Crison MultiMeter 44 Manual Del Usuario página 34

Operation
4.7.3 Calibration
32
Temperature: from the own channel.
•
Relays for limits and alarm: deactivated.
•
4-20 mA output for DO and temperature: deactivated.
•
Hold. Last value.
•
To modify the factory programming and adapt the instrument to the application:
Note: During programming, the relays of the corresponding channel are deactivated. 4-20 mA
output (register) is in Hold (21 mA or last value).
1. Press to access to the
ESC
2. Introduce the code
100
3. Select . Press
SYSTEM
4. Select
PROGRAM CHANNEL
5. Select and modify the following options:
Option Description
%, ppm
Units
Temperature sensors from other channels.The temperature compensation
can be carries out using the temperature value measured in any of the other
Temperature
two channels.
Atmospheric pressure: standard value 1013 mBar.
Pressure
Salinity, 0.0 g/L NaCl.
Salinity
Selection of the type of control and the limits values.
NO: indicates that no control with relays will be used.
Relay control
See detailed information on
Alarm.See detailed information on
Alarm
4-20 mA output,
4-20 mA output for DO. See detailed information on
dissolved oxygen
4-20 mA output,
4-20 mA output for Temperature. See detailed information on
º C
Selection of the current output (register) when the channel is in situation of
Hold
cleaning, programming or calibration with standards.
Calibration in air, relative humidity at 100 %
The calibration is carried out in one point. Normally in air saturated with water vapor, with
100% of relative humidity. This can be achieved by introducing the sensor in a vessel with
some distilled water, maintaining the sensor few centimeters far from the water to avoid
wetting the membrane.
Before calibration for the first time, the electrode must be polarized at least 6 h.
To carry out a calibration in air, the sensor must be clean and dry. The small droplets from
the membrane must be eliminated. The electrode should be re-calibrated when:
The sensor, clean and dry, in air gives a reading different from 100% of saturation.
•
After replacing the membrane or the electrolyte.
•
.
MAIN MENU
and accept with
OK
to confirm
OK
and then the channel to configure.
4.13, Page
N O T I C E
49.
4.12, Page 48
4.14, Page 51.
4.14, Page 51.