Rosemount Analytical 399 Operating Manual
1.0 FEATURES AND APPLICATIONS
The Rosemount Analytical Model 399 Sensor measures
the pH or the Oxidation Reduction Potential (ORP) of
aqueous solutions in pipelines, open tanks, or ponds.
It is suitable for virtually all applications where a low
cost, disposable sensor is required. The combination
electrode features a ceramic junction constructed in
an annular design around the pH/ORP sensitive
membrane. The double junction reference cell configuration is resistant to process solutions containing
ammonia, chlorine, cyanides, sulfides, or other poisoning ions.
The glass electrode is housed in a molded Tefzel
®
1
body and sealed with Viton
®
1
O-rings to guard against
process leakage. The cable end of the sensor is also
sealed, eliminating cable shorts caused by exposure
to moisture. This construction makes for a highly
chemical resistant disposable sensor and does not
require electrolyte replenishment.
The custom glass electrode is available with either a
standard hemi bulb or an optional flat bulb to best
meet your application needs. Flat glass is advantageous in abrasive or coating applications that etch or
build up on the glass respectively. In coating applications, such as slurries, the flat surface allows the
process flow to act as a scrubbing agent to reduce
coating and maintenance whereas in abrasive applications pitting from silicates and other similar materials is minimized by the flat surface to provide longer
life. The hemi bulb is ideal for general purpose use
and for those processes requiring greater accuracy
over the entire pH range
The Rosemount Analytical pH/ORP sensor offers an
optional integral preamplifier to convert the high
impedance pH or ORP mV signal into a stable, noisefree signal with transmission capability of up to three
miles. The Rosemount Analytical preamp method has
become the industry standard for pH/ORP measurement reliability.
Installation is easily achieved through the wide variety
of mounting configurations. The Model 399 features
1 in. (MNPT) front and rear facing connections for
insertion, submersion or flow through pH and ORP
applications.
2.0 PHYSICAL SPECIFICATIONS
Materials of Construction: Tefzel
®
1
, glass, ceramic
and Viton
®
1
(also, Platinum for ORP sensor)
Process Connections: 1 in. MNPT
Interconnecting Cable: 5 conductor, 10 or 32 ft cable
undressed (integral preamp)
10 ft coax cable (Code 02, 09)
10 ft shielded coax cable (Code 04)
4 conductor, 20 or 100 ft cable undressed
(Code 12, 13, 33)
Measured Range: pH: 0-14
ORP: –1500 -+1500mV
Percent Linearity over pH range:
Temperature Compensation: Automatic 0 to 85°C
(32° to 185°F) (Temperature compensation is not
required for 399 ORP when used with Models 1060,
1023 or 1181 ORP)
Maximum Pressure: 790 kPa abs (100 psig) at 65°C
(Refer to Graph A on page 4)
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)
1
Tefzel and Viton are registered trademarks of DuPont Performance
Elastomers.
Model 399
Combination pH/ORP Sensor
Manual Instruction Sheet
PN 51-399/rev.K
November 2007
Hemi Bulb Flat Bulb
1-2 pH 94% 93%
2-12 pH 99% 98%
12-13 pH 97% 95%
3.0 UNPACKING. The sensor is shipped in a con-
tainer with special cushioning material. Before opening
the container, it should be inspected for any damage. If
any damage is detected, the carrier should be notified
before proceeding further. Carefully remove the sensor
from the container and packing material. Inspect the
sensor for any visible damage. If no damage is found,
carefully remove the rubber boot which protects the
glass electrode and keeps the liquid junction wetted.
NOTE
If the sensor is to be stored, the rubber boot
should be filled with pH buffer solution and
replaced on sensor tip until ready to use.
4.0 SENSOR PREPARATION. Shake down the
sensor to remove any air bubbles that may be present
at the tip of the pH glass bulb.
WARNING
Glass electrode must be wetted at all times
(in storage and in line) to maximize sensor
life.
5.0 CALIBRATION USING A STANDARD
BUFFER SOLUTION.
1. Make a temporary electrical connection between
the sensor and instrument.
2. Consult the appropriate pH or ORP analyzer/
transmitter instruction manual for the specific calibration and standardization procedure.
3. After successful completion of the calibration and
standardization procedure, install the Model 399
sensors in the process (see Figures 2 through 9).
6.0 INSTALLATION. The sensor has been
designed to be located in industrial process environments. Temperature and pressure limitations must not
be exceeded at any time (see Graph A).
6.1 Flow Through Installations. The Model 399
Sensor has a 1 in. MNPT process connection at the
front of the sensor for mounting directly into a 1-1/2 in.
tee. See Figure 2 for installation configurations. It is
recommended that shut-off valves be provided for sensor removal and service.
6.2 Insertion Installations. The Model 399 sensor has
forward and rear facing 1 in. MNPT process connections for pipeline installations utilizing flange connections. The Model 399 is also suitable for side-of-tank
installation. The Model 399 must be mounted 15°- 30°
above horizontal (see Figure 3).
6.3 Submersion Mounting. The Model 399 Sensor
has a 1 in. MNPT process connection at the back of the
sensor (see Figures 4 and 5). Utilizing a standard 1 in.
union, the sensor may be mounted to a 1 in. SCH 80
CPVC or PVDF standpipe. Tapered pipe threads in
plastic tend to loosen after installation. It is therefore
recommended that the tightness of the connection be
checked frequently to assure that no loosening has
occurred. To prevent rain water or condensation from
running into the sensor, a weatherproof junction box is
recommended (Rosemount Analytical PN 22719-02).
The sensor cable must be run through a protective
conduit for isolation from electrical interference or
physical abuse from the process. The sensor should
be installed within 80° of vertical, with the electrode
facing down. The sensor’s cable should not be run with
power or control wiring.
NOTE
LARGE PIPE WRENCHES MUST NOT BE
USED TO TIGHTEN THE SENSOR INTO A
FLANGE OR OTHER TYPE OF MOUNTING.
7.0 WIRING. The Model 399 has an optional built-in
preamplifier and comes standard with a shielded cable
or coax cable. The cable should be handled carefully
and kept dry and free of corrosive chemicals at all
times. Extreme care should be used to prevent it from
being twisted, damaged or scraped by rough, sharp
edges or surfaces. The cable is supplied undressed.
Please refer to Figures 10 through 28 or the applicable
analyzer/transmitter instruction manual for electrical
connections.
8.0 START-UP. After the sensor has been installed
and the process solution is in contact with the sensor,
the transmitter may need to be recalibrated. A grab
sample method is recommend. Please refer to your
analyzer/ transmitter’s instruction manual for procedure.
The Model 399pH has an automatic temperature compensator. This compensates for changes in the output
of the glass electrode with changes in temperature.
9.0 MAINTENANCE. The Model 399 Sensor is a
throw-away type and therefore requires a minimum of
maintenance. The sensor should be kept clean and
free of debris and sediment at all times. The frequency
of cleaning by wiping or brushing with a soft cloth or
brush is determined by the nature of the solution being
measured. The sensor should be removed from the
process periodically and checked in buffer solutions as
outlined in Section 5.0. If the sensor will not calibrate,
refer to your analyzer/ transmitter instruction manual
for proper test procedures. If it is determined that the
sensor has failed, it should be discarded and replaced.
2 Rosemount Analytical
MODEL 399 MANUAL INSTRUCTION SHEET
FIGURE 2. FLOW THROUGH INSTALLATIONS
FIGURE 3. INSERTION INSTALLATIONS
Rosemount Analytical 3
MODEL 399 MANUAL INSTRUCTION SHEET
1-1/2” SCHED 80
CPVC TEE WITH 1”
FNPT CONNECTIONS
(CODE 16) STRAIGHT
FLOW SHOWN
1-1/2” PIPE “Y”
1-1/2” X 1”
REDUCING
BUSHING
1-1/2” SCHED 80 CPVC
WITH VIEW OR
CLEANING PORT
FLOW
ANGLE FLOW
SHOWN
SENSOR SHOULD
ALWAYS BE
MOUNTED AT
LEAST 10° ABOVE
HORIZONTAL
SIDE-OF-TANK
INSTALLATION
PIPELINE INSTALLATION (WITH
FLANGE CONNECTIONS)
1” MNPT
FIGURE 1. MOUNTING AND DIMENSIONAL DRAWINGS
TEMP COMP
1” MNPT
1” MNPT
1” WRENCH
OPENING
pH
Dia
25
1
80
3.15
144
5.67
Option 71
Flat Glass Option
GRAPH A
PRESSURE/TEMPERATURE LIMITATIONS FOR MODEL 399*
*Please consult factory for specification, pricing and delivery information of Model 399, less integral preamp.
FIGURE 4. - SUBMERSION INSTALLATIONS
4 Rosemount Analytical
65 75 85 100
TEMPERATURE (°C)
100
80
60
40
20
PRESSURE (PSI)
MODEL 399 MANUAL INSTRUCTION SHEET
Submersion Installation Using a Remote Junction
Box, Mounting Bracket, and Pipe Mount Union
Accessory
Pipe supplied by customer and can be any length.
Submersion Installation Using the Handrail
Mounting Kit (PN 1000857)
Pull box, pipe, and coupling supplied by customer.
Junction box is sold separately.
Rosemount Analytical 5
MODEL 399 MANUAL INSTRUCTION SHEET
FIGURE 5. Submersion Installation Using the Handrail Mounting Assembly (PN 11275-01)
All parts shown are supplied; sensor is sold separately.
MILLIMETER
INCH
MODEL 399 MANUAL INSTRUCTION SHEET
FIGURE 6. Jet Spray Cleaner (PN 12707-00) for Submersion Installations
This accessory is especially useful for keeping the sensor clean in dirty ponds or tanks. It can be mounted using the Handrail
Mounting Assembly or a similar submersion accessory.
FIGURE 7. Sensor With Insertion Adapter (PN 23242-02)
This accessory fits the sensor into 1-1/2 inch threaded pipe tees.
The sensor can be removed easily and without twisting the sensor cable.
MILLIMETER
INCH
MILLIMETER
INCH
6 Rosemount Analytical
MODEL 399 MANUAL INSTRUCTION SHEET
FIGURE 8. Sensor Shown in Low Flow Cell Assembly (PN 24091-00)
Ideal for tapping into existing pipe lines or for minimal process flow requirements.
MILLIMETER
INCH
Rosemount Analytical 7
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