Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 12)

IM 12B07D02-01E
Introduction 1-3
NOTE : Check that all the parts are present, including mounting hardware, as specified in the option
codes at the end of the model number.
For a description of the model codes, refer to Chapter 2 of this manual under General
Specifications.
Basic Parts List: Transmitter PH202
User’s Manual English
Optional mounting hardware when specified (See model code)
NOTE: mounting screws and special grommet are packed in the terminal compartment, together with a
second link for impedance selection.
1-2. Application
The EXA converter is intended to be used for continuous on-line measurement in industrial installations.
The unit combines simple operation and microprocessor-based performance with advanced self-diag-
nostics and enhanced communications capability to meet the most advanced requirements. The meas-
urement can be used as part of an automated process control system. It can also be used to indicate
dangerous limits of a process, to monitor product quality, or to function as a simple controller for a dos-
ing/neutralization system.
Yokogawa designed the EXA analyzer to withstand harsh environments. The converter may be installed
either indoors or outside because the IP65 (NEMA 4X) housing and cabling glands ensure the unit is
adequately protected. The flexible polycarbonate window on the front door of the EXA allows pushbut-
ton access to the keypad, thus preserving the water and dust protection of the unit even during routine
maintenance operations.
A variety of EXA hardware is optionally available to allow wall, pipe, or panel mounting. Selecting a prop-
er installation site will permit ease of operation. Sensors should normally be mounted close to the con-
verter in order to ensure easy calibration and peak performance. If the unit must be mounted remotely
from the sensors, WF10 extension cable can be used up to a maximum of 50 metres (150 feet) with a
BA10 junction box. Except installations with dual high impedance sensors, where the maximum cable
length is 20 metres using integral cable only (no junction box).
The EXA is delivered with a general purpose default setting for programmable items. (Default settings
are listed in Chapter 5 and again in Chapter 10). While this initial configuration allows easy start-up, the
configuration should be adjusted to suit each particular application. An example of an adjustable item
is the type of temperature sensor used. The EXA can be adjusted for any one of eight different types of
temperature sensors.
To record such configuration adjustments, write changes in the space provided in Chapter 10 of this
manual. Because the EXA is suitable for use as a monitor, a controller or an alarm instrument, program
configuration possibilities are numerous.
Details provided in this user’s manual are sufficient to operate the EXA with all Yokogawa sensor
systems and a wide range of third-party commercially available probes. For best results, read this man-
ual in conjunction with the corresponding sensor user’s manual.