Emerson Solu Comp Xmt-P-FF/FI Instrukcja Użytkownika Pobierz pdf (Strona 6)

MODEL Xmt-P pH/ORP TRANSMITTER

FEATURES

The Model Xmt-P Transmitter with the appropriate sensor can be configured for either pH or ORP (oxidation

reduction potential) measurement of aqueous solutions. Housed in a NEMA 4X case, the Model Xmt can be locat-

ed close to the sensor even in the harshest environments, including process, water or wastewater monitoring.

Advanced features include automatic 2-point buffer calibration routine, automatic recognition of Pt 100 or Pt 1000

RTD, and menu-selected internal preamplifier. Predictive sensor diagnostic capability is possible through the

impedance measurement of the pH glass membrane and reference electrode, fully supported by AMS. Solution

temperature calibration allows the instrument to calculate and display the pH at 25°C when the temperature coef-

ficient of the measured liquid is provided.

FUNCTIONAL SPECIFICATIONS

pH Range: 0 to 14

ORP Range: -1400 to +1400mV

Calibrations/standardization: The automatic buffer

recognition uses stored buffer values and their tem-

perature curves for the most common buffer stan-

dards available worldwide. The transmitter also

performs a stabilization check on the sensor in

each buffer.

A manual two-point calibration is made by immers-

ing the sensor in two different buffer solutions and

entering the pH values. The microprocessor auto-

matically calculates the slope which is used for self-

diagnostics. An error message will be displayed if

the pH sensor is faulty. This slope can be read on

the display and/or manually adjusted if desired.

An on-line one-point process standardization is

accomplished by entering the pH or ORP value of a

grab sample.

Preamplifier Location: A preamplifier must be used to

convert the high impedance pH electrode signal to a

low impedance signal for transmitter use. The inte-

gral preamplifier of the Model Xmt-P may be used

when the sensor to transmitter distance is less than

15 ft (4.5 m). Locate the preamplifier in the sensor

or junction box for longer distances.

Automatic Temperature Compensation: External 3-

wire Pt100 RTD or Pt1000 RTD located in the sen-

sor, compensates the pH reading for temperature

fluctuations. Compensation covers the range -15 to

130°C (5 to 270°F). Manual temperature compen-

sation is also selectable.

Accuracy: ±1 mV @ 25°C ± 0.01 pH

Repeatability: ±1 mV @ 25°C ± 0.01 pH

Diagnostics: The internal diagnostics can detect:

Calibration Error Sensor Failure

High Temperature Warning CPU Failure

Low Temperature Warning Input Warning

ROM Failure Glass Warning

Glass Failure Reference Warning

Reference Failure

Once one of the above is diagnosed, the display

will show a message describing the problem.

DIGITAL COMMUNICATIONS:

HART (pH): PV assigned to pH. SV, TV, and 4V

assignable to pH, temperature, mV, glass

impedance, reference impedance, or RTD

resistance.

HART (ORP): PV assigned to ORP. SV, TV, and

4V assignable to ORP, temperature, reference

impedance, or RTD resistance.

Fieldbus (pH): Four AI blocks assigned to pH,

temperature, reference impedance, and glass

impedance.

Fieldbus (ORP): Three AI blocks assigned to

ORP, temperature, and reference impedance.

Fieldbus (pH and ORP): Execution time 75 msec.

One PID block; execution time 150 msec.

Device type 4088. Device revision 1. Certified to

ITK 4.6.

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

1180 II 1 G

Baseefa04ATEX0213X

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

T4 Tamb = 50°C

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