Metex 2200P pH Analyzer/Controller - Manual (Page 11)

Model 2200P Page 9
4.0 Description of Functions
4.1 Overview
4.1.1 The Model 2200P is a microprocessor operated pH analyzer designed for industrial
applications. It is compatible with a wide range of AquaMetrix pH probes and offers
several measurement ranges. The software in the unit makes the instrument very
easy to operate and maintain.
4.1.2 The outputs include voltage-free relay contacts and industry standard analog
transmission signals. Three programmable relays are provided for process control
and alarm. An LED indicates the status of each relay on the front panel. The
analog output signals transmit low power signals to peripherals such as data
recorders and PLCs.
4.1.3 The software is designed for ease of operation. It uses a simple menu with all items
indicated on the panel. The user interface consists of six buttons on the front panel.
The buttons are scanned and responded continuously. In addition, the software
performs an extensive system of checking values and parameters. All of the
operating parameters are stored in non-volatile memory, without the need of a
battery.
4.1.4 The Model 2200P operates like a normal analog converter with a number of
additional functions made possible by the microprocessor in the instrument.
Some of these are:
• Recall and easy adjustment of relay and output parameters
• Push button calibration
• Automatic Buffer recognition
• A HOLD function, which freezes, outputs when in menu mode
• Continuous checking of the probe during measurement
• Continuous self-check and watch-dog timer to ensure correct system operation
• Simulated input for testing
• Password protection of stored values
• Temperature Output
• Cycling feature for Control Relays A and B