2-1
2
Vac Sensor Installation
Overview
A simplified Veeder-Root vacuum sensor installation in an STP containment sump is shown in Figure 2-1. Vac
Sensor (VS) and Vac Float (VF) modules are assembled in a housing which is shown in Figure 2-2. A separate
mounting bracket (see Figure 2-2) is easily attached to the STP riser to support the Vac Sensor housing.
Approximately 12 inches (304.8mm) of clearance is required below the pump manifold for the Vac Sensor
components. Final vacuum connections are made once the housing and bracket are in place. A 1/4” NPT port into
the interstitial space of the double-wall vapor return line, double-wall product line, and/or double-wall containment
sump must be accessible in the containment sump. For installations requiring tank interstice monitoring, a riser
must be in the same containment sump for the tank interstitial sensor. Field wiring connections of the Vac Sensor
components are sealed in a customer supplied containment sump junction box (JB).
Figure 2-1.- Installation Example Of Four Vac Sensor W/Tank Interstitial Monitoring
Use only the materials specified in this manual during installation. Use of any other mate-
rials or lubricants may damage the SCVS system and will void warranty. Lubricate fittings
only with soapy water - do not use any other material.
Product line
vacuum fitting
Vapor return line
vacuum fitting
Double wall sump vacuum
fitting (If multiple ports are
provided in the sump wall,
install vacuum fitting in
lowest one.
Double wall tank
To console
Seal off
Tank interstitial
vacuum fittings
Four Vac Sensor
Housing Assembly
bracketed to riser
STP
Wiring from sensor in
tank interstice connects
to vac sensor in J box
Barbed fitting in siphon
port for vacuum source
Dual weatherproof junction
boxes w/cord grip wiring
entries containing epoxy
sealed connections
CAUTION
