Liquid Controls Differential Pressure Transducer - Manual (Page 7)

7
MechanIcal InstallatIon
correct orientations
Incorrect orientations
to install the ∆P Transducer: (cont.)
4. Mount the differential pressure transducer.
Inlet and outlet fittings of the differential pressure transducer are ¼”-18
NPT, female threads.
4a. Position the differential pressure transducer in an
upright orientation.
Regardless of the tubing used for the differential pressure
transducer connections, the transducer should be mounted upright
with the pressure impulse piping horizontal to the fittings as shown
to the right. The transducer may be located above or below the full
flow fuel monitor.
4b. Position the differential pressure transducer correctly
according to flow direction.
The differential pressure transducer fittings are marked with a “+”
sign and a “-” sign to indicate upstream and downstream pressure.
Ensure that the “+” sign is oriented so that it is connected to the
upstream pressure side tubing and the “-” sign is connected to the
downstream pressure side tubing. If it is reversed, this will result in
a negative reading of the differential pressure.
5. Fill the tube connections from the full flow fuel monitor
and the differential pressure transducer with fluid.
With the system pressurized, carefully loosen the connection on the
inlet side of the differential pressure transducer without removing
it completely. Once fluid appears, tighten the fitting. Repeat this
procedure for the outlet side.
6. Route the differential pressure transducer cable to the
LectroCount register. Register wiring instructions are on
the following page.
If this is a new installation and the differential pressure transducer
is already wired to the LectroCount register, proceed the differential
pressure shutdown circuit wiring instructions.
The tube connections from the full flow fuel monitor and the
differential pressure transducer must be filled with fluid for
the transducer to function properly.