3 installation of sc25f – Yokogawa SC25F User Manual

Page 13

IM 12B6J1-41E-E

3 INSTALLATION OF SC25F

For optimum measurement results, the
SC25F should be installed in a location
that offers an acceptable representation of
the process composition and

DOES NOT

exceed the specifications of the sensor.
The SC25F is designed with PG13.5
threaded connection to allow installation in
a wide variety of applications.

3.1 Typical installation
The SC25F sensor is designed for versatile
in-line, immersion or off-line installation. For
best results the SC25F should be mounted
with the process flow coming towards the
sensor, and positioned at least 15° above
the horizontal plane to eliminate air bubbles
in the pH glass bulb (see Figure 4).

Fig 4: Mounting positions of sensor

3.2 Preparing the sensor for use
Remove the sensor from its shipping box
and slide off the so-called ‘wet pocket’, the
tube filled with solution to prevent drying out
of the measuring elements during shipment
or storage. During shipment, electrolyte in
the sensor could be dislocated. To correct
this, place the sensor upright for 24 hours.
Before installing the sensor in the process it
should be calibrated. A general calibration
procedure is described in Section 6 of this
Instruction Manual.

3.3 Mounting the sensor
The simplest mounting is to use the PG13.5
threaded connection of the sensor. The
sensor is standard with a slide ring (Ryton)
and an O-ring (Silicon) for direct mounting
in a fitting provided with PG13.5 thread
(see Figure 5). Other O-ring materials are
available as a spare part (see Section 8 of
this Instruction Manual).

Note: When sensor is installed in a fitting

which is already provided with a
spacer for the sensor, remove the
pre-installed slide ring and O-ring
and follow the installation instructions
of the fitting.

Fig 5 : Simple mounting of sensor in

PR10 retractable fitting

I N C O R R E C T

1 5 º

H O R I Z O N T A L

G O O D

Adapter
PG13.5 to 3/4”NPT
K1523JB (PPO)
K1523JD (SS)

Seal, e.g. with
Teflon tape

3/4”NPT

1/4”NPT

Adapter
PG13.5 to SC-fitting
K1523JA (PPO)
K1523JC (SS)

Adapter
PG13.5 to 3/4”NPT
K1523JB (PPO)
K1523JD (SS)

Adapter
M25 x 1,5 - PG13.5
K1520JN (PVC)
K1520JP (SS)
K1500DV (PVDF)

1/4”NPT

Flow fitting SS
K1598AC

M9-Connector

Wrench 19

PG13.5

Slide ring (Ryton)

O-ring

10.7 -0.7

<25

120 / 225 ±2.0

223 ±2.0 / 328 ±2.0

Adapter
PG13.5 to SC-fitting
K1523JA (PPO)
K1523JC (SS)

FF40-S22
FS40-S22

O-ring 29.74 x 3.53

Fitting

Plastic FS40

Plastic FF40

3/4”NPT

Slide ring (Ryton)
O-ring

When mounting in
FD20
FF20
FS20
use O-ring 11 x 3

Slide ring (Ryton)
O-ring

Sensor
Holder
PG13.5

PG13.5

M25 x 1.5

Adapter PG13.5
M25 x 1,5
K1500DV (PVDF)
K1520JM (PVC)
K1520JP (SS)

PG13.5

13.5

Adapter PG13.5 to SC-fitting
K1523JA (PPO)
K1523JC (SS)

Sensor Holder
PG13.5
K1525AB

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