Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 102)

IM 12B07D02-01E
Appendix 11-5
When the option of the screw terminal "/TB" is specified, the terminal block layout is as follows.
+ G 11 14 13 NC HIGH IMP 16
NC 12 17 LOW IMP NC 15
Note: Nothing is connected to NC
F3.8E.eps
When a pH sensor is used, connect both terminals LOW and IMP on the upper row with a shorting
bar and nothing to both terminals HIGH and IMP on the lower row.
When an ORP sensor is used, connect both terminals LOW and IMP on the upper row with a shorting
bar as well both terminals HIGH and IMP on the lower row with another one.
11-3-2. Sensor cable connection using terminal box
If you can't install a sensor close to the PH202 transmitter, you may need to connect to an
intermediate terminal box (WTB10-PH1, -PH2) and use an extension cable. You should order these
from Yokogawa, as these Yokogawa parts are specially designed so that system specifications will be
met. The total cable length (for 5 m electrode cable plus 15 m extension cable) may be up to 20 m.
Refer to Figure 11-1 for the wiring.
11-4. PH201G*B Dedicated Distributor
The PH202 supports proprietary bidirectional serial communications with the PH201G (Style B) for
remote maintenance, washing and remote diagnostic purposes. This allows PH202 status (under
maintenance/abnormal) to be monitored remotely, and commands to be sent to an instrument for
wash. Prepare for the instrument separately. Service codes 60 relates to communication settings.
11-4-1. Communication setup
Code 60 *COMM. The settings should be adjusted to suit the communicating device connected to the
output. The communication can be set to HART or to PH201G (Style B) distributor.
When used with our PH201G (Style B) you can enable or disable contact outputs,
namely, Fail contact and Hold contact. The PH201G (Style B) can output Hold
contact and Fail contact signals. You can set Service Code 53 to “0” for “soft fail”
to disable.
Fail contact output. When you set Service Code 53 to “1” for “hard fail”, set Service
Code 60 to “2.0” to enable Fail contact output of PH201G (Style B), or set Service
Code 60 to “0.1” to disable Fail contact output of PH201G (Style B).
*ADDR. Select address 00 for point communication with 4-20 mA transmission. Addresses
01 to 15 are used in multi-drop configuration (fixed 4 mA output).
Code Display Function Function detail X Y Z Ddefault values
Communication
60
*COMM Communication Set communication Off 0 1.0( * ) Off
Set communication On 1
write enable 0
write protect 1
Set communication PH201G*B 2
Without half time check by setting 2.0 0
With half time check by setting 2.1 1
*ADDR. Network address Set address 00 to 15 00
T5.3.6.eps (*) Valid for instrument using software version 3.1 or later.
For earlier versions the default is 0.1.