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Idiomas disponibles
Idiomas disponibles
°C/°F - If this key is pressed it changes the temperature measuring unit to
degrees Celsius or degrees Fahrenheit.
- When pressed together with the CAL key it activates the manual tempera-
ture setting function.
- If pressed during the conductivity calibration function it quits the calibra-
tion function without storing the calibration.
χ
When pressed together with the CAL key it activates the conductivity cali-
bration function.
OK
Confirms the programming parameters, or the relay SET values, and stores
them.
CAL - When pressed together with the °C/°F key it activates the manual tempe-
rature setting function.
- When pressed together with the
bration function.
- Key used to confirm conductivity calibration and manual temperature cali-
bration.
s
- Key for increasing the value displayed in the parameter programming
phase.
- During the relay SET point programming phase.
- During the calibration phase.
t
- Key for decreasing the value displayed in the parameter programming
phase.
- During the relay SET point programming phase.
- During the calibration phase.
Setting the relay SET point
- Press the SET button; the ON symbol appears on the display with the letter A
to indicate that the value shown corresponds to the switching on threshold of
relay A.
s
- To change this value press the
and
- Press SET; the OFF symbol appears with the letter A to indicate that the swit-
ching off threshold of relay A is being displayed.
s
- To change this value press the
and
- Press the SET button; the ON symbol appears on the display with the letter B
to indicate that the value shown corresponds to the switching on threshold of
relay B.
s
- To change this value press the
and
- Press SET; the OFF symbol appears with the letter B to indicate that the swit-
ching off threshold of relay B is being displayed.
s
- To change this value press the
and
- Press SET, the instrument stores the values and returns to normal function.
NOTE: During the SET point setting phase (symbols ON or OFF lit) the instru-
ment returns to normal function if no key is pressed for 2 minutes.
Manual temperature setting
If the temperature probe is not connected or if the probe is broken the measuring
unit °C or °F flashes. In this case it is possible to set the temperature compensa-
tion value manually.
- Press the CAL key and the °C/°F key together; the message CAL appears at
the bottom of the display.
s
t
- Using the
and
keys, set the temperature value corresponding to the tem-
perature of the liquid in which you wish to measure conductivity.
- Press CAL to confirm this value. The message CAL disappears.
Calibration of the AGSELECT-RCD/BCD with conductivity probes
Calibration of the DO 9786T/DO 9766T transmitters with conductivity probes:
- Immerse the probe in the buffer solution used for calibration.
χ
- Press the CAL key and the
key together; the message CAL appears at the
top of the display.
- The instrument can automatically recognize two standard calibration solutions: a
0.1 molar solution of KCl and a 0.01 molar solution of KCl. The instrument pro-
poses the conductivity value as a function of the measured temperature if the
temperature probe is connected, or the manually set temperature.
s
t
- Using the
and
keys, adjust the conductivity value measured as a function
of the liquid temperature.
- Press CAL to confirm this value. The message CAL disappears.
NOTE: If you want to quit without storing the new calibration, press the °C/°F key.
N.B.: Before calibrating the probe set a cell constant close to the cell constant of
the probe that you with to calibrate with key PRG, function P2. If the mes-
sage E1 appears during calibration, the instrument is indicating that the
probe gain is too high; quit programming (°C/°F button) and increase the
value of the cell constant. Likewise, if E2 appears, the instrument is indica-
ting that the probe gain is too low; quit calibration and decrease the cell
constant. Repeat the calibration operation.
Programming the parameters
P1 Temperature coefficient. May be set between 0 and 4.0%/°C (0 and
2.2%/°C).
P2 Cell constant. May be set between 0.01 and 199.9.
P3 Conductivity value corresponding to 4 mA at output. May be set between 0
and 199.9 mS.
P4 Conductivity value corresponding to 20 mA at output. May be set between 0
and 199.9 mS.
χ
key it activates the conductivity cali-
t
keys.
t
keys.
t
keys.
t
keys.
P5 Delay time in the intervention of relay A. May be set between 0 and
250 seconds.
P6 Delay time in the intervention of relay B. May be set between 0 and
250 seconds.
P7 Reference temperature of the conductivity measurement. May be set
between the values 20.0 or 25.0°C.
P8 Calibration of Pt100 probe and calibration of analog output in current (see
Pt100 probe calibration and analog output calibration).
To change one of these parameters (except P8) press key PRG until the messa-
ge corresponding to the parameter to be changed appears on the screen. Using
s
t
the
and
keys, bring the parameter displayed to the desired value. Press OK
to confirm.
Pt100 probe calibration
- Connect the Pt100 probe to the instrument. Press the PRG key until the messa-
ge P8 appears on the display.
- Press the CAL key; the message CAL appears at the bottom of the display and
the temperature is shown at the top.
- Immerse the Pt100 probe and a precision thermometer for reference in the zero
calibration bath. Wait long enough for the reading to become stable.
s
t
- Using the
and
keys, adjust the value of the temperature measured by the
Pt100 probe so that it corresponds with the value on the reference thermometer.
- Immerse the Pt100 probe and a precision thermometer in the full scale calibra-
tion bath. Wait long enough for the reading to become stable.
s
t
- Using the
and
keys, adjust the value of the temperature measured by the
Pt100 probe so that it corresponds with the value on the reference thermometer.
- Press OK to confirm.
N.B.: If the temperature shown by the instrument is between +12°C, the instru-
ment calibrates the probe offset, otherwise it calibrates the gain.
Fig. 1
conductivity
4 electrodes
20
19
18
17
µS mS / cm
16
Pt100 4 wires
15
14
13
12
temp
SHORT CIRCUIT BETWEEN 10 AND 11 IF NOT CONNECTED
*
conductivity
2 electrodes
20
19
18
17
µS mS / cm
16
Pt100 2 wires
15
14
13
12
temp
Fig. 2
1
24 Vac
2
1
2
Fig. 3
5
24 Vac
or
230 Vac
≈
=
11
GND
10
4...20mA
9
mA
8
B
7
6
5
A
4
3
1
2
11
10
4...20mA
V+
9
8
24 Vac
7
B
6
5
A
4
3
0 Vac
Min 9Vdc
V
11
A
10
Regulator
9 4...20 mA
Min 9Vdc
V
11
10
A
9
Regulator
4...20 mA
*
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