Emerson PN 51-FCL-1056 instruction manual ZeroBufferCalCal, Auto

MODEL FCL-1056	SECTION 6.0
	CALIBRATION

5.USER ENTERED SLOPE AND OFFSET. If the slope and offset are known from other measurements, they can be directly entered in the analyzer. Enter the slope as a positive number corrected to 25ºC. To calculate the slope at 25ºC from the slope at temperature tºC, use the equation:

slope at 25ºC = (slope at tºC)

298

tºC + 273

To calculate the offset use the following equation. The offset can be either positive or negative.

offset = mVbuffer - (pHbuffer - 7.00)(slope at 25ºC)

6.STABILITY SETTING. During automatic calibration, the analyzer measures noise and drift and does not accept calibration data until readings are stable. Calibration data will be accepted as soon as the pH reading is constant to within the factory-set limits of less than 0.02 pH change in 10 seconds. The stability settings are programmable.

6.4.3 Procedure-Auto Calibration

1.Obtain two buffer solutions. Ideally, the buffer pH values should bracket the range of pH to be measured.

2.Remove the sensor from the flow cell. If the process and buffer temperatures are appreciably different, place the sensor in a container of tap water at the buffer temperature. Do not start the calibration until the sensor has reached the buffer temperature.

Calibrate?

Sensor 1

SensorSensor22

Output 1

Output 2

3.Press MENU. The main menu screen appears. The cursor will be on Calibrate. Press ENTER.

4.Choose the sensor you wish to calibrate. Sensor 1 is the chlorine sensor. Sensor 2 is the pH sensor.

S2 Calibration

pHpH

ORP

Redox Temperature

S2 pH Cal

ZeroBufferCalCal

Standardize

Slope: 56.19 mV/pH

Offset: 2mV

5. Choose pH.

6.Choose Buffer Cal

S2 pH Buffer Cal

Auto

Manual

7. Choose Auto.

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