MSR Magmeter
Magnum is supplied with a power pack (110VAC - 12VDC Plug-in class 2 transformer. UL and CSA listed, 81J1 E81356). The electrical supply to the transmitter should NOT be grounded under any circumstances.

Ideally the only ground the probe should be connected to is the grounding through contact of the sensor body with the liquid.

Since there are potential differences between the different grounds provided by earth, electrical and pipe ground, that could interfere with Magnum, all other grounding of the probe and transmitter should be avoided.