Multiplex systems are ideal for managing and monitoring the daily flow of wastewater in larger commercial and industrial systems. These controls contain many of the same features found in the simplex and duplex systems, but are typically microprocessor-controlled to allow for greater flexibility.
- Components may be taken out of service with mechanical toggle switches without affecting the sequence.
- Pump and zone valve fail circuits allow for easy detection and alarm of failed equipment.
- The space-saving microprocessor-based control utilizes a door-mounted HMI for user-friendly setup and data collection.
- Standard programs can be customized to meet specific applications.
Multiplex Equalization Controls
This series of controls are typically used on larger or multiple zoned systems when longer cycles and time of day pump events are desired. They are designed to provide flow equalization and are ideal for providing an alarm condition for excess wastewater flow. The standard “MET” time of day (“T” series) timed dose panels are configured with a 24-hour time clock and pump run timer for each pump for selective interval dosing or for evenly spaced timed dosing. Time enabled dosing can occur as frequently as every half-hour in 15-minute increments or as infrequently as once every 24 hours. The control will allow a pump or valve to be taken out of service without interfering with the operation of the other zones or creating nuisance alarm conditions.
Multiplex Timed Dose-On-Demand Controls
MT controls are recommended when larger systems with multiple zones are used, and minimum wastewater storage is available. The units are designed to operate more than two pumps for residential and light commercial dose on demand. MT dose on-demand controls are configured with an adjustable run timer for each pump. This type of timer control is typically used to provide a measured flow to unequal-sized zones where flow equalization is not required. Each pump dose can be individually set by adjusting the pump run timers. The pumps operate on four (differential) float switches, three for pump control, plus one float switch for alarm indication. The dose volume is determined by the distance between the “Pump Off” and “Pump On” float switches. The pumps alternate after each individual timed pumping cycle until the specified dosing volume has been pumped. “Lag Pump” float switch terminals are provided for heavy flows. In lag pump mode, the control automatically rotates the lead pump past the lag pump on the next cycle so that it is not dosed twice in a row. This series of controls can also be configured for multiple zone valves rotating in sequence with each pump, time dosing as described above. The zone valves can be electro-mechanical rotating ball valves or hydraulically actuated solenoid valves.