These are meant to do that. The calibration of the Sonic, before pairing it, is by referring to a chart for the depth of the tank and moving dip-switches on the remote receiver to suit. It then reads on ten percent bar scale. The sender presumably works without external power somehow and is ultrasonic or something. There is a mechanical gauge also fitted to this tank but not the other, possibly because the receiver may be remotely situated while the gauge gives the actual user a reading.
No, there's another cylindrical float-like device hanging down to about a quarter height between the tanks to do that. This thing is connected by a short tube to the sender/sensor thing screwed into the to of the inner tank
No mention of that for the green ones in my literature. There is on the red ones. Not sure on that but there is no mention about a battery or access to one on the green units
No told her I wasn't changing them if she didn't like it close her book and might as well go save us both time turned a blind eye
Here is a video of the small tank's unit. Note the nipple on the side of the green unit which is not connected to anything on this unit but when fitted to the bigger tank with the Uni system this has a stiff plastic tube, about six inches long, fitted and connected to the 4-20mA pressure sensor, which in turn is wired to the Sonic Uni unit.
I reserve judgement on how well they work until they are connected to the electricity and there is diesel in the tanks. I'll order some red diesel first thing tomorrow. I've 500l of DERV in the IBC that I'll gravity feed into the smaller tank tomorrow morning.
Power tube?
No. I suspect, now that I've found out what I think the limpet mine is [a 4-20mA pressure sensor], that it is just a way of transferring the 'pressure' from the sender to it, from where it is converted into an electrical signal that travels through the cable to the WM Uni receiver unit.
dunravensystems.com
+1 on that, have one here 7 years, it's a good jobGet one of these, you can read the level on the sensor, or in the house/office,and comes with a bund leakage sensor as well.Apollo Visual Bunded - Dunraven Systems
Dunraven Systems LTD - Experts in oil monitoring solutions with over 40 years experience in the industry.
There are more basic ones without the bund sensor if you want those.
Why? I haven't even got the purchased systems working yet. I just want to know how they work not change them for alternatives.Get one of these, you can read the level on the sensor, or in the house/office,and comes with a bund leakage sensor as well.Apollo Visual Bunded - Dunraven Systems
Dunraven Systems LTD - Experts in oil monitoring solutions with over 40 years experience in the industry.
There are more basic ones without the bund sensor if you want those.
I don't think either are the 'wrong' way. Both ways are clearly shown in the literature, including using the more sophisticated unit in the same way as the cheaper Sonic but instead of pairing by holding the receiver and sender together for 20 seconds, the sender has a magnet held against its dot, which seems to allow pairing from at least two meters apart. It's all very sophisticated and I wish I knew what principles are involved. I like to know how things work, in principle if not in every detail.