Specifications

MODEL 30 pH/DO SECTION 6.0
CALIBRATION
37
6.3.4 Procedure — Calibrating the sensor against a standard instrument
The analyzer and sensor can be calibrated against a standard instrument. For oxygen sensors installed in aera-
tion basins in waste treatment plants, calibration against a second instrument is often preferred. For an accurate
calibration be sure that…
1. The standard instrument has been zeroed and calibrated against water-saturated air following the manufac-
turer's instructions.
2. The standard sensor is immersed in the liquid as close to the process sensor as possible.
3. Adequate time is allowed for the standard sensor to stabilize before calibrating the process instrument.
1. Press MENU. The main menu screen appears. Choose Calibrate.
2. Choose Sensor 1 (dissolved oxygen). For a single sensor configuration,
this screen will not appear.
3. Choose Measurement.
4. Choose InProcess.
5. The screen at left appears. The top line is the current dissolved oxygen
reading based on the previous calibration. Change the reading in the sec-
ond line to match the standard instrument. Press ENTER.
6. The display returns to the screen shown in step 4. Press MENU followed
by EXIT to return to the main display.
CCaalliibbrraattee
Hold
Program Display
Calibrate?
SSeennssoorr11
Sensor2
CalSensor1?
MMeeaassuurreemmeenntt
Temp
Live 10.00ppm
CalS1
11
0.00ppm
Cal S1? AirCal
IInnPPrroocceessss
Zero