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HOBO MX Water Level Logger (MX2001-0x) Manual

 

U.S. and International Sales: 1-508-759-9500 11 

www.onsetcomp.com 

Internal Event 
Name Definition 

Safe Shutdown 

The battery level dropped below 1.85 V; 
the logger performs a safe shutdown. 

Setting a Logger Password 

You can create an encrypted password for the logger that is 
required if another device attempts to connect to it. This is 
recommended to ensure that a deployed logger is not 
mistakenly stopped or purposely altered by others. This 
password uses a proprietary encryption algorithm that changes 
with every connection. To set a password: 

1.

 

Tap Devices. Tap the logger tile to connect to the logger. 

2.

 

Tap Lock Logger. 

3.

 

Type a password and then tap Set. 

Only the device used to set the password can then connect to 
the logger without requiring a password; all other devices are 
required to enter the password. For example, if you set the 
password for the logger with your tablet and then try to 
connect to the logger later with your phone, you must enter 
the password on the phone but not with your tablet. Similarly, 
if others attempt to connect to the logger with different 
devices, they are also required to enter the password. To reset 
a password, press the button on the logger or connect to the 
logger and tap Manage Password and tap Reset. 

 

Maintenance 

The logger requires the following periodic maintenance to 
ensure optimal operation: 

 

Protect the logger. This logger can be damaged by shock. 

Always handle the top end and sensor end with care. The 
sensors may lose their calibrated accuracy or can be 
damaged if dropped. Use proper packaging when 
transporting or shipping the logger.

 

Important:

 

Do not attempt to open the sensor end 

housing!

 Unscrewing the nose cone of the sensor end will 

cause serious damage to the pressure sensor and logger 
electronics. There are no user serviceable parts inside the 
sensor end. Contact Onset Technical Support if the sensor 
end requires servicing. 

 

Periodically inspect the logger for biofouling

. Biological 

growth on the face of the pressure sensor will impact the 
pressure sensor’s accuracy. Organisms that grow inside the 
sensor nose cone and on the sensor itself can interfere with 
the sensor’s operation and eventually make the sensor 
unusable. If the deployment area is prone to biofouling, 
check the logger periodically for marine growth. 

 

Be careful of solvents.

 Check a materials-compatibility 

chart against the wetted materials listed in the 
Specifications table before deploying the logger in 

locations where untested solvents are present. The logger 
has Viton and Buna-N O-rings, which are sensitive to polar 
solvents (acetone, ketone), ammonia, chlorine, and brake 
fluids. 

Compensating for Drift 

All pressure sensors drift over time. The drift for the pressure 
sensors and electronics in the logger is less than 0.5% FS (worst 
case) per year. In most applications, drift is not a significant 
source of error because the offset created by any drift is zeroed 
out when you enter the reference water level in the app at the 
beginning of each deployment. In effect, you are re-zeroing the 
sensor each time you apply a reference reading to the data file. 

Pressure sensor drift matters more when absolute pressure 
values are needed, or if there are no recent reference level or 
depth measurements available. For example, if the logger is 
deployed for one year and no new reference level readings are 
taken during the deployment, it is possible that the sensor 
could have drifted as much as 0.5% FS by the end of the 
deployment.  

It is possible to determine the actual amount of drift during a 
deployment if a reference level is taken at the beginning and 
the end of a long-term deployment. The results of applying the 
two different reference levels (once at the beginning of the 
data file and again at the end of the data file) can be compared. 
Any difference between the files indicates the amount of 
sensor drift (assuming accurate reference levels). See 

Reading 

Out the Logger

 for changing the reference water level in the 

data file. 

Verifying Accuracy 

You can check the differential accuracy of the logger for water 
level measurements by deploying the logger’s sensor end at 
two depths and comparing the difference in level readings in 
the data files. When verifying the accuracy this way, be sure to 
allow the sensor’s temperature to stabilize at each depth. 

You can check the absolute pressure accuracy by using the two 
pressure sensors in the logger. Pull up the sensor end that is in 
the water so that both the absolute and differential sensors are 
in the air. Check the differential pressure with the app. The 
differential pressure should be zero or less than the sum of the 
error for the two sensors. 

Battery Information 

The logger requires two user-replaceable AA 1.5 V alkaline 
batteries. Expected battery life varies based on the ambient 
temperature where the logger is deployed, the logging or 
sampling interval, frequency of offloading and connection to 
the mobile device, number of channels that are active, alarm 
duration, use of burst mode or statistics logging, and battery 
performance. New batteries typically last 1 year with logging 
intervals greater than 1 minute. Deployments in extremely cold 
or hot temperatures, a logging interval faster than 1 minute, or 
a sampling interval faster than 15 seconds can impact battery 
life. Estimates are not guaranteed due to uncertainties in initial 
battery conditions and operating environment. 

To install or replace the batteries: 

1.

 

Before changing the batteries, stop the logger and offload 
any data. 

Press this button to reset a 
logger password 

Содержание MX2001-0 Series

Страница 1: ... 0 02 kPa 0 003 psi 0 21 cm 0 007 ft water Pressure Response Time 90 1 second at a stable temperature Pressure Absolute and Water Level Measurements MX2001 02 SS S Operation Range 0 to 400 kPa 0 to 58 psia approximately 0 to 30 6 m 0 to 100 ft of water depth at sea level or 0 to 33 6 m 0 to 111 ft of water at 3 000 m 10 000 ft of altitude Factory Calibrated Range 69 to 400 kPa 10 to 58 psia 0 to 4...

Страница 2: ... 1 C at 25 C 0 18 F at 77 F see Plot A Response Time 90 5 minutes in water typical Stability Drift 0 1 C 0 18 F per year Logger Operating Range 20 to 50 C 4 to 122 F Radio Power 1 mW 0 dBm Transmission Range Approximately 30 5 m 100 ft line of sight Wireless Data Standard Bluetooth Low Energy Bluetooth Smart Logging Rate 1 second to 18 hours Logging Modes Fixed interval multiple intervals with up ...

Страница 3: ... to achieve full temperature compensation of the pressure sensor There can be up to 0 5 of additional error due to rapid temperature changes Measurement accuracy also depends on temperature response time Note Read all the directions in the Deploying a Logger section before deploying the logger Logger Components and Operation Disassembled top end The MX water level logger consists of a top end and ...

Страница 4: ...layed as when the logger is stopped 6 Deploy the logger if ready If you are ready to deploy the logger place it in the deployment location see Deploying the Logger for deployment guidelines Otherwise skip deployment and complete the following steps as a test 7 Connect to the logger Tap the logger tile in the app to connect to the logger Tips for connecting Make sure the top end of the logger is wi...

Страница 5: ...he current water level when the logger starts logging make sure the sensor is in position when logging starts Make this reading as accurate as possible since this reading is used to calibrate the water level data and adjust it to your reference See section 5 starting on page 7 for information on how to measure and enter the reference water level The logger must be logging for you to enter the refe...

Страница 6: ...grommets are available at www onsetcomp com part number GROMMET 5 To install the grommet with the logger 1 Drill two 3 mm or 1 8 inch holes on opposite sides of the well cap for cross ventilation The holes should be just above the top of the grommet when installed as shown 2 Install the grommet with the upper ring sitting on top of the well as shown 3 Install the well cap on top of the well refer ...

Страница 7: ...the top end unit in direct sun as that can lead to more rapid temperature swings which can lead to more measurement error and possibly hurt logger reliability To deploy the logger 1 Make sure the top end is connected to the sensor end with the water level logger cable as described in Getting Started with the Logger 2 Attach any small parts such as bolts with nuts before you go into the field so yo...

Страница 8: ... 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 ...

Страница 9: ... Logger Events for details on plotting and viewing the event Statistics Logging During fixed logging the logger records data for enabled sensors and or selected statistics at the selected logging interval Statistics are calculated at a sampling rate you specify with the results for the sampling period recorded at each logging interval You can log the following statistics for each sensor The maximu...

Страница 10: ...wnloads data to the phone tablet or computer 3 Once the download is complete tap Done to return to the previous page or tap Export and Share to save the file in the specified format 4 When the export file has successfully been created tap Done to return to the previous page or tap Share to use your device s usual modes of sharing You can also upload data automatically to HOBOlink Onset s cloud sof...

Страница 11: ...All pressure sensors drift over time The drift for the pressure sensors and electronics in the logger is less than 0 5 FS worst case per year In most applications drift is not a significant source of error because the offset created by any drift is zeroed out when you enter the reference water level in the app at the beginning of each deployment In effect you are re zeroing the sensor each time yo...

Страница 12: ...rcuit board is normal when the batteries are installed Reinsert the board 6 Inspect the gore vent on the end cap to make sure it is not damaged Contact Onset or an Onset distributor if you need a replacement vent 7 Inspect the O rings and the mating surface on the logger for any damage clean off any debris and re lubricate the O rings with the grease You can leave the O rings on the end cap during...

Страница 13: ...cations not expressly approved by the party responsible for compliance could void the user s authority to operate this equipment Industry Canada Statements This device complies with Industry Canada license exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may...

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