Emerson 5081-P-FF/FI Manuel D’Utilisation

Housing: Cast aluminum with epoxy coating. NEMA 4X (IP65)

and NEMA 7B. Neoprene O-ring cover seals. 

Dimensions: 6.3 in. x 6.9 in. x 6.4 in. (160 mm x 175 mm x 161

mm); diameter 6.1 in (155 mm)

Conduit Openings: 3/4 in. FNPT

Reference Impedance: Transmitter accepts high impedance

(i.e. glass) reference electrodes as well as low impedance
(i.e. silver-silver chloride) reference electrodes. 

Response Time: Display reaches 95% of final reading within 10

seconds.

Temperature Sensors: The following RTDs can be used with

the Model 5081-P pH/ORP transmitter:

3 and 4 wire Pt 100 RTDs

3 and 4 wire Pt 1000 RTDs

Transmitter can also be used with two-wire RTDs.

Temperature Range: 5°F to 248°F (-15°C to 130°C)

Local Display: Two line LCD; first line shows process variable

(pH or ORP), second line shows temperature and output sig-
nal. When triggered, fault and warning messages alternate
with temperature and output readings.

Process variable: 7 segment LCD, 0.8 in. (20 mm) high

Temperature/output: 7 segment LCD, 0.3 in. (7 mm) high

Display board can be rotated 90 degrees clockwise or coun-
terclockwise.

During calibration and programming, messages and prompts
appear in the temperature/output area.

A power supply volt-

age of 9-32 Vdc at 22 mA is required.

Security: User selected security code prevents accidental

changes to program settings.

Ambient Temperature: -4 to 149°F (-20 to 65°C)

Relative Humidity: 0 to 95% (with covers sealed)

Storage Temperature: -22 to 176°F (-30 to 80°C)

EMI/RFI: Meets the requirements of

EN-61326

Class I, II, III,  Div. 1 
Groups A-G
T4

Tamb = 70°C

Exia Entity
Class I, Groups A-D
Class II, Groups E-G
Class III
T4

Tamb = 70°C

0600  II  1  G

Baseefa02ATEX1284
EEx  ia  IIC  T4
Tamb = -20°C to +65°C

Class I, Div. 2, Groups A-D
Dust Ignition Proof
Class II & III, Div. 1, Groups E-G
NEMA 4X Enclosure

Class I, Div. 2, Groups A-D
Suitable for Class II, Div. 2, Groups E-G
T4

Tamb = 70°C

Class I, Div. 1, Groups B-D
Class II, Div. 1, Groups E-G
Class III, Div. 1

Class I, Groups B-D
Class II, Groups E-G
Class III
Tamb = 65°C  max

pH Input Range: 0 to 14 pH

Temperature Input Range: 5°F to 248°F (-15°C to 130°C)

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

Diagnostics: The internal diagnostics can detect:        

Calibration Error

Low Temperature Error

High Temperature Error 

Sensor Failure

Line Failure

CPU Failure                      

ROM Failure

Input Warning

Glass Failure

Glass Warning

Reference Failure

Reference Warning    

Once one of the above is diagnosed, the LCD will display a 
message describing the failure/default detected. 

Temperature Compensation: Automatic or manual between 5°F

to 248°F (-15°C to 130°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 transmitter recog-
nizes NIST, DIN 19266 and 19267, JIS 8802, BSM, Merck,
and Ingold buffers.

ORP Input Range: -1400 to 1400 mV

Temperature Input Range: 5°F to 248°F (-15°C to 130°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

Sira MC070112/00