(3) The Intrinsically Safe Duplexer, ISD, is a low cost SCADA ready intrinsically safe pump controller designed to perform level control for duplex lift station applications.
The controller's level inputs may be connected to either five float switches, five single point conductance probes, or five selected points on a ten point conductance probe.
The level inputs are intrinsically safe and allow maintenance personnel to safely handle the float switches or conductance probes while the unit is in operation.
The unit provides a 10 second power-up start delay, a 5 second lag pump delay, and duplex alternation.
The unit has LEDs that show power on status, level input status, pump call status, high & low alarm status, and ...
The Intrinsically Safe Relay ISR provides a safe and reliable method of load control when interfaced with a contact closure in a hazardous location. When the control switch input is closed between pins 1 and 8, the output relay becomes energized, and the LED is illuminated. When the control switch input is open, the output relay is de-energized, and the LED is turned off. It provides intrinsically safe circuits for use in Class I, Groups A, B, C, D Class II, Groups E, F, G and Class III - Hazardous Locations. The socket is included with the Intrinsically Safe Relay.
The ISB10 provides an intrinsically safe barrier ISB between a 10 channel conductance probe in a hazardous location and pump controls in a non-hazardous area. The barrier is designed to allow the level sense signal (±12V square wave) from the pump control device to pass through unchanged. If an accident or malfunction occurs in the control panel that would potentially connect spark-inducing energy to the probe wiring in the wet well, the barrier clamps to limit the voltage and current to a safe level. The barrier has a fuse in each channel that is capable of disconnecting the barrier from a high energy source that may be present in the control panel.
