Emerson Solu Comp Xmt-P-FF/FI Instrukcja Użytkownika Pobierz pdf (Strona 9)

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MODEL Xmt-T TOROIDAL CONDUCTIVITY TRANSMITTER

FEATURES

The Model Xmt-T measures conductivity or % concentration in the harshest environments. Transmitter can also be configured,

using the "Custom Curve" feature, to measure ppm, %, or a no unit variable according to a programmable conductivity vs.

variable curve. The transmitter recognizes the type of RTD (Pt100 or Pt1000) being used. Measurements are automatically

corrected for the resistance of the sensor cable to improve accuracy of high conductivity readings. The Xmt-T is prepro-

grammed with several concentration curves: 0-12% NaOH, 0-15% HCl, 0-20% NaCl, and 0-25% and 96-99.7% H

. Tem-

perature compensation choices are linear slope correction or none (to provide display of raw conductivity).

FUNCTIONAL SPECIFICATIONS

Automatic Temperature Compensation:

3-wire Pt 100 RTD or Pt 1000 RTD

Conductivity: 0 to 200°C (32 to 392°F)

% Concentration: 0 to 100°C (32 to 212°F)

Diagnostics: The internal diagnostics can detect:

Calibration Error ROM Failure

Temperature Slope Error Zero Error

High Temperature Warning CPU Failure

Low Temperature Warning Input Warning

Once one of the above is diagnosed, the LCD will display a

message describing the problem.

Digital Communications:

HART: PV, SV, and TV assignable to measurement (con-

ductivity, resistivity, or concentration), temperature, and

raw conductivity. Raw conductivity is measured con-

ductivity before temperature correction.

Fieldbus: Three AI blocks assignable to measurement

(conductivity, resistivity, or concentration), temperature,

and raw conductivity. Raw conductivity is measured

conductivity before temperature correction. Execution

time 75 msec. One PID block; execution time 150

msec. Device type: 4087. Device revision: 1. Certified

to ITK 4.6.

TRANSMITTER SPECIFICATIONS @ 25°C

Measured Range: 50 to 2,000,000 µS/cm (see chart)

Repeatability: ± 0.25% of reading

Temperature Accuracy:

± 0.2°C between 0 and 50°C

± 0.5°C above 50°C

(excludes inaccuracies in sensor)

Temperature Slope Adjustment: 0-5%/° C

% Concentration Ranges:

Sodium Hydroxide: 0 to 12%

Hydrochloric Acid: 0 to 15%

Sulfuric Acid: 0 to 25% and 96.0 to 99.7%

Sodium Chloride: 0 to 20%

Ambient Temperature Coefficient:

± 0.1% of reading ±2µS/cm per °C

Maximum Cable Length: 100 ft (30 m)

LOOP SPECIFICATIONS

Loop Accuracy: With a standard Model 228 or 225 sensor

with 20' cable, following a single point calibration, laborato-

ry accuracy at 25°C can be as good as ±2% of reading

and ±50 µS/cm.

For optimum performance, standardize the sensor in the

process at the conductivity and temperature of interest.

Results under real process conditions, at different tem-

peratures, or using other sensors may differ from above.

Calibration: Calibrate against previously calibrated standard

sensor and analyzer, or calibrate against solution of known

conductivity.

RECOMMENDED SENSORS:

Model 222 Flow-Through

Model 225 Clean-In-Place (CIP)

Model 226 Submersion/Insertion

Model 228 Submersion/Insertion/Retractable

Model 242 Flow-Through

Model 245 Sanitary Flow-Through

Model 247 Submersion/Flow-Tee

HAZARDOUS LOCATION APPROVALS

Intrinsic Safety (with appropriate safety barrier):

Class I, II, III, Div. 1

Groups A-G

T4 Tamb = 50°C

Class I, II, III, Div. 1

Groups A-G

T4 Tamb = 50°C

ATEX 1180

II 1 G

Baseefa04ATEX0215X

EEx ia IIC T4

Tamb = 0°C to 50°C

Non-Incendive:

Class I, Div. 2, Groups A-D

Dust Ignition Proof

Class II & III, Div. 1, Groups E-G

NEMA 4/4X Enclosure

Class I, Div. 2, Groups A-D

Dust Ignition Proof

Class II & III, Div. 1, Groups E-G

NEMA 4/4X Enclosure

Values shown are for 25°C conductivity with a temperature slope of 2% per degree C. The maximum range value

will be lower for solutions with a higher temperature slope. Minimum conductivity depends on sensor.

RECOMMENDED RANGES FOR TOROIDAL SENSORS

Conductivity Sensor Model 226 228 225 222 (1in.) 222 (2 in.) 242 245 247

Nominal Cell Constant 1.0 3.0 3.0 6.0 4.0 * * 3.5

Minimum Conductivity (μS/cm) 50 200 200 500 500 100* 100* 500

Maximum Conductivity (μS/cm) 1,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000* 2,000,000 2,000,000

* Model 242 values depend on sensor configuration and wiring.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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