Rosemount Analytical Gx448 Operating Manual
Models Hx438 and Gx448
Dissolved Oxygen Sensors
Instruction Sheet
PN 51A-HxDO/rev.F
June 2008
1.0 SPECIFICATIONS
Temperature Range: -10 to 130°C (14 to 266°F)
Maximum Pressure: 43 psig (400 kpa abs, 4 bar)
Measurement Range: 0 to 20 ppm or 0 to 250% saturation, depending on instrument
Wetted materials: Stainless Steel (type AISI-ASTM 316 Ti; DIN 1.4571) and EPDM
Process connections:
Model Hx438: PG 13.5 thread
Model Gx448: G 1-1/4 in. Thread
Cable Connector: 4-pin
Cable Compatibility: Standard 4-pin connector cable
Compatible Analyzers: Rosemount Analytical Models, 1055, 1056, 54eA, XMT, and 5081
Compatible Mounting Accessory:
Model Hx438: Insertion or Retractable Mounting Assembly
Model Gx448: None, mounts directly to the 61mm, G 1-1/4 in. weld-in socket (PN 9160504)
For additional information, please refer to the Instruction Manuals CD shipped with this
product, or 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
WARNING
Do not exceed temperature and pressure limitations
of 130°C (266°F) and 72 psig (600 kpa abs, 6 bar).
WARNING
The electrolyte is highly alkaline. Protect your hands
with gloves and use safety goggles. Avoid contact of
the electrolyte with the skin, eyes, and mucous
membranes
2
2.0 INSTALLATION
2.1 UNPACKING AND INSPECTION
Inspect the carton for damage. If damage is found, contact the carrier immediately.
2.2 SENSOR PREPARATION
Sensor Preparation Guidelines: Carefully remove the plastic cap covering the sensing end of the sensor. Avoid
causing a vacuum by gently and slowly twisting the sensor and cap until it is removed. Sensor is shipped dry, so
electrolyte must be added prior to installation.
Remove membrane cartridge. Add 1.5 ml of electrolyte to the membrane cartridge. Screw membrane cartridge
back onto sensor body. Refer to Section 5.3 for additional details.
Connection of the Sensor to the Analyzer/ Transmitter:
1. Wire the sensor to the analyzer/transmitter. See the wiring tables in Section 3.0.
2. Apply power to the analyzer/transmitter. After 2 hours, the sensor should be ready for calibration. The polarization time is necessary to get stable signals from the sensor. If the sensor is disconnected from the analyzer/transmitter for a short time, allow the sensor to stabilize for at least two times longer than the time is was disconnected. Time needed for stabilization should not exceed 2 hours.
Mounting Guidelines: Mount the sensor using the PG 13.5 process thread (Model Hx438) or the G 1-1/4 inch
thread (Model Gx448).
NOTE
Do not install the sensor upside down.
MILLIMETER
INCH
MILLIMETER
INCH
MODEL Gx448
MODEL Hx438
3
3.0 WIRING
Wiring Model Hx438 and Gx448 Sensors
to Model 54eA Analyzer
Hx438 and Gx448 steam-steriliz-
able dissolved oxygen sensors
use a 22k NTC thermistor. The
thermistor is wired to terminals
1 and 3 on TB5.
Wiring Model Hx438 and Gx448 Sensors to
Model 5081-A Analyzer
Wiring Model 1056 Wiring diagram to Hx438
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