Emerson Model 328A Steam Sterilizable pH Electrode Instruction Sheet
Industry Manual Repository
Join the AnalyzeDetectNetwork and Read This Manual and Hundreds of Others Like It! It's Free!
Steam Sterilizable pH Electrode
Wetted Parts: Ceramic, silicone and glass
When not in process, immerse electrode’s measuring
tip in tap water or 5% KCl Solution.
For extended storage fill protective boot with tap
water or 5% KCl Solution and place over electrode’s
measuring tip. Store tip down.
Automatic Temperature Compensation:
Temperature compensation is generally not
required since most applications operate very
near pH 7 (isopotential point). When temperature
compensation is required a separate RTD can be
used with compatible instruments.
Electrode Grade 4 pH Buffer may be
used in place of 5% KCl Solution.
Process Connections: Standard 12 mm insertion
hardware (see Dimensional Drawing)
446 kPa abs at 130°C (50 psig at 266°F)
Remove electrode from shipping container.
Remove protective boot covering electrode’s
measuring tip (pH glass membrane).
Cable: 2-conductor, low-noise coax, 15 ft (4.5 m)
Wash away any salt film with clean water.
Weight/Shipping Weight: 100 gms/180 gms
(.2 lb/1.0 lb)
Shake internal solutions down to electrode’s
measuring tip. Electrode is now ready for sterilization
584 kPa abs at 80°C (70 psig at 176°F)
791 kPa abs at 40°C (100 psig at 104°F)
Performance: In typical applications, the Model
328A will perform continuously for 50 steam
Sensitivity: ± 0.02pH
Range: 0-13 pH:
1.67-4.01 pH 96% linearity
4.01-12.0 pH 99% linearity
12.0-13.0 pH 97% linearity
Repeatability: ± 0.05 pH
PN 22924-00 - 25mm Insertion Mounting
PN 9550154 - O-ring, 2-210 EP
Sensor requires sterilization prior to use.
NSTALLATION PROCEDURE (MODEL 328A WITH HOLDER ASSEMBLY)
A preamplifier is required for all applications using
a Rosemount transmitter.
To eliminate twisting the sensor cable, hold the
CAP stationary and rotate holder. When CAP is in
place, back it off 1/2 turn and pull the electrode
into place with cable. Retighten the CAP.
Locate kit containing sensor O-rings, (1) O-ring, spacer
and Lube package. Lube small O-rings and position,
with spacer, on sensor as illustrated in Figure 1.
Lube wire seal. Install with washer according to Figure 1.
Seal is split to facilitate installation when sensor cable is
equipped with spade lugs.
Slide the Bushing over cable and screw it into Holder as
tightly as possible by hand.
Slip 1-1/4 “ Threaded Nut over cable to O-ring (2). Lock
in place with External retaining ring.
Do not allow O-ring grease to come in contact
with glass electrode bulb.
Lube (1) O-ring and install on CAP end of Holder.
Locate Bushing kit with wire seal and washer, (2) O-ring,
and External retaining ring. Lube (2) O-ring and form the
wire seal end, work it into groove on Holder (See Figure 1).
Insert sensor, cable first, into holder from CAP end.
Slide the CAP over the sensor and screw tightly into place.
Sensor does not include preamplifier.
Performance of electrode will decrease with age and use.
Sluggishness, offsets, noisiness, and erratic reading may
indicate that electrode needs cleaning and soaking.
1. To remove oil deposits, clean electrode measuring tip
with mild, non-abrasive, detergent.
2. To remove scale deposits, soak electrode’s measuring
tip for 20-30 minutes in 10% hydrochloric acid.
Handle sensor with care to avoid glass electrode
breakage and exposure to sensor fill solution. KCl
sensor fill solution may cause skin and/or eye
irritation. Flush with water for a minimum of 15
minutes for eye exposure. Wash with soap and
water for skin exposure.
3. SHAKE INTERNAL SOLUTIONS DOWN to electrode’s
4. If electrode liquid junction appears to be clogged or dried
out, soak junction portion in 80°C 5% KCl solution for
one (1) hour. Leave electrode in solution while cooling.
FIGURE 1. INSTALLATION
FIGURE 2. DIMENSIONAL DRAWING OF MODEL 328A AND OPTIONAL MOUNTING ADAPTER
HARDWARE KIT (PN 22924-00)
FIGURE 3. WIRING MODEL 328A-08 SENSOR TO MODEL 1055-22-32 ANALYZER
The right people,
the right answers,
ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE
Specifications subject to change without notice.
Credit Cards for U.S. Purchases Only.
Emerson Process Management
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: (949) 757-8500
Fax: (949) 474-7250
© Rosemount Analytical Inc. 2005