Signet 2839-2842 Conductivity Electrodes
Features
• Dual-threaded
• Compact electrode
length for easy in-line
installation in small
pipe sizes
• Triple orifice flowthrough design
reduces clogging and
bubble entrapment
• 316SS electrodes
with injection molded
PEEK™ process connections and insulators
2841-1
2842-1
Description
The Signet 2839-2842 Conductivity/
Resistivity Electrodes are available
in four cell constants from 0.01 to
-1
10.0 cm
, and are suitable for a wide
variety of applications ranging from
high purity water quality monitoring
to weak acids and bases. 316SS electrode surface finishes are controlled
in a precision bead blasting operation
to ensure measurement accuracy and
System Overview
In-Line Installation
Panel Mount Pipe, Tank, Wall Mount Integral Mount
Signet Conductivity
Instrument
(sold separately)
8850 8860
8900 5800CR
Signet
2839-2842
Conductivity
Electrodes
Signet 8850
Conductivity
Instrument
(sold separately)
Signet Universal
Adapter Kit (3-8050)
(sold separately)
Signet 2839-2842
Conductivity
Electrodes
Signet 8850
Conductivity
Instrument
(sold separately)
Signet Integral
Adapter Kit (3-8052)
(sold separately)
Signet 2839-2842
Conductivity
Electrodes
2839-12840-1
repeatability. The PEEK™ insulator
and process connections are injection
over-molded to minimize variance
between electrodes. Double threaded
connections in either 3/4 in. NPT or
ISO 7/1-R 3/4 enable quick and easy
installation in submersible or in-line
configurations. Transmitter integral
mounting kit and junction boxes are
available as accessories.
Multi-Parameter
Panel Mount
Signet 8900
Instrument
(sold separately)
Signet 2850
In-Line
Conductivity
Sensor
(sold separately)
Signet 2839-2842
Conductivity
Electrodes
4 to 20mA Input
Chart Recorder
(sold separately)
Signet 2850
In-Line
Conductivity
Sensor
(sold separately)
Signet 2839-2842
Conductivity
Electrodes
OR
Programable
Logic Controller
• Cell constants may
be traceable to NIST
and certified to within
±1% of value - meets
USP requirements
Applications
• Water Treatment &
Water Quality
Monitoring
• Reverse Osmosis
• Deionization
• Cooling tower and
Boiler Protection
• Distillation
• Desalination
• Demineralizer
• Semiconductor
• Aquatic Animal Life
Support Systems
Submersible Installation
Panel, Pipe, Tank, Wall Mount
Signet Conductivity Instrument
8850 8860 8900 5800CR
Pipe extension or
conduit with 3/4 in.
FNPT threads
(customer
supplied)
AND/OR
Signet 2850
Submersible
Conductivity
Sensor
Signet 2839-2842
Conductivity Electrodes
114
Fittings - Customer supplied, 3/4 in. NPT or ISO threaded
www.gfsignet.com
Specifications
General
Range:
• 2839:
0.055 to 100μS (18.2MΩ to 10KΩ)
(0.02 to 50 ppm)
• 2840:
1 to 1,000μS (1MΩ to 1KΩ)
(0.5 to 500 ppm)
• 2841:
10 to 10,000μS (5 to 5,000 ppm)
• 2842:
100 to 200,000μS (50 to 100,000 ppm)
Accuracy:
±2% of cell constant value (standard).
Cell constants can be traceable to
NIST and certified to within ±1% of
value (contact factory)
Dual-threaded process connection:
• -1 versions: 3/4 in. NPT
• -1D versions: ISO 7/1-R3/4
Wetted Materials
• Internal O-ring (2841 and 2842): FPM
• Insulator material: PEEK™
• Electrode material: 316SS
• Threaded process connection: PEEK™
Max. Pressure/Temperature Ratings
Operating temperature/pressure:
• -10°C to 100°C @ 6.9 bar
(14°F to 212°F @ 100 psi)
• -10°C to 131°C @ 2.76 bar
(14°F to 268°F @ 40 psi)
Storage temperature:
-20°C to 131°C (-4°F to 268°F)
See page Temperature and Pressure graphs
for more information.
Shipping Weight
• 2839: 0.34 kg (0.74 lb)
• 2840, 2841, 2842: 0.30 kg (0.66 lb)
Choosing
Products
Instrument
Multi-Pa-
rameter
Flow
pH/ORP
Conductivity/
Resistivity
Cable:
• 4.6 m/15 ft, 3-cond. w/shield (standard)
• 30m/100 ft (maximum)
Temperature element: PT-1000
Temp. response, τ:
• 5 sec. (0.01 cell)
• 10 sec. (0.10 cell)
• 20 sec. (1.0 cell)
• 30 sec. (10.0 cell)
Temp. accuracy: ±0.5°C (±0.9°F)
Operating Range Chart
Bottled
UPW @ 25°C
USP
Rinse
Water
3-2841
3-2840
Water
3-2842
Standards and Approvals
• CE
• Manufactured under ISO 9001:2000
for Quality and ISO 14001:2004 for
Environmental Management
Cooling Tower
Waste Waters
(1.0 Cell)
(0.10 Cell)
Deionization Regen. Chemicals
Alkali Cleaners, Acids/Bases
Brackish
Sea Water
(Salinity)
(10.0 Cell)
Pressure, Level
Temperature,
Products
Other
Installation
Wiring &
Reference
Technical
Temperature/
Pressure
Graphs
www.gfsignet.com
3-2839 (0.01 Cell)
0.055µS
18.2MΩ
PPM TDS
1µS
1MΩ
10µS
100KΩ
550
100µS
10KΩ
1,000µS
500
10,000µS
5,000
50,000µS
25,000
100,000µS
200,000µS
50,000 100,000
400,000µS
200,000
115
of Terms
Glossary
Reference
Part No.
Index
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