Emerson 51-DO-03, 51-DO-04 Section Calibration Current Outputs, Trimming the Outputs

MODEL DO-03/04	SECTION 8.0
	CALIBRATION - CURRENT OUTPUTS

SECTION 8.0

CALIBRATION - CURRENT OUTPUTS

8.1 INTRODUCTION

Although the analyzer outputs are calibrated at the factory, they can be trimmed in the field to match the reading from a standard current meter. Both the low output (0 or 4 mA) and the high output (20 mA) can be trimmed.

8.2 TRIMMING THE OUTPUTS

Adjust temperature Calibrate pH Output trim

ExitEnter

CAUTION: Current outputs may be affected

1.From the main display, press any key to obtain the main menu. With the cursor on "Calibrate" press Enter (F4).

NOTE

If Hold was enabled in Section 5.6, the hold screen will appear. To activate hold, refer to Section 5.6, step 11.

2. Move the cursor to "Output trim” and press Enter (F4).

3.The warning screen reminds the user that the output currents will be affected. Pres Cont (F3) to continue.

Abort Cont

Trim output 1 Trim output 2

4.Use the ￿ or ￿ keys to move the cursor to the desired output and press Enter (F4).

ExitEnter

Cal point : 1

Meter: 4.00 mA

Expected: 4.00 mA

Simulating output1

ExitEdit

5.Select “Cal point 1” (0 or 4 mA) or “Cal point 2” (20 mA).

6.Move the cursor to “Meter” and press Enter (F4). Measure the output current with a calibrated ammeter. Use the ￿ or ￿ keys to change the display to match the ammeter reading and press Save (F4).

7.Move the cursor to the other “Cal point” and select it. Repeat step 6.

NOTE

If Hold was activated during calibration, “Hold Mode Activated” will continue to flash in the main display. Return the sensor to normal and deactivate Hold. Refer to Section 5.6, step 11.

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