Testing methods for float-type liquid level switches
Testing methods for float-type liquid level switches
(OP)
Hello all,
Was wondering if anyone could share their inspection practices for mechanical float-type liquid level switches.
We have some tanks fitted with a chain that can be used to pull the float up and test the signal, but there are concerns that the mechanical linkage may not go back to the proper position; also concern that if the float itself had a hole or crack, the liquid would fill it up and it wouldn't float.
We have discussed 'wet testing' by removing the entire assembly and floating in a pail of product to ensure it displaces, but that is a pain and safety concerns about doing this on top of a tank.
Primary concern is for liquid petroluem vertical storage tank applications.
Any thoughts / ideas / best practices out there? Thanks,
Was wondering if anyone could share their inspection practices for mechanical float-type liquid level switches.
We have some tanks fitted with a chain that can be used to pull the float up and test the signal, but there are concerns that the mechanical linkage may not go back to the proper position; also concern that if the float itself had a hole or crack, the liquid would fill it up and it wouldn't float.
We have discussed 'wet testing' by removing the entire assembly and floating in a pail of product to ensure it displaces, but that is a pain and safety concerns about doing this on top of a tank.
Primary concern is for liquid petroluem vertical storage tank applications.
Any thoughts / ideas / best practices out there? Thanks,





RE: Testing methods for float-type liquid level switches
RE: Testing methods for float-type liquid level switches
Also, considering the very low cost of float switches, put in as many redundant ones as you think you need to feel comfortable -- depending on how critical the process is.
Good on ya,
Goober Dave
RE: Testing methods for float-type liquid level switches
Are you sure it's a float, not a displacer?
Roy