Rosemount Analytical 242 Specifications
Product Data Sheet
Model 242
LIQ-PDS-242
June 2017
Flow Through Toroidal C onductivity Sensor
•
FLOW THROUGH DESIGN is ideal for use with viscous,
abrasive, or fibrous process liquids.
• OVER 250 CONFIGURATIONS to meet customers' needs.
• REPLACEABLE LINER in glass-filled PEEK, TEFLON, or
ALUMINA reduces long-term operating costs.
•
DIN and ANSI FLANGES compatible with all piping installations.
•
LINE SIZES of 1 through 4 inches (DN 25, 40, 50, 80 and
100).
• IN-LINE CALIBRATION saves money by reducing labor
and down-time.
• TEMPERATURE SENSOR and JUNCTION-BOX included.
FE AT URE S AND APPL ICAT IONS
Rosemount Analytical Toroidal Conductivity Sensors
are ideal for use in processes where contacting sensors -- those with electr odes exposed to th e m easur ed
solution -- would corrode or become fouled.
The Model 242 Flow Through Toroidal conductivity
sensor consists of two toroids surrounding a pipe
through which the proc ess liqu id flo ws. O ne t or oi d acts
as a transmitter and the other as a receiver.
Energizing the transmitter toroid induces an electric
current in the proc ess solution which induces a n electric current in t he receiver toroid. The strengt h of the
induced current is direct ly proportional to the conductivity of the solution.
The Model 242 sensor is available in over two hundred fifty configurations to meet the needs of many
applications and installations. Line sizes of 1, 1.5, 2, 3,
and 4 inches (25, 40, 50, 80, and 1 00 mm) are available with both ANSI and DIN compatible flanges. A
variety of liner m aterials and O-rings are available to
ensure compatibility with most process liquids.
The Model 242 sensor is e asy to install. It fits in th e
process piping between mounting flanges. Special
grounding rings are not needed because the senso r
has contact rings built into it. Recessed bolts hold the
sensor together to ensure all internal parts stay in
perfect alignment. A junction box and a Pt 100 RTD
are included. The RTD slips easily into one of the
sensor contact rings. There is no need to install a
separate thermowell, and temperature measurements are made at th e sam e point as the con ductivity measurements.
The Model 242 is n ot sensitive to flow r ate or direction. It does not obstruc t the process flow. The sensor is rugged and constructed from chemically
resistant materials. All these features m ake the sensor ideal for applications in mining and metals processing, pulp and paper processing, and the
chemical processing industry.
The Model 242 Flo w Through C onductivit y Sensor is
compatible with instrument Models 54eC, 1055,
3081T, 4081T, 5081-T, and Xmt-T.
SPECIFICATIONS
Installation Type
Flow Through
Conductivity Range
Process Connections
Maximum Temperature
Maximum Pressure
Wetted Materials:
O-rings
Shipping Weight
The Model 242 Flow Through Sensor comprises a toroid
housing constructed from 316 stainless steel and polyethyleneterephthalate, process connection flanges of 316
stainless steel, two metal c ontact rings (available in choice
of three materials), an insulating liner (choice of three
materials), O-rings (choice of three materials), a Pt 100
RTD, and a sensor-mounted junction box. Only the liner,
contact rings, and O-rings are wetted b y the process. The
Pt 100 RTD is designed for insertion into one pre-drilled
contact ring. The NEMA 7D junction box is constructed of
heavy duty epoxy-painted cast aluminum . The conductivity
range is user-selectable with the tappe d toroid windings. Inline calibration can be perform ed with resistors connect- ed
to an integral wire around the toroids that is terminated in
the junction box.
Liners are available in T eflon, glass-filled Polyetheretherk etone (PEEK), and alumina. These mater ials provide
excellent chem ical resistance. P EEK is recom mended for high pressure or high tem perature appl ications. Tef lon
is recommended when the process solution contains hydrofluoric acid or other strong oxidizing agents. Alumina is
recommended if the process solution is abrasive, such as in alumina/caustic ratio applications.
Pt 100 RTD
Flange
Contact Ring
Liner
O-ring (not visible)
Teflon is a registered trademark of E.I. du Pont de Nemours & Co.
Viton is a registered trademark of Du Pont Dow Elastomers.
Carpenter 20Cb-3 is a registered trademark of Carpenter Technologies.
Hastelloy is a registered trademark of Haynes International.
Chemraz is a registered trademark of Greene, Tweed, & Co.
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Liner
Contact Rings
100 μS/cm to 2 S/cm
150# ANSI, 300# ANSI, PN16 DIN 2501 compatible flanges
Depends on configuration. For plastic-lined sensors, see charts on facing page.
For alumina-lined sensors, see charts on page 4.
Depends on configuration. For plastic-lined sensors, see charts on facing page.
For alumina-lined sensors, see charts on page 4.
Teflon® (PTFE), glass-filled PEEK, or alumina
316 SST, Carpenter 20Cb-3
EPDM, Viton
1” to 2”: 22 lbs. (10kg)
3” to 4”: 86 lbs. (39 kg)
®
(FKM), or Chemraz® (FFKM)
®
SST, or Hastelloy® C-276
Pressure - Temperature Specifications for 1”, 1.5”, and 2” (25, 40, and 50 mm) Sensors:
Models 242-02, 242-03, and 242-04
Pressure - Temperature Specifications for 3” and 4” (80 and 100 mm) Sensors:
Models 242-06 and 242-08
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