3 SDL550-EU-EN V1.4 3/14
1
6
4
5
3
22
7
Humidity Probe Description
1. Probe Handle
2. Probe connecting cable
3. Probe-to-meter input plug
4. Probe collar
(probe sensor unscrews from here to access filter)
5. Moisture Sensor penetrating tip
6. Sensor port openings
7. Protective cap
(slides off of sensor tip)
Basic Operation
Power ON-OFF
Power the meter by pressing and holding the power button
for at least 1.5 seconds.
Press and hold the power button for at least 1.5 seconds to power OFF the meter.
This meter is powered by six (6) 1.5VDC ‘AA’ batteries or by optional AC adaptor.
Display Backlight
To turn the display backlight ON or OFF, press and hold the backlight
button for at least 1.5
seconds. The meter will beep when switching the backlight ON or OFF unless the beeper is
disabled.
Humidity Content Sensor
The supplied Humidity Content sensor connects to the meter via the DIN jack at the top right of the
meter. Note that the utility end of the sensor is located beneath the protective cap; use great caution
when removing the cap and when handling the sensor as the sensor head is extremely sharp. The
sensor uses an internal filter and when the filter becomes soiled or defective the readings take
longer to stabilize. Contact Extech for replacement filters.
Temperature (Thermocouple) Sensor
A type J or K thermocouple (optional) can be connected to the meter via the thermocouple input
jack at the top left of the meter for measuring air temperature. Note that the temperature range of
the meter extends up to 1300
°
C (2372
°
F), however thermocouple ranges vary greatly; be sure to
select a thermocouple rated for the expected temperature measurement ranges.
