Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 43)

IM 12B07D02-01E
3-10 Installation and wiring
Figure 3-10b. Sensor wiring
3-6-2. Sensor cable connection with special grommet
In order to seal multiple sensor cables into EXA, a special grommet is provided that is designed to
accommodate one, two or three sensor cables (5 mm dia.) plus a liquid earth cable (2.5 mm dia.). In the
pack with the grommet are blanking pieces to close any unused holes. When correctly assembled, the
grommet maintains the IP65, NEMA 4X rating of the EXA PH202 housing.
Refer to figure 3-5 to assemble the grommet connections:
1. First remove the nut and standard rubber seal from the selected gland
2. Discard the seal. This will be replaced later by the special grommet
3. Thread the cables through the nut and the gland
4. Connect the cables to their designated terminals
5. Arrange the cables to avoid tangles and insert the grommet between the gland and the nut
6. The grommet is split to permit the cables to be mounted after connection. (This also ensures even
length adjustment.)
7. Ensure that any unused holes are filled with the blanking pieces
8. Tighten the nut to form a firm seal. (Hand-tight is sufficient.)
NOTE:
The special gland is intended to be used to seal the multiple cables from the Yokogawa flow
fittings such as FF20 and FP20. The designated cables are WU20 sensor cables, which are
approximately 5 mm (0.2") in diameter, and 82895002 liquid earth cables, which are approximately
2.5 mm (0.1") in diameter.
For sensor systems using a single cable, like the FU20 (FU25) and the PR20, PD20, PF20 and PS20,
the standard gland will accommodate the cable adequately. Single cables between approximately 6 mm
and 12 mm (0.28" and 0.47") can be sealed properly with these glands.
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Separate electrodes
ORP/REF electrode
Red
Yellow
Cable markers
11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Metal (measure)
16 Shield
17 Shield
Red
Black
Red
Blue
Blue
11 Temperature
12 Temperature
13 Reference
14 Solution ground(ORP)
15 pH
16 Shield
17
ORP/rH wiring
Note: ORP and or rH setting in service
code 02.
11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Metal (measure)
16 Shield
17 Shield
Blue
Blue
Red
White
Cable markers
Combined ORP/pH electrode
Notes
1. A temperature sensor maybe
connected to 11 & 12, for
temperature indication.
2. See section 5-3-1 for
impedance checking of glass
reference sensors.