Instruction manual

1
MODEL 5081-C SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
• CHo iCE o F Co MMu NiCATio N PRo To Co L: HART
®
or Fo u Nd ATio N Fieldbus.
• LARGE, EASY-To -REAd two-line display shows the process measurement and temperature.
• SiMPLE MENu STRu CTu RE.
• Ro Bu ST NEMA 4X ENCLo Su RE.
• iNTRiNSiCALLY SAFE d ESiGN allows the transmitter to be used in hazardous environments
(with appropriate safety barriers).
• No N-Vo LATiLE MEMo RY retains program settings and calibration data during power failures.
• MEASu RES Co Nd u CTiViTY, RESiSTiViTY, o R Cu STo M Cu RVE VARiABLE.
• Au To MATiC TC RECo GNiTio N simplifies start up.
• Au To MATiC/MANu AL TEMPERATu RE Co MPENSATio N ensures accurate monitoring and control.
• Au To MATiC Co MPENSATio N Fo R SENSo R CABLE RESiSTANCE improves accuracy of high
conductivity/ low resistivity measurements.
• Bu iLT-iN TEMPERATu RE Co MPENSATio N ALGo RiTHMS include straight slope, ultra-pure
water, cation conductivity, and no compensation.
1.1 FEATURES AND APPLICATIONS
The Model 5081-C can be used to measure conductivity
in a variety of process liquids. The 5081 is compatible
with most Rosemount Analytical sensors. See the
Specifications section for details.
The transmitter has a rugged, weatherproof, corrosion-
resistant enclosure (NEMA 4X and iP65) of epoxy-painted
aluminum. The enclosure also meets explosion-proof
standards.
The transmitter has a two-line seven-segment display.
The main measurement appears in 0.8-inch (20 mm) high
numerals. The secondary measurement, temperature
(and pH if free chlorine is being measured), appears in
0.3-inch (7 mm) high digits.
Two digital communication protocols are available: HART
(model option -HT) and F
o u Nd ATio N Fieldbus (model
option -FF). d igital communications allows access to AMS
(Asset Management Solutions). u se AMS to set up and
configure the transmitter, read process variables, and
troubleshoot problems from a personal computer or host
anywhere in the plant.
A handheld infrared remote controller or the HART and
F
o u Nd ATio N Fieldbus Model 375 communicator can also
be used for programming and calibrating the transmitter.
The remote controller works from as far away as six feet.
Housed in a rugged NEMA 4X case, the 5081C measures
conductivity or resistivity in the harshest environments.
Transmitter can also be configured, using the "Custom
Curve" feature, to measure ppm, %, or a no unit variable
according to a programmable conductivity vs. variable
curve. The transmitter will automatically recognize the
type of RTd (Pt100 or Pt1000) being used.
Measurements are automatically corrected for the resist-
ance of the sensor cable to improve accuracy of high con-
ductivity readings. The 5081C provides several
temperature compensation algorithms to ensure optimal
performance: linear slope, ultra-pure water (neutral salt),
or cation conductivity. Alternatively, temperature compen-
sation feature can be turned off to provide display of raw
conductivity.