6
Table 1.2 − pH-meter temperature compensation range
Type of electrodes used
pH-meter
temperature
compensation
range,
С
ЭСК-10601/7(К80.7) combined glass electrode
from 5 to 50
ЭСК-10601/4(К80.7) combined glass electrode
ЭСКЛ-08М combined laboratory glass electrode
ЭСКЛ-08М.1 combined laboratory glass electrode
201020/51-10-04-22-120/000 combined pH-electrode with gel filler
ЭС-10601/7(К80.7) glass electrode
ЭС-10601/4(К80.7) glass electrode
ЭСр-10101-3,0(К80.4) reference electrode
ЭСр-10103-3,0(К80.4) reference electrode
ЭСЛ-43-07СР laboratory glass electrode
from 5 to 40
ЭВЛ-1М3.1 laboratory auxiliary electrode
1.2.6 Operating conditions:
ambient air temperature,
С …………..……………. from plus 5 to plus 50;
ambient air relative humidity at temperature of plus 35
С and below
without moisture condensation, %, maximum ……………………………....……... 80;
atmospheric pressure, kPa (mm of Hg) ………………... from 84.0 to 106.7
(from 630 to 800).
1.2.7 The pH-meter is powered up from a self-contained power supply with
voltage 2.4 to 3.4 V (two AA alkaline dry cells) or two nickel-metal hydride batteries
(AA).
1.2.8 Power consumption at rated supply voltage of 3.0 V, mW, maximum:
with display illumination off ………..………………………………............ 20;
with display illumination on …………………………………….………… 300.
1.2.9 The electrode system in the pH-meter may be set to the parameters
shown in Table 1.3.
Table 1.3 − Parameters of electrode system
Slope of electrode system hydrogen curve in the
linear part thereof, at least (in absolute figures)
Coordinates of electrode
system isopotential point
Е
i
, mV
pH
i
, pH
-52.2 mV/pH (at temperature of 20
С)
0±30
4.0±0.3
18±30
6.7±0.3
0±45
7.0±0,3
1.2.10 Dimensions and weight of the pH-meter main components are shown
in Table 1.4.