Emerson 54e pH/ORP Diagnostics, Autocal Standard, Stabilize pH 0.01 pH Stabilize time 10 sec

MODEL 54e pH/ORP	SECTION 5.0
	SOFTWARE CONFIGURATION

5.8 ON-LINE DIAGNOSTICS SETUP (continued)

"Cal warn" compares the on-line glass impedance with the value meas- ured at the last buffer calibration. This setting should be set to 0 (dis- abled).

"Imped comp" is used to compensate the glass impedance for tempera- ture changes. This is especially important at temperature extremes.

NOTE

The actual on-line values of the sensor diagnostics are available on the controller under the "Diagnostic Variables" header in the main menu (regardless of whether the messages have been turned on in this section).

5.9 AUTO CALIBRATION SETUP

		This section describes how the controller may be set up for auto calibra-
Diagnostics		tion, which includes automatic buffer recognition and auto stabilization.
		Alternatively, the controller may be configured to perform a manual cali-
Auto Calibration
		bration without the automatic features.
Security		1. Beginning from the main menu, move the cursor down to "Program"
		and press Enter (F4). From the program menu, move the cursor
Exit	Enter	down using the arrow key to highlight "Configure" and press Enter
		(F4).
		Use the arrow key again to highlight "Auto Calibration" (as shown on
		the left) and press Enter (F4).
		NOTE
		There are three buffer groups that may be selected. Automatic
		buffer recognition includes temperature curves from 0 to 60°C.
		a. Standard: Includes NIST (US), BSM (Britain), JIS 8802 (Japan) and
		DIN 19266 (Germany) buffers. See Table 5-2 for details.
		b. DIN 19267: 1.09/4.65/6.79/9.23/12.75
		c. Manual: (for manual calibration) disables automatic buffer recognition
		and stabilization.

Autocal: Standard

Stabilize pH: 0.01 pH

Stabilize time: 10 sec

ExitEdit

2.	Menu Item	Options
	Autocal	Standard/ DIN 19267/ Manual
	Stabilize pH	0.01-0.50 pH
	Stabilize time	0-30 sec

The values now being used by the controller are displayed. To change any of these items, use the arrow key to highlight the desired item and press Edit(F4). Use the arrow keys to make the change and press Save (F4) to enter the change into memory.

The pH reading must not change by more than the stabilize pH value over the stabilize time to be considered stable. Using a smaller pH value and a larger time provides the best protection against calibration while the reading is still changing.

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