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Instruction Sheet 6081-P
LIQ_MAN_ABR_6081-P October 2013
Product Description
When used with appropriate sensors, the 6081-P can measure pH or ORP (oxidation reduction potential) of a liquid and
transmit data wirelessly with a radio transceiver which uses HART 7 communication protocol. The instrument has a
local operator interface consisting of a keyboard and LCD display which can be used to observe process parameters or to
congure the 6081. This instrument is available with approvals for use in hazardous areas.
General Specifications
Enclosure: Cast aluminum. NEMA 4X, IP66
Dimensions: 6.55” x 5.40” x 5.15” (166mm x 137mm x 131mm)
Conduit Openings: ¾” FNPT
Ambient Temperature: -4 to 149 °F (-20 to 65 °C)
Storage Temperature: -22 to 158 °F (-30 to 70 °C)
Relative Humidity: 0 to 95% (non-condensing)
Weight/Shipping Weight: 7 lbs/8 lbs (3.2/3.6 kg)
Digital Communications: HART 7 Wireless HART™
Functional Specifications
pH Range: 0 to 14
ORP Range: -1400 to +1400mV
Compatible with Rosemount Analytical SMART pH sensors
Calibrations/standardization: The automatic buffer recognition uses stored buffer values and their temperature curves
for the most common buffer standards available worldwide. The transmitter also performs a stabilization check on the
sensor in each buffer.
A manual two-point calibration is made by immersing the sensor in two different buffer solutions and entering the pH
values. The microprocessor automatically calculates the slope which is used for self-diagnostics. An error message will
be displayed if the pH sensor is faulty. This slope can be read on the display and/or manually adjusted if desired. An on-
line one-point process standardization is accomplished by entering the pH or ORP value of a grab sample.
The following calibration methods are supported:
- Two point calibration with Low and High buffer (pH only)
- Two point calibration with Automatic Buffer recognition (pH only)
- Single point standardization
- Single point Temperature Adjustment
- Automatic calibration upon live connection to RAI SMART pH sensors and upload of stored cal data to transmitter
Automatic Temperature Compensation: External 3-wire Pt100 RTD or Pt1000 RTD located in the sensor, compensates
the pH reading for temperature uctuations. Compensation covers the range -10 to 150 °C (14 to 302 °F). Manual
temperature compensation is also selectable.
Accuracy: ±1 mV @ 25 °C ±0.01 pH
Repeatability: ±1 mV @ 25 °C ±0.01 pH
Information and Status: Information screens display faults and warnings, radio transmission status, network ID number,
Power Module voltage, transmitter model, and software version.
Diagnostics: The internal diagnostics can detect:
RTD Failure
Glass Low Failure
Glass High Failure
Broken Glass Fault
Reference High Failure
CPU Error
High Temperature Warning
Low Temperature Warning
Glass Impedance High Warning
Glass Impedance Low Warning
Reference Impedance High Warning