Rosemount Analytical 399 Data sheet

Models 399 and 399VP

General Purpose pH/ORP Sensors

Product Data Sheet

PDS 71-399/rev.J
April 2009

1

Tefzel and Viton are registered trademarks of E.I. du Pont de Nemours and Co.

2

ACCUGLASS is trademark of Rosemount Analytical.

• SMART enabled

• NEW OPTIONS to meet a variety of applications requirements,
including: processes with low conductivity, hydrofluoric acid,
high pH, and reference poisoning elements

• VP8 QUICK CABLE-TO-SENSOR RELEASE, provided by the
watertight VP8 multiple-pin connector, eliminates cable twisting.

• EXTENDED SENSOR LIFE provided by double or triple
junction reference cell in process solutions containing
poisoning ions (special options).

• OPTIMUM VERSITILITY WITH VARIOUS MOUNTING OPTIONS
provided by one-piece construction with process threads in
two places.

• MAXIMUM CHEMICAL RESISTANCE provided by
rugged Tefzel

1

body, completely sealed to eliminate

sensor leakage.

• ENHANCED PERFORMANCE AND INCREASED LIFE
with minimized glass cracking provided by field-proven
A

CCUGLASS

®

2

pH glass formulations.

MODEL 399

Insertion/Submersion

Sensor with integral cable

MODEL 399VP

Insertion/Submersion Sensor

with new VP8 connector

(uses mating VP8 cable)

FEATURES AND APPLICATIONS

General purpose pH/ORP sensor model 399/399VP
is now offered with SMART capabilities. SMART

option becomes enabled when used with the Model 1056,
1057 Analyzers and on 6081P wireless transmitter. The pH-loop
capabilities include auto-recognition of the SMART sensor,
automatic upload of calibration data and associated time
stamp, historical recording of pH diagnostics (slope, offset,
reference impedance, glass impedance). This trending data
allows technicians to predict frequency of maintenance and
estimate sensor life for a particular process condition.
Additional SMART features include factory calibration,
resetting SMART sensor calibration data with user menus
without power cycling, and manufacturing information.

The reference junction aids in the sensor’s resistance
to poisoning ions and helps prolong sensor life. Models

399 and 399VP are provided with a double junction refer­ence, which protects the reference element from poisoning

ions — such as ammonia, chlorine, cyanides, and sulfides
— in the process. When large amounts of poisoning agents
are present, an optional triple junction may be ordered to
help prolong the sensor life. Both models, in either the dou­ble or triple reference configuration, are made with an outer
ceramic junction constructed in an annular design around
the pH/ORP-sensitive membrane.

The AccuG

LASS pH glass formulations exceed industry

standards. The AccuGlass pH glass is a result of many

years of glass research resulting in a formulation which has
been found to increase the life of the sensor. Unlike other
pH glasses presently on the market, this glass resists crack­ing especially at higher temperatures and reduces sodium
ion error commonly found in high pH applications. Overall,
the AccuGlass formulation enhances the sensor perform­ance to measure pH more accurately and have a longer
sensor life than ever before.

FEATURES AND APPLICATIONS (cont.)

A choice of pH glass electrodes is available to best
meet various application needs. Four types are avail-

able: hemi bulb, flat bulb, HF resistant, and Hi pH glass.
The A

CCUGLASS hemi bulb is the standard glass offered

on both models and can be used for most applications.
The hemi bulb is also found on the HF resistant and Hi pH
glass options. The A

CCUGLASS flat glass option can be

used in abrasive or coating applications that etch or build
up on glass, respectively.

NEW - SMART is standard option. A preamplifier converts
the high impedance pH signal into a stable, noise-free
signal and must be used with all pH sensors. The Model
399/399VP offers the Models 399-10, 399-14, 399-34 and
399VP (-70) with an integral SMART preamplifier. Other
Models can use a remote preamplifier, integral to the
analyzer/transmitter or in a remote junction box. All pre­amplifiers have a transmission capability of up to three
miles.The Rosemount Analytical preamplifier method has
become the industry standard for pH/ORP measurement
reliability.

Model 399VP is offered with a watertight sensor-to­cable connector which eliminates re-wiring and cable
twisting when replacing sensors. The Variopol VP multi-

ple pin connector is an integral part of each sensor model
and uses a mating VP cable; see page 5 for example.
Once the cable is installed and wired to the analyzer,
sensors are easily replaced without replacing the cable
and without rewiring the analyzer. Also the cable can be
disconnected from the sensor before removal from the
process which eliminates cable twisting. VP8 cable
assembly works with both VP8 and VP6 sensor connector.

Models 399 and 399VP are housed in a molded Tefzel
body with Viton o-rings, making each sensor virtually
indestructible and chemically resistant. Complete

encapsulation eliminates leakage or high humidity prob­lems traditionally found in other pH/ORP designs. The
simplified construction, designed with user convenience
in mind does not require electrolyte (KCl) replenishment
or any high maintenance troubleshooting procedures.

Installation is easily achieved through the wide variety
of mounting configurations. Both Models feature 1 inch
(MNPT) front and rear facing connections for insertion,
submersion, or flow-through pH and ORP applications.

New options are available for special application
needs, including high purity/low conductivity water, heavy

reference poisoning, and continuous high or low tempera­ture processes. Consult the factory or your local sales
representative for more details on these new options.

PHYSICAL PERFROMANCE AND
SPECIFICATIONS

Sensor Type:: General purpose 399, 399VP
Measured Range: pH: A

CCUGLASS 0-14

ORP: -1500 to +1500 mV

Percent Linearity Over pH Range:

Operating Temperature: 0° to 85°C (32° to 185°F)

Automatic temperature compensation 0° to 85°C (32°
to 185°F), Temperature compensation is not required
for 399 ORP when used with Models 1060, or 1181
ORP

Maximum Pressure: 790 kPa [abs] (100 psig) at 65°C (see

Graph 1 below)

Flow Rate: up to 2 ft/sec
Materials of Construction: Tefzel, glass, ceramic, & Viton
Materials of ORP: Platinum
Process Connections: 1 in. MNPT, 2 places
Integral Cable: 10 or 32 ft cable with integral preamp

(remote preamp) 10 ft cable with remote preamp

VP8 Cable: use PN 24281-00
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)

• High pH glass provides greater accuracy over 12.5 pH

• HF glass provides improved resistance to hydrofluoric
acid up to 300 ppm

GPLR Hemi Bulb Flat Bulb

1-2 pH 94% 93%

2-12 pH 99% 98%

12-13 pH 97% 95%

13-14 pH 92% –

GRAPH 1. Pressure/Temperature Operating Range

for Models 399 and 399VP

2

Both models are combination sensors (pH, reference, and
temperature within sensor body) and measure pH or ORP

(Oxidation/Reduction Potential) of aqueous solutions in
pipelines, open tanks, or ponds. Models 399 and 399VP are
suitable for virtually all applications and are compatible with
Rosemount Analytical and other manufacturers’ instruments.

3

DIMENSIONAL DRAWINGS FOR MODEL 399

TEMP COMP

1 IN. MNPT

1 IN. MNPT

1 IN. WRENCH
OPENING

pH

Dia

25

1

80

3.15

144

5.67

Option -71

Flat bulb sensor

MILLIMETER

INCH

DIMENSIONAL DRAWING FOR MODEL 399VP

MILLIMETER

INCH

PN 24281-00