Rosemount Quick Start Guide: Hx438 Sensor Amperometric Steam Sterilizable Dissolved Oxygen Sensors | Rosemount Manuals & Guides

Quick Start Guide

00825-0100-3494, Rev AA

June 2019

Rosemount™ Hx438

Amperometric Steam Sterilizable Dissolved
Oxygen Sensors

Quick Start Guide June 2019

Safety Information

WARNING

High pressure and temperature

Failure to reduce the pressure and temperature may cause serious injury to personnel.

Before removing the sensor, reduce the process pressure to 0 psig and cool down the process
temperature.

Do not exceed temperature and pressure limitations of 266 °F (130 °C) and 43 psig (400 kPa, 4
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.

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June 2019 Quick Start Guide

1 Plan

1.1 Unpack and inspect

Procedure

1. Inspect the outside of the carton for any damage.

2. If damage is detected, contact the carrier immediately.

3. Inspect the hardware.

4. Make sure all the items in the packing list are present and in good
condition.

5. Notify the factory if any part is missing.

1.2 Specifications

Table 1-1: Rosemount Hx438 dissolved oxygen sensor specifications

Hx438 Dissolved Oxygen Sensor Material and Units

Operating Temperature Range 32 to 266 °F (0 to 130 °C)

Maximum Pressure 43 psig (400 kPa abs, 4 bar)

Measurement Range 0 to 20 ppm or 0 to 250% saturation,

Wetted Materials Stainless steel and EPDM

Process Connections PG 13.5 thread

Cable Connector Standard 4-pin

Cable Compatibility Standard 4-pin connector cable

Compatible Mounting Accessory Insertion Mounting Assembly

Compatible Transmitters Rosemount Transmitter Models 56,

Temperature Compensation 22K NTC

depending on instrument

1056, 5081, and 1066

Quick Start Guide 3

Quick Start Guide June 2019

2 Install

2.1 Preparing the sensor

Procedure

1. Remove the plastic cap carefully which covers the sensing end of
sensor.

2. Avoid causing a vacuum by gently and slowly twisting the sensor and
cap until it is removed.

3. Sensor is shipped dry, so electrolyte must be added prior to
installation.

4. Remove membrane cartridge.

5. Add 1.5 ml of electrolyte to the membrane cartridge.

6. Screw membrane cartridge back onto sensor body.

2.2 Connecting the sensor to the trasmitter

Procedure

1. Wire the sensor to the transmitter.

2. Apply power to the transmitter.

3. Make the sensor ready for calibration after two hours.
The polarization time is necessary to get stable signals from the

sensors

4. If the sensor is disconnected from the transmitter for a short time,
allow the sensor to stabilize for at least two times longer than the
time was disconnected.

Time needed for stabilization should not exceed two hours.

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June 2019 Quick Start Guide

2.3 Mount the sensor

Procedure

Use PG 13.5 process thread to mount the sensor.

NOTICE

Do not install the sensor upside down.

Quick Start Guide 5

Quick Start Guide June 2019

Figure 2-1: Dimensional Drawing for Rosemount Hx438-01

A.

Sensor part number

Hx438-01 4.725 120

B. 4-pin connector
C. Free rotating PC 13.5 screw thread

D. O-ring

2.4

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Wire the sensor to the transmitter

Procedure

Wire the sensor to the transmitter.
See wiring diagrams below.

A dimension

in. mm