Bring existing 4–20 mA instruments into view.
Connect instrument signals to Modulink Indi and view readings, trends and alerts on your site.
From instrument to operating record
- Connect the signal. Indi reads compatible 4–20 mA transmitters for pressure, flow, temperature and other measurements.
- Send readings wirelessly. Choose site Wi-Fi or LoRa to connect terminals to your Base Station.
- See the context. Review readings and history, set alerts and add application workflows.
Choose the connection for your site
Indi Wi-Fi serves higher data rate applications within site Wi-Fi coverage. Indi LoRa serves distributed equipment with lower data rate requirements. Both current configurations are line-powered and available for customer samples.
See it in production
Falcon Water Technologies uses Modulink to monitor pressure, flow and temperature on RO membrane-cleaning skids and record cleaning cycles.
Monitor existing instruments without assuming every loop is compatible
Indi supports shunt-mode analog-input integration with existing PLC/SCADA instrumentation. Before connecting it, review the transmitter model, active or passive output, loop-power supply, input loading, references and existing controller. Confirm the instrument indication and existing control-system reading after integration. Engineering must determine the selected wiring arrangement.
Both current Indi configurations provide two 4–20 mA input channels. Indi Wi-Fi uses 12–24 VDC line power; current Indi LoRa uses nominal 24 VDC line power. LoRa also has two ground-referenced 0–10 V inputs. These are product interfaces, not a claim that every instrument or plant protocol is supported.
Check the current electrical interfaces. Numerical input accuracy, isolation and load limits need the applicable product documentation; no unsupported values are supplied here.
Check scaling before relying on a dashboard
Record what the transmitter’s 4 mA and 20 mA endpoints mean and confirm the displayed engineering units. For a linear transmitter only, engineering value = lower endpoint + (current in mA − 4) ÷ 16 × (upper endpoint − lower endpoint).
For example, a hypothetical linear 0–100 psi transmitter at 12 mA represents 50 psi: 0 + (12 − 4) ÷ 16 × 100. This is a calculation example, not a measured Modulink reading, accuracy specification or installation result. Review non-linear transfer functions and fault signals against the actual instrument documentation.
During commissioning, compare the received value with an appropriate instrument reference and the existing controller. Confirm the required sample/report interval, alarm conditions and response to missing readings.
Download a blank instrument and scaling worksheet (CSV) to record transmitter models, 4 mA / 20 mA endpoints, units, wiring responsibilities and existing controller connections before an engineering review.
Choose the complete monitoring path
The terminal acquires compatible electrical signals; the on-site Base Station provides local readings, history, alerts and Skills. A secure site-network connection is separately required for off-site users. Field Wi-Fi or LoRa alone does not provide remote internet access.
Plan pump pressure, flow and valve feedback, review an RO/CIP application or compare industrial monitoring approaches.
Start with your instrument list
Send us instrument models, signal types and installation locations. Engineering can assess the connection and recommend a configuration.
Talk through your application
Tell us about your equipment and the decisions you need to make. Our engineering team will help you choose a system.