User manual

Product information20
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10. Note: If you do not wish to use either of the two holes in the bottom of the
EL029 case, make a hole in the side of the case just big enough for the leads to
pass through. Take care not to damage the electrical components.
11. Leaving enough free wire to make the connection, secure the leads by looping
them around the central boss of the EL029 case. Alternatively, put a 'tie wrap'
around the leads inside the case and near the hole. Make sure that the leads are
securely held in the EL029.
12. Push the bare ends of the leads into the holes in the back of the terminal block.
There should be one lead in each hole.
13. Tighten the screws in the terminal block and check that the leads are held firmly
in place. Do not overtighten the screws.
14. Put the lid back on to the EL029. Make sure it is on the right way round.
15. Tighten the fixing screw being careful not to overtighten it.
16. Check the operation of the external switch. Connect up the EL029 and make
sure that PicoScope or PicoLog shows near to 100% when your external switch is
open and 0% when it is closed.
3.6.5
DD101 Humidity Sensor
DD101 Humidity Sensor measures humidity using a 'non-condensing' technique. It
has a short response time and plugs into the external sensor connections of USB
DrDAQ.
Size
72 x 45 x 28 mm
Operating range
20% - 90% Relative Humidity
Overall accuracy
Reading ± 10%
Operating temperature
0 - 60 °C
Resolution
0.2% Relative Humidity
Minimum response time
60 seconds with vigorous air movement
Maximum response time
60 minutes in still air
Caution: Do not allow the DD101 sensor to become wet. The DD101 is a non-
condensing sensor and liquid entering the case (including condensation) may damage
it.
The DD101 may be connected to either Ext 1, Ext 2 or Ext 3 on USB DrDAQ.
Tips for use of DD101 Humidity Sensors
The sensor responds to humidity changes more slowly in still air. If you need to
increase the response time, then increase the air flow around the sensor. For
example, swing the sensor gently on its lead or create a constant draft using a fan.
Do not blow into the sensor, as your breath is very humid and will produce incorrect
results. Never allow the sensor to get wet; for example, do not take a cold sensor into
a warm humid environment where condensation may form inside the sensor's case.