4–20mA Signal Splitters and Isolators
Need to send one process signal to two separate control or monitoring devices?
Acromag signal splitters duplicate a single input signal into two galvanically isolated outputs. They allow a field signal to be shared between equipment such as PLCs, SCADA systems, panel meters and data loggers. Whilst helping prevent ground loops, reduce electrical noise and protect connected equipment from transient signals.
The range includes loop-powered models where a separate supply is not available, and externally powered models for applicat
Choose the Right 4–20mA Signal Splitter
Use the table below to compare the available Acromag signal splitter models. If you are unsure which model suits your application, contact Metromatics with your input signal, required outputs and available power supply.
| Model | How It Is Powered | Input | Outputs |
|---|---|---|---|
| SP233 | Loop-powered or local 7–32 VDC supply | Thermocouple or ±100 mV | Two isolated 4–20 mA outputs |
| SP236 | Loop-powered | DC current or low-level voltage | Two isolated 4–20 mA outputs |
| SP237 | Loop-powered | ±1 V, ±5 V or ±10 V | Two isolated 4–20 mA outputs |
| SP238 | Loop-powered or local 7–32 VDC supply | ±15 V, ±75 V or ±150 V | Two isolated 4–20 mA outputs |
| 653T | Powered from the output loop | 4–20 mA | Two isolated 4–20 mA outputs |
| SP333 | Separate 6–32 VDC supply | Thermocouple or ±100 mV | Two configurable current or voltage outputs |
| SP336 | Separate 6–32 VDC supply | DC current or low-level voltage | Two configurable current or voltage outputs |
| SP337 | Separate 6–32 VDC supply | ±1 V, ±5 V or ±10 V | Two configurable current or voltage outputs |
| SP338 | Separate 6–32 VDC supply | ±15 V, ±75 V or ±150 V | Two configurable current or voltage outputs |
| 633T | Separate 15–36 VDC or 90–250 VAC supply | 4–20 mA | Two isolated 4–20 mA outputs |
Loop-powered models take operating power from the existing signal loop, so no separate power supply is required. Externally powered models require their own DC or AC supply, but provide more flexible input and output configurations.
Typical Signal Splitter Applications
- Sending one field signal to both a PLC and SCADA system
- Adding a data logger or panel meter without disrupting an existing control loop
- Reducing ground-loop noise between connected control equipment
- Providing isolated outputs for monitoring, control or alarm systems
- Converting thermocouple, millivolt or voltage signals into isolated current or voltage outputs
Browse by Power Arrangement
Loop-Powered Signal Splitters
Use the existing signal loop for power where a separate supply is unavailable. Suitable for applications requiring isolated 4–20mA outputs from current, voltage, thermocouple or millivolt inputs.
Externally Powered Signal Splitters
Use a separate DC or AC supply where flexible current or voltage output configurations are required.
Loop Powered Signal Splitters
SP230 Series: Loop-Powered Signal Splitters for Thermocouple, Millivolt, Current and Voltage Inputs
 |  |  |
| SP233: Process Loop Splitter | SP236: Process Loop Splitter | SP237: Process Voltage Input Signal Splitter, Two Wire |
| The SP233 converts one thermocouple or millivolt input into two proportional, galvanically isolated 4–20mA control signals. Powered from one or both output loops, or from a local 7–32 VDC supply. | The SP236 converts one DC current or low-level voltage input into two proportional, galvanically isolated 4–20mA control signals. Powered from one or both output loops. | The SP237 converts one process-voltage input into two proportional, galvanically isolated 4–20mA control signals. Powered from one or both output loops. |
 | ||
| SP238: High Voltage Input Signal Splitter, Two Wire | ||
| The SP238 converts one high-level DC voltage input into two proportional, galvanically isolated 4–20mA control signals. Powered from one or both output loops, or from a local 7–32 VDC supply.
|
653T: Loop-Powered 4–20mA Signal Splitter
 | ||
| 653T: Signal Splitter, Loop Powered | ||
| The 653T duplicates one 4–20mA process-current input into two identical, isolated 4–20mA outputs. Powered from the output loop. Suited to applications where a separate power supply is not available. |
Externally Powered Signal Splitters
SP330 Series: Externally Powered Signal Splitters with Configurable Outputs
 |  | |
| SP333: Thermocouple/millivolt splitter, four wire | SP336: Four-Wire Current/millivolt Signal Splitter | SP337: Four-Wire Process Voltage Input Signal Splitter |
| The SP333 converts one thermocouple or millivolt input into two galvanically isolated proportional control signals. It supports a range of configurable current and voltage outputs and requires a 6–32 VDC external power supply. | The SP336 converts one DC current or low-level voltage input into two galvanically isolated proportional control signals. It supports a range of configurable current and voltage outputs and requires a 6–32 VDC external power supply. | The SP337 converts one process-voltage input into two galvanically isolated proportional control signals. It supports a range of configurable current and voltage outputs and requires a 6–32 VDC external power supply. |
 | ||
| SP338: Four Wire High Voltage Input Signal Splitter | ||
| The SP338 converts one high-level DC voltage input into two galvanically isolated proportional control signals. It supports a range of configurable current and voltage outputs and requires a 6–32 VDC external power supply. |
633T: AC/DC-Powered 4–20mA Signal Splitter
 | ||
| 633T: Signal Splitter, AC/DC-Powered | ||
| The 633T duplicates one 4–20mA process-current input into two identical, isolated 4–20mA outputs. Requiring a separate 15–36 VDC or 90–250 VAC power supply. Suited to applications requiring an AC/DC-powered splitter. |
Need Help Selecting a Signal Splitter?
Tell us your input signal, required outputs, available power supply and the equipment you are connecting. Metromatics can recommend a suitable Acromag model and provide pricing for your application.
