What is the RIA15 process indicator?

• The RIA15 is a loop-powered local display (process indicator) designed to show process signals (e.g. 4-20 mA) in the field or on a panel.
• It can also support HART® communication to display additional sensor variables (up to four) when connected to HART-capable devices.
• It is often used where you want a local read-out of an analog loop without needing a full controller or separate power supply.

Key specifications & features

Here are some of the notable technical and functional features of the RIA15:

How it works / modes of operation

• In its standard analog mode, the RIA15 is inserted into the current loop (4-20 mA) and it measures the current, converts it to the configured engineering units, then displays that value locally.
• In HART mode, the device can poll the sensor via the HART protocol and fetch additional variables (e.g. temperature, pressure, diagnostics) to display.
• It can be either primary or secondary HART master. In a HART loop, typically there is one primary master (e.g. DCS / PLC) and optionally a secondary master (such as the RIA15) for local diagnostics
• The display can alternate among different HART variables based on configuration (e.g. PV → SV → TV → QV).

Use cases & advantages

• Local readout: Offers a way to visualize the loop’s process value right where the measurement is, without needing a full controller or remote display.
• Low voltage drop: Because it introduces very little voltage drop (≤ 1 V or ≤ 1.9 V in HART mode), it is suitable even when the loop supply voltage is tight.
• HART diagnostics: If your sensor is HART-enabled, you gain access to additional information (status, diagnostics, extra variables) via the indicator.
• Flexibility: It can be panel-mounted or used in the field, and is configurable on-site with minimal tools.
• Safety use: Where applicable, “LA” versions allow using the indicator as part of a safety instrumented system (SIS), with restrictions and proper proofs/tests.