For applications from CSO monitoring to well drawdown tests, liquid level data loggers have proven valuable. In recent years, several low-cost versions have emerged, designed to enable more cost-effective monitoring. However, these devices have technological shortcomings that limit their lifespan and increase overall system cost.
Traditionally, low-cost level loggers were powered by internal lithium batteries with lifespan potentially limited to five years, depending upon the logging rate. Once the battery is depleted, most of the devices are rendered ineffective because the battery is not replaceable. Although some are powered from the surface after the battery’s expiration, the application versatility is significantly limited.
Additionally, older rechargeable battery technologies are not suitable for use in devices requiring long-term deployment, as older rechargeable batteries slowly self-discharge even when a device is not drawing power.
Power Cells Without Limitations
New technologies promise to alleviate these shortcomings and make the devices more attractive. Accumulator power cells — a new rechargeable technology — are now used to make low-cost data loggers with indefinite lifespans. These new accumulator power cells do not self-discharge.
The power cell is charged via USB connection during data retrieval at a rate of 100 mAh. An AC power adapter also is provided to facilitate faster charging of the power cell at a rate of 800 mAh. With a fully charged battery, the device can operate up to three years, depending upon logging rates.
Autonomous Data Collection With Rechargeable Appeal
The DCX-ECO by Keller uses accumulator power cell technology to provide a rechargeable autonomous liquid level logger. It is also available in absolute, sealed and vented versions. The vented gauge format uses a vent tube integral to the signal cable, allowing the device to compensate for changes in atmospheric pressure in real time. This negates the need for a data logging barometer, which is necessary for reporting accurate data compensating for changes in atmospheric pressure when using an absolute level logger. The sealed and vented versions also allow for communication with the device without removing it from the water.
Keller America specializes in pressure measurement solutions, offering a complete line of pressure transmitters, gauges and loggers. For more information on how the DCX-ECO can provide accurate and reliable data logging:
877-253-5537 | sales@kelleramerica.com | www.kelleramerica.com
