Specifications

3
MODEL Xmt-P SPECIFICATIONS
Intrinsic Safety:
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
ATEX
PROCEDURE — QUICK STANDARDIZATION CALIBRATION
The pH measured by the transmitter can be changed to match the reading from a second or referee instrument. The
process of making the two readings agree is called standardization.
During standardization, the difference between the two values is converted to the equivalent voltage. The voltage, called
the reference offset, is added to all subsequent measured cell voltages before they are converted to pH. If after stan-
dardization the sensor is placed in a buffer solution, the measured pH will differ from the buffer pH by an amount equiva-
lent to the standardization offset.
1. Install the pH sensor in the process liquid.
2. Once readings are stable, measure the pH of the liquid using a referee instrument.
3. Because the pH of the process liquid may change if the temperature changes, measure the pH of the grab sample
immediately after taking it.
4. For poorly buffered samples, it is best to determine the pH of a continuously flowing sample from a point as close as
possible to the sensor.
5. From the main display, press ENTER 3 times within 5 seconds.
6. The top line shows the present reading. Use the arrow keys to change the
pH reading in the second line to match the pH reading from the referee
instrument.
7. The screen at left appears if the entered pH was greater than 14.00 or if
the mV offset calculated by the transmitter during standardization exceeds
the reference offset limit programmed into the transmitter. The display then
returns to the main display. Repeat the standardization. To change the refer-
ence offset from the default value (60 mV), see section 7.4.
8. If the entry was accepted the display returns to the main display.
*Quick Standardization allows the Xmt-P-FF Fieldbus Transmitter to be standardized without the need to set the
Transducer Block to the Out of Service Mode. The measured pH status remains good and prevents any subsequent
function blocks linked to the Transducer Block from going to the Out of Service Mode, or exhibiting spurious block errors.