Hach H120, Operating Instructions

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5600 Lindbergh Dr., Loveland, CO 80539
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(800) 227-4224 (U.S.A. only)
Fax (970) 669-2932
orders@hach.com • www.hach.com
International customers:
Tel +001 (970) 669-3050
Fax +001 (970) 669-2932
intl@hach.com
Model H120
pH Meter with Silicon Chip Sensor
IQ Scientific Instruments
Calibration and Measurement Instructions
Parts
When finished, always rinse the probe and replace the protective cap.
C
Remove cap from probe
tip and turn on the meter. Rinse the probe in tap
water and blot dry. Apply one drop of 7.00
buffer to the probe tip. Be
sure to cover both the
reference junction and the
pH sensor. Depress the CAL 1 button
with the tip of the clip. The CAL and 7.0 will flash
until a stable reading is
obtained. When the CAL
disappears and 7.0 stops
blinking, calibration is
complete. Rinse the probe in tap
water and blot dry.
To measure the pH of a
sample, go to Step 7. Now measure the sample
pH by placing a single
drop on the probe tip or
dipping the probe tip
into solution.
1
2
3
4
5
6
7
6. Protective Cap 7. Clip
8. Bubble
9. POWER Button
10. CAL 1 Button
1. Probe Tip pH sensor and reference electrode.
2. pH Sensor Fast response silicon chip pH sensor with built-in temperature sensor.
3. Reference Electrode Replaceable saturated KCl Ag/AgCl electrode.
4. Reference Junction Measurement is made when the reference junction and the pH sensor are
immersed in the solution.
5. LCD Display CAL (blinking): Calibration in process. Measurement cannot be made.
CAL (off): Measurement can be made.
BAT : Low battery indicator. Replace batteries.
6. Protective Cap Always replace the cap after use.
7. Clip Use the tip of the clip to depress the CAL button.
8. Bubble The reference solution bubble indicates the life of the reference electrode.
9. POWER Button Press to turn the meter on or off.
10. CAL 1 Button Button for pH 7.0 calibration.
1. Probe Tip
2. pH Sensor
3. Reference Electrode
4. Reference Junction
5. LCD Display
OPERATING INSTRUCTIONS
pH Sensor
Reference Junction
DOC022.53.80059
mini_man_H120 9/8/09 9:26 AM Page 1