transmitter

Basically you can measure the level using different types of detectors.

It should be opportune if you have chosen your type, to inform us about it.

You could e.g. install a pressure transmitter at the bottom of the tank and calibrate the reading in % or even gallons or liters. (not really the lowest point if solids are present that can clog up the sensor),

A simple visual system can be a transparent hose or pipe at the outside, next to the tank (with a shut- off emergency valve) from the bottom opening, to the top.(communicating? vessels? principle)

Different systems will work on top detection- reflection or floating devices, coupled to a linear measuring device. These are mostly top mounted.

Thanks for prompt response.Hope the nipple can be installed above the pump suction nozzle at 30 deg to it.

Be well aware that when the pump is working, your measurement will be influenced by the suction effect and turbulences.

Put your detector as far from it as possible.

We are using an ultra sonic detector on our tank (similar size) and it works great. In our tank there is constant foaming and turbulance, look into it you will not be disappointed, I wasn't.

Taz

You dont mention the shape of the tank bottom. Nevertheless, you could put the nipple/flange for a good pressure sensing device at the point where your tank changes shape, ie the conical bottom start. To calibrate you simply calculate the volume of the cone, or other bottom, and add it to the final volume which will be displayed (typically) remotely. If one knows the flow of the outlet pump, one can set the pump run timer to stop the pump before the tank runs empty, if that need to be done. Otherwise a simple level switch as a cutoff will suffice. One can put this transmitter at the bottom in the line to the pump, but inaccuracies may result due to pump suction. However if you only take measurements when the pump is not working, there can be no problems with inaccuracy. Of course you may have a very good transmitter where you may set it up to calculate the level at set intervals and determine the actual from this.

Contact the instrument manufacturer directly for advice.

Thank you

Well, i think you can use either of the level measuring transmitter available in markets, as one mentioned to be attached at the bottom to meaure the pressure. if you just need to meaure the length, you can either use level trall or float type scaled level indicators, FLoat system is for indication, but for the transmission, you wither have to use, the DP transmitter.. or ultra sonic, or others available.

Guided Wave Radar will work fine (especially for 2 level surfaces, i.e. Level + Interface level) due to foam presense, manufacturers are numerous.

As to bottom mount pressure/level transmitter, I'd recommend to choose Sanitary type with screwed connection, as it's easy to remove and clean out (if you talk about food application). Install it at lower edge of the discharge (off-load) pipeline, as you have no access to the material below that point. Another thing is to position the transmitter at 90 deg to supply pipeline - to minimize head flow effect when loading the tank with material, as mentioned already. Transmitter accuracy may vary from 0,5 to 0,02% URV depend on what you need. Also, if you tank is under pressure - you will need to run a dry leg (or have a remote seal) to compensate for that pressure. Keep it heated in order to prevent condensation in that leg then.