2-9
2 Vac Sensor Installation Vacuum Connections within Containment Sump
Figure 2-11.- Example Tank Interstitial Sensor Riser Cap Connections - Steel And Fiberglass Tanks
VACUUM CONNECTIONS TO A DOUBLE-WALL FIBERGLASS TANK
1. Get the tank’s interstitial riser cap, interstitial sensor, cord grip components, 3-way ball valve, 1/4” NPT close
nipple, 1/4” NPT/barbed adapter fitting, spring clamps, and relief valve from the kit.
2. Assemble the cord grip components and apply sealant onto its threads. Screw it into one of the 1/2” NPT
holes in the cap.
3. Install the fiberglass tank interstitial sensor into the tank riser following the instructions accompanying the
sensor (manual P/N 576013-617). Once installed, push the end of the sensor’s cable through the loosened
cord grip in the cap - being careful not to alter the sensor’s position. Apply an adequate amount of sealant to
the threads of the riser pipe and screw on the cap until tight. Tighten the cable cord grip.
4. Apply sealant onto the threads of one end of the nipple and screw it into the 1/4” NPT port in the cap. Apply
sealant to the other end of the nipple and screw on the 3-way ball valve. Apply sealant to the threaded end of
the barbed adapter and screw it into the side port of the 3-way ball valve. (see Figure 2-11).
5. Apply sealant onto the threads of the relief valve and screw it into the other 1/2” NPT hole in the cap.
You must install the relief valve in the fiberglass tank riser cap or damage to the tank may
occur!
6. Measure a length of 1/4” ID tubing to connect the VAC TEST port (ref. Figure 12) on the Vac Sensor labeled
‘T’ to the tank’s interstitial 3-way ball valve. Plan enough tubing to avoid sharp bends in it or stretching it. Cut
and install this tubing and secure tubing ends with spring clamps.
7. The Vac Sensor labeled ‘T’, and which is connected to the 3-way ball valve in the tank interstice riser cap, must
be wired together with the tank interstice liquid sensor in the junction box. Locate the ends of the Vac Sensor
cable labeled ‘T’ and the tank interstitial liquid sensor cable, tape them together, and tag them ‘Tank Vac
Sensor’.
Relief valve
(1/2" NPT)
1/4" NPT close nipple
Sensor cable
to junction box
Cord grip
Riser cap
FIBERGLASS TANK
Sensor cable
to junction box
1/4" ID tubing
to Vac Sensor
Cord grip
Riser cap
STEEL TANK
1/4" NPT
close nipple
3-way ball
valve
3-way ball
valve
1/4" NPT
barbed fitting
Spring clamp
F
LOW
1/4" ID tubing
to Vac Sensor
1/4" NPT
barbed fitting
Spring clamp
F
L
O
W
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