RFL100 batteries - RFL100

RFL100 Installation with a Cloud-based Monitoring System
Product status
Document code
M213024EN
Revision
D
ft:locale
en-US
Product
RFL100
Document type
User guide

Main batteries

RFL100 data logger is powered by 2 AA size primary (non-rechargeable) batteries with 1.5 V nominal voltage. Starting the data logger always requires that compatible batteries with sufficient voltage are in place, even if external power is supplied through the service port.

When replacing batteries, always use new batteries, not partially discharged ones. Minimum battery voltage for operation is 2.15 V in series.

Compatible battery types are:

  • 1.5 V alkaline batteries, designation IEC-LR6, ANSI 15A. Standard choice for most humidity and temperature measurement applications.

  • 1.5 V lithium batteries, designation IEC-FR14505 (FR6), ANSI 15-LF. Typically higher capacity and better in cold temperatures.

To ensure sufficient operation time and to allow the monitoring system to reliably send the low battery warning, lithium batteries must be used when the temperature of the data logger's installation location is below 0 °C (+32 °F). Lithium batteries are also required when CO2 measurement is used due to its higher power consumption.

Lithium batteries have a long shelf life, typically 10 years or more. They are also much less likely to leak and damage the data logger.

Do not use batteries with a nominal voltage higher than 1.5 V.
Use of rechargeable batteries is not recommended. RFL100 will not charge batteries even if the service port is connected to a power supply.

Clock battery

RFL100 also has a separate 3 V lithium battery (type CR1/3N button cell) to keep the real-time clock powered when the device is switched off. This battery will not drain in normal use, as long as the data logger is powered by the main batteries or a separate power supply. Since this is also a lithium battery, it is only necessary to change it when it is empty.

If the data logger is turned off for an extended period, the clock battery may be drained and the data logger will lose accurate time. In that case, the data logger will show the low clock battery error code Err 200, and the clock battery must be replaced. The clock of the data logger will be synchronized the next time it connects to an access point.