Panel-mounted pH Digital Controller with Matching Pin – pH500 series-dual setpoint, on/off control, analog output

Display

• Large LCD with 4 ½ 17 mm digits and 3 ½ 10 mm digits.

Indicator LEDs

• Four LEDs are provided for signaling the energizing of relay 1 and 2 (yellow LEDs) and alarm relays (a green and a red LED).

PC Connectivity

• RS232C port allows for connection to a PC. Data transmission from the instrument to the PC is possible with the HI 92500 Windows® compatible application software offered by Hanna Instruments.

Fail Safe Alarm System

• Hanna’s exclusive Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption, which are typical risks in industrial environments. An alarm condition is indicated by a red LED, located directly on the front panel of the controller.

Differential Input

• In a system with poor grounding, it is possible to have a ground current flowing through the reference junction. This can cause a rapid degradation of the electrode. The Hanna differential input reduces the likelihood of ground loops.

Proportional Control

• Slows the pump down when the measured pH level approaches the set value, which ensures precise dosage and avoids costly waste of chemicals due to overdosage.

Analog Output

• To enhance troubleshooting and the ability to record data while monitoring, simply attach a recording device to the instrument’s 4 to 20 mA output contacts, conveniently located on the front panel, to obtain a hard copy of the results on demand.

Automatic Temperature Compensation

• A 2-wire Pt100 can be connected to provide automatic temperature compensation of measurements.

Relays

• 1 or 2 output relays for acid or base dosage (COM, NO and NC contacts) and 1 output relay for alarm condi-tion (COM, NO and NC contacts

Calibration

• Automatic up to 3 point calibration. alibration and Setup procedures allowed only through an unlock password.

Input

• pH electrode with BNC connector.