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Update on Moore Industries Battery Lifing Comparison on its THZ and BULLET WirelessHART Adapter

Update on Moore Industries Battery Lifing Comparison on its THZ and BULLET WirelessHART Adapter

On June 13, 2014, Moore Industries began a battery lifing comparison pairing up the BULLETWirelessHART Adapter and the THZ Dual Head Smart HART Temperature Transmitter. The purpose of the test was to identify how much longer battery life could be conserved if a THZ was configured only to turn on when a measurement was required versus keeping the transmitter on non-stop. The test was set-up with a THZ Dual Head Temperature Transmitter powered by a Moore Industries custom designed battery pack that consists of four off-the-shelf Type-D 3.6V Lithium Thionyl Chloride batteries (BB1) connected to a BULLET, which was configured to transmit data every 10 minutes. At each transmission interval the BULLET turns on the THZ for a 12 second duration, which allows a temperature measurement to be taken and read via HART by the BULLET. The second test setup consisted of the same THZ temperature transmitter, battery pack (BB2), and BULLET WirelessHART adapter.  This setup differs in that power is applied continuously to the THZ and BULLET.  

When the BULLET wakes and powers on the THZ in the first setup, it draws 4mA for 12 seconds every 10 minutes. In the second test setup the THZ draws 4mA continuously. In both setups, The BULLET continuously consumes 500µA and up to an additional and momentary 25mA when it transmits every 10 minutes. Using the battery manufacturer’s specifications, Moore Industries calculated battery life lasting approximately 3.7 years under perfect test conditions (BB1) and 175 days under a constant demand state (BB2).

As of this publication on June 17, 2016 (just over two years from kick-off of the test), battery BB1 is still operating.

Battery BB2 stopped operating 198 days after initiation of the test, exceeding the 175 days calculated for a battery under constant current draw by 23 days.

Based on test results thus far, connecting a BULLET to a THZ (or other smart HART field devices, non-smart analog field devices or remote HART I/O from any supplier) and configuring it to turn on only when necessary for a measurement to be taken will significantly extend battery life and reduce battery replacement intervals for your application.

Stay tuned for periodic updates to this test.

Published: June 13, 2016
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