HOBO MX Water Level Logger (MX2001-0x) Manual
U.S. and International Sales: 1-508-759-9500 8
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•
If the water level surface is below the reference point as
shown below, enter the reference water level in the app
as a negative number.
•
If the water level surface is above the reference point as
shown below, enter the reference water level in the app
as a positive number.
•
If you are using the sensor as the reference point as
shown below, enter the reference water level in the app
as zero and start the logger before the sensor is in the
water. The logged water level readings will represent the
height above the sensor.
Setting up Alarms
You can set an alarm to trip when a sensor reading rises above
or falls below a specified value. Alarms alert you to problems so
you can take corrective action. To set an alarm:
1.
Tap Devices. Tap the logger tile in the app to connect to the
logger and tap Configure & Start.
2.
Tap the Differential Pressure sensor to set a differential
pressure alarm. Tap the Temperature sensor to set a
temperature alarm. You cannot configure alarms for
absolute pressure or water level. Note: Set the Logging
Mode to Fixed to set any alarm. Alarms work only in Fixed
mode.
3.
Select High if you want an alarm to trip when the sensor
reading rises above the high alarm value. Enter a value to
set the high alarm value.
4.
Select Low if you want an alarm to trip when the sensor
reading falls below the low alarm value. Enter a value to set
the low alarm value.
5.
For the Duration, select how much time should elapse
before the alarm trips and select one of the following:
•
Cumulative. The alarm trips once the sensor reading
is out of the acceptable range for the selected
duration any time during logging. For example, if the
high alarm is set to 85°F and the duration is set to 30
minutes, then the alarm will trip once the sensor
readings have been above 85°F for a total of 30
minutes since the logger was configured.
•
Consecutive. The alarm trips once the sensor reading
is out of the acceptable range continuously for the
selected duration. For example, the high alarm is set
to 85°F and the duration is set to 30 minutes, then
the alarm will only trip if all sensor readings are 85°F
or above for a continuous 30-minute period.
6.
Repeat steps 3–7 for the other sensor.
7.
Enable the Sensor in Limits alarm option. This indicates the
alarm icon remains visible in the app until the sensor
reading returns to the normal range between any
configured high and low alarm limits.
Notes:
•
The actual values for the high and low alarm limits are set
to the closest value supported by the logger. In addition,
alarms can trip or clear when the sensor reading is within
the resolution specifications. This means the value that
triggers the alarm may differ slightly than the value
entered.
•
The alarm icon appears in the app next to the logger
name or serial number when the alarm trips if the device
is within range of the logger.
•
Once an alarm condition clears, the alarm icon in the app
is no longer displayed. There is no option to keep the
alarm icon visible until the logger is reconfigured.
•
When you download data from the logger, alarm events
can be displayed on the plot or in the data file. See
Logger Events
.
Burst Logging
Burst logging is a logging mode that allows you to set up more
frequent logging when a specified condition is met. For
example, a logger is recording data at a 5-minute logging
interval. You can configure burst logging to log every 30
seconds when the water temperature rises above 85°F (the
high limit) or falls below 32°F (the low limit). This means the
logger records data every 5 minutes as long as the water
temperature remains between 85°F and 32°F. Once the water
