OPW M2010-EU, Installation Manual

Page: 37 / 149

You can keep the cap off of the assembly until after the probe as been put in the tank and riser.
5.3.2 Manhole and Junction Box
NOTE: The section that follows is applicable to the OPW-FMS 924B junction box installation.
For information on DMP probe installation with an IP68 junction box see "Dover
Magnetostrictive Probe (DMP)" on page 53.
Install a manhole of at least 45.7 cm (18 inches) diameter around an unused fitting in the top of the tank. This
manhole must be of sufficient dimensions to contain the riser for the probe and a weatherproof junction box.
NOTE:
The 924B probe cable (OPW P/N 10-1185) is 6 feet (1.83 M) in length. Make sure
there is sufficient length of cable from the probe to where a weatherproof junction box is to be
installed.
The weatherproof junction box must be of sufficient dimensions to contain a 0.5 inch (12.7 mm) conduit, a
minimum 12 inches (30.5 cm) coiled field wiring, all applicable probe and sensor cables and an epoxy resin
seal-pack.
Install a 1/2-inch NPT bushing in the weatherproof junction box for the conduit.
WARNING: Seal-offs are required any time I.S. wiring enters conduit.
Install one conduit seal fitting in the manhole where the conduit leaves the
junction box and one in the building before the conduit goes into the console.
See the Conduit Seal Fittings for Cables section that follows for more
information.
Doc. No.: M2010-EU Rev.: 13
Page 37 of 149