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VAN WALT
Monitoring your needs
The e-SENSE SMS modem (field modem) and e-SENSE direct do support alarm functionality. When
an SMS modem detects an active alarm status for a sensor, e-SENSE direct can transmit an alarm
message via the SMS modem direct to a mobile telephone number.
The values of alarm and hysteresis must be within the interval constituted by on the one side the
Reference and on the other side by the sum of Reference and Range.
In formula: Ref. <= Alarm <= (Ref. + Range)
The user must always (also when no telemetry is used) fill in the values for alarm high, hysteresis
high, alarm low and hysteresis low.
The integrator function can be used to determine daily, weekly or monthly totals on the basis of
rain intensity measurements. If it is necessary to start obtaining measurement totals, the starting
value of the integrator can be set at zero, which can be done by adjusting the datalogger's
Master setting to the value '-0'. This is called the 'resetting' of the integrator. In this way, the rain
intensity measurements can be used to determine daily, weekly or monthly totals on the basis of
daily measurement samples.
5.
Applications
The following e+ sensors are currently available:
• Rain fall (intensity and total)
• Soil moisture (volume fraction, conductivity and temperature)
In due course e+ sensors will also be available for the following areas of application:
-Wind (direction and speed)
-Atmospheric conditions (moisture and temperature)
-Atmospheric pressure
-Temperature
-Radiation (pyrano and albedo)
-Flumes (flow rate)
-Infiltration
The following Divers are currently available for the following applications:
-Diver (water level and temperature)
-BaroDiver (atmospheric pressure and temperature)
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. 01428 661 660 | Fax. 01428 656 808 | www.vanwalt.com
Operating Instructions
Rain Gauge
and Ref <= Hysteresis <= (Ref. + Range)
-Soil erosion
-Evaporation
-Tension
-Pulse
-Current
-Conductivity
-Serial
-CTD-Diver (water level, temperature and
-OTD-Diver (water level, temperature and
conductivity)
dissolved oxygen)
17
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