Rosemount 3900, 3900VP Product Data Sheet

Rosemount™ 3900/3900VP

General Purpose pH/ORP Sensors

Product Data Sheet

00813-0100-3900, Rev AB

October 2019

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 October 2019

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-ins 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.

■

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.

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 resistance temperature device (RTD) for
temperature compensation. These sensors are available with
either an integral cable connection (Rosemount 3900) or
Variopol (VP8) connector (Rosemount 3900VP). Variopol cables
are sold separately (see Accessories).

Contents

Overview........................................................................................................................................................................................... 2

Ordering information........................................................................................................................................................................ 2

Specifications.................................................................................................................................................................................... 4

Dimensional and installation drawings.............................................................................................................................................. 5

Accessories......................................................................................................................................................................................16

2 Emerson.com/Rosemount

October 2019 Rosemount 3900/3900VP

Table 1: Rosemount 3900 Ordering Information

Option Description

3900 General Purpose pH/ORP Sensor

Preamplifier option

01 SMART preamplifier, 32-ft. (10 m) cable (standard preamplifier if used with ORP)

02 No preamplifier, 15-ft. (5 m) cable

04 SMART preamplifier, 50-ft. (15 m) cable (standard preamplifier if used with ORP)

05 SMART preamplifier, 66-ft. (20 m) cable (standard preamplifier if used with ORP)

06 SMART preamplifier, 100-ft. (30 m) cable (standard preamplifier if used with ORP)

07 No preamplifier, 4-ft. (1 m) cable

08 No preamplifier, 10-ft. (3 m) cable

Measuring code

10 General purpose low resistivity (GPLR) pH glass (0-14 pH)

12 Platinum ORP

Calibration certificates - optional level

CC Certificate of Calibration (no test data given)

LC Loop Calibration Certificate (sensor and transmitter calibrated together, with test

data)

EC Electronic Calibration Certificate (sensor calibrated against factory instrument, with

test data)

Note

The Rosemount 3900 pH/ORP sensor is housed in a Ryton plastic body with built-in solution ground for advanced diagnostics.
Pt-100 is offered for a temperature compensator. The sensor is available with an integral cable. You can mount the sensor using a
process connector, both ordered separately. You can also order junction box kits with preamplifiers separately if the transmitter
does not have an integral preamplifier with 15 ft. (5 m) of the sensor.

Table 2: Rosemount 3900VP Ordering Information

Option Description

3900VP General Purpose pH/ORP Sensor with Variopol connector

Preamplifier option

01 SMART preamplifier (standard preamplifier if used with ORP)

02 No preamplifier

Measuring code

10 General purposel low resistivity (GPLR) pH glass (0-14 pH)

12 Platinum ORP

Calibration certificates - optional level

CC Certificate of Calibration (no test data given)

LC Loop Calibration Certificate (sensor and transmitter calibrated together, with test

data)

Rosemount 3900/3900VP 3

Rosemount 3900/3900VP October 2019

Table 2: Rosemount 3900VP Ordering Information (continued)

Option Description

EC Electronic Calibration Certificate (sensor calibrated against factory instrument, with

test data)

Specifications

Table 3: Percent Linearity over pH Range

pH range Linearity

0-7 97%

1-7 98%

4-7 98%

7-10 99%

7-12 97%

7-13 96%

7-14 95%

Table 4: Rosemount 3900/3900VP pH/ORP Sensor Specifications

Measurement range

pH 0 to 14

ORP -1500 to +1500 mV

Operating temperature

14 to 212 °F (-10 to 100 °C), automatic temperature compensation from 14 to 212 °F (-10 to 100 °C)

Maximum pressure

100 psig (790 kPa [abs]) at 212 °F (100 °C)
CRN rating: 60 psig up to 212 °F (100 °C)

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 PFTE (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 gallons per hour (7.61 liters per hour).

Process connection

Front facing ¾-in. and 1-in. MNPT

4 Emerson.com/Rosemount

October 2019

Table 4: Rosemount 3900/3900VP pH/ORP Sensor Specifications (continued)

Rear facing 1-in. MNPT

Temperature compensation

Pt-100

Cable

3900 Various cable lengths (see Ordering information) with integral preamplifier; 15-ft.

(4.6 m) and less without preamplifier

3900VP Use 24281-XX, 2.5-ft. (0.8 m) to 100 ft. (30.5 m). See Accessories.

Weight/shipping weight

1 lb./2 lb. (0.45 kg/0.9 kg)

Rosemount 3900/3900VP

Dimensional and installation drawings

Figure 1: Proper Sensor Installation Orientation

Install sensor within 80 degrees of vertical.

Rosemount 3900/3900VP 5

Rosemount 3900/3900VP

Figure 2: Rosemount 3900 with Integral Cable Connection

October 2019

A. 1-in. MNPT
B. Wrench flats, 1.30 in. across
C. 1-in. MNPT

D. ¾-in. MNPT

6 Emerson.com/Rosemount