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MODEL 3081 pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
minimum voltage and load
for HART communication
1.3 SPECIFICATIONS -GENERAL
FOR MODEL 3081 pH/ORP
Case: Cast aluminum containing less than 8% magnesium.
NEMA 4X (IP65), NEMA 7 (explosion-proof)
Epoxy-polyester paint, Neoprene O-ring 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.
Output: Two-wire 4-20 mA output with superimposed HART
digital signal.
Output can be programmed to go to any value between
3.8 and 22.0 mA to indicate a fault or hold condition.
Response Time: Display reaches 95% of final reading within
10 seconds.
Temperature Sensors: The following RTDs can be used with
the Model 3081 pH/ORP transmitter:
3 and 4 wire Pt 100 RTDs
3 and 4 wire Pt 1000 RTDs
3000 ohm Balco RTD
Transmitter can also be used with two-wire RTDs.
Temperature Range: 5°F to 248°F (-15°C to 120°C)
Local Display: Two line LCD; first line shows process vari-
able (pH or ORP), second line shows temperature and
output signal. When triggered, fault and warning mes-
sages 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
counterclockwise.
During calibration and programming, messages and
prompts appear in the temperature/output area.
Power Supply and Load Requirements: See graph below.
A minimum loop resistance of 250 Ω and a minimum
power supply voltage of 18 Vdc is required for HART
communication. Maximum power supply voltage for
intrinsically safe and explosion-proof operation is 42.4
Vdc.
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
EN50081-1
EN50081-2
Hazardous Area Classification:
Explosion Proof:
FM: Class I, Div. 1, Groups B, C & D
Class II, Div. 1, Groups E, F, & G
Class III, Div. 1
CSA: Class I, Div. 1, Groups C& D
Class I, Div. 2, Groups A, B, C & D
Class II, Div. 2, Groups E, F & G
Class III, Div. 1
Intrinsic Safety:
FM: Class I, II & III, Div. 1
T4 T AMB= 40°C; T3AT AMB= 70°C
CSA: Class I, Div. 1
T 3C T AMB=40°C; T3 T AMB=80°C
CENELEC: EEx ia IIC
T5 Tamb=40°C; T4 Tamb=65°C
Non-Incendive:
FM: Class I, Div. 2, Groups A, B, C & D
CSA: Class I, Div. 2, Groups A, B, C & D T5
(Tamb=40°C)
Weight/Shipping Weight: 10 lb/10 lb (4.5 kg/4.5 kg).
Weights and shipping weights are rounded to the nearest
whole pound.