Emerson XMT-P-FF/FI Manuel D’Utilisation

Case: ABS. panel mount, polycarbonate (pipe/surface

mount). Both versions are NEMA 4X/CSA 4 (IP65). 

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:

4.8 mm; 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.

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.

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. 

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.