User Manual

Global Water Instrumentation
14
converting water level to flow , or can be used as best-fit polynom ial approximat ions
for almost any non-linear sensor or function. These feat ur es are available in both
databases, but they work diff er ently and the format won’t be detailed here.
Alarms
Alarm notifications can be sent via email or text messaging w hen inc oming data
exceeds thr es holds defined in the alarms sec tion of the dat abas es . Both high and
low threshold settings are available f or all analog input s to alert the user based on
water level, wind s peed or any other analog parameter . Digital inputs can generat e
alarm messages bas ed on the state of t hes e inputs, a door being opene d or a power
failure for ex am ple.
Besides tr ans m itting data at regular intervals, t he SIT65 can be programmed to
transmit upon any change of st ate on any of the digital stat us or ac c umulator inputs.
These alarm transmissions occur with all changes of state. A door switch for
example will cause an event trans mission every time the door opens and closes.
The alarm t hr es holds can be conf igur ed to send email and text message notification
on just a single state, like the door being opened, but the trans mission will occur
every tim e the door is both opened and closed. In cases wher e the state changes
often, m any extr a trans missions will be sent. In some cases, this c an be enough
data to af fect the subscription fees.
Installation
The antenna is a 1 m eter whip antenna with no alignm ent required; ho w ev er , an
open view of the s k y is. Anything blocking the view of the s k y can lim it or totally
prevent com m unic ation with the satellite network. Trees, buildings, ov erhangs, and
canyon walls are some ex amples of obstr uc tions that will limit performance. If only a
partial view of the open sky is available, latency times m ay incr eas e but
communication can still be possible. Sat ellites are constantly passing overhead and
eventually one will come into view in ev en a s mall open space. However, t his c an
dramatically inc r eas e the latency time and if the satellite goes by too quickly, ther e
may not always be enough time to trans m it the data, res ulting in gaps in data. The
widest possible v iew of the sky will always produce the best results.
The SIT65 is pr ov ided with the necessar y har dwar e for mounting the enclosure and
antenna to a wall or on a 2” pipe. For best perform anc e, the antenna should be