Manufacturer: Emerson (Westinghouse)Model: 3A99862G14Module Type: Isolated Analog Input ModuleArchitecture: Standard Q-Line rack mountedChannels: 8 isolated differential analog input channelsAvailable Signal Ranges: 0–5 VDC, 1–5 VDC, ±2.5 VDC, 4–20 mA, 0–20 mAResolution: 12-bit, 13-bit for bipolar voltage signalsIsolation Rating: 1000 Vrms between channel and groundInput Impedance: Greater than 10 MΩ for voltage input, approximately 250 Ω for current inputConversion Time: Less than 5 milliseconds per channelAccuracy: ±0.1% of full scale at 25 degrees CelsiusOperating Temperature Range: 0 °C to 60 °CPower Supply: 24 VDC with ±10% tolerance, typical power consumption 8 WStatus Indicators: LED indicators for power, communication and channel operating statusSystem Compatibility: Legacy WDPF and Ovation distributed control systemsWeight: Approximately 1.1 kg

This module supports multiple standard analog signal types to match various field transmitters and sensors. The built-in 1000 Vrms isolation effectively suppresses electromagnetic interference and eliminates ground loop problems in harsh industrial environments. It is equipped with LED status indicators for quick on-site inspection and fault diagnosis. The hot-swap function allows module replacement during normal system operation without shutting down the whole control system. Adopting industrial-grade components, it ensures stable and continuous operation for long-term service.

It is used to monitor temperature, pressure, flow rate and liquid level in power plants. In petrochemical industry, it acquires and tracks various process parameters for production control. It also works for pump speed, pressure and flow monitoring in water and wastewater treatment facilities. This module is mainly used for maintenance and spare part replacement of existing WDPF and Ovation legacy systems.

3A99860G01, 3A99860G02 and 3A99860G04 are 8-channel analog input modules belonging to the same Q-Line product family.

This is a legacy I/O module, primarily provided as replacement parts for on-site running DCS systems. For new projects, Emerson recommends the latest generation Ovation I/O modules to achieve better performance and more comprehensive diagnostic functions.