Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 13)

<1. INTRODUCTION AND GENERAL DESCRIPTION>
1-1
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
1. INTRODUCTION AND GENERAL
DESCRIPTION
This manual describes how to use the FLXA21 with Yokogawa’s or other companies’ sensors.
Please read carefully this manual and the instruction manual of the relevant sensor before using
this instrument.
For the specifications of the FLXA21, please refer to the General Specifications (GS 12A01A02-
01E) in the attached CD-ROM.
The FLXA21 2-Wire Analyzer can perform 4 kinds of measurements – pH/ORP (oxidation-
reduction potential), contacting conductivity (SC), inductive conductivity (ISC) or dissolved
oxygen (DO) – with the respective sensor module.
For the pH/ORP measurement, the FLXA21 can be connected to conventional analog pH/ORP
sensors, and to Yokogawa’s digital sensor, FU20F pH/ORP SENCOM Sensor with the respective
sensor module.
The FLXA21 can perform single or dual sensor measurement. For dual sensor measurement,
the combination of two same type sensor inputs – pH/ORP and pH/ORP (analog sensor only),
SC and SC, and DO and DO –are available with two sensor modules.
When using with the pH/ORP SENCOM sensor, please refer to the section 15, 16 and 17 of this
manual for the operation, commissioning and calibration respectively.
1
ON
2
ON
Cable entry holes
Wiring cover 1 (for the first module)
Jumper holder
(provided only for
pH measurement)
Front view Front view with the front panel opened
Front view with all wiring covers removed
Reboot switch
(Do not use it)
Terminal block
for power supply
LCD display (not provided in some models)
Slide switch
(for HART only)
Wiring cover 2
(for the second module)
Front panel
The first module
(The second module if any
is installed here.)
Nameplate
(Wiring cover 3 for power
supply and grounding is
under the wiring cover 2.)
Figure 1.1 Parts names and descriptions
1
PH
SC
ISC
DO
SENCOM