Compaq MTEK6000 - Manual (Page 15)

MTEK6000 SERIES USER'S MANUAL
January 2002 2-5
PULSE INPUT TO THE MTEK6000
Magnetically operated reed switches inside
the meter drive assembly send electronic
pulses as the drive turns. These pulses
represent uncorrected meter volume to the
instrument.
To eliminate false counts that can result from
the reed switch "bounce”, the MTEK6000
uses a set/reset, dual-reed switch
configuration. An input pulse is generated
only when the opening and closing of the
first switch is followed by the opening and
closing of the second switch. The main
counter input is also monitored for fault
conditions. When enabled, if any of the dual-
reed switches should be defective, the input
pulses will automatically switch to the
working counter input and the MTEK6000
will generate a Faulty Counter alarm. This
function is enabled if the Counter Fault
Monitoring parameter is set to 1 and
disabled if set to 0. The default value is 0 for
disable. See Appendix A for addressing.
For units supplied with indexes, the main
counter input is terminated at the UNIT
(BLK) MTA connector and the uncorrected
pulse wiring at the FIELD (WHT) MTA
connector at the lower right hand corner of
the corrector printed circuit assembly.
Metretek, Inc. can supply a remote index
similar to the main index or a sandwich
pulser for wall or pipe mount installations.
When the sandwich or external pulser option
(1, 10, 20, or 50 pulse per revolution) is
supplied, connect the N.O., COM, and N.C.
wiring to terminals 32 (SET1), 33 (GND) and
34 (RST1) respectively.
The pulse input is software selectable for
Form C (three-wire) or Form A (two-wire)
connection.
Software is used to configure the pulse input.
The optional, external keypad / display can
also be used to configure the pulse input and
other parameters. See Appendix A for
addressing.
WALL AND PIPE MOUNTING
The MTEK6000 can also mount directly on a
wall or on a pipe. Mounting feet are provided
for wall mounting. See Figure 2-5.
For pipe mounting, approximately 10 feet of
2-inch rigid iron pipe or conduit is required.
The pipe should be installed 18 to 24 inches in
the ground in 6 inches wide concrete. The
length of the 2-inch mounting pipe or conduit
will vary according to the site, but typical
installations place the MTEK6000 at about
eye level for ease of operation. Mounting
plates are provided for pipe mounting. Secure
the MTEK6000 to the pipe with the provided
U-bolts, washers and hex nuts. See
Figure 2-6.