dol sensors DOL 51, Technical User Manual

Page: 7 / 8

Technical User Guide
DOL 51 www.dol-sensors.com 7
Have specialists carry out the annual inspection and sensitivity check.
Replace the dust filter in front of the sensor element, if clogged. A clogged filter prolongs the re-
sponse time of the sensor element. This affects the sensitivity. The dust filter must always be re-
placed prior to checking the sensitivity.
DOL 51 must be removed during cleaning and disinfection.
Do not expose the DOL 51 housing to air in the livestock house without the sensor element mounted, it is how-
ever, okay to replace the element in the livestock house.
Cleaning
Clean the sensor surface with lukewarm water. Check for mechanical damage.
Transport
The sensor must be transported in the original packing in air traffic. Otherwise the sensor may
lose its measuring sensitivity.
9 Technical data
DOL 51, 0-10V, 4-20mA,
0-50ppm NH
3
Specification Parameter Unit
Output Voltage range 0 – 10 VDC
Power range 4 – 20 mA
Load for voltage output > 500 - < 10M Ω
Recommended load, voltage output > 100 kΩ
Load for current output > 100 - < 470 Ω
NH3 Measurement range 0 – 50 ppm NH
3
Voltage resolution 0.2 V/ppm NH
3
Resolution 0.32 mA/ppm
Signal transmission resolution 0.5 ppm NH
3
Accuracy 1.5 ppm or +10% of the
measured value ppm NH
3
Long term drift < +10% of the mea-
sured value %
Time constant: T50 < 30 sec.
Supply voltage 22 – 26 VDC
Supply current < 200 mA
Temperature, operation 0 – +50
o
C
Temperature, storage -20 – +60
o
C
Humidity 15 – 100 %RH
Pressure 700 – 1300 hPa