Georg Fischer 2839-2842 Operating Manual
Signet 2839 to 2842 Conductivity Sensors
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3-2850.090
3-2850.090 Rev F 06/03 English
SAFETY INSTRUCTIONS
WARNING
1. Specifi cations
Dimensions
1. Depressurize and vent system prior to installation or removal.
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
6. When using chemicals or solvents care should be taken and
appropriate eye, face, hand, body, and/or respiratory protection should be used.
2839: 0.01 cell 2841: 1.0 cell2840: 0.1 cell 2842: 10.0 cell
38.9 mm/
1.530 in.
38.9 mm/
1.53 in.
English
Table of Contents
1. Specifi cations
2. Cell constant
selection
3. In-line Installation
4. Submersible or Tank
installation
5. Wiring
6. Maintenance
7. Ordering information
38.9 mm/
1.53 in.
73.7 mm/
2.90 in.
15.9 mm/
0.625 in.
144 mm
5.66 in.
2850
5800CR
5900
102.7 mm/
4.05 in.
35.8 mm/
8850-X
1.41 in.
3-2840-1
3-2840-1D
8860
0.625 in.
15.9 mm/
8900
21.5 mm/
0.85 in.
9050CR
0.625 in.
15.9 mm/
3-2840-2
3-2840-2D
105.9 m
4.17 in.
35.8 mm/
1.41 in.
09 mm/
.29 in.
41.9 mm/
1.65 in.
0.625 in.
15.9 mm/
3-2841-1
3-2841-1D
3-2842-1
3-2842-1D
26.8 mm/
1.13 in.
15.9 mm/
3-2841-2
3-2841-2D
3-2842-2
3-2842-2D
41.9 mm/
1.65 in.
0.625 in.
112 mm
4.41 in.
PSIBAR
100
7
75
5
50
3
140.7 mm/
5.54 in.
73.7 mm/
2.90 in.
3-2839-1
3-2839-1D
General
Compatibility:
59.3 mm/
15.9 mm/
0.625 in.
CR Electrodes
with Cable (-1X)
CR Electrodes
with DryLoc™ (-2X)
2.33 in.
3-2839-2
3-2839-2D
Quality Standard:
• Manufactured under ISO 9001, ISO 14001
• CE
Shipping Weight:
2
25
°C
°F
-20-40
20
32 68
All -2X versions
60
100 140
212
140
284
2839: 0.34 kg (0.74 lb)
2840, 2841, 2842: 0.30 kg (0.66 lb)
Process connection:
-1 and -2 versions:
-1D and -2D versions: ISO 7/1-R3/
3
/4 in. NPT
4
Operating temperature/pressure:
(with thread engagement per ANSI B1.20.1)
-1X versions:
-10ºC to 100ºC @ 6.9 bar (14ºF to 212ºF @ 100 psi)
Cable (28XX-1X only):
4.6 m (15 ft.) std., 3 cond w/shld 22 AWG,
max length 30 m (100 ft.)
-10ºC to 131ºC @ 2.76 bar (14ºF to 268ºF @ 40 psi)
-2X versions:
-10ºC to 85ºC @ 6.9 bar (14ºF to 185ºF @ 100 psi)
(For resistivity measurements above 10 MΩ or
below 20°C, maximum cable length is 25 ft. (7.6 m)
Performance:
Accuracy: ±2% of cell value
Temperature measurement: PT1000
Temperature response time (τ):
2839: 5 s 2840: 10 s
2841: 20 s 2842: 30 s
Storage temperature: -20ºC to 131ºC (-4ºF to 268ºF)
Wetted materials:
DryLoc connector (-2 versions only): CPVC
Threaded fi tting: PEEK™
Insulator: PEEK™
Insulator O-ring (2841, 2842): FPM
Electrode contacts: 316L stainless steel
PEEK™ is a trademark of Victrex plc
2. Cell constant selection
The nominal process value should be near the center of
the range. Ranges below are for use with +GF+ SIGNET
Conductivity instruments:
• 2839 (0.01 cell): 0.010 to 100 µS (10 kΩ /to 100 MΩ)
• 2840 (0.1 cell): 1 to 1000 µS (1 MΩ to 1 kΩ)
• 2841 (1.0 cell): 10 to 10,000 µS
• 2842 (10.0 cell): 100 to 200,000 µS
+GF+ SIGNET Conductivity/Resistivity Electrode Ranges
2842 10.0 cell
2841 1.0 cell
2840 0.1 cell
2839 0.01 cell
Electrode Models
0.010µs 1µs 10µs 100µs 200µs 1000µs 10 000µs 200 000µs 400,000µs
(100 MΩ)
(10 kΩ)
Conductivity Range (µS)
3. In-line installation for all -1X electrodes
• Inspect threads to ensure integrity. Do not install an electrode with damaged threads.
• Apply sealant or PTFE tape to threads.
• Wetted materials include 316L stainless steel, PEEK™ and FPM (FPM O-ring inside 2841, 2842).
Check for chemical compatibility before installing electrode.
• The -1X electrodes are supplied with 5 m (15 ft.) of cable. It may be extended to a maximum 30 m (100 ft.)
• For resistivity measurements above 10 MΩ or below 20°C, maximum cable length is 25 ft. (7.6 m)
If the electrode is mounted
vertically in a tee, do not recess
the openings inside the tee.
Mounting upside down may help
prevent air entrapment.
An oversized tee may also be
helpful for inline installations.
The preferred installation for in-line
applications directs fl ow straight into the
At least 4 threads (ANSI B1.20.1)
must be engaged to provide
pressure capacity per published
electrode. This confi guration dislodges
entrapped air bubbles, and provides the best
continuous sampling of the fl uid content.
specifi cations.
4. Submersible installation for all -1X electrodes
• Wetted materials include 316L stainless steel, PEEK™ (FPM O-ring inside 2841, 2842).
• Check for chemical compatibility before installing electrode.
• The -1X electrodes are supplied with 15 ft. of cable. It may be extended to a maximum 30 m (100 ft.)
• For resistivity measurements above 10 MΩ or below 20°C, maximum cable length is 25 ft. (7.6 m)
1. Feed cable into watertight conduit.
2. Apply thread sealant to the electrode before threading
conduit onto electrode. Avoid twisting the cable.
3. Secure cable with conduit or cable gland.
4. For additional defense against possible accumulation of
condensation at the back seal area of the electrode, fi ll the
lower 3-4 inches (75-100 mm) of conduit or extension pipe
with a fl exible sealant such as silicone.
In aerated vessels install the electrode
in a stillwell to prevent air from being
trapped inside the electrode.
3/4 in. NPT or
ISO 7/1-R3/4
2 Product name
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