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MODEL 2081 pH SECTION 9.0
DESCRIPTION AND SPECIFICATIONS
9.3 PERFORMANCE SPECIFICATIONS
(Transmitter only)
Range: 0 to 14 pH
Output Scale: Zero Suppression: Up to 13 pH units
Span: From 1 to 14 pH units
Accuracy: ± 0.02 pH, 0.1°C
Resolution: 0.01 pH, 0.1°C
Repeatability: ± 0.01 pH
Stability: 1%/ year at 25°C
Temperature Effect: 0.02% F.S./°C
Vibration Effect: ± 1.0% of F.S. per SAMA PMC
31.1, Section 5.3, Condition 2.
EMI/RFI:
EN50081-1
EN50082-2
9.4 PHYSICAL SPECIFICATIONS
Electrical Connections: 1/2 in. NPT.
Model 275 SMART FAMILY Interface
connections permanently fixed to terminal block.
The terminal block also has removable
connectors for bare wire sensor connections.
Housing: Epoxy-polyester painted over low-copper
aluminum. BUNA-N O-rings on cover.
Recommended Cable: Transmitter to power supply
two-wire, 18 AWG, shielded, Belden 8760 or
equal (Rosemount Analytical PN 9200001).
Weight/Shipping Weight: 2.18 kg/2.68 kg (4.8 lb/5.9 lb)
9.2 FUNCTIONAL SPECIFICATIONS
Inputs: mV (for pH); resistance (for temperature)
Output: Two-wire 4-20 mA with superimposed HART
digital signal.
Power Supply and Load Requirements: See graph
below. A minimum loop resistance (load) of 250
ohms and minimum power supply voltage of 18
volts DC is required for digital communication.
Local Indication: Four digit LCD
Ambient Temperature: –30 to 70°C (–22 to 158°F)
Failure Mode Alarm: The analog signal will be driven
either below 4 mA or above 20 mA (user-
selectable) to alert the user.
Transmitter Security: Security activation (by internal
jumper) prevents changes to the transmitter
configuration from the local interface.
Relative Humidity : 0-95%
Automatic Temperature Compensation: Pt100 RTD
–15 to 115°C (5 to 239°F)
Enclosure: NEMA 4X (IP65) , weatherproof and
corrosion-resistant NEMA 7B, explosion proof
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=80°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)
LOAD/POWER SUPPLY REQUIRE-
MENTS
12 VDC 18 VDC 42.4 VDC @ ZERO LOAD
LIFT OFF 42.4 VDC MAXIMUM
POWER SUPPLY VOLTAGE
1848–
1800–
1500–
1000–
500 –
250 –
0
–
Load (ohms)
WITHOUT HART COMMUNICATION
OPERATING
REGION
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