User's Manual

MTU Instruction
for Sensus and Invensys Water Meters
Purpose & Scope
This instruction provides wiring information for use in connecting a STAR MTU to Sensus
and/or Invensys water meters (all sizes) equipped with ECR or ICE registers.
ECR or ICE
MTU Cable
Sensus/Invensys
Register
Red R (Red)
Black B (Black)
White G (Green)
Supplies and Tools Required
See Publication 471-2000, General
Installation and Wiring Guidelines for a
complete list of recommended tools and
supplies for MTU Installation.
Application Notes
• The 8-digit Sensus ICE Register must
be programmed to deliver 6
consecutive digits of reading
information for proper operation with
STAR MTUs.
Installation Procedure
Step 1 - Select a mounting location for
the MTU that will allow optimum signal
transmission, and install any needed
wiring. Be sure to follow all General
Installation and Wiring Guidelines as
outlined in Publication 471-2000.
Step 2 – Select the wiring diagram that
applies to the meter you are connecting
and make the appropriate wiring
connections.
a. Direct Wiring to Meter - MTU
wiring is supplied stripped to a
standard length that fits water
meters with screw terminals.
Simply wrap the wires around the
screw terminal and tighten the
screw. It is recommended that the
screws be tightened to no more
than 4 – 5 in-lbs. Overtightening
the screw can stress and possibly
fracture the wire.
b. Water Meter with Integral Cable -
If the water meter is supplied with
an integral cable and a cable-to-
cable splice is necessary, use a
gel-filled wire splice designed for
outdoor (moisture applications) to
seal the individual connections.
Note: When connecting a dual port MTU
to a compound meter, connect port 1
(black jacket) to the primary, or high-flow
register and port 2 (grey jacket) to the
secondary or low-flow register.
471-2011 - 2/28/2006
Page 59