Pulse Input to the MTEK6000, Wall and Pipe Mounting

MTEK6000 SERIES USER'S MANUAL

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.

January 2002

2-5