Hach-Lange SENSION+ PH1 - Manual (Page 13)

9
5. Operation
ENGLISH
5.1. Measurement
Note: the instrument must be calibrated before reading
the first pH value.
1. Press to turn on the instrument.
2. Remove the electrode protector.
3. Clean the electrode with deionized water.
4. Stir the electrode uniformly in the sample, holding it
by the top.
5.1.1. Stability measuring
Follow the diagram.
The reading is not locked on the screen until the elec-
trode signal varies less than 0.01 pH (0.5 mV) for 6
sec.
Once the reading has stabilized, the screen will light
up for 2 sec.
5.1.2. Continuous measuring
Once stability measuring has begun, press the key
twice .
The instrument displays the measured value directly on
screen at all times.
The continuous reading should always be started after
beginning a stability reading (see diagram).
To end a continuous reading, press
.
The display will light up for 2 sec.
Note: If the measuring instrument is not used for 5 min-
utes, it will shut off automatically.
2 s
+
Stability
measuring
Continuous
measuring
5.2. Changing measuring units
(pH/mV)
To change the units of measurement from pH to mV
or vice versa.
2 s
in Stability measuring, hold down the
key for 2 s
sensION+ PH1_HACH_LANGE_0710.indd ANG:9 sensION+ PH1_HACH_LANGE_0710.indd ANG:9 7/9/10 15:40:43 7/9/10 15:40:43