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MODEL TF396
DESCRIPTION AND SPECIFICATIONS
1.1 FEATURES AND APPLICATIONS
The ion-selective field effect transistor (ISFET) pH
electrode provides a stable pH measurement. Its rate
of response can be ten times faster than glass elec-
trodes, enabling better process control. Its short
response time and increased stability at low tempera-
tures make it suitable for use in cold processes like
brine or water for cooling. Aging effects caused by
temperature fluctuations or large changes of process
pH are greatly reduced, providing longer intervals
between calibration and maintenance of the sensor.
Because there is no glass bulb, it can be used in
many applications that restrict or prohibit pH glass
electrodes due to the risk of broken glass getting into
the process. It may also provide longer sensor life in
processes that will break or crack pH glass bulbs. By
allowing direct installation into the process, costs for
laboratory analysis of sample lines are greatly
reduced.
The TUpH Reference technology includes a large
area reference junction for minimum maintenance
requirements. The reference junction provides an
electrical connection between the reference electrode
and the sample, and helps maintain a stable refer-
ence potential, regardless of the change in sample
pH. The TUpH reference electrode junction (the
entire plastic tip surrounding the ISFET electrode)
maintains a steady reference signal, even in dirty
applications, by resisting plugging (a common cause
1.2 SPECIFICATIONS
Measurement Range: 2-12 pH
Measuring element: ISFET
Repeatability: ±0.05 pH
Response time to pH change: 99% in 30 seconds step change
Wetted Materials: Titanium, Polypropylene, EPDM, Ryton, Silicon
Process Connections: 1 in. MNPT front and rear facing threads
Temperature Range: 0 to 100°C (32 to 212°F) @ 50 psig
Pressure Range: -10 to 100 psig (32 to 790 kPa [abs]) at 50°C
Minimum Process Conductivity: 75 mS/cm; nominal: 100 mS/cm
Cable Lengths: 20 ft, 50 ft (6 m, 18 m)
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)
SECTION 1.0
of pH signal drift). This large reference junction area
(400 times greater than typical teflon or ceramic junc-
tions) is made of micron-sized reference pathways
allowing for ionic exchange but preventing plugging
by larger particles and will continue to send a steady
pH signal, even in the dirtiest of applications. The
field-proven TUpH reference junction technology
results in greatly reduced maintenance requirements.
The TUpH helical reference pathway resists reference
poisoning. Ions diffuse through the reference path-
ways and a charge is passed to the reference ele-
ment. The reference element must be protected from
contamination by poisoning ions such as sulfide, mer-
cury, cyanide, and ammonia that will cause reference
drift and offsets. The TUpH sensor's long internal ref-
erence pathway hinders the contaminants' migration
to the reference element thereby providing an
increased sensor life.
All TUpH sensor models have been specifically
designed for improved performance in harsh, dirty, or
abrasive applications where large quantities of sus-
pended solids are present.
The Model TF396 offers a watertight sensor-to-cable
connector that prevents cable twisting and eliminates
the need for rewiring when replacing the sensor. The
sensor cable includes an integral preamplifier cap
with mating connector and is compatible with most
Rosemount Analytical analyzers and transmitters.
SECTION 1.0
DESCRIPTIONS AND SPECIFICATIONS
1
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