Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manual (Page 12)

IM 12D08B02-01E
Introduction 1-3
1-2. Application
The EXA transmitter is intended to be used for continuous on-line measurement in industrial installa-
tions. The unit combines simple operation and microprocessor-based performance with advanced self-
diagnostics and enhanced communications capability to meet the most advanced requirements. The
measurement can be used as part of an automated process control system. It can also be used to indi-
cate dangerous limits of a process, to monitor product quality, or to function as a simple controller for a
dosing/neutralisation system.
Yokogawa designed the EXA analyzer to withstand harsh environments. The transmitter 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
pushbutton 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
proper installation site will permit ease of operation. Sensors should normally be mounted close to the
transmitter in order to ensure easy calibration and peak performance.
The EXA is delivered with a general purpose default setting for programmable items. (Default settings
are listed in Chapter 5 and again in Chapter 11). 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 five different types of tem-
perature sensors.
To record such configuration adjustments, write changes in the space provided in Chapter 11 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 sys-
tems and a wide range of third-party commercially available probes. For best results, read this manual
in conjunction with the corresponding sensor user’s manual.
Yokogawa designed and built the EXA to meet the CE regulatory standards. The unit meets or exceeds
stringent requirements of EN61326 Class A without compromise, to assure the user of continued accu-
rate performance in even the most demanding industrial installations.