General Purpose pH/ORP Sensors Product Data Sheet

LIQ-PDS-3900 / Rev. F May 2015

General Purpose pH/ORP Sensors

 SMART preamplifier-stores calibration and other data.
 Extended sensor life provided by double junction reference.
 Enhanced performance and increased life with minimized glass cracking provided by field-proven
AccuGlass™ pH glass formulations.
 VP8 quick cable-to-sensor release, provided by the watertight VP8 multiple-pin connector, elimi-
nates cable twisting.
 Maximum chemical resistance provided by rugged polyphenylene sulfide body,
completely sealed to eliminate sensor leakage.
 NEW 3/4’’ and 1’’ mounting solutions to meet a variety of application
installation requirements.
 Optimum versatility with various mounting options
provided by one-piece construction with process
threads in two places.
 Operates in sub-zero temperatures
down to -10°C (14°F).
 Responds to changes in pH at a minimum 3900
conductivity of 0.1mS/cm when used with Insertion/Submersion Sensor
the low flow cell panel.

Features and Applications

General purpose pH/ORP 3900/3900VP sensor. The double This trending data allows technicians to predict frequency of
junction reference aids in the sensor’s resistance to harsh envi- maintenance and estimate sensor life for a particular process
ronments and helps prolong sensor life. The 3900 and 3900VP condition. Additional SMART features include factory calibration,
are provided with a double junction reference, which protects resetting SMART sensor calibration data, user menus, and man-
the reference element from poisoning ions – such as ammonia, ufacturing information.
chlorine, cyanides, and sulfides – in the process. Both models The AccuGlass™ pH glass formulations exceed industry stan-
are made with porous Teflon® junction positioned near the pH/ dards. The AccuGlass pH glass is a result of many years of glass
ORP-sensitive membrane. research resulting in a formulation which has been found to
The SMART preamplifier option becomes enabled when used increase the life of the sensor. Unlike other pH glasses presently
with the 56, 1056, 1057 analyzers and on the 6081P wireless on the market, this glass resists cracking especially at higher
transmitter. The pH-loop capabilities include auto-recognition temperatures and reduces sodium ion error commonly found
of the SMART sensor, automatic upload of calibration data in high pH applications. Overall, the AccuGlass formulation
and associated time stamp, historical recording of pH diag- enhances the sensor performance to measure pH more accurately
nostics (slope, offset, reference impedance, glass impedance). and have a longer sensor life than ever before.
General Purpose pH/ORP Sensors May 2015

Features and Applications (cont.) Physical Performance and

Specifications
The 3900VP is offered with a watertight sensor-to-cable con-
nector which eliminates re-wiring and cable twisting when
replacing sensors. The Variopol VP multiple pin connector is
Sensor Type: General purpose 3900
an integral part of each sensor model and uses a mating VP
Measured Range: pH: AccuGlass 0-14
cable. Once the cable is installed and wired to the analyzer,
ORP: -1500 to +1500 mV
sensors are easily replaced without replacing the cable and
Percent Linearity Over pH Range:
without rewiring the analyzer. Also the cable can be discon-
nected from the sensor before removal from the process Range Linearity
which eliminates cable twisting.
0-7 97%
The 3900 and 3900VP are housed in a molded PPS body, mak- 1-7 98%
ing each sensor virtually indestructible and chemically resistant.
4-7 98%
Complete encapsulation eliminates leakage or high humidity
problems traditionally found in other pH/ORP designs. The sim- 7 - 10 99%
plified construction, designed with user convenience in mind 7 - 12 97%
does not require electrolyte (KCl) replenishment or any high 7 - 13 96%
maintenance troubleshooting procedures.
7 - 14 95%
Installation is easily achieved through the wide variety of
mounting configurations. Both models feature 1’’ and ¾’’
Operating Temperature: -10° to 100°C (14° to 212°F) Automatic
inch (MNPT) front facing connections for insertion, submer-
temperature compensation -10° to 100°C (14° to 212°F)
sion, or flow-through pH and ORP applications.
Maximum Pressure: 790 kPa [abs] (100 psig) at 100°C (212°F)
Both models are combination sensors (pH, reference, and
CRN rating: 60 psig up to 100°C (212°F).
temperature within sensor body) and measure pH or ORP
Materials of Construction: stainless steel, glass, Teflon®, poly-
(Oxidation/Reduction Potential) of aqueous solutions in
phenylene sulfide (PPS), EPDM and silicone
pipelines, open tanks, or ponds. The 3900 and 3900VP are
suitable for virtually all applications and are compatible with Conductivity: Responds to changes in pH at a minimum conduc-
Rosemount Analytical and other manufacturers’ instruments. tivity of 0.1mS/cm when used with the low flow cell panel.
The sample flow rate must be controlled to 2gph (7.6L/hr).
Materials of ORP: Platinum
Process Connections:
Front facing: 3/4˝ and 1˝ MNPT
Rear facing: 1˝ MNPT
Integral Cable: 32 ft (10m) cable with integral preamp;
15 ft (4.7m) cable without preamp sensor
VP8 Cable: use 24281-XX, 2.5 ft (.8m) to 100 ft (31m)
Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)
Hazardous Location Approvals:

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May 2015 General Purpose pH/ORP Sensors

Dimensional drawing for the 3900 and 3900VP

3900 3900VP

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General Purpose pH/ORP Sensors May 2015

Installations and Accessories Specifications

Typical Flow Through insertion installation using PN 2002011 Pipe Tee
(sensor must be installed at least 10° above the horizon) Horizontal Pipe Tee (PN 2002011)
Pressure/Temperature Ratings
psig (kPa [abs]) °F (°C)
150 (1136) 150 (65)
128 (984) 160 (71)
102 (805) 170 (77)
80 (653) 180 (82)
57 (494) 200 (93)
48 (432) 210 (99)

Low Flow Cell PN 24091-00 MILLIMETER

INCH

Inlet and outlet connections are stainless steel and

take 1/4-inch OD tubing. Flow cell is polycarbonate
with 1/4-inch FNPT fittings.

WETTED MATERIALS:
BODY & NUT - POLYESTER/
POLYCARBONATE
FITTINGS - 316 SST
SEALS - SILICONE

FLOW CELL RATINGS

TEMPERATURE: 32˚-158˚F (0-70˚C)
MAX. PRESSURE: 90 PSIG (721 kPa [abs])
FLOW RATE: 2-5 GPH (7.6-18.9 LPH)

Flow-through tee (2 inch) (PN 915240-03, -04, -05)

MILLIMETER
INCH

Adapter
The following Flow-through Tee’s are available
for the 3900:
915240-03
915240-04
915240-05.
For a new installation use the appropriate tee
(915240-xx) and add the S10283-LQD adapter.
When replacing an existing 399 with a 3900
sensor, add the S10283-LQD adapter to convert
the tee to accept the 3900 sensor.

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May 2015 General Purpose pH/ORP Sensors

Jet Spray Cleaner PN 12707-00

The Jet Spray Cleaner eliminates routine, manual
sensor maintenance by cleaning the sensor with
water or compressed air. Flow through the cleaner
can be controlled by a solenoid valve.

Jet Spray Cleaner shown with

3900VP pH sensor

NOTE: The Jet Spray Cleaner can be used with

Handrail Mounting Assembly (PN 11275-01, not
shown) or can be mounted through conduit as
shown above.

Low Flow Panel PN SQP10077-LQD

Low Flow Panel Specifications

Inlet flow 3-80 gph (11.4-304 L/hr)
Inlet pressure 3 – 65 psig (122 – 549 kPa abs)*
Temperature 32 - 122°F (0 - 50°C)
*The minimum inlet pressure is required to open a check valve, which pre-
vents the flow cell from draining if sample flow is lost. Removing the check
valve lowers the inlet pressure requirement to a few feet of water head.

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General Purpose pH/ORP Sensors May 2015

3900/3900VP pH/ORP Sensor

The 3900/3900VP pH/ORP Sensor is housed in a PSS plastic body with built-in solution ground for advanced diagnostics. A Pt-100 RTD
is offered for temperature compensator. The sensor is available with an integral cable or VP8 connector. Integral preamplifier (-01) is the
standard SMART preamplifier option, and is compatible with the XMT, 56, 5081, 6081, 54e and 1056 analyzers/transmitters. Junction
box kits with preamplifiers can be ordered separately if an analyzer/ transmitter with an integral preamplifier is not located within
15 ft. of the sensor.

3900 pH/ORP Sensor - New Generation general purpose sensor

CODE Preamplifier Option
01 SMART Preamplifier, 32’ cable
02 No preamplifier, 15’ cable

Code Measuring Electrode

10 General Purpose Low resistivity GPLR pH Glass (0 - 14pH)
12 Platinum ORP
Example 3900 - 01- 12

3900VP pH/ORP Sensor - New Generation general purpose sensor with VP

CODE Preamplifier option
01 *SMART Preamplifier
02 No preamplifier

CODE Measuring Electrode

10 General Purpose Low resistivity (GPLR) pH Glass (0 - 14pH)
12 Platinum ORP
Example 3900VP - 02- 10
* A mating VP connector cable is required for all first time installations of 3900VP sensors. See accessories listing on next page.

3900VP
Insertion/Submersion Sensor with
VP connector and mating VP cable

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Accessories
Other Accessories
Part Number VP Connector Cables-Use for 1st time Installation of a 3900 VP Sensor
24281-00 15 ft. cable with mating VP8 connector
24281-01 25 ft. cable with mating VP8 connector
24281-02 2.5 ft. cable with mating VP8 connector
24281-03 50 ft. cable with mating VP8 connector
24281-04 100 ft. cable with mating VP8 connector
24281-05 4 ft. cable with mating VP8 connector
24281-06 10 ft. cable with mating VP8 connector
24281-07 20 ft. cable with mating VP8 connector
24281-08 30 ft. cable with mating VP8 connector
Mounting Accessories
12707-00 Jet Spray Cleaner
23242-02 Insertion adapter
24091-00 Low flow cell
23555-00 Junction Box with Preamplifier for the 54e, 3081, 4081, 5081, XMT, 1055, 1056
2002011 CPVC flow through Tee, 1-1/2 in. NPT process connection
11275-01 Sensor handrail assembly
9200273 Extension cable, gray
9200348 Extension cable, blue
915240-03 PVC flow through Tee, 3/4 in. NPT process connection
915240-04 PVC flow through Tee, 1 in. NPT process connection
915240-05 PVC flow through Tee, 1-1/2 in. NPT process connection
Calibration Accessories
9210012 Buffer solution, 4.01 pH, 16oz
9210013 Buffer solution, 6.86 pH, 16oz
9210014 Buffer solution, 9.18 pH, 16oz
R508-8oz. ORP solution, 460mV ±10 @ 20°C
SQP10077-LQD Low Flow Control Panel

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 LIQ_PDS_3900
Rev. F
May 2015

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