Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 10)

IM 12J05C01-01E
Introduction 1-3
1-2. Application
The EXA transmitter 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-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 indicate dangerous limits of
a process, to monitor product quality, or to function as a simple controller for a BOD/COD 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 ade-
quately 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. If the unit must be mounted remotely from the
sensors, WF10 extension cable can be used up to a maximum of 30 metres (100 feet) with a BA10 junction
box.
The EXA is delivered with a general purpose default setting for programmable items. (Default settings are
listed in Chapter 5). 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 sensor used. The EXA
can be adjusted for galvanic and polarographics sensors.
To record such configuration adjustments, write changes in the space provided in APPENDIX 1 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 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 EMC Directive 89/336/EEC, to assure the user of continued accurate performance
in even the most demanding industrial installations.