Wohler IR Hygrotemp 24 User manual

Wöhler IR Hygrotemp 24
The Measure of Technology
Contents
1. Specification..............................19
2. Operation...................................21
3. Parameter Setting......................24
4. Battery.......................................25
6. Troubleshooting......................... 26
7. Calibration .................................27
8. Tables: Emisivity ........................28
9. Information on disposal............. 30
10. Declaration of Conformity .........30
11. Guarantee and Service.............. 31
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19
Wöhler IR Hygrotemp 24
ENGLISH
1. Specification
1. Specification
1.1 Important Information
Carefully study and observe all items of these operating instruc-
tions before commissioning the unit.
In principle, the Wöhler IR Hygrotemp 24 should only be used by
skilled personnel for its intended purpose and within the speci-
fied range of data. Any liability or warranty for results established
or for defects caused when using the unit is excluded by all
means
1.2 Aplication
The IR Hygrotemp 24 is a handy, handheld instrument designed to provide a
variety of critical atmospheric measurements for Indoor Air Quality. It mea-
sures humidity, air temperature, dew point, wet bulb, surface temperature
and differential temperature. It has a bright, backlit display screen that shows
three different values at one time. It is also provided with a laser pointer for
precision targeting and a RS232 interface for data transfer to a PC.
1.3 Technical Data:
Air Temperature:
Temperature range: -20 to +50 °C (-4 to122 °F )
Accuracy: ±0.6 °C (+/- 1 °F)
Resolution: 0.1°C
IR temperature):
R temperature range: -40 to 500 °C (-40 to 932 °F)
Accuracy: ±2 % or ±2 °C (at -20 to 450 °C),
others: ± 3 % or ± 3 °C
Resolution: 0.1 °C
Relative Humidity:
RH range: 0 to 100 %
Accuracy: ±3 % at 10 to 90 % rh., others: ±5 %
Resolution: 0.1%
Calculated Values:
!
!

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Wöhler IR Hygrotemp 24
Dew point:
Dew point range: -68 to 49.9 °C (-90.4 to 122 °F)
Resolution: 0.1°C
Wet bulb range:
Wet bulb range: -21.6 to 49.9 °C (- 69 to 122 °F)
Resolution: 0.1°C
Emissivity: 0.30...0.99 continuously adjustable
Response time: 500 msec. (IR sensing)
Size: 175 x 50 x 70 mm
Working temperature: 0 °C to + 50 °C, 32 °F to 122 °F
Power: 4 x 1. 5 V AAA battery or 9V
Endurance: aprox. 50 hours
Display: triple LCD digital display, with aditional backlight
function
1. Specification
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22
Wöhler IR Hygrotemp 24
The keys have the following functions:
MEASIRv- Key
-Press to measure surface temperature by activating IR function.
-Release to hold the surface temperature value.
- Press MEASIR and LASER at the same time to inactivate or activate targe-
ting function.
SET-Key
- Press to turn on the meter without IR value displayed.
- Press at least 2 seconds to turn off the meter.
- While the meter is on, press again to enter auto-off time setting and emis-
sivity setting.
BKLT-Key (Back light)
- Press to turn on the back light.
- Press again to turn off the back light.
DP/WB-Key
-Press to select the operation mode from air temperature, dew point to wet
bulb.
-Press for 2 seconds to show T1-dew point (T1 = surface temperature).
°C/°F-Key
-Press to change temperature unit.
-Press for up when setting the auto-off time and emissivity.
-Press SET and °C/°F at the same time to disable auto power off function.
Laser-Key
-Press MEASIR and LASER at the same time when the instrument is swit-
ched off to inactivate laser targeting function or activate targeting func-
tion.
- Press for down while setting the auto-off time and emissivity.
2. Operation

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Wöhler IR Hygrotemp 24
ENGLISH
2.3. Measuring
-Press to retract the sensor before operation.
-Turn the meter on by pressing SET.
-You also can turn on the meter by pressing MEASIR if you want to measu-
re the IR temperature. In that case the Laser will be deactivated for secu-
rity reasons. Press LASER to activate this function.
2.3.1. IR Surface Measurement
-Press MEASIR to start IR surface measuring. While IR is working the
Symbol will appear on LCD, when the laser is activated.
- Press MEASIR and LASER at the same time to inactivate the laser targe-
ting. Press above keys again to activate laser targeting. When the laser is
activated, the measuring point can be determined.
2.3.2 Air temperature, Dew point and Wet bulb
- Press DP/WB to show the Dew Point (DP) on the LCD. Press again to
show the Wet bulb (WB) on the LCD. Press again to show the air tempe-
rature on the LCD again.
2.3.3 Dew Point Range Measurement
-Press the DP/WB-key to show the Dew Point on the LCD ( )
The corresponding value shown in the display refers to the measuring
point T1. The value shows the difference between the surface tempe-
rature, which was last measured, and the dew point temperature. If this
value is less than 4 °C, there may appear condensation water or fog, so
that there existis the danger of mold fungus on the surface.

¤
2. Operation
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Wöhler IR Hygrotemp 24
3. Parameter Setting
600 s
Figure 3.1: Setting Auto-off-time
Figure 3.3: Emissivity setting
0.95
E
Figure 3.2: Non-Sleep-Mode n
3. Parameter Setting
3.1 Auto-Off-time setting
The unit will turn itself off after 5 minutes. The auto power off time frame is
adjustable from 5 to 600 seconds. While the meter is on, press the SET-key
to enter setting procedure. Pressing °C/°F-key for up and LASER for down.
Press SET again to save parameters and enter emissivity setting.
To override auto power off function, press SET and °C/°F-key. When „n“
appears, release keys and the unit now is in Non-Sleep-Mode (Fig. 3.2)
3.2 Emissivity setting
The emissivity (figure 5) is adjustable from 0.3 to 0.99. Press SET twice to
enter setting procedure while the meter is on. E will flash on the left side.
Pressing °C/°F-key for up and LASER-key for down. Press SET again to
save parameter and back to normal.

25
Wöhler IR Hygrotemp 24
ENGLISH
4. Battery
Figure 4.4: Battery
- 888.8°C
- 188.8°F
Humi 88.8%
4. Battery
The battery symbol will appear on display at the left bottom corner when the
power is low. Failure to replace batteries will have an effect on the accuracy
of the readings.
To change the batteries:
1. Open the battery cover on the rear side.
2. Remove the expired batteries.
3. Insert new 4 pieces of AAA batteries and make sure the batteries are in-
serted with correct polarity.
4. Put on the cover.
If you have not used the meter for a certain time, you should change the
batteries.
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Wöhler IR Hygrotemp 24
5. Troubleshooting
Power on but no display.
-Make sure the time of pressing SET is more than 0.1 second.
-Check the batteries are in place and in good contact with correct polarity.
-Replace a new battery and try again.
Dislay disappears
- Check whether the low battery indicator is displayed, before the display
disappears. If yes, replace a new battery.
-Turn on the meter by pressing SET and °C/°F-key to disable auto power
off function for long time using.
Top display E1
-Circuit error in IR measurement channel. Return to dealer for repairing.
-Circuit error in temperature measurement channel. Return to dealer for
repairing.
(If Dew Point symbol is displayed).
Top Display E2
- IR temperature > 500 °C.
- IR temperature < 500 °C while room temperature > 50 °C
(If Dew Point symbol is displayed).
Top temperature E3
-IR temperature < -40 °C.
- IR temperature > -40 °C while room temperature < -20 °C
(If Dew Point symbol is displayed).
Middle display E2
- The Dew Point is out of range (>50 °C).
- If E2 always appears in the display, while the air temperature is between
-20 to 50 °C , it means that there is a circuit error in the temperature mea-
surement channel. Return the meter to dealer for repairing.
Middle display E3
- Room temperature is out of the range (< -20 °C).
- If E3 always appears in the display, while the temperature range is bet-
ween -20 to 50 °C, it means that there is a circuit error in the temperature
measurement channel. Return the meter to dealer for repairing.
5. Troubleshooting

27
Wöhler IR Hygrotemp 24
ENGLISH
Bottom display E1
- Circuit error in relative humidity measurement channel. Return to dealer
for repairing.
Bottom display E5
-Circuit error in relative humidity measurement channel. Return to dealer
for repairing.
6. Calibration
Send the Wöhler IR Hygrotemp regularily to the factory for calibration, depen-
ding on the frequency of use.
5. Troubleshooting
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