Rosemount 2081 pH, Инструкция по эксплуатации

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SECTION 9.0 DESCRIPTION AND SPECIFICATIONS
•
FIELD MOUNTED TRANSMITTER ideal for central data processing and control.
• MEMBER OF THE ROSEMOUNT SMART FAMILY
®
•
LOCAL, PUSH-BUTTON INTERFACE for convenient calibration and range adjustment.
• HAZARDOUS AREA INSTALLATION certified NEMA 7B explosion-proof.
• NEMA 4X (IP65) WEATHERPROOF, CORROSION-RESISTANT ENCLOSURE.
• CONTINUOUS DIAGNOSTICS drive the output to a jumper-selectable high or low value in
the event of a failure.
9.1 FEATURES.
The Model 2081 pH Smart Transmitter, with the
appropriate sensor, is designed to continuously
measure pH in industrial and municipal processes.
This two-wire transmitter is a member of the
Rosemount SMART FAMILY of instruments, which
are designed to communicate with the hand-held
Model 275 SMART FAMILY Interface and any other
hosts that support the HART communications proto-
col. The Model 2081 design permits remote configu-
ration, interrogation, testing, and diagnostics.
The Model 2081 pH features an easy-to-use, dual
push-button interface on the transmitter housing for
local calibration and range adjustment. The standard
LCD display menu indicates the pH value as well as
temperature, current output value, range values,
electrode slope, and fault messages. All functions
are microprocessor based, using no switches or
potentiometers.
The isolated 4-20 mA output is continuously
expandable over the measurement range, and may
be displayed in either milliamps or percent of full
scale. A hold output function is available for manual
control during routine sensor maintenance. While in
hold mode the current output signal will remain con-
stant at the last current value.
In the event of a failure, the transmitter diagnostic
routine will drive the output below 4 mA or above 20
mA in addition to displaying a fault code on the trans-
mitter.
With a two-point buffer calibration, the transmitter
automatically calculates the electrode slope and
memorizes the buffer values. On-line standardiza-
tion is easily accomplished by simply entering the
pH value of a grab sample into the transmitter. The
transmitter uses an RTD signal from the sensor to
automatically compensate the pH reading for process
temperature fluctuations.
The Model 2081 pH transmitter is designed to be
weatherproof and corrosion resistant to meet NEMA
4X (IP65) standards. An optional pipe or wall mount-
ing bracket is available. The transmitter is certified
NEMA 7B explosion-proof by Factory Mutual.
The Rosemount logo, HART and SMART Family are registered trademarks of
Rosemount Inc.
MODEL 2081 pH SECTION 9.0
DESCRIPTION AND SPECIFICATIONS