MODEL 54eA

SECTION 5.0

 

SOFTWARE CONFIGURATION

5.11MAIN SENSOR CALIBRATION PARAMETERS

1.Main sensor refers to the amperometric sensor.

Noise rejection

Main sensor cal

Security

ExitEnter

Stabilize : 0.050 ppm

Stabilize time: 10 sec

ExitEdit

Stabilize: 0.050 ppm

Stabilize time: 10 sec

Dual range cal : Disable

ExitEdit

Stabilize: 0.050 ppm

Stabilize time: 10 sec

Salinity : 0.0 o/oo

ExitEdit

2.Press any key to enter the main menu. Move the cursor to "Program" and press Enter (F4).

3.Move the cursor to "Configure" and press Enter (F4).

4.Move the cursor to "Main sensor cal" and press Enter (F4).

5.Use the é and ê keys to move through the list of items. To make a change press Edit (F4). Use the arrow keys to change settings to the desired value and press Save (F4). For allowed ranges, see Table 5-1.

The choices depend on the measurement being made.

Stabilize and Stabilize time: For the controller to accept calibration data, the concentration must remain within a specified range for a specified period of time. The default values are 0.05 ppm (50 ppb) and 10 seconds. Using a small stabilize value and a long stabilize time is the best protection against calibration while a reading is still changing.

Dual range cal: Free and total chlorine sensors from Rosemount Analytical (Model 499ACL-01 and 499ACL-02, respectively) become non-linear at high concentrations of chlorine. Dual range calibration allows the analyzer to correct for the non-linearity of the sensor. For more information see Sections 8.0 and 9.0.

Salinity: Salinity is used with oxygen measurements only. The solu- bility of oxygen in water depends on the concentration of dissolved salts in the water. Increasing the concentration decreases the solu- bility. If the salt concentration is greater than about 1000 ppm, the

accuracy of the measurement can be improved by applying a salini- ty correction. Enter the salinity as parts per thousand (o/oo). One per- cent is ten parts per thousand.

43

Page 49
Image 49
Emerson Process Management 53eA instruction manual Main sensor cal