Rosemount Hx338+ Steam Sterilizable and Autoclavable Pre-Pressurized pH Sensor Quick Start Guide

Quick Start Guide

00825-0100-3338, Rev AA

June 2019

Rosemount™ Hx338+

Steam Sterilizable and Autoclavable Pre­Pressurized pH Sensor

Quick Start Guide June 2019

Essential instructions

Read this page before proceeding!

Emerson designs, manufactures, and tests its RosemountTM products to meet many national and
international standards. Because these instruments are sophisticated technical products, you must
properly install, use, and maintain them to ensure they continue to operate within their normal
specifications. The following instructions must be adhered to and integrated into your safety program
when installing, using, and maintaining Rosemount products. Failure to follow the proper instructions
may cause any one of the following situations to occur: loss of life, personal injury, property damage,
damage to this instrument, and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing this product. If this instruction

manual is not the correct manual, call 1-855-724-2638, and we will provide the requested
manual. Save this manual for future reference.

• If you do not understand any of the instructions, contact your Emerson representative for

clarification.

• Follow all warnings, cautions, and instructions marked on and supplied with the product.

• Inform and educate your personnel in the proper installation, operation, and maintenance of the

product.

• Install your equipment as specified in the installation instructions of the appropriate manual and

per applicable local and national codes. Connect all products to the proper electrical and pressure
sources.

• To ensure proper performance, use qualified personnel to install, operate, update, program, and

maintain the product.

• When replacement parts are required, ensure that qualified people use replacement parts

specified by Rosemount. Unauthorized parts and procedures can affect the product's
performance, place the safe operation of your process at risk, and VOID YOUR WARRANTY. Look
alike substitutions may result in fire, electrical hazards, or improper operation.

• Ensure that all equipment doors are closed and protective covers are in place, except when

maintenance is being performed by qualified people, to prevent electrical shock and personal
injury.

Contents

Plan..............................................................................................................................................3

Install........................................................................................................................................... 8

Wiring.......................................................................................................................................... 9

Calibrate.................................................................................................................................... 15

Maintaining and troubleshooting............................................................................................... 17

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June 2019 Quick Start Guide

1 Plan

1.1 Electrode preparation

Procedure

1. Remove electrode from shipping container.

2. Remove the protective boot covering the electrode bulb.

3. Rinse away salt film with clean water and then shake the electrode so
that the internal solution fills the bulb, thus removing any air trapped
there.

Note

Do not allow lubricant to coat electrode bulb or reference junction. If
it does, wipe it clean before installation.

1.2 Storage and handling

Proper storage and handling instructions of the electrodes must be followed
to ensure correct measurements.

Procedure

1. Store the electrodes in their original shipping containers until
needed.

2. Do not store at temperatures below -5 °C (23 °F).

3. Store the electrodes with a protective cap containing KCI solution
(PN 9210342).

4. For overnight storage, immerse the sensor in tap water or 4 pH
buffer solution.

5. Use the startup and calibration procedure described in Two point

buffer calibration to properly calibrate the sensors.

6. The standard sensor shelf life is one year from manufacturing date.
Follow the refresh procedure described in Electrode refresh

procedure at one year and eighteen months to extend the shelf life

to a maximum of two years.

1.3

Table 1-1: Rosemount™ Hx338+ Sensor Specifications

Specifications Materials and units

Operating temperature range 32 to 283 °F (0 to 140 °C)

Pressure range 0 to 6 bar

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Specifications

Quick Start Guide June 2019

Table 1-1: Rosemount™ Hx338+ Sensor Specifications (continued)

Specifications Materials and units

pH range 0 to 14

Measuring method

Combination electrode pH potential measured against reference

Wetted materials

pH electrode Glass

O-ring EPDM (FDA approved)

Operations parameters

Process connection PG 13.5

Electrical connector Variopol (VP 6.0)

Minimum conductivity of sample 100 µS/cm

Zero-point 0 ±20 mV

Sensitivity 57 to 59 mV / pH at 77 °F (25 °C)

Electrolyte Pressurized

Temperature sensor Pt-100

electrode

WARNING

Pressure and temperature

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!

Do not exceed temperature and pressure limitations of 284 °F (140
°C) and 6 bar.

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WARNING

Corrosive substance

Hydrofluoric acid and the mixture of hydrochloric acid and thiorea is toxic
and highly corrosive.

Avoid skin contact; wear protective gloves.
Use only in a well-ventilated area.
Do not inhale fumes.
In case of an accident, consult a doctor immediately.

CAUTION

Sensor/process application compatibility

The wetted sensor materials may not be compatible with process
composition and operating conditions.

Application compatibility is entirely the operator's responsibility.

1.4 Rosemount™ Hx338+ Sensor design specifications

See Figure 1-1 for sensor dimensions.

Quick Start Guide 5

Quick Start Guide June 2019

Figure 1-1: Rosemount Hx338+-01-72 Dimensional Drawing

A. VP 6.0 plug
B. SW-19 free spinning PG13.5 screw thread
C. Washer

D. O-ring

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June 2019 Quick Start Guide

1.5 Rosemount Hx338+ pH Sensor ordering information

Table 1-2: Rosemount Hx338+ pH Sensor Ordering Information

Model Sensor type

Hx338+ pH Sensor

Sensor length

01 4.8 in. (120 mm)

Cable connection

72 Pt-100 RTD with Variopol (VP6) Connector (Requires accessory

Typical model number: Hx338+-01-72

Table 1-3: Accessories

Part number Description

24281-00 15 ft (4.6 m) VP8 cable

24281-01 25 ft (7.6 m) VP8 cable

24281-02 2.5 ft (0.8 m) VP8 cable

24281-05 4 ft (1.2 m) VP8 cable

24281-06 10 ft (3.0 m) VP8 cable

24281-07 20 ft (6.1 m) VP8 cable

24281-08 30 ft (9.1 m)VP8 cable

Mounting accessories

Part number Description

9160478 Insertion assembly, 2.75 in. (70 mm) insertion, for 4.72 in. (120 mm)

sensor, G 1-1/4 in.

9160483 15 degree weld-in socket, G 1-1/4 in. thread, 44 mm

9160484 Service kit for insertion mounting assembly

Other accessories

Part number Description

9210012 Buffer solution, pH 4.01, 16 oz

9210013 Buffer solution, pH 6.86, 16 oz

9210014 Buffer solution, pH 9.18, 16 oz

mating cable)

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Quick Start Guide June 2019

2 Install

2.1 Install the sensor

Procedure

1. Mount the sensor in a vertical pipe run with flow from bottom to top.
If the sensor must be mounted in a horizontal pipe run, orient the

sensor in the 3 o'clock or 9 o'clock position.

2. Orient the sensor within 80 ° of vertical. See Figure 2-1.

Figure 2-1: Sensor Orientation

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June 2019 Quick Start Guide

3 Wiring

3.1 Wire the Rosemount™ Hx338+ Sensor

Use the following wiring diagrams to wire the sensor to the Rosemount 56,
Rosemount 1056, Rosemount 1057, Rosemount 1066, and Rosemount
5081 transmitters.

Procedure

1. See Figure 3-1 to wire the Rosemount Hx338+ Sensor to the
Rosemount 56, 1056, or 1057 Transmitter.

Quick Start Guide 9

Quick Start Guide June 2019

Figure 3-1: Wire the Rosemount Hx338+ Sensor to the
Rosemount 56, 1056, or 1057 Transmitter

A. Cap clear inner drain
B. White
C. White/red

D. Red

E. Cap blue wire

F. Clear
G. Orange
H. Gray/white

I. Gray
J. Green

K. Resistance temperature device return

L. Resistance temperature device sense

M. Resistance temperature device in

N. Ground
O. +5 Vdc

P. -5 Vdc

Q. pH shield

R. pH in

S. Reference shield

T. Reference

U. Jumper

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2. See Figure 3-2 to wire the Rosemount Hx338+ Sensor to the
Rosemount 1066 Transmitter.

Figure 3-2: Wire the Rosemount Hx338+ Sensor to the
Rosemount 1066 Transmitter

A. Resistance temperature device return
B. Resistance temperature device sense
C. Resistance temperature device in

D. -Volts

E. +Volts

F. Cap green wire
G. White
H. White/red

I. Red
J. Gray

K. Gray/white

L. Cap blue wire

M. Clear

N. Orange
O. Cap inner drain clear

P. Reference in

Q. Reference shield

R. Solution ground

S. pH shield

T. pH in

U. Jumper

Quick Start Guide 11

Quick Start Guide June 2019

3. See Figure 3-3 to wire the Rosemount Hx338+ Sensor to the
Rosemount 5081 Transmitter.

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Figure 3-3: Wire the Rosemount Hx338+ Sensor to the
Rosemount 5081 Transmitter

A. Reserved
B. Reserved
C. Resistance temperature device return

D. Resistance temperature device sense

E. Resistance temperature temperature device in

F. Reference guard
G. Reference in
H. Jumper

I. Solution ground
J. pH/ORP guard

K. pH/ORP in

L. -5 V

M. +5 V

N. Anode/reserved
O. Cathode/reserved

P. HART®/FOUNDATION™ Fieldbus (-)

Q. HART/FOUNDATION Fieldbus (+)

R. White

S. White/red

T. Red

U. Gray/white

V. Gray

W. Cap blue wire

X. Clear

Quick Start Guide 13

Quick Start Guide June 2019

Y. Orange

Z. Cap clear inner drain
AA. Green
AB. Hook to chassis

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4 Calibrate

4.1 Two point buffer calibration

Prerequisites

Select two stable buffer solutions, preferably pH 4.0 and 7.0 (pH buffers
other than pH 4.0 and pH 7.0 can be used as long as the pH values are at
least two pH units apart).

Note

A pH 7.0 buffer solution reads an mV value of approximately zero, and pH
buffers read approximately ±59.1 mV for each pH unit above or below pH

7.0. Check the pH buffer manufacturer specifications for millivolt values at
various temperatures, as it may affect the actual value of the buffer solution
mV/pH value.

Procedure

1. Immerse sensor in the first buffer solution. Allow sensor to
equilibrate to the buffer temperature (to avoid errors due to
temperature differences between the buffer solution and sensor
temperature) and wait for reading to stabilize.

The value of the buffer can now be acknowledged by the transmitter.

2. Once the first buffer has been acknowledged by the transmitter,
rinse the buffer solution off of the sensor with distilled or deionized
water.

3. Repeat steps 1 and 2 using the second buffer solution.
The theoretical slope value, according to the Nernst equation for

calculating pH, is approximately 59.17 mV/pH. Over time the sensor
will age, both in the process and in storage, and this will result in
reduced slope values. To ensure accurate readings, Emerson
recommends replacing the electrode when the slope value falls
below 47 to 49 mV/pH.

4.2

Quick Start Guide 15

Recommended pH sensor standardization

For maximum accuracy, the sensor can be standardized on-line or with a
process grab sample after a buffer calibration has been performed and the
sensor has been conditioned to the process. Standardization accounts for
the sensor junction potential and other interferences. Standardization will
not change the sensor’s slope, but will simply adjust the transmitter’s
reading to match that of the known process pH.

Quick Start Guide June 2019

4.3 Electrode refresh procedure

The pressurized electrode in the Rosemount™ Hx338+ has a storage life of
one year without an electrode refresh. At one year of shelf life, all sensors
should be refreshed for peak performance. Please follow this procedure for
refreshing the sensor.

Prerequisites

Select the two refresh solutions. A 0.4-4% by weight sodium hydroxide
(NaOH) solution for a base and a 0.73-3.65% by weight hydrochloric acid
(HCl) solution for an acid are recommended. Also, a potassium chloride (KCl)
solution is needed for cleaning and storage.

Record the sensor serial number, lot number, and date of manufacturing on
a worksheet. Remove sensor from the package. Inspect the connection,
electrode, and glass for any defects or scratches and remove the cap by
relieving the rubber gasket.

Procedure

1. Clean the sensor with water; bottled or mineral water is
recommended.

2. Place the sensor electrodes into the NaOH solution for 10 minutes.

3. Rinse the electrodes with water.

4. Place the electrodes into the HCl solution for 10 minutes.

5. Rinse the electrodes with water.

6. Place the electrodes into the KCl solution for a minimum of 60
minutes.

Zero and calibrate the sensor, following the procedure highlighted in

Section, after the refresh procedure and replace the cap with fresh KCl

solution covering the sensor bulb and reference junction.

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June 2019 Quick Start Guide

5 Maintaining and troubleshooting

5.1 Cleaning or replacing the electrodes

Electrodes should respond rapidly. Sluggishness, offsets, and erratic
readings are indicators that the electrodes may need cleaning or
replacement.

Procedure

1. Use a mild non-abrasive detergent to clean and remove oil deposits
from the electrode.

2. Soak electrodes for 30 to 60 minutes in a 5% hydrochloric acid
solution to remove scale deposits.

Temperature effect on life expectancy: If glass electrode life
expectancy is 100% at 25 °C (77 °F), then it will be approximately 25%
at 80 °C (176 °F), and approximately 5% at 120 °C (248 °F).

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Quick Start Guide 19

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*00825-0100-3338*

Quick Start Guide

00825-0100-3338, Rev. AA

June 2019

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