Dot-x SERIES Especificações descarregar pdf (Página 47)

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Part 7 – Calibration

7.1 Oxygen Calibration

Once power is applied, the sensor must be given time to stabilize. This is best

done by following the zeroing procedure below. Establishing a stable zero is

critical to the proper operation of the monitor. A complete calibration will include

zeroing and spanning the sensor. It is generally unnecessary to set the zero at

every calibration, however, it should be done during the initial installation.

7.11 Oxygen Span Cal

The system provides three methods of D.O. calibration: 1-Point (sample), and

% Saturation (air cal), and Zero. These three methods are significantly different.

It is important to note that ONLY the Air Calibration method outlined in

section 7.13 may be used to calibrate a D.O. monitor that has been

programmed as “Instrument Type 3” in the configuration menu. This type

of instrument is designed to measure % Saturation and must be calibrated

in air using ambient air as a 100% saturation standard.

7.12 Dissolved Oxygen Span Cal (1-spl)

The 1-Point (sample or comparison) method is intended to be primarily used as

an on-line calibration; however, the sensor can be removed, cleaned and then

calibrated in a bucket of clean water if necessary. During calibration, the system

will display the current ppm reading and the user can manually enter a reference

value from a lab sample or comparative reference instrument. In the DOTX-45

system, the 1-Point calibration adjusts the slope of the sensor output response.

1. Determine whether the calibration will be done on-line or with the sensor

removed and placed into a bucket of clean water. If the sensor is removed

from the application, rinse and clean if necessary.

2. If the sensor has been removed and placed into a bucket of water, allow

sensor to temperature equilibrate with the solution as much as possible. With

the sensor coming from an application which differs greatly in temperature,

the user may have to wait as much as 20 minutes. If the sensor is on-line, the

user may want to set the output HOLD feature prior to calibration to lock out

any output fluctuations.

3. Scroll to the CAL menu section using the MENU key and press ENTER or the

UP arrow key. Cal DO will then be displayed.

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Dot-x SERIES Especificações Página 47