Specifications

MI 611-211 – October 2005 3. Operation

NOTE

Corrective action for AGING error is to check the value of the slope in the Status

menu. The glass or ISE electrode may be reaching the end of its useful life if the

SLOPE differs greatly from the theoretical value (80% is usual limit but application

requirements should dictate lowest acceptable slope).

Status

(Refer to “Structure Diagram 8” on page 45.)

The Status mode enables you to view the measurement and system parameters and thus assess the

performance of the loop. You may not edit them in this mode. For a string display of more than

eight characters, use the Left and Right arrow keys to scroll the display. All measurements

(outputs) continue while in the Status mode. To enter the Status mode, press the STATUS key.

Move through the menu by using the Up and Down arrow keys. While you are in the Status

mode, two segments of the bar graph will appear under the legend STATUS at the top of your

front panel. The Status menu contains the following parameters.

Configuration Errors

CAL REQ Calibration required Calibrate

4 - 20 RNG Measurement outside configured range Reconfigure range or correct

process error

MEAS RNG Measurement outside configured precision or scale Reconfigure precision or

correct process error

COMP RNG Measurement outside compensation curve Reconfigure compensation

or correct process error

Table 5. Status Parameters

Parameter Description

TEMP Process Temperature

SLOPE Efficiency of sensor expressed as the deviation in percent of the slope of the most

recent calibration compared to the standard (e.g., mV/pH/59.16 mV/pH)

ABSOLUTE Uncompensated millivolt signal from sensor

(a)

mA Analog Output: Analog output value in mA

Digital Output: Output shown on secondary display in mA.

GLASSRES Indicates whether resistance of glass electrode is acceptable

ASYMM Asymmetry potential (mV difference from the expected theoretical isopotential pH

voltage of zero)

REF RES Resistance of reference electrode

ATC RES Resistance of temperature compensator

CAL NAME Name of last calibrator

LAST CAL Date of last calibration (mm/dd/yy)

Table 4. Diagnostic Error Messages (Continued)

Message Description Corrective Action