Справочник Пользователя для Hanna Instruments hi 9931

OVERDOSAGE TIMER

HI 9931 and HI 9934 provide for an overdosage alarm system. The
operator can set the maximum amount of time that the dosage
terminals should continuously remain activated from 1 to 10 minutes
. Should this period elapse, the alarm
terminals are activated (and dosage
disactivated to ensure that fertilizers or chemi-
cals have not run out or pumps or
electrovalves have not ceased to function
properly).

TIMER

MINUTES

2.5

7.5

PREPARATION

Make sure that the protective sleeve is on the probe shaft and that
the air-vent holes are on the top (nearer to the cable).

STORAGE

The conductivity/TDS probes should be stored dry. If the probes are
not to be used for a while, clean and dry them throroughly (see
below) before storing them in a dry store room.

PERIODIC MAINTENANCE

Inspect the probe and the cable. The cable used for the connection to
the controller must be intact and there must be no points of broken
insulation on the cable or cracks on the probe sleeve.
Connector must be clean and dry. If any cracks are present, replace
the probe and cable.

CLEANING PROCEDURE

Remove the sleeve and soak the probe in a Hanna HI7061 General
Cleaning Solution for 1 hour. Wash the sleeve with plenty of water
and remove any dirt.
If the probe has been left in highly concentrated fertilizer solution and
does not seem to become clean, repeat the cleaning procedure.
The rings can also be cleaned with a cloth. Make sure that the cloth
is made of a soft and non-abrasive material and does not scratch the
rings.

PROBE CLEANING

& MAINTENANCE