Internal Battery

Reorder Part Number: A01

Recommended Maintenance Frequency: 36 Months (min.) or As Needed

The NexSens iSIC data logger comes standard with a 12V, 8.5 A-hr rechargeable sealed lead acid (SLA) battery. This battery will need to be replaced every 24-36 months. Any battery older than 36 months should be replaced immediately. This ensures that the battery has maximum charging capacity and will minimize problems with low battery life and unexpected power failures. For short or long-term storage, keep the battery in a cool, dry environment and periodically charge the battery to maintain battery health. See the following link for instructions on replacing the iSIC battery:


Figure 1: NexSens A01 8.5 A-Hr Battery



Reorder Part Number: A71

Recommended Maintenance Frequency: 6 Months (min.) or As Needed

The iSIC Data logger ships with a 5-pack of desiccant bags. When the system is fully installed and working, remove one desiccant bag from the package and place it in the enclosure. Seal the package tightly and store in a very dry location to preserve the remaining packets. The desiccant bag inside the iSIC should be replaced each time that the enclosure is opened or every 6 months at minimum. Data loggers deployed in humid environments may require more frequent replacement and/or installation of multiple desiccant bags inside the enclosure. The package of desiccant bags that comes with the iSIC includes one humidity indicator card that may also be installed inside the iSIC to give an indication of when the desiccant should be replaced. Additional cards can be purchased from a variety of online sources (Amazon, McMaster-Carr, ULine, etc).


Figure 2: Desiccant Bag


Enclosure Vent

Reorder Part Number: A70

Recommended Maintenance Frequency: 12 months

The NexSens iSIC is equipped with an enclosure vent. This vent is made of Gortex material that allows air to pass and keeps moisture out. The enclosure pressure is always at equilibrium with the atmosphere. Be sure to keep this vent free of debris. Replace the enclosure vent, located on the bottom of the iSIC, whenever it becomes dirty and clogged.

Enclosure Vent

Figure 3: Enclosure Vent



Reorder Part Number: A74

Recommended Maintenance Frequency: As Needed

Each iSIC data logger has two fuses labeled “BATTERY” and “EXTERNAL” on the interior mounting plate. The Battery fuse is connected to the A01 iSIC battery, and the External to the MS2 power port on the bottom of the iSIC where a solar panel kit or A11 AC adapter can be connected. These fuses protect the internal circuitry against high current draws from short circuit, faulty wiring and other sources. If the system loses power, check the fuses. If any need to be replaced, investigate the source of the high current draw to ensure that it does not reoccur.


Figure 4: iSIC Fuse


Gland Fittings

Reorder Part Number: A75

Recommended Maintenance Frequency: As Needed

Gland fittings are used to secure sensor cables as they penetrate the iSIC data logger enclosure. A secure seal prevents moisture from entering the enclosure at these points. Properly installed gland fittings should last for several years but should be inspected regularly for degradation, especially if condensation is found inside the enclosure.

Gland Fittings

Figure 5: Gland Fittings


Solar Regulator

Reorder Part Number: SK-6

Recommended Maintenance Frequency: As Needed

The SK-6 solar controller regulates the current and voltage supply from NexSens A21, A22 and A23 solar panel kits that may be used to recharge the A01 iSIC battery. The solar regulator has a 3-year warranty against failure. The SK-6 has an LED that indicates the status. When the LED flashes green, the regulator is typically in good condition. A red LED indicates failure. The regulator can also be tested for functionality by following the instructions at the below link:

Solar Regulator

Figure 6: Solar Regulator


iSIC Enclosure

Reorder Part Number: SA1009

Recommended Maintenance Frequency: As Needed

The iSIC enclosure has a sealing gasket around its perimeter to create a weather-tight seal. Periodically inspect the gasket for damage from weathering or insects, especially if condensation is found inside the enclosure.



REV: 14G31

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