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Models 396 and 398
pH/ORP Sensors
Instruction Sheet
PN 51A-396/rev.F
January 2011
SPECIFICATIONS
pH Range*: AccuGlass: 0-14 pH
Wetted Materials:
Model 396: polypropylene, 316 stainless steel,
glass, EP
Model 398: Tefzel; titanium; glass; and choice of
Kalrez, Viton or EPDM o-rings
Interconnecting Cable: 15 ft (4.6 m), for use with
remote preamplifier
Temperature Rating: 0 to 100° C (32 to 212° F)
Pressure Range:
Model 396:
Hemi bulb: 100 - 1136 kPa (abs) (0 - 150 psig
Flat bulb: 100 - 790 kPa (abs) (0 - 100 psig)
Model 398:
Hemi bulb: 100 - 1825 kPa (abs) (0 - 250 psig)
Flat bulb: 100 - 790 kPa (abs) (0 - 100 psig)
Minimum Conductivity: 75 μS/cm, nominal 100 μS/cm
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)
Process Connections: None: must use 1 in. MNPT
process connector PN 23166-00 or 23166-01
*PERCENT LINEARITY
pH range hemi bulb GPHT flat bulb GPLR
0-2 94% 93%
2-12 99% 98%
12-13 97% 95%
13-14 92% —
Glass electrode must be wetted at all times (in storage
and in line) to maximize sensor life.
Do not connect sensor to power lines. Serious injury
may result.
For additional information, please visit our website
at www.emersonprocess.com/raihome/liquid/.
WARNING
Before removing the sensor, be absolutely certain
that the process pressure is reduced to 0 psig and
the process temperature is lowered to a safe level!
WARNING
The wetted sensor materials may not be compatible
with process com position and operating conditions.
Application compat ibility is entirely the
responsi-
bility of the user.
CAUTION
SENSOR/PROCESS APPLICATION COMPATIBILITY
ATEX DIRECTIVE
Special Conditions for safe use
1. All pH/ORP sensors have a plastic enclosure which must only be cleaned with a damp cloth to avoid the
danger due to a build up of an electrostatic charge.
2. All pH/ORP sensor Models are intended to be in contact with the process fluid and may not meet the 500V
r.m.s. a.c. test to earth. This must be taken into consideration at installation.
WARNING
DANGER