5 Introduction
1.3. GENERAL DESCRIPTION & INTENDED USE
HI520 of the first dual‑input process controller Hanna Instruments
®
that accepts virtually any combination of
compatible probes.
Designed to adapt to unique process control requirements, HI520 operates a control‑loop system whereby users
have the option to run channel control independently or configure to be triggered sequentially upon reaching
the other channel's set point(s) (1, 2, or both).
The device operates a logical channel with built‑in mathematical functions. This function is intended for when
the controller works as an analyzer for monitoring high/low parameter levels between two identical input types
with identical measurement configurations.
Standardized main unit and mounting accessories (compatible with a variety of installations), plug and play
operation with all supported probes, secure and waterproof connections between controller and probe make
HI520 unit a versatile multiparameter platform.
The controller can be configured for a wide range of applications requiring control and monitoring of four main
water‑analysis parameters: pH, ORP, Conductivity, and Dissolved Oxygen and is suitable for wall‑, pipe‑, and
panel‑mounting installations.
The unit has a low profile vulcanized rubber keypad for all operations, blue LEDs to indicate when relays are
energized, multi‑color LEDs for detailed inspection of status.
The RS‑485 interface to probe, remote control and monitoring ports are EMI protected. Safety features include
fuse‑protected relays and a hold‑to‑safe‑values mode.
An intuitive interface for control setup, relay activation, alarm signaling (hold status) and the help and diagnostic
feature, guide users to identify problems and suggest possible action(s) to be taken.
Configuring control parameters can be done locally or remotely using the Modbus protocol and a compatible
Modbus server.
Shared‑function management
Smart technology enables optimization of probes for specific applications, such as different temperatures,
measurement modes, or ranges. When paired up, the system allows for shared management of settings between
controller and probes, where the controller manages only settings related to the intended application, as defined
by the requirements of the industrial process, and the probes manage measurement settings and warnings,
including temperature compensation and calibration.
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