User's Manual

MTU Instruction
for Neptune and Schlumberger Water Meters
• Alarm Polling – The NTG MTU
also automatically polls (reads) the
E-Coder alarm indicators every 15
minutes. This happens
automatically, independently of the
standard read interval mentioned
above. If the NTG MTU detects
any change in the alarm status
of the E-Coder Plus register, an
alarm transmission is generated
immediately, reporting the change
in alarm status to the DCUs.
Compatibility with Neptune
E-Coder Registers
Hexagram’s NTG MTU is compatible with
Neptune E-Coder Plus solid state
registers revision 05.98 or higher.
Checking E-Coder Revision
Level
To check the revision level of an E-Coder
register, use your hand to block all light
from striking the E-Coder’s solar cell for
approximately 20 seconds. Then,
remove your hand allowing light to strike
the solar cell. The E-Coder’s display will
briefly flash all 8s, and then reveal a
display like that shown below.
The four digit number at the right of the
display is the revision level. In the
illustration above, the revision level
shown is 05.98.
Compatibility with Neptune
ARB-V and ProRead
Registers
Upon initial installation, an NTG MTU can
also be used with meters equipped with
Neptune’s ARB-V or ProRead registers.
These are standard absolute encoder
registers without the advanced
capabilities of the E-Coder register.
When used with ARB-V or ProRead
registers, the NTG MTU operates in
standard mode, providing 6-digit readings
and no specialized alarm polling.
Note: Auto/ProRead registers must be
programmed by the manufacturer for 3-
wire mode.
It is important to note that once an NTG
MTU is programmed to function in the
advanced mode with an E-Coder register,
it can no longer be returned to standard
operation. To caution the user, the
display shown below will appear when
first programming an NTG MTU for use
with an E-Coder:
CAUTION!
Once an NTG MTU is
programmed for use with an
E-Coder it can no longer be
used with other (non-E-Coder)
registers.
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