Using the
s
and
t
keys, bring the parameter shown to the desired value.
Press OK to confirm.
Before starting programming, select the quantity to be displayed with the
TD/TW and UNIT keys; the instrument will use this as the default value. If
there is an interruption in the power supply this value will be displayed when
it starts again.
To change the quantity shown, just press UNIT or TD/TW.
Setting the relay SET points
- Press the SET key, the ON symbol appears on the display and the letter A
to indicate that the value displayed corresponds to the switching-on thre-
shold of relay A.
- To change this value press the
s
and
t
keys.
- Press SET, the OFF symbol appears and the letter A to indicate that the
value displayed corresponds to the switching-off threshold of relay A.
- To change this value press the
s
and
t
keys.
- Press the SET key, the ON symbol appears on the display and the letter B
to indicate that the value displayed corresponds to the switching-on thre-
shold of relay B.
- To change this value press the
s
and
t
keys.
- Press SET, the OFF symbol appears and the letter B to indicate that the
value displayed corresponds to the switching-off threshold of relay B.
- To change this value press the
s
and
t
keys.
- Press SET, the instrument stores the values and returns to normal opera-
tion.
NOTE: While the SET point is being set (ON or OFF symbols lit), the instru-
ment returns to normal operation if no key is pressed for 2 minutes.
Calibration of the humidity sensor
in DO 9861T transmitter
Calibrating the offset of the humidity sensor:
- Insert the probe in the container of the 75.4% relative humidity saturated
solution. Wait at least 30 minutes.
- With the UNIT key select the indication of relative humidity (% RH) on the
display.
- With the TD/TW key select the indication of the dry bulb temperature (TD).
- Press the CAL and UNIT keys together; the message CAL will appear at
the top of the display.
- With the
s
and
t
keys adjust the relative humidity value indicated on the
display to the correct value corresponding to the temperature and satura-
ted humidity of the salt used.
- Wait a few minutes to ensure that the reading is stable.
- Press CAL to confirm this value. The message CAL will disappear.
- Remove the probe from the container and replace the cap of the container
immediately.
Calibrating the slope of the humidity sensor:
- Insert the probe in the container of the 33% relative humidity saturated
solution. Wait at least 30 minutes.
- With the UNIT key select the indication of relative humidity (% RH) on the
display.
- With the TD/TW key select the indication of the dry bulb temperature (TD).
- Press the CAL and UNIT keys together; the message CAL will appear at
the top of the display.
- With the
s
and
t
keys adjust the relative humidity value indicated on the
display to the correct value corresponding to the temperature and satura-
ted humidity of the salt used.
- Wait a few minutes to ensure that the reading is stable.
- Press CAL to confirm this value. The message CAL will disappear.
- Remove the probe from the container and replace the cap of the container
immediately.
NOTE:
1. The point at 75% RH must always be calibrated before the one at 33% RH.
2. If the instrument measures a value higher than 50% RH it calibrates the
offset, if it measures a lower value it calibrates the slope of the sensor.
3. After the replacement of the R.H. sensor, calibration of humidity has
to be carried out by means of the saturated solutions, first at 75%
and then at 33%, as per the following instructions:
- Insert the probe in the container of the 75% R.H. saturated solution.
Wait at least 30 minutes.
- Press the PROG key until the message P14 appears on the display.
- Press CAL and OK keys at the same time.
- With the
s
and
t
keys adjust the relative humidity value indicated
on the display to the correct value of the salt used.
- Press CAL key to confirm.
- Insert the probe in the container of the 33% R.H. saturated solution.
Wait at least 30 minutes.
- With the
s
and
t
keys adjust the relative humidity value indicated
on the display to the correct value of the salt used.
- Press CAL key to confirm. The message CAL disappears, calibra-
tion procedure is finished and now the instrument starts measu-
ring again.
Calibrating the Pt100 temperature sensor
(100
Ω
at 0°C)
- Connect the probe to the instrument. Press the PRG key until the message
P11 appears on the display.
- Press the CAL key twice. The message P11 appears at the bottom of the
display while the temperature is shown at the top.
- Immerse only the Pt100 sensor and a precision thermometer, for referen-
ce, in the zero calibration bath. Wait until the reading has become stable.
- With the
s
and
t
keys adjust the temperature value measured by the Pt100
sensor so that it coincides with the value on the reference thermometer.
- Immerse the Pt100 sensor and the reference thermometer in the full scale
calibration bath. Wait until the reading has become stable.
- With the
s
and
t
keys adjust the temperature value measured by the Pt100
sensor so that it coincides 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
instrument calibrates the probe offset, otherwise it calibrates the gain.
Calibrating the analog output
- Connect a precision milliammeter to analog output 1, for reference.
- Press the PRG key until the message P12 appears on the display. The
message P12 appears at the top of the display while 4.0 appears at the
bottom to indicate calibration at 4 mA.
- With the
s
and
t
keys adjust the value of the output current so as to have
an indication of 4.00 mA on the reference milliammeter.
- Press the CAL key. The message P12 appears at the top of the display
while 20.0 appears at the bottom to indicate calibration at 20 mA.
- With the
s
and
t
keys adjust the value of the output current so as to have
an indication of 20.00 mA on the reference milliammeter.
- Connect a precision milliammeter to analog output 2.
- Press the PRG key until the message P13 appears on the display. The
message P13 appears at the top of the display while 4.0 appears at the
bottom to indicate calibration at 4 mA.
- With the
s
and
t
keys adjust the value of the output current so as to have
an indication of 4.00 mA on the reference milliammeter.
- Press the CAL key. The message P13 appears at the top of the display
while 20.0 appears at the bottom to indicate calibration at 20 mA.
- With the and keys adjust the value of the output current so as to have an
indication of 20.00 mA on the reference milliammeter.
- Press OK to confirm.
Error signals
OFL - Signal which appears during measurement when the value to be
shown is out of scale.
ERR - Signal which appears to indicate that the sensor is faulty or is
disconnected, if referring to the dry bulb temperature or the relative
humidity. If referring to the other parameters, it indicates that it is
impossible to calculate that value (DP, gr/m
3
, gr/kg).
---
- Signal which appears to indicate that the temperature sensor is
faulty or is disconnected.
6
1
2
11
4...20 mA
Min 10Vdc
12
9
10
Power
supply
≈
=
mA
A
A
2
1
V
V
2
1
24 Vac
1
2
11
4...20 mA
Min 10Vdc
12
9
10
≈
=
mA
A
V
A
V
2
2
1
1
