YOKOGAWA EXA DO402G, Instruction Manual

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1-2 Introduction
IM 12J6B3-E-H
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-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 dosing/neutralization system.
Yokogawa designed the EXA analyzer to withstand harsh environments. The converter may be installed
either indoors or outside because the IP65 (NEMA4X) 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 converter 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.
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 four 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 instruction 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 instruction manual.
Yokogawa designed and built the EXA to meet the CE regulatory standards. The unit meets or exceeds
stringent requirements of EN 55082-2, EN55022 Class A and low voltage safety directive IEC1010 without
compromise, to assure the user of continued accurate performance in even the most demanding industrial
installations.