Get to Know Your Data Logger’s Spare Tire: The Lithium Battery
通过 Jacob Davis | 更新： 05/18/2016 | 评论： 2
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When was the last time you checked the air pressure on your automobile’s spare tire? What if you were driving along, got a flat tire, and discovered that your spare tire was flat as well? We don’t often think about our spare tire until we need it, and the same may be true for our data logger’s spare battery. Your Campbell Scientific data logger has a spare battery to protect your data. This backup battery should be periodically checked so you don’t end up stranded in the field without your data.
Since the release of the CR10X, Campbell Scientific data loggers have included an internal lithium backup battery. When the data logger is disconnected from 12 volts main power, the lithium battery maintains the data logger clock and data. When the data logger is reconnected to 12 volts, it seamlessly begins logging data again.
Note: Data loggers such as the CR300, which use flash memory for data storage, do not require a lithium battery for data protection. A lithium battery, however, is still present for maintaining the clock time.
How often is the lithium battery voltage measured by the data logger?
The lithium battery voltage is measured by the data logger once per day, and the value is held in the Status table. The CR300, CR310, and CR200X-series dataloggers are exceptions, as they do not measure this voltage.
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Recommended for You: Review the "Connect Window Tutorial." |
What is normal battery voltage?
Typically, the voltage is extremely stable if the data logger is powered from another source and its temperature is stable. A new internal battery supplies approximately 3.6 Vdc, and it should be replaced when its reading is at or below 2.7 Vdc.
What happens if the lithium battery voltage gets too low?
When the voltage is below 2.7 volts and the main power supply is removed, there is a risk that you could lose data, the program, and the clock setting. When the lithium battery voltage is below approximately 2 volts, your data logger operation may be affected—even with the main power supply connected. Regardless of the reliability of the main power supply, depleted lithium batteries should be replaced.
How long does a lithium battery typically last?
Under ideal conditions, the internal battery in a CR1000 or CR6 datalogger typically lasts three years. Conditions such as the RAM being full or temperature extremes can significantly shorten this time.
Tip: You may be able to lengthen the battery life expectancy past five years by using a continuous connection to a main power supply.
What can I do to ensure the lithium battery is ready when I need it?
The following are some tips to help ensure that you aren’t stranded without your data:
- When you store your data loggers, leave them connected to 12 volts power. If you have a CR6 datalogger, use the Disable Lithium Battery setting.
- Check the lithium battery voltage as a routine part of every site visit you do. (Remember, this is not possible with CR300- and CR200X-series dataloggers because they do not measure this voltage.)
- Replace the batteries on a routine schedule. The frequency of battery replacement depends on the station locations, but five years is common.
- Send your data loggers in for routine calibration. Any lithium battery older than 12 months is replaced as part of the calibration service performed by Campbell Scientific. (Contact our Service Department if you wish to arrange sending in a data logger for calibration.)
How do I replace an internal lithium battery?
Internal lithium batteries are user replaceable. You can find the instructions in the manual for the specific data logger.
How do I know which battery is the right one for my data logger?
Below are some links to help you quickly find which battery you need:
These batteries are standard sizes, and you may be able to purchase one locally. If you choose to purchase your battery from a third-party vendor, be sure to select a high-quality battery for better performance.
If you have any lingering questions about internal batteries, feel free to post a comment below. I checked the lithium battery voltage on my data loggers. Now, I need to go check the air pressure on my spare tire.
关于作者
Jacob Davis is the Director of Client Services and Support at Campbell Scientific, Inc. He works with the worldwide technical support teams. His specialties include serial communications and advanced data logger programming. Jacob has a master’s degree in hydrology and worked with large irrigation projects before coming to Campbell Scientific, Inc.
建议
Schiedeck | 02/25/2019 at 06:14 AM
Ok, but my cable is Prolific PL-2303 XA. How I improved the performance? How I reduce latency time?
JDavis | 02/25/2019 at 09:10 AM
The drivers provided by Prolific do not allow adjusting the latency.
It is recommended to only use cables with FTDI chips for connecting to Campbell Scientific equipment. The cost difference in cables is very small.
NBrown | 02/17/2021 at 08:24 AM
We have a couple older CNC machines that use rs232. The onboard storage is very small so they will request the file in chunks from the host PC. I want to update there computers but with phasing out of serial ports, my best option is a USB to serial adapter. Is this a viable option for machines that require this connection to run for hours at a time?
JDavis | 02/17/2021 at 08:36 AM
For such an application, I would recommend spending extra to buy an industrial rated interface with electrical isolation. For PCs that have card slots, you can purchase RS232 cards. Industrial models are available with electrical protection built in.
chrisbotha | 02/25/2021 at 09:20 AM
I have an issue where my prolific USB to Serial adapter stopped being detected as 'n "Ports (Com & LPT)" device. It keeps on detecting it is a " USB Composite" device, even after installing the correct Windows drivers downloaded directly from the manufacturer's website. Uninstalling it and reinstalling it doesn't help.
I get the same result on another computer also running Windows 10. It simply refuses to recognize the adapter as a USB to Serial device anymore and keeps on detecting it as a "USB Composite" device as soon as you plug it in after uninstalling it and restarting Windows. Windows also claims that it finds no better driver than the one currently installed when doing a driver search, even after installing the manufacturer drivers.
So what do I do? How do I get the adapter to be recognized correctly?
What I don't understand, is that it worked fine, then all of a sudden started to detect it as a workable "USB Composite Device". Any advice, please?
Thank you.
adityamathur | 11/22/2023 at 12:17 PM
Hi,
I'm facing a weird problem with my USB to serial-adapter. The adapter has a Prolific-2303 chipset. The COM port is not getting detected by the Windows 7 laptop.
I've installed the drivers and restarted the computer after installing the drivers.
I've run the driver update from the device manager and updated the drivers.
I also tried to install the COM port manually from the device manager.
I checked the adapter by connecting it to another desktop computer and the COM port is getting detected.
I don't understand why the ports are detected on one computer but not on another.
Please help me identify the problem.
Thank you!
Robin D | 11/22/2023 at 03:22 PM
adityamathur, the blog author asked that I post this response to you:
"That problem sounds like a driver issue. Contact the cable manufacturer for technical support. Years ago, Campbell Scientific switched from Prolific chips to FTDI for better driver support."
shivteck | 07/13/2024 at 10:21 AM
This article is incredibly insightful! It helped me understand the complexities and potential pitfalls of USB-RS232 adapter cables. Thanks for shedding light on these issues.
apple_service | 07/16/2024 at 05:22 AM
This article is incredibly informative! It helped me better understand the issues with USB-RS232 adapter cables and provided practical solutions to troubleshoot them. Thank you for the clear explanations.
shivteck | 07/16/2024 at 06:13 AM
Learning about the common issues with USB to RS-232 adapter cables was incredibly helpful for me. As someone who relies on these adapters for data logging, understanding their limitations and troubleshooting tips is invaluable. Thank you for sharing this informative article
apple_service | 08/24/2024 at 06:57 AM
Understanding the challenges with USB to RS-232 adapter cables was really helpful. This article clarified the issues I've been facing and provided practical solutions that I can apply.
apple_service | 08/24/2024 at 07:10 AM
This blog post is incredibly helpful in understanding the common issues with USB to RS-232 adapter cables. The troubleshooting tips provided will definitely assist in resolving connection problems I’ve encountered
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