Delta OHM HD37AB1347, Руководство пользователя

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4.
The probe and the saturated solution for this operation should have the same temperature ,
and therefore should be located in a room with a stable temperature for the entire calibration
period.
5.
Unscrew the probe protection; screw the M12×1 threaded ring.
6.
Should there be any liquid inside the measuring chamber,
dry it with some blotting paper. The formation of liquids
inside the measuring chamber, does not impair the
measurement uncertainty of the solution or measurement.
7.
Screw the ring to the container with the saturated solution.
Avoid any contact of the sensitive element with your hands or
another object or liquid.
8.
Once the sensor has been inserted, wait at least 30 minutes, if
the probe and salts have the same temperature. Otherwise you
should wait the time necessary to reach a balance.
9.
After 30 minutes, press ENTER. The new calibration value
has been captured by the probe connected to the instrument.
10.
Once the measurements have been acquired, repeat the same
operations backwards.
11.
To check the second calibration point, repeat the operations
from point 1 to point 10.
Notes and warnings:
I. Store the salt solutions in a dark environment at a constant temperature of about 20°C.
II. The salt solutions are efficient and can be used until they have some salt to be dissolved and
liquids. Usually, for the 33% RH and 11% RH solutions, you need to check the presence of salt
in solid state, while for the 75% RH solution, you need to check the presence of liquid or wet
salt.
III. In order to perform the best calibration, the temperature of the probe and of the solution should
be as close as possible. Remember that plastic materials are bad heat exchangers. Any
difference of tenths of degrees between sensors and salt saturated solutions can give errors in
the RH measurements.
IV. Do not let hands or anything touch the sensitive element. Scratches or dirt alter the instrument
measurement and can damage the sensor.
V. The measuring chamber must be closed, otherwise it will not reach a balance. Screw the probe
all the way in the container thread.
VI. The tuning or calibration sequence of Delta Ohm instruments is as follows:
•
First solution: 75% RH.
•
Second solution: 33% RH.
•
The checking order is not mandatory.
VII. If the check, tuning or calibration, is performed at a different temperature than 20°C, the salt
solution relative humidity reference value corresponding to the working temperature is outlined
in the following table. The table indicates the relative humidity variation of the saturated salt
according to the temperature variation.