The Model 6081-P transmitter is ideal for monitoring applications, especially in hard-to-reach or costprohibitive locations. Model 6081-P measures pH and ORP and is compatible with most Rosemount Analytical pH and ORP sensors. The transmitter has a rugged, cast aluminum weatherproof and corrosionresistant enclosure (NEMA 4X). The transmitter includes a two-line 16-character display with simple and intuitive menu screens. Plain language prompts in six (6) local languages guide the user through the programming and calibration procedures. Model 6081 is compatible with non-preamp pH and ORP sensors and SMART pH sensors from Rosemount Analytical.

Installation and start-up of the Model 6081-P wireless transmitter is simple. Just power the Model 6081-P and assign it to a wireless network with a Model 1420 Gateway. The unit will auto-locate the most efficient path to the host and will begin transmitting measurement data immediately via 2.4 GHz wireless communications. The Self-Organizing Network ensures exceptional data reliability and network stability. All of Emerson Process Management’s wireless devices employ Encryption, Authentication, Verification, Anti-Jamming and Key Management to ensure data transmission and security. Rosemount Analytical devices include intelligent power management to reduce power consumption and extend power module life while delivering highly reliable measurements with rich HART data and diagnostic information. HART® digital communication allows access to AMS™ (Asset Management Solutions) for live process variables, useful diagnostics and troubleshooting information.

SPECIFICATIONS - GENERAL
Enclosure: Cast aluminum. NEMA 4X.
Dimensions: 6.55” x 5.40” x 5.15” (166mm x 137mm x 131mm).
Conduit Openings: 3/4” FNPT
Ambient Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: -4 to 158°F (-20 to 70°C)
Relative Humidity: 0 to 95% (non-condensing)
Weight/Shipping Weight: 7 lbs/8 lbs (3.2/3.6 kg)
RFI/EMI: EN-61326
Digital Communications: HART 7 WirelessHART

SPECIFICATIONS - WIRELESS
Output: WirelessHART V7
Transmit Rate: User selectable, 1/sec. to 1/60 min (via 1420 Wireless Gateway or AMS)
Measurement update rate: 1/sec. to 1/10 min
Antenna: PBT/PC integrated omni-directional antenna Radio Frequency: 2.4 GHz DSSS
Transmission distance - line of sight: about 600 ft (ideal RF conditions and power module condition)
Power: Lithium thionyl chloride long life power module

FUNCTIONAL SPECIFICATIONS
pH Range: 0 to 14
ORP Range: -1400 to +1400mV
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 fluctuations. 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
  EEPROM Warning
  Sense Line Open Warning
  Factory Cal Warning
  Keyboard Warning
Once a fault or warning is detected, the display will show a message describing the problem.
Temperature Range: -10 to 150°C (PT100 and PT1000)
Display: 2-line, 16 character display supports display of pH and mV units. Display shows temperature.
Approvals:
RFI/EMI: EN-61326