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is shown at the bottom of the display.
- When pressed along with the CAL key it activates the humidity sensor
calibration function.
OK
Confirms the programming parameters, or the relay SET values, and
stores them.
CAL - When pressed along with the UNIT key it activates the humidity sensor
calibration function.
- Key used to confirm the calibration of the humidity sensor.
- Key used to increase the value displayed during programming of the
▲
parameters.
- During programming of the relay SET points.
- During calibration.
- Key used to decrease the value displayed during programming of the
▼
parameters.
- During programming of the relay SET points.
- During calibration.
Display
Symbol description
TD
indicates that the value shown is the dry bulb temperature in °C.
TW
indicates that the value shown is the wet bulb temperature in °C.
DP
indicates that the value shown is the dew point temperature in °C.
% RH indicates that the value shown is the relative humidity.
gr/m3 indicates that the value shown is the absolute humidity (gr per m3 of air).
gr/kg indicates that the value shown is the mixing ratio (gr per kg of dry air).
A
indicates that relay A is ON.
B
indicates that relay B is ON.
ON
indicates that the value shown corresponds to the closing threshold of the
contacts of relay A or B.
OFF indicates that the value shown corresponds to the closing threshold of the
contacts of relay A or B.
Programming the parameters
It is possible to select the corresponding quantities:
- Dry bulb temperature (TD °C)
- Wet bulb temperature (TW °C)
- Dew point temperature (DP °C)
- Relative humidity (% RH)
- Absolute humidity (a gr/m3)
- Mixing ratio (x gr/kg).
The range that may be set for each quantity is:
- Dry bulb, wet bulb and dew point temperature: -60.0...+100.0°C
- Relative humidity: 0.0...100.0% RH
- Absolute humidity: 0.0...1999 gr/m3
- Mixing ratio: 0.0...1999 gr/kg.
Parameters for the DO 9861T
P1
Physical quantity on which depends the operation of the analog output 1
(TD, TW, DP, % RH, gr/m3, gr/kg).
P2
Physical quantity on which depends the operation of the analog output 2
(TD, TW, DP, % RH, gr/m3, gr/kg).
P3
Value corresponding to 4 mA at analog output 1.
P4
Value corresponding to 20 mA at analog output 1.
P5
Value corresponding to 4 mA at analog output 2.
P6
Value corresponding to 20 mA at analog output 2. P7 Physical quantity on
which depends the operation of relay A (TD, TW, DP, % RH, gr/m3, gr/kg).
P8
Physical quantity on which depends the operation of relay B (TD, TW, DP,
% RH, gr/m3, gr/kg).
P9
Delay time in intervention of relay A. May be set between 0 and 255
seconds both during the opening and the closing.
P10
Delay time in intervention of relay B. May be set between 0 and 255
seconds both during the opening and the closing.
P11
Calibration of Pt100 probe.
P12
Current calibration of output 1 at 4 mA and 20 mA.
P13
Current calibration of output 2 at 4 mA and 20 mA.
P14
R.H. calibration after the replacement of R.H. sensor.
To alter one of the parameters, press the PRG key until the message
corresponding to the parameter that is to be changed appears on the display.
Using the and 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 threshold of
relay A.
- To change this value press the and 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 and 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 threshold of
relay B.
- To change this value press the and 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 and keys.
- Press SET, the instrument stores the values and returns to normal operation.
NOTE: While the SET point is being set (ON or OFF symbols lit), the instrument
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 and keys adjust the relative humidity value indicated on the
display to the correct value corresponding to the temperature and saturated
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 and keys adjust the relative humidity value indicated on the
display to the correct value corresponding to the temperature and saturated
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 and 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 and 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, calibration
procedure is finished and now the instrument starts measuring 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 reference, in
the zero calibration bath. Wait until the reading has become stable.
UR-18
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