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MODEL 3081 pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.6 ORDERING INFORMATION
The Model 3081 pH/ORP Smart two-wire microprocessor transmitter is housed in a NEMA 4X case. Communication with
the transmitter is through a hand-held infrared remote controller, a Model 275 HART communicator, or any HART com-
patible device. Automatic temperature compensation is standard, and the transmitter can be programmed to convert meas-
ured pH to pH at 25°C (solution temperature compensation). Continuous sensor diagnostics are standard.
3081pH - 01 - 20 - 67 EXAMPLE
MODEL
3081pH/ORP HART SMART TWO-WIRE MICROPROCESSOR TRANSMITTER
Code REQUIRED SELECTION
01-20 LCD (Infrared Remote Control - included)
01-21 LCD (Infrared Remote Control - not included)
Code AGENCY APPROVALS
67 FM approved, intrinsically safe when used with approved sensor and safety barrier, explosion-proof
69 CSA approved, intrinsically safe when used with approved sensor and safety barrier, explosion-proof
73 CENELEC approved, intrinsically safe, safety barrier required
1.4 SPECIFICATIONS - pH
pH Input Range: 0 to 14 pH
Temperature Input Range: 5°F to 248°F (-15°C to 120°C)
Output Scale Expansion: Continuously expandable
between pH 0 and 14
Accuracy at 25°C: ±0.01 pH
Repeatability at 25°C: ±0.01 pH
Resolution: 0.01 pH and 0.1°C or °F
Stability at 25°C: 0.25% per year
Temperature Compensation: Automatic or manual
between 5°F to 248°F (-15°C to 120°C)
Solution Temperature Compensation: Transmitter will
convert pH measured at any temperature to the pH at
25°C. Temperature coefficient is programmable
between -0.044 pH/°C and 0.028 pH/°C
Calibration: Automatic two-point and manual two-point
buffer calibration. For automatic calibration, the trans-
mitter recognizes NIST, DIN 19266 and 19267,
JIS 8802, BSM, Merck, and Ingold buffers.
1.5 SPECIFICATIONS - ORP
ORP Input Range: -1400 to 1400 mV
Temperature Input Range: 5°F to 248°F (-15°C to 120°C)
Output Scale Expansion: Continuously expandable
between -1400 and 1400 mV
Accuracy at 25°C: ±1 mV
Repeatability at 25°C: ±1 mV
Resolution: 1 mV and 0.1°C or °F
Stability at 25°C: 0.25% per year