Levelogger 5 Ranges
Each model of Levelogger is rated for a specific submergence depth (Table 1). The choice of model largely depends on the accuracy of the water level required and the submergence depth. The selection, however, should be based on the maximum anticipated water level fluctuation.
| Model | Submergence Depth | Accuracy |
|---|---|---|
| Barologger | Air only | ± 0.05 kPa |
| M5 | 5 m (16.4 ft.) | ± 0.3 cm (0.010 ft.) |
| M10 | 10 m (32.8 ft.) | ± 0.5 cm (0.016 ft.) |
| M20 | 20 m (65.6 ft.) | ± 1 cm (0.032 ft.) |
| M30 | 30 m (98.4 ft.) | ± 1.5 cm (0.064 ft.) |
| M100 | 100 m (328.1 ft.) | ± 5 cm (0.164 ft.) |
| M200 | 200 m (656.2 ft.) | ± 10 cm (0.328 ft.) |
Table 1 - Levelogger 5 Range
Measurement Fundamentals
Leveloggers (L) measure the total pressure acting on a transducer at their zero point/sensor. The total pressure is caused by the column of water lying above the Levelogger pressure sensor AND the barometric (atmospheric) pressure acting on the water surface. To compensate for barometric pressure fluctuations and get true height of water column measurements (H), a Barologger (B) is required, i.e.:
Levelogger Reading (L)
-
Barologger Reading (B)
=
Height of Water Column (H)
Verifying Readings
The best recommendation is to compare barometrically compensated Levelogger data (H) with a manually measured depth to water level value (d) (using a Water Level Meter).
Tip:
To adjust all readings in your Levelogger file to depth to water below a well casing (d), record a manual water level measurement using a water level meter. This reading should correspond in date and time with an actual Levelogger recording. Use this as a reference datum in the Manual Data Adjustment option in the Levelogger Software Data Wizard.
Note:
The Levelogger 5 can withstand overpressurization of 2 times the intended range, e.g. a Model M10 can accommodate a fluctuation of 20 meters or 60 feet and still record pressure. However, over-range accuracy is not guaranteed.
Barologger 5:
A single Barologger 5 can be used to compensate all Leveloggers on site, within a 20 mile / 30 km radius and with every 1000 ft (300 m) change in elevation. Ensure that your Barologger will start logging within at least 3 hours of your Levelogger start time.
