Refer to the System 450 Series Modular Control Systems with Standard Control Modules Technical Bulletin (LIT-12011459), the System 450 Series Modular Controls Product Bulletin (LIT-12011458), and the installation instructions for product specifications, detailed installation procedures, and important product safety information.
You can use System 450 to measure a pressure difference across pumps, heat exchangers, and similar devices where you want to control a device using differential pressure. Compared to a Differential Pressure Transmitter (DPT), installing System 450 is simpler, requires less hardware, and is less labor-intensive, saving time and money. System 450 parameters are easy to configure and readjust, if necessary, making it much more flexible than a DPT.
A DPT requires a manifold, a bleeder valve, isolation valves, a bypass valve, and associated piping. Only the isolation valves are required for a System 450 installation.
In this example, a System 450 control system with two identical pressure transducers is set up to control pump speed based on the pressure differential detected between the Sn-1 and Sn-2 transducers. When Sn-1 and Sn-2 are the same Sensor type, the Differential Sensor (Sn-d) is automatically enabled and available for selection when you set up the control system outputs.
When the Differential Control sensor (Sn-d) is referenced, the differential sensor value is always equal to Sn-1 minus Sn-2.
The sensed differential value (Sn-d) between Sn-1 and Sn-2 is displayed in the System Status screens as either a temperature differential value (dIFT), pressure differential value (dIFP), or humidity differential value (dIFH). For example, if Sn-1 has a value of 58 andSn-2 has a value of 55, Sn-d has a value of 3 (58 minus 55).
