HI-504924-2 pH/ORP Controller

Measures and controls pH across an extended pH range of -2.00 to +16.00pH and -2000 to +2000mV with a temperature range of -30 to +130 C. A comprehensive specification allows a high degree of customisation for the pH/ORP application you wish to control:

• Can be used to control pH or ORP
• User selectable PID, PI, proportional on/off control of pH or ORP
• Two user selectable dosing set-points plus 1 alarm relay set-point
• Sensor Check for real time pH or ORP electrode status monitoring
• Accepts inputs from either a digital transmitter or direct from an electrode
• Matching pin compatibility to eliminate ground loop effect interference
• Logging of up to 100 system events, and up to 6000 individual readings (pH/ORP
• Automatic probe cleaning from alarm or user request
• Fail safe alarm system
• Programmable cleaning cycles and hold systems

The HI-504 is a PID, PI, proportional or on/off controller with one of two set points. The measurement configuration settings and control of pH and ORP are saved separately and permits users to switch between pH and ORP without losing settings. The pH channel can be calibrated in 2 calibration points. The instrument has a full auto diagnostic procedure. Sensor check is also available for pH and ORP probes.

Temperature is continuously monitored using a temperature sensor (Pt100 or Pt1000type) with automatic temperature compensation of pH.

One or two analogue controller outputs (0-20 or 4-20mA) can be configured for pH/ORP recording or controlling (only for models with PID), and relays can be used to control the process or be connected with alarm status.

Controller status is visible with LED’s on the front panel and on the LCD display.

The controllers logging feature can save up to 6000 samples pH/°C or ORP and last 100 error, configuration, calibration and cleaning events. This information is accessible from a PC through RS485 and HI-92500 software. The powerful HI-92500 software has graphing capabilities and can print graphs directly or can be saved as a bitmap. Data can be exported in common spreadsheet formats.

Fail-Safe Alarm System

HANNA exclusive Fail-safe Alarm System protects against problems caused by power supply failure or signal interruption, which are typical risks in industrial environments. The system acts both on a hardware and a software level. The alarm relay functions in a normally closed condition, and is tripped when there is a power failure if, for example, the power cable is accidentally cut. This function is very important in industrial plants where alarms are usually not activated if there is a power supply interruption, which can cause serious damage due to a loss of control of the process plant. At the software level, the fail safe function activates an alarm in case of abnormal circumstances, for example if the dosing contacts remain closed for an excessive period. The alarm condition is also signalled by a red LED, located directly on the front panel of the controller.

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