Emerson XMT-P-FF/FI instruction sheet Specifications - General, Functional Specifications

MODEL Xmt-P

SPECIFICATIONS - GENERAL

Case: ABS. panel mount, polycarbonate (pipe/surface mount). Both versions are NEMA 4X/CSA 4 (IP65).

Dimensions

Panel (code -10):6.10 x 6.10 x 3.72 in. (155 x 155 x 94.5 mm)

Surface/Pipe (code -11):6.23 x 6.23 x 3.23 in. (158 x 158 x 82 mm); see page 5 for dimensions of pipe mounting bracket.

Conduit openings: Accepts PG13.5 or 1/2 in. conduit fit- tings

Ambient Temperature: 32 to 122°F (0 to 50°C). Some degradation of display above 50°C.

Storage Temperature: -4 to 158°F (-20 to 70°C)

Relative Humidity: 10 to 90% (non-condensing)

Weight/Shipping Weight: 2 lb/3 lb (1 kg/1.5 kg)

Display: Two line, 16-character display. Character height:

4.8mm; first line shows process variable (pH, ORP, conductivity, % concentration, oxygen, ozone, chlo- rine, or monochloramine), second line shows process temperature and output current. For pH/chlorine com- bination, pH may also be displayed. Fault and warn- ing messages, when triggered, alternate with temper- ature and output readings.

During calibration and programming, messages, prompts, and editable values appear on the two-line display.

Temperature resolution: 0.1°C (≤99.9°C); 1°C (≥100°C)

Hazardous Location Approval: For details, see specifi- cations for the measurement of interest.

RFI/EMI: EN-61326

Digital Communications: For details, see specifications for the measurement of interest.

Power & Load Requirements: A power supply voltage of 9-32 Vdc at 13 mA is required.

FUNCTIONAL SPECIFICATIONS

pH Range: 0 to 14

ORP Range: -1400 to +1400mV

Calibrations/standardization: The automatic buffer recognition uses stored buffer values and their tempera- ture curves for the most common buffer standards avail- able worldwide. The transmitter also performs a stabilization check on the sensor in each buffer.

SPECIFICATIONS

A manual two-point calibration is made by immersing the sensor in two different buffer solutions and entering the pH values. The microprocessor automatically 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 accom- plished 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 integral pream- plifier 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 or 4 wire Pt 100 RTD or Pt 1000 RTD located in the sensor, compensates the pH reading for temperature fluctuations. Compensation covers the range -15 to 130°C (5 to 270°F). Manual temperature compensation is also selectable.

Accuracy: ±1 mV @ 25°C ±0.01 pH

Repeatability: ±1 mV @ 25°C ±0.01 pH

Stability: 0.25% / year @ 25°C

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:

Fieldbus (pH): Four AI blocks assigned to pH, tem- perature, reference impedance, and glass imped- ance.

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 4085. Device revision 1. Certified to ITK 4.5.

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