6
Specifications
* Accuracy figures apply to calibration soils and over 0 to 60°C.
Percentages quoted as %vol are % volumetric water content.
7
Care and Safety
Notices
All parts of the SM200 design and documentation are the exclusive property of Delta-T
Devices and covered under international copyright law, © 2005. Patent(s) pending.
The SM200 product is CE compliant, conforming to EN61326:1997.
Delta-T Devices Ltd
128 Low Road
Burwell
Cambridge CB5 0EJ
England (UK)
Tel
:
+44 1638 742922
Fax
:
+44 1638 743155
:
Web
:
www.delta-t.co.uk
The rods of the SM200 are sharp in order to ease insertion. Care must be
taken and handling precautions followed.
Avoid touching the rods or exposing them to other sources of static damage.
Keep the SM200 in its protective tube when not in use.
Take care when attaching cables to ensure that the connectors are clean,
undamaged and properly aligned before pushing the parts together.
Screw together firmly to ensure the connection is water-tight. If the connector
is damaged, apply a light smearing of silicon grease to maintain sealing.
Do not pull the sensor out of the soil by its cable.
If you feel strong resistance when inserting the SM200 into soil, it is likely you
have encountered a stone. Stop pushing and re-insert at a new location.
Range and Notes
Accuracy*
±
3 %vol
0 to 50 %vol
Salinity errors
± 3.5 %vol
0 to 40 %vol, over
50 to 500 mS.m
-1
(0.5 to 5 dS.m
-1
)
Power requirement
5 to 14V
15mA typical
1 second warm-up recommended
200ms minimum
Output signal
0 to 1.0V
Nominal 0 to 60 %vol
Environmental sealing
IP68
Sensor buriable, sealed to IP68
Operating range
-20 to +60°C
Readings in frozen soil are not meaningful
