Description
GF Signet 3-9950.393-2 Relay Module — Two Mechanical and Two Solid-State Relays
Manufacturer Part Number: 3-9950.393-2
GF Product Code: 159 310 269
Product Type: Plug-In Relay Output Module
Compatibility: GF Signet 9950 Dual Channel Transmitter
Relay Configuration: Two mechanical relays and two solid-state relays
Product Overview
The GF Signet 3-9950.393-2 Relay Module is a plug-in output module designed to expand the control capabilities of the GF Signet 9950 Dual Channel Transmitter. Equipped with two mechanical relays and two solid-state relays, this module allows the Signet 9950 to operate alarms, control valves, interface with pumps, activate chemical-feed equipment, and provide output signals to other process-control devices.
The combination of mechanical and solid-state relay outputs provides flexibility for applications requiring both conventional load switching and fast, low-current control signals. Mechanical relays can switch higher electrical loads, while the solid-state relays are well suited for rapid cycling, proportional pulse control, and interfacing with compatible electronic equipment.
The module installs directly into the Signet 9950 transmitter and is secured with a single retaining screw. It can be added during initial system assembly or installed later as process-control requirements expand. Removable terminal blocks simplify wiring, installation, and future maintenance.
Key Features and Benefits
- Four total relay outputs: Includes two mechanical relays and two solid-state relays.
- Designed for the GF Signet 9950: Provides direct plug-in compatibility with the Signet 9950 Dual Channel Transmitter.
- Flexible process control: Supports alarms, valve actuation, pump control, chemical-feed operation, timer functions, and compatible proportional pulse applications.
- High-capacity mechanical relays: Each mechanical relay is rated for up to 5 A at 250 VAC or 5 A at 30 VDC.
- Fast solid-state outputs: Each solid-state relay is rated for up to 50 mA at 30 V AC/DC.
- Advanced control capability: Works with the programmable relay functions of the Signet 9950, including high and low limits, timer-based control, and advanced Boolean logic.
- Simple field installation: The plug-in design allows the module to be installed before or after the 9950 transmitter is placed into service.
- Removable wiring terminals: Simplifies initial wiring, troubleshooting, and equipment replacement.
- Broad wire compatibility: Terminal blocks accept conductors ranging from 12 to 24 AWG.
- Expandable system design: Allows users to add control outputs without replacing the existing Signet 9950 transmitter.
Technical Specifications
| Specification | Rating or Description |
|---|---|
| Manufacturer | GF Signet |
| Manufacturer Part Number | 3-9950.393-2 |
| GF Product Code | 159 310 269 |
| Compatible Instrument | GF Signet 9950 Dual Channel Transmitter |
| Total Relay Outputs | Four |
| Mechanical Relays | Two |
| Mechanical Relay Type | Dry-contact relays with normally open, normally closed, and common terminals |
| Mechanical Relay Rating | 5 A at 250 VAC or 5 A at 30 VDC |
| Solid-State Relays | Two |
| Solid-State Relay Rating | 50 mA at 30 V AC/DC |
| Accepted Wire Size | 12–24 AWG |
| Mounting Method | Internal plug-in module secured by retaining screw |
| Terminal Style | Removable screw-terminal blocks |
Process-Control Applications
The GF Signet 3-9950.393-2 relay module is suitable for a wide range of industrial water and process-control applications, including:
- Reverse osmosis systems
- Industrial water treatment
- Wastewater treatment
- Deionization systems
- Media filtration equipment
- Chemical dosing and injection
- pH neutralization systems
- Cooling-tower control
- Pump protection and shutdown
- High- and low-level alarms
- Flow alarm and control
- Pressure and differential-pressure monitoring
- Conductivity and resistivity control
- Valve actuation
- Fume scrubbers
- Rinse tanks
- Pools, fountains, and aquatic life-support systems
When installed in a properly configured Signet 9950, the module can respond to measurements such as flow, pH, ORP, conductivity, resistivity, pressure, temperature, level, salinity, dissolved oxygen, and compatible 4–20 mA process inputs.
Typical Control Functions
Depending on the connected sensors and the programming of the Signet 9950, the 3-9950.393-2 can be used for functions such as:
- Activating an alarm when a process value exceeds a high or low limit
- Shutting down a pump during low-flow or low-level conditions
- Operating a chemical metering pump based on process demand
- Opening or closing an electrically actuated valve
- Providing proportional pulse control to compatible equipment
- Signaling a PLC, building-management system, or remote alarm panel
- Initiating maintenance alarms based on pressure, conductivity, or flow
- Controlling equipment using multiple process conditions through Boolean logic
- Providing timer-based equipment operation
Mechanical and Solid-State Relay Advantages
The mixed relay configuration makes the 3-9950.393-2 a versatile choice for process-control panels.
The mechanical relays provide normally open, normally closed, and common contacts for switching compatible AC or DC loads. They are commonly used for alarms, control valves, pump interlocks, motor-starter circuits, and other equipment requiring dry-contact switching.
The solid-state relays provide fast, low-current switching without mechanical contact movement. They are useful for proportional pulse applications and for signaling compatible electronic control equipment where frequent relay cycling may be required.
All connected loads must remain within the published voltage and current ratings of the applicable relay output.
Installation Information
The relay module plugs directly into the compatible expansion position inside the GF Signet 9950 transmitter and is secured with the supplied retaining screw. The removable terminal blocks should be disconnected from the module before installation.
Power to the transmitter and connected control circuits must be disconnected before installing, removing, or wiring the relay module. Appropriate electrostatic-discharge precautions should also be followed when handling the exposed circuit board.
When switching inductive or other active loads, contact arcing may shorten mechanical relay life or damage the relay contacts. GF recommends using an appropriate suppression device, such as the GF Signet 3-8050.396 RC Filter Kit, where required by the connected load.
Compatibility Notice
The GF Signet 3-9950.393-2 is an expansion relay module, not a complete transmitter or standalone controller. A compatible GF Signet 9950 Dual Channel Transmitter is required for operation. Verify the transmitter configuration, connected load, wiring requirements, and available module position before ordering or installation.
Why Choose the GF Signet 3-9950.393-2?
The GF Signet 3-9950.393-2 provides a practical way to add flexible output control to an existing Signet 9950 measurement system. Its combination of two higher-capacity mechanical relays and two fast solid-state relays supports a broad range of alarm, interlock, dosing, and equipment-control functions. The direct plug-in design also helps reduce panel complexity and eliminates the need to replace the primary transmitter when additional control outputs are required.
