Do not exceed temperature and pressure limitations of 266 °F (130 °C) and 43 psig (600 kPa, 4 bar).
WARNING!
HIGH PRESSURE AND TEMPERATURE HAZARD
Before removing the senosr, reduce the process pressure to 0 psig and cool down the process temperature.
Failure to reduce the pressure and temperature may cause serious injury to personnel.
WARNING!
CORROSIVE SUBSTANCE
Internal electrolyte solution may cause skin or eye irritation.
WARNING!
TOXIC AND CORROSIVE SUBSTANCE
Hydrofluoric acid and the mixture of hydrochloric acid and thiourea is toxic and highly corrosive. Avoid skin contact and wear
protective gloves. Use only in a well-ventilated area. Do not inhale fumes. In case of an accident, consult a doctor immediately.
CAUTION!
EQUIPMENT DAMAGE
The wetted sensor materials may not be compatible with process composition and operating conditions. Application compatibility is
entirely your responsibility.
Contents
Contents
Chapter 1 Plan ..................................................................................................................................1
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.
Plan
1.2Storage and handling
Proper storage and handling instructions of the electrodes must be followed to ensure
correct measurements.
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 Section 3.1 to properly
calibrate the sensors.
1.3Specifications
SpecificationsTable 1-1:
Hx338 pH Sensor SpecificationsMaterials and Units
Operating Temperature Range32 to 266 °F (0 to 130 °C)
Cable ConnectorSingle Pole S7 Connector Plug or VP6 Cable Connection
Minimum Conductivity of Sample50 µS/cm
Rosemount Hx338 pH Sensor1
Plan
2 Quick Start Guide
2Install
2.1Installing the sensor
Rosemount Hx338 dimensional drawingFigure 2-1:
Install
Rosemount Hx338 pH Sensor3
Install
A.VP 6.0 plug
B.
SW17 free spinning PG 13.5 thread
C.Washer
D.O-ring
Procedure
1.
Mount the sensor in a vertical pipe run with flow from top to bottom.
If the sensor must be mounted in a horizontal pipe run, orient the sensor in the or 9
o'clock position.
2.Orient the sensor within 80 ° of vertical. See Figure 2-2.
Sensor OrientationFigure 2-2:
3.Wire the sensor to the transmitter. See wiring diagrams below.
4 Quick Start Guide
Install
Rosemount Hx338-01-72 wiring to Rosemount 1066 TransmitterFigure 2-3:
Rosemount Hx338-01 wiring to Rosemount 1066 TransmitterFigure 2-4:
Rosemount Hx338 pH Sensor5
Install
Rosemount Hx338-01-72 wiring to Rosemount 5081 TransmitterFigure 2-5:
Rosemount Hx338-01 wiring to Rosemount 5081 TransmitterFigure 2-6:
6 Quick Start Guide
Install
Rosemount Hx338-01-72 wiring to Rosemount 1057 TransmitterFigure 2-7:
Rosemount Hx338-01 wiring to Rosemount 1057 TransmitterFigure 2-8:
Rosemount Hx338 pH Sensor7
Install
Figure 2-9:
Figure 2-10:
Rosemount Hx338-01-72 wiring to Rosemount 1056 and
Rosemount 56 Transmitters
Rosemount Hx338-01 wiring to Rosemount 1056 and Rosemount
56 Transmitters
8 Quick Start Guide
Calibration and maintenance
3Calibration and maintenance
3.1Two 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,
it is recommended that the electrode be replaced when the slope value falls below
47 to 49 mV/pH.
3.2Recommended 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.
Rosemount Hx338 pH Sensor9
Calibration and maintenance
10 Quick Start Guide
4Troubleshooting
4.1Cleaning or replacing the electrodes
Electrodes should respond rapidly. Sluggishness, offsets, and erratic readings are
indicators that the electrodes may need cleaning or replacement.
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).
Troubleshooting
4.2Accessories
Part numberDescription
24281-0015 ft (4.6 m) cable with mating VP8 connector
24281-0125 ft (7.6 m) cable with mating VP8 connector
24281-022.5 ft (0.8 m) cable with mating VP8 connector
24281-054 ft (1.3 m) cable with mating VP8 connector
24281-0610 ft (3 m) cable with mating VP8 connector
24281-0720 ft (6.1 m) cable with mating VP8 connector
24281-0830 ft (9.1 m) cable with mating VP8 connector
23645-0615 ft (4.6 m) cable with mating VP8 connector with BNC on transmitter end
23645-0715 ft (4.6 m) cable with mating VP8 connector with bare wires on transmitter end
91604943.3 ft (1 m) cable with AS7 connector, bare wire on analyzer end
916049516.4 ft (5 m) cable with AS7 connector, bare wire on analyzer end
916049632.8 ft (10 m) cable with AS7 connector, bare wire on analyzer end
916049816.4 ft (5 m) cable with AS7 connector, BNC on analyzer end
9160478Insertion assembly, 70 mm insertion, for 120 mm sensor, G 1-1/4 in.
916048315 degree weld-in socket, G 1-1/4 in. thread, 44 mm
9260484Service kit for insertion mounting assembly
The Emerson logo is a trademark and service mark of Emerson
Electric Co. Rosemount is a mark of one of the Emerson Process
Management family of companies. All other marks are the property
of their respective owners. The contents of this publication are
presented for information purposes only, and, while effort has been
made to ensure their accuracy, they are not to be construed as
warranties or guarantees, express or implied, regarding the
products or services described herein or their use or applicability.
All sales are governed by our terms and conditions, which are
available on request. We reserve the right to modify or improve the
designs or specifications of our products at any time without
notice.
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