Rosemount Analytical 3900 Specifications
Rosemount™ 3900/3900VP
General Purpose pH/ORP Sensors
Product Data Sheet
June 2017
LIQ-PDS-3900
High performance for your process pH/ORP needs
The Rosemount 3900 and 3900VP pH/ORP combination sensors are used for reliable pH or oxidation/reduction potential
measurements of aqueous solutions in pipelines, open tanks, or ponds. Its robust sensor design allows the Rosemount 3900 and
3900VP sensors to be used in a wide range of applications.
Rosemount 3900/3900VP General Purpose pH/ORP Sensors
Overview
A Robust Sensor Design
Extended sensor life and protection against poisoning ions
using a double junction reference.
Enhanced performance and increased life with cracking
resistant glass.
Maximum chemical resistance provided by a rugged
polyphenylene sulfide body.
Operates in sub-zero temperatures down to 14 °F (-10 °C).
Built-in solution ground for advanced diagnostics.
Versatile Installation Options
The sensor body features a one-piece construction with both
front facing and rear facing process threads.
June 2017
Contents
¾ in. and 1 in. MNPT process connections to meet a variety of
application installation requirements.
Variopol (VP8) cable connection option, for quick
cable-to-sensor release, eliminates cable twisting.
SMART Preamplifier
Automatic recognition of pH sensors by Rosemount
transmitters: 1066, 1057, 1056, and 56
pH calibration data is stored which allows sensors to be
calibrated in advance for “Plug and Play” installations in the
field.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
Product Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Dimensional and Installation Drawings . . . . . . . . . . . . . . 6
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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June 2017
Rosemount 3900/3900VP General Purpose pH/ORP Sensors
Ordering Information
The Rosemount 3900 and 3900VP General Purpose pH/ORP Sensors feature a
chemically resistant Ryton plastic body, along with a built-in solution ground for
advanced diagnostics and a Pt-100 RTD for temperature compensation. These sensors
are available with either an integral cable connection (3900) or Variopol (VP8)
connector (3900VP). Variopol cables are sold separately (see
Table 1. Rosemount 3900 pH/ORP Sensor ordering information
Model Sensor Type
3900 pH/ORP sensor
Preamplifier Option
01 Preamplifier
02 No preamplifier
(1)
(2)
Accessories ).
Measuring Electrode
10 General Purpose Low Resistivity (GPLR) pH glass
12 Platinum ORP
Typical Model Number: 3900-01-10
1. Preamplifier is SMART with -10 option and a standard preamplifier if with -12 option. Comes with 32 ft. (10 m) of integral cable.
2. Comes standard with 15 ft. (4.7 m) of integral cable.
Table 2. Rosemount 3900VP pH/ORP Sensor with Variopol cable connection ordering information
Model Sensor Type
3900VP pH/ORP sensor
Preamplifier Option
01 Preamplifier
02 No preamplifier
(1)
Measuring Electrode
10 General Purpose Low Resistivity (GPLR) pH glass
12 Platinum ORP
Typical Model Number: 3900VP-01-10
1. Preamplifier is SMART with -10 option and a standard preamplifier if with -12 option.
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3
Rosemount 3900/3900VP General Purpose pH/ORP Sensors
Specifications
Table 3. Percent linearity over pH range
June 2017
pH Range
Linearity
0-7 1-7 4-7 7-10 7-12 7-13 7-14
97% 98% 98% 99% 97% 96% 95%
Table 4. Rosemount 3900/3900VP pH/ORP Sensor specification
Measurement Range
pH 0 to 14
ORP -1500 to +1500 mV
Operating Temperature
-10 to 100 °C (14 to 212 °F), Automatic temperature compensation from -10 to 100 °C (14 to 212 °F)
Maximum Pressure
100 psig (790 kPa [abs]) at 100 °C (212 °F)
CRN Rating: 60 psig up to 100 °C (212 °F)
Materials of Construction
Sensor Body Ryton - Polyphenylene Sulfide (PPS)
O-ring EPDM
pH Electrode Glass
ORP Electrode Glass, platinum
Solution Ground Stainless steel
Reference Junction PTFE (Teflon)
Conductivity
Responds to changes in pH at a minimum conductivity of 0.1 μS/cm when used with the low flow panel. The sample flow rate must
be controlled to 2 GPH (7.6 L/hr)
Process Connection
Front Facing ¾ in. and 1 in. MNPT
Rear Facing 1 in. MNPT
Temperature Compensation
Pt-100
Cable
3900 32 ft (10m) cable with integral preamplifier; 15 ft (4.7m) cable without preamplifier
3900VP Use 24281-XX, 2.5 ft (.8m) to 100 ft (31m) (see
Accessories )
Weight/Shipping Weight
0.45 kg/0.9 kg (1 lb/2 lb)
4
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