Emerson MSM400 Rechecking Zero, Calibration Methods Auto CAL Auto CAL Zero Setting Procedure

6.2RECHECKING ZERO

It is recommended that the zero is checked regularly. The frequency of re-calibration is dependent on the process. However, it is suggested that this be done at least every 6 months.

CALIBRATION METHODS

AUTO CAL

6.3AUTO CAL - ZERO SETTING PROCEDURE

AUTOCAL is a simple step by step calibration routine in which the user is guided through the calibration process by a series of user friendly screens. AUTOCAL is the recomended calibration proceedures.

The attenuation of the ultrasonic signal in dean liquid varies slightly from sensor to sensor. For optimum system accuracy it is important to set up this zero loss accurately. When the system has been installed, immerse the sensors in the clearest liquid available. If this is not practical, choose a point in the cycle when the liquid in the gap between sensors has the lowest possible % suspended solids. For example on sewage treatment plants wash water would be acceptable.

Firstly enable access using the “TOGGLE RUN” command in the MAIN MENU.

Highlight the CALIBRATION option in the MAIN MENU by pressing the down arrow key.

	MAIN MENU	0
TOGGLE RUN		0
CALIBRATION
SETUP

Press ENT.

CALIBRATION 0

AUTOCAL0

MANUAL ENTRY

Max %

Highlight the AUTOCAL option by pressing the down arrow key, and press ENT.

CALIBRATION 0

AUTOCAL0

MANUAL ENTRY

Max %

Highlight the SETZERO option and press ENT. The following will show on the display.

CALIBRATION	0
SETZERO Max %	0

SETSPAN

LAB VALS

Follow the instruction, the display will show the following

	SET	ZERO	0
In clear liquor			0
Press		⇒

IP258

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