Compaq MTEK6000 user manual Calibration Mode, Calibrating the Pressure Transducer

MTEK6000 SERIES USER'S MANUAL

CALIBRATION MODE

Calibration mode allows the user to calibrate any of the analog signals, such as the pressure transducer or the temperature probe. While operating in the calibration mode, the MTEK6000 continues to store pulses and periodically updates volume, pressure, and temperature data using the values measured when calibration mode was initially entered. Once in calibration mode, the user can perform the following operations:

1.Calibrate zero only.

2.Calibrate span only.

3.Calibrate both zero and span.

Of course, the option to change the calibration reference points is available at all times. Several other features make the software calibration routine attractive and more intuitive. In the MTEK6000, unit calibration is software-based; there is no need for laborious operator adjustments. Software calibration does away with the need for repetitive potentiometer adjustments, thereby simplifying field calibration procedures.

In order to perform calibration, you will need a pressure source, temperature source, and accurate reference indicators. You will also need the Metretek, Inc. Virtual keypad or the optional external keypad and display.

Calibrating the Pressure Transducer

NOTE

Pressing esc repeatedly from anywhere within the calibration procedure will back the operator out of calibration mode.

3-10

1.Display the line pressure by pressing F3 or jumping to 030302.

2.Press cal. Enter your password at the optional PASSWORD? prompt, if required.

3.The unit will enter calibration mode. The display will alternate between CALIBRATING and the parameter label (Pressure for example).

4.Close the shut-off valve between the pressure source and the pressure transducer.

5.Open the pressure sensing line on the unit to the atmosphere, and wait until the line is fully vented and the reading is stable.

6.Press zero. The display now shows:

ZERO> XX.XXX

NEW?>

XX.XXX represents the unit's default zero value. If the current zero reference matches the unit's default, simply press ent to collect the new point. Otherwise, key in the value of the current reference before pressing ent. The unit should display Calculating . . .

briefly, and then display the new point. Pressing esc instead of ent at this point aborts the operation and returns you to the calibration prompt.

7.Apply the span (full scale) reference to the pressure sensor and wait for the reading to stabilize

8.Press span. The unit now shows:

SPAN> XX.XXX

NEW?>

January 2002