20
when brought into a warm room from the cold air, prior to enabling, hold
the analyzer at room temperature for at least 1 hour in order for condensed mois-
ture to evaporate.
2.5 Functional check
A serviceable analyzer should meet the following requirements:
with the sensor placed in the null solution, the analyzer readings stay
within ± 50 µg/dm
3
;
when outside air calibration is accomplished, (para.2.3.4) neither
Е3
nor
Е4
is displayed
on the screen
and readings
C
cal
, mg/dm
3
, are set with an accuracy
±1 % of the calculated value defined with the formula:
325
,
101
)
(
2
atm
cal
Р
t
Со
С
,
where
Со
2
(t
solubility of 100 % humidity air oxygen in distilled water, at
temperature t, °С, and normal atmospheric pressure of 101,325 кPa as per Ta-
ble A.1
)
, mg/dm
3
;
Р
atm
atmospheric pressure as of the time of calibration, kPa.
2.6 Troubleshooting
2.6.1 The typical faults of the analyzer and remedial methods are summa-
rized in Table 2.2.
In case of troubles set out in Table 2.2, proceed as recommended in the
Remedy column, in accordance with the clauses given below and Fig.1.1 and 2.3.
Table 2.2
Trouble, symptoms
Probable cause
Remedy
1 With power on, no read-
ings are displayed
Poor battery contact
Open the battery com-
partment and clean con-
tacts
Supply voltage below
acceptable level
Para.2.3.1 Replace bat-
teries
2 With power on, all or ran-
dom segments and charac-
ters
illuminate
on
the
screen
Dead batteries
Para.2.3.1. Replace bat-
teries
