4
Signet PVDF Conductivity Sensors
• 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, PVDF and FKM (FKM O-ring inside 2841, 2842). Check
for chemical compatibility before installing electrode.
• Electrodes are supplied with 4.6 m (15 ft) of cable. It may be extended to a maximum 30 m (100 ft).
• For resistivity measurements above 10 M
Ω
or below 20 °C, maximum cable length is 7.6 m (25 ft).
• When using the 2850 Conductivity/Resistivity Sensor Electronics, maximum cable length is 4.6 m (15 ft).
• When using 9900, maximum cable length is 30 m (100 ft).
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.
At least 4 threads (ANSI B1.20.1) must be engaged to provide pressure
capacity per published specifi cations.
The preferred installation
for in-line applications directs fl ow straight into the electrode.
This confi guration dislodges entrapped air bubbles, and provides the best continuous sampling of the fl uid content.
The nominal process value should be near the center of the range.
Ranges below are for use with Signet Conductivity Instruments:
• 2839 (0.01 cm
-1
): 0.010
to
100
μ
S (10 k
Ω
to 100 M
Ω
)
• 2840 (0.1 cm
-1
): 1
to
1000
μ
S (1 M
Ω
to 1 k
Ω
)
• 2841 (1.0 cm
-1
): 10
to
10,000
μ
S
• 2842 (10.0 cm
-1
): 100
to
200,000
μ
S
(100 M
)
(10 k
)
2839 0.01 cm
-1
2841 1.0 cm
-1
2842 10.0 cm
-1
2840 0.1 cm
-1
0.010
μ
s 1
μ
s 10
μ
s 100
μ
s
1000
μ
s 10,000
μ
s
200,000
μ
s
Conductivity Range (
μ
S)
Signet Conductivity/Resistivity Electrode Ranges
Electrode Models
The sensor was delivered from the factory with a calibration certifi cate.
The information provided on the certifi cate (custom cell constant and
temperature offset) should be entered in the transmitter/controller. See
individual product manual for details.
Cell Constant Selection
Custom Cell Certifi cate
Installation
In-Line Installation
