AquaTelemetry Instruction Manual
10401-01193 Rev H
4.2.7. Zeroing the Level Value
When the sonde has been deployed under water, it will log and output the level with respect
to the surface of the water (deployment depth).
If you want the level to read zero at this point so that you can monitor level changes rather
than absolute depth, the sonde can be zeroed.
In order to zero the sonde, send the following message to the AquaTelemetry unit as an
SMS.
ZERO LEVEL or ZE
The AquaTelemetry unit will reply with a confirmation SMS showing:
SITE=XXXXXXXXXXXXXXXX
ZERO REFERENCE LEVELS SET AT HH:MM DD/MMM/YY
DEPTH =X.XXXm
The depth value shown in the SMS is the zero offset depth, i.e. the depth the sonde was
reading prior to zeroing.
If you want to subsequently remove this offset from the readings, take the sonde out of the
water then send it another ZERO LEVEL command. This will restore the sonde to reading
true level (deployment depth) rather than level with an offset.
4.2.8. Clearing the AquaTelemetry Memory
The memory in the AquaTelemetry unit is capable of storing up to 53,000 sets of readings.
At a logging rate of once / hour, this amounts to over six years worth of data. When the
memory becomes full, it will wrap around and start overwriting the oldest data.
Whilst the AquaTelemetry unit will only send data logged since the last upload when it
uploads data by email, if you upload data using the PC utility, it will upload the entire
AquaTelemetry memory, which could be a great deal of data.
The memory should be cleared periodically in order to keep the logged data a manageable
size.
In order to clear the memory, send the following message to the AquaTelemetry unit as an
SMS.
CLEAR MEMORY NOW
To prevent accidental memory clearing, this message will only be accepted if it is sent in full
as shown above.
The AquaTelemetry unit will reply with a confirmation SMS showing:
SITE=XXXXXXXXXXXXXXXX
MEMORY CLEARED
4.3. Setting up the Alert Parameters
The AquaTelemetry unit has four separate level alerts and one rate alert that can be set by
the user.
© 2020 Aquaread
®
Ltd.
www.aquaread.com
Page 23 of 34
