PROCESS INDICATOR – [ABM]

• Measurement: It measures inputs from different types of sensors, such as temperature (thermocouples, RTDs), pressure, flow rate, level, humidity, voltage, and current (e.g., 4-20 mA, 0-10 V signals).
• Display: It features a digital display (often 4-digit or more, sometimes a "jumbo display" for better visibility) to show the measured parameters.
• Control/Alarm (Optional): Many process indicators have programmable features, such as alarm outputs (e.g., blinking alerts) or relay outputs for simple ON/OFF control functions, which trigger when setpoints are exceeded.
• Applications: They are widely used in various industries, including textile mills, chemical processing, and automation systems, to ensure efficient monitoring and control of operations.
• Universal Input: Many models, including those offered by ABM, support a universal input, allowing them to be configured for different sensor types and signal ranges. 

• Function: Designed to monitor and display various process variables in industrial settings, such as temperature, pressure, flow, level, DC voltage, or current.
• Input Types: It probably has a universal input configuration, accepting standard signals like 4-20mA, 0-20mA, 0-10V DC, or inputs from thermocouples (J, K, T, R, S) and RTD (Pt100) sensors.
• Display: Features a digital display (likely 4-digit LED) for clear visualization of the measured values.
• Power Supply: Likely includes a built-in 24V DC sensor power supply to power connected field instruments.
• Mounting: Typically designed for panel mounting.
• Optional Features: May include optional dual relay outputs for alarms or control, and potentially RS485 MODBUS RTU communication capabilities. 

Note: "4004" may also refer to the historic 

 or the newer AMD EPYC 4004 series server processors, but the context of "PCU" in an industrial setting suggests a process control unit or process indicator.