GF 3-9900-395 DC-powered dual-relay output module

I. Product Overview

The GF 3-9900-395 is a DC-powered dual-relay output module within the GF Signet 3-9900 modular transmitter series. Designed for integration with 3-9900 main units (e.g., 3-9900-01), this module provides system power via DC input and features two configurable relay outputs for alarm or control functions. It is an ideal solution for applications requiring low-voltage power supply and relay-based switching.

II. Core Functions & Positioning

The 3-9900-395 serves two primary roles in a 3-9900 transmitter system:

DC Power Supply: Provides 18–36 VDC power to the transmitter main unit and connected sensors.

Dual Relay Control: Offers two independent Form C (SPDT) relay contacts for alarm triggering, equipment control, or status indication.

III. Key Features & Benefits

Dual Configurable Relays: Each relay supports programmable functions such as high/low alarms, fault indication, or pump/valve control.

DC Power Flexibility: Suitable for applications with DC power sources or hazardous environments where low-voltage operation is required.

Hot-Swappable Design: Enables module replacement or reconfiguration without system shutdown.

Compact Integration: Combines power and relay outputs in a single module, reducing wiring complexity.

Wide Compatibility: Compatible with all 3-9900 main units and input modules (e.g., 3-9901-F1, 3-9901-P1).

IV. Typical System Configuration

A complete transmitter setup with the 3-9900-395 includes:

Main Unit: 3-9900-01

Input Module: Selected based on sensor type (e.g., flow, pH, conductivity)

Power/Output Module: 3-9900-395 (DC power + dual relays)

Sensor: Compatible GF Signet sensor

Application Examples:

Alarm Signaling: Trigger audible/visual alarms for out-of-range pH, flow, or conductivity values.

Equipment Control: Start/stop pumps or valves based on process conditions.

DC-Powered Systems: Solar-powered monitoring stations, battery-backed installations, or intrinsically safe environments.

V. Technical Specifications

Power Input: 18–36 VDC

Relay Outputs: 2 × Form C (SPDT) contacts

Contact Rating: Typically 2 A @ 250 VAC / 30 VDC (verify datasheet)

Isolation: Relay contacts isolated from system power

Installation: Plug-in module for 3-9900 series main units

VI. Selection Guidance

Choose 3-9900-395 for DC-powered systems requiring relay control/alarms.

For AC-powered relay applications, consider 3-9900-392.

For analog output needs, refer to 3-9900-391 (analog) or 3-9900-393 (Modbus).

Always consult official GF documentation for detailed specifications and compatibility.

Keywords:

GF 3-9900-395, Signet relay output module, DC power module, dual relay module, 3-9900 series, alarm control module, low-voltage transmitter power.