10
Probe Installation
Probe Manhole Installation
At each underground probe location, install a 14-inch (355 mm) minimum diameter approved manhole according
to the manufacturer’s instructions (Note: probes should be located at least 24 inches (610 mm) from the
submersible pump to avoid erroneous probe readings when the pump is running). Position the manhole so that
there is necessary clearance for junction box installation and wiring.
Determining Mag Probe Length for Installation in a Dedicated Riser
1. Measure the distance from the bottom of the tank to the top of the probe manway - this is the minimum probe
length (ref. Figure 6).
2. The probe canister must be within the riser pipe (minimum length of 10 inches [254mm]).
Figure 6. Determining the Minimum Mag Probe Length
Probe Installation
1. Turn OFF power to the console.
2. Remove any sludge from the bottom of the tank.
3. Check that floats, boot, and cable are assembled correctly on probe (ref. Mag Probe Assembly Manual).
4. Gently slide the float(s) to the bottom of the probe shaft before raising the probe. Carefully lower the probe into
the riser pipe until the boot rests on the bottom of the tank [See Figure 7 for UST installation or Figure 8 for
AST installation].
Top of probe
manway
Tank
Minimum
Probe length
STP manway
probes\probemeasurement.eps
24" ( 610 mm) min.
3" (76mm) min. clearance from
top of canister to top of riser
Probe canister
must
be within riser pipe
Manway cover
10" (254mm) minimum
riser length
