Nahita 910/5, Руководство пользователя

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ENGLISH CASTELLANO
Conductivity cell 0.01 0.1 1.0 10.0
constant (cm
-1
)
Approx. concentration of 0.001 0.001 0.01 or 0.1 0.1 or 1
KCl solution (mol/L)
Page 26 Instruction manual 50910050 Version 1 June-07
Calibration
Calibration of the conductivity cell
Each conductivity cell presents a specific constant value; if user thinks that the value
indicated by the factory is not correct, proceed as follows:
Select the right standard solution depending on the constant value of the cell:
Š
KCl standard solution to be used depending on the cell constant value
Chart for preparation of the KCl standard solutions.
Concentration (mol/L) KCL concentration (g/L) at 20ºC
1 74.2650
0.1 7.4365
0.01 0.7440
0.001
Dissolve 100 mL of the 0.01 mol/L solution in 1 L
Connect the conductivity cell to the equipment and disconnect the temperature probe;
this way, the conductivity value displayed will be the original value without temperature
compensation.
Turn the conductivity meter by pressing ON/OFF (1.2)
Clean the conductivity cell with distilled water.
Submerge the conductivity cell in the standard solution. Control the temperature of the
standard solution to be (25.0±0.1) ºC, (20.0±0.1) ºC, (18.0±0.1) ºC or (15.0±0.1) ºC.
Select the level of the constant value (0.01, 0.1, 1.0, 5.0 or 10.0) (see Parameter adjus-
tment; conductivity cell constant adjustment) and press ENTER/PRINT (1.4) .
Press MODE/MEAS (1.3) to return to the measuring mode.
Press again MODE/MEAS (1.3)
With /C/T/S (1.5) or /SAVE (1.6) select "CAL" on display.
Press ENTER/PRINT (1.4) to enter the calibration mode.
When the reading on display is stable, press ENTER/PRINT (1.4) . "CA-M" will be dis-
played.
With /C/T/S (1.5) (increase) or /SAVE (1.6) (decrease) introduce the exact value of
conductivity according to the following chart:
Š
Š
Š
Š
Š
Š
Š
Š
Š
Š
S
S
S
S
Š
Exact value of conductivity regarding the approximate concentration of the KCl standard solu-
tion.
Revisión 1, Junio-07 Manual de instrucciones 50910050 Pág. 7
Rango de conductividad
( S/cm)
Rango de resistividad
( cm)
Constante recomendada
de la célula de conductivi-
dad (cm
-1
)
μ
0.01, 0.1
0.1, 1.0
1.0
1.0, 10
10
Ω Ω
B) Selección de la constante según el rango de TDS
Rango de Conductividad
( S/cm)
Constante recomendada
de la célula de conductivi-
dad (cm
-1
)
0-1000
1000-10000
1000-19990 0-2000
2000-20000
2000-40000 1.0
1.0, 10
10
μ
C) Para determinaciones de salinidad se recomienda utilizar siempre una célula de
constante 10 cm
-1
.
3. Conexión de la sonda de temperatura
4. El equipo se suministra con una sonda de temperatura
(1.8) , conecte dicha sonda en la clavi-
ja correspondiente (2.2) de la parte trasera del equipo.
Encienda el conductímetro presionando el botón ON/OFF (1.2) . Al cabo de unos segun-
dos el equipo estará listo para operar.
Selección del modo de trabajo
El conductímetro Nahita 910/5 le permite la determinación de:
a. Conductividad ( S/cm)
b. TDS, sólidos totales disueltos (mg/L)
c. Salinidad (%)
Mediante el botón /C/T/S (1.5) seleccione el modo en el que desea trabajar:
- Cuando seleccione el modo Conductividad en pantalla visualizará "CON"
Š
S
120.1
CON
uS / cm
16.8 ºC
0.05-2
2-200
200-2000
2000-20000
2000-2x10
5
20x10
6
-500x10
3
500x10
3
-5x10
3
5x10
3
-500
500-50
500-5
Rango de TDS (mg/L)
μ