Hanna-instruments HI 9835 User Manual download pdf (Page 5)

EC/TDS CALIBRATION

EC/TDS calibration is a single point procedure. Selectable calibration

points are: 0.0, 84.0 μS/cm, 1413 μS/cm, 5.00 mS/cm, 12.88

mS/cm, 80.0 mS/cm,111.8 mS/cm.

To enter EC calibration, select the EC range and

press the CAL key.

Note: TDS reading is automatically derived from the EC reading and

no specific calibration for TDS is needed. Pressing CAL while TDS

range is selected has no effect.

Rinse the probe with some of the calibration solution or

deionized water. Immerse the probe into the solution.

The sleeve holes must be completely submerged. Tap

the probe repeatedly to remove any air bubbles that

may be trapped inside the sleeve.

For zero calibration, just leave the dry probe in air.

The indications "BUF" and "CAL" are dis-

played. The upper LCD shows the uncalibrated

EC reading. The lower LCD shows the buffer

value. The stability indicator " " blinks.

Select the desired value with the ▲

and ▼ keys, if necessary.

When the " " symbol stops blinking, the

reading is stable. The "CON" indication starts

blinking on the LCD asking for confirmation.

Press ALT + CFM to confirm the calibration.

If everything is satisfactory, the meter displays the "Stor Good"

message and returns to measurement mode.

Notes

I If the uncalibrated reading is too far from the expected value,

calibration is not recognized. The "CON" indication does not

appear; the " " and "BUF" symbols blink to warn the user.

II For best results choose a calibration solution with an EC value

as close as possible to the sample to be measured.

TEMPERATURE COMPENSATION

Three options of compensating temperature are available:

Automatic (Atc): The probe has a built-in temperature sensor; the

value of the temperature is used to automatically compensate the EC/

TDS reading using 25°C as reference temperature. This is the default

option.

Manual (Mtc): The temperature value, shown on the lower LCD, can

be manually set by the user with the up and down arrow keys. The

compensation is referenced at 25°C. The "°C" symbol blinks when this

option is active.

No Compensation (notc): The temperature reading shown on the

lower LCD is not taken into account. The reading displayed on the

upper LCD is the actual EC or TDS value. The "°C" and "%TC" symbols

blink when this option is active.

To select the desired option press the ATC key until

the option is briefly displayed on the LCD.

Note: The default compensation mode is ATC.

If temperature compensation is active, measurements are compen-

sated using a default temperature coefficient of 1.90 %/°C.

It is possible to select a different temperature coefficient (TC) in the

0.00 to 6.00 %/°C range by entering the setup mode and selecting

the "tc" item (see SETUP for details).

The current temperature coefficient can be

quickly viewed pressing ALT+TC. The value

is briefly displayed on the lower LCD.

The EC and TDS scales are autoranging. The meter automatically sets

the scale with the highest possible resolution.

By pressing ALT+FIXED, the autoranging

feature is disabled and the current range

is frozen on the LCD. "F1" symbol blinks

on the LCD.

To restore the autoranging option press ALT+FIXED again.

Note: Autoranging is automatically restored if the RANGE key is pressed,

if the setup or calibration modes are entered and if the meter is

turned off and back on again.

AUTORANGING

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Hanna-instruments HI 9835 User Manual Page 5

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